Bag of holding updates

vendor/json/test/CMakeLists.txt

@@ -0,0 +1,199 @@
+option(JSON_Sanitizer "Build test suite with Clang sanitizer" OFF)
+option(JSON_Valgrind "Execute test suite with Valgrind" OFF)
+option(JSON_NoExceptions "Build test suite without exceptions" OFF)
+option(JSON_Coverage "Build test suite with coverage information" OFF)
+
+# download test data
+include(${CMAKE_CURRENT_SOURCE_DIR}/../cmake/download_test_data.cmake)
+
+# test fixture to download test data
+add_test(NAME "download_test_data" COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target download_test_data)
+set_tests_properties(download_test_data PROPERTIES FIXTURES_SETUP TEST_DATA)
+
+if(JSON_Sanitizer)
+    message(STATUS "Building test suite with Clang sanitizer")
+    if(NOT MSVC)
+        set(CMAKE_CXX_FLAGS "-g -O0 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fsanitize-recover=unsigned-integer-overflow")
+    endif()
+endif()
+
+if(JSON_Valgrind)
+    find_program(CMAKE_MEMORYCHECK_COMMAND valgrind)
+    message(STATUS "Executing test suite with Valgrind (${CMAKE_MEMORYCHECK_COMMAND})")
+    set(memcheck_command "${CMAKE_MEMORYCHECK_COMMAND} ${CMAKE_MEMORYCHECK_COMMAND_OPTIONS} --error-exitcode=1 --leak-check=full")
+    separate_arguments(memcheck_command)
+endif()
+
+if(JSON_NoExceptions)
+    message(STATUS "Building test suite without exceptions")
+    if(NOT MSVC)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DJSON_NOEXCEPTION")
+    endif()
+    set(DOCTEST_TEST_FILTER --no-throw)
+endif()
+
+if(JSON_Coverage)
+    message(STATUS "Building test suite with coverage information")
+
+    # from https://github.com/RWTH-HPC/CMake-codecov/blob/master/cmake/FindGcov.cmake
+    get_filename_component(COMPILER_PATH "${CMAKE_CXX_COMPILER}" PATH)
+    string(REGEX MATCH "^[0-9]+" GCC_VERSION "${CMAKE_CXX_COMPILER_VERSION}")
+    find_program(GCOV_BIN NAMES gcov-${GCC_VERSION} gcov HINTS ${COMPILER_PATH})
+
+    # collect all source files from the chosen include dir
+    file(GLOB_RECURSE SOURCE_FILES ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}*.hpp)
+
+    # add target to collect coverage information and generate HTML file
+    # (filter script from https://stackoverflow.com/a/43726240/266378)
+    add_custom_target(lcov_html
+        COMMAND lcov --directory . --capture --output-file json.info --rc lcov_branch_coverage=1
+        COMMAND lcov -e json.info ${SOURCE_FILES} --output-file json.info.filtered --gcov-tool ${GCOV_BIN} --rc lcov_branch_coverage=1
+        COMMAND ${CMAKE_SOURCE_DIR}/test/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
+        COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
+        COMMENT "Generating HTML report test/html/index.html"
+    )
+endif()
+
+#############################################################################
+# doctest library with the main function to speed up build
+#############################################################################
+
+add_library(doctest_main OBJECT src/unit.cpp)
+set_target_properties(doctest_main PROPERTIES
+    COMPILE_DEFINITIONS "$<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>"
+    COMPILE_OPTIONS "$<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>"
+)
+if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
+    target_compile_features(doctest_main PUBLIC cxx_range_for)
+else()
+    target_compile_features(doctest_main PUBLIC cxx_std_11)
+endif()
+target_include_directories(doctest_main PRIVATE "thirdparty/doctest")
+
+# https://stackoverflow.com/questions/2368811/how-to-set-warning-level-in-cmake
+if(MSVC)
+    # Force to always compile with W4
+    if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
+        string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    else()
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
+    endif()
+
+	# Disable warning C4566: character represented by universal-character-name '\uFF01' cannot be represented in the current code page (1252)
+	# Disable warning C4996: 'nlohmann::basic_json<std::map,std::vector,std::string,bool,int64_t,uint64_t,double,std::allocator,nlohmann::adl_serializer>::operator <<': was declared deprecated
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4566 /wd4996")
+
+	# https://github.com/nlohmann/json/issues/1114
+	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /bigobj")
+endif()
+
+#############################################################################
+# one executable for each unit test file
+#############################################################################
+
+set(files
+    src/unit-algorithms.cpp
+    src/unit-allocator.cpp
+    src/unit-alt-string.cpp
+    src/unit-assert_macro.cpp
+    src/unit-bson.cpp
+    src/unit-capacity.cpp
+    src/unit-cbor.cpp
+    src/unit-class_const_iterator.cpp
+    src/unit-class_iterator.cpp
+    src/unit-class_lexer.cpp
+    src/unit-class_parser.cpp
+    src/unit-comparison.cpp
+    src/unit-concepts.cpp
+    src/unit-constructor1.cpp
+    src/unit-constructor2.cpp
+    src/unit-convenience.cpp
+    src/unit-conversions.cpp
+    src/unit-deserialization.cpp
+    src/unit-diagnostics.cpp
+    src/unit-element_access1.cpp
+    src/unit-element_access2.cpp
+    src/unit-hash.cpp
+    src/unit-inspection.cpp
+    src/unit-items.cpp
+    src/unit-iterators1.cpp
+    src/unit-iterators2.cpp
+    src/unit-json_patch.cpp
+    src/unit-json_pointer.cpp
+    src/unit-large_json.cpp
+    src/unit-merge_patch.cpp
+    src/unit-meta.cpp
+    src/unit-modifiers.cpp
+    src/unit-msgpack.cpp
+    src/unit-noexcept.cpp
+    src/unit-ordered_json.cpp
+    src/unit-ordered_map.cpp
+    src/unit-pointer_access.cpp
+    src/unit-readme.cpp
+    src/unit-reference_access.cpp
+    src/unit-regression1.cpp
+    src/unit-regression2.cpp
+    src/unit-serialization.cpp
+    src/unit-testsuites.cpp
+    src/unit-to_chars.cpp
+    src/unit-ubjson.cpp
+    src/unit-udt.cpp
+    src/unit-udt_macro.cpp
+    src/unit-unicode.cpp
+    src/unit-user_defined_input.cpp
+    src/unit-wstring.cpp)
+
+foreach(file ${files})
+    get_filename_component(file_basename ${file} NAME_WE)
+    string(REGEX REPLACE "unit-([^$]+)" "test-\\1" testcase ${file_basename})
+
+    add_executable(${testcase} $<TARGET_OBJECTS:doctest_main> ${file})
+    target_compile_definitions(${testcase} PRIVATE DOCTEST_CONFIG_SUPER_FAST_ASSERTS)
+    target_compile_options(${testcase} PRIVATE
+        $<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>
+        $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-deprecated;-Wno-float-equal>
+        $<$<CXX_COMPILER_ID:GNU>:-Wno-deprecated-declarations>
+    )
+    target_include_directories(${testcase} PRIVATE ${CMAKE_BINARY_DIR}/include thirdparty/doctest thirdparty/fifo_map)
+    target_link_libraries(${testcase} PRIVATE ${NLOHMANN_JSON_TARGET_NAME})
+
+    if (JSON_Coverage)
+        target_compile_options(${testcase} PRIVATE --coverage)
+        target_link_libraries(${testcase} PRIVATE --coverage)
+    endif()
+
+    add_test(NAME "${testcase}"
+        COMMAND ${testcase} ${DOCTEST_TEST_FILTER} --no-skip
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    )
+    set_tests_properties("${testcase}" PROPERTIES LABELS "all" FIXTURES_REQUIRED TEST_DATA)
+
+    if(JSON_Valgrind)
+        add_test(NAME "${testcase}_valgrind"
+            COMMAND ${memcheck_command} ${CMAKE_CURRENT_BINARY_DIR}/${testcase} ${DOCTEST_TEST_FILTER}
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        )
+        set_tests_properties("${testcase}_valgrind" PROPERTIES LABELS "valgrind")
+    endif()
+endforeach()
+
+add_executable(json_unit EXCLUDE_FROM_ALL $<TARGET_OBJECTS:doctest_main> ${files})
+target_compile_definitions(json_unit PRIVATE DOCTEST_CONFIG_SUPER_FAST_ASSERTS)
+target_compile_options(json_unit PRIVATE
+    $<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>
+    $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-deprecated;-Wno-float-equal>
+    $<$<CXX_COMPILER_ID:GNU>:-Wno-deprecated-declarations>
+)
+target_include_directories(json_unit PRIVATE ${CMAKE_BINARY_DIR}/include thirdparty/doctest thirdparty/fifo_map)
+target_link_libraries(json_unit ${NLOHMANN_JSON_TARGET_NAME})
+add_dependencies(json_unit download_test_data)
+
+#############################################################################
+# Test the generated build configs
+#############################################################################
+
+add_subdirectory(cmake_import)
+add_subdirectory(cmake_import_minver)
+add_subdirectory(cmake_add_subdirectory)
+add_subdirectory(cmake_fetch_content)
+add_subdirectory(cmake_target_include_directories)

vendor/json/test/Makefile

@@ -0,0 +1,29 @@
+##############################################################################
+# OSS-Fuzz
+##############################################################################
+
+# The following targets realize the integration to OSS-Fuzz.
+# See <https://github.com/google/oss-fuzz/blob/master/projects/json/build.sh> for more information.
+
+# additional flags
+CXXFLAGS += -std=c++11
+CPPFLAGS += -I ../single_include
+
+FUZZER_ENGINE = src/fuzzer-driver_afl.cpp
+FUZZERS = parse_afl_fuzzer parse_bson_fuzzer parse_cbor_fuzzer parse_msgpack_fuzzer parse_ubjson_fuzzer
+fuzzers: $(FUZZERS)
+
+parse_afl_fuzzer:
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_json.cpp -o $@
+
+parse_bson_fuzzer:
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_bson.cpp -o $@
+
+parse_cbor_fuzzer:
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_cbor.cpp -o $@
+
+parse_msgpack_fuzzer:
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_msgpack.cpp -o $@
+
+parse_ubjson_fuzzer:
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(FUZZER_ENGINE) src/fuzzer-parse_ubjson.cpp -o $@

vendor/json/test/cmake_add_subdirectory/CMakeLists.txt

@@ -0,0 +1,18 @@
+add_test(NAME cmake_add_subdirectory_configure
+  COMMAND ${CMAKE_COMMAND}
+    -G "${CMAKE_GENERATOR}"
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -Dnlohmann_json_source=${PROJECT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/project
+)
+add_test(NAME cmake_add_subdirectory_build
+  COMMAND ${CMAKE_COMMAND} --build .
+)
+set_tests_properties(cmake_add_subdirectory_configure PROPERTIES
+  FIXTURES_SETUP cmake_add_subdirectory
+  LABELS not_reproducible
+)
+set_tests_properties(cmake_add_subdirectory_build PROPERTIES
+  FIXTURES_REQUIRED cmake_add_subdirectory
+  LABELS not_reproducible
+)

vendor/json/test/cmake_add_subdirectory/project/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(DummyImport CXX)
+
+set(JSON_BuildTests OFF CACHE INTERNAL "")
+add_subdirectory(${nlohmann_json_source}
+   ${CMAKE_CURRENT_BINARY_DIR}/nlohmann_json)
+
+add_executable(with_namespace_target main.cpp)
+target_link_libraries(with_namespace_target nlohmann_json::nlohmann_json)
+
+add_executable(without_namespace_target main.cpp)
+target_link_libraries(without_namespace_target nlohmann_json)
+
+if(NOT MSVC)
+    add_executable(without_exceptions main.cpp)
+    target_link_libraries(without_exceptions nlohmann_json::nlohmann_json)
+    target_compile_definitions(without_exceptions PRIVATE JSON_NOEXCEPTION)
+    target_compile_options(without_exceptions PRIVATE -fno-exceptions)
+endif()

vendor/json/test/cmake_add_subdirectory/project/main.cpp

@@ -0,0 +1,8 @@
+#include <nlohmann/json.hpp>
+
+int main(int argc, char **argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

vendor/json/test/cmake_fetch_content/CMakeLists.txt

@@ -0,0 +1,20 @@
+if (${CMAKE_VERSION} VERSION_GREATER "3.11.0")
+  add_test(NAME cmake_fetch_content_configure
+    COMMAND ${CMAKE_COMMAND}
+    -G "${CMAKE_GENERATOR}"
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -Dnlohmann_json_source=${PROJECT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/project
+  )
+  add_test(NAME cmake_fetch_content_build
+    COMMAND ${CMAKE_COMMAND} --build .
+  )
+  set_tests_properties(cmake_fetch_content_configure PROPERTIES
+    FIXTURES_SETUP cmake_fetch_content
+    LABELS "git_required;not_reproducible"
+  )
+  set_tests_properties(cmake_fetch_content_build PROPERTIES
+    FIXTURES_REQUIRED cmake_fetch_content
+    LABELS "git_required;not_reproducible"
+  )
+endif()

vendor/json/test/cmake_fetch_content/project/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.11)
+
+project(DummyImport CXX)
+
+include(FetchContent)
+
+get_filename_component(GIT_REPOSITORY_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../../.. ABSOLUTE)
+FetchContent_Declare(json GIT_REPOSITORY ${GIT_REPOSITORY_DIRECTORY} GIT_TAG HEAD)
+
+FetchContent_GetProperties(json)
+if(NOT json_POPULATED)
+  FetchContent_Populate(json)
+  add_subdirectory(${json_SOURCE_DIR} ${json_BINARY_DIR} EXCLUDE_FROM_ALL)
+endif()
+
+add_executable(with_namespace_target main.cpp)
+target_link_libraries(with_namespace_target nlohmann_json::nlohmann_json)
+
+add_executable(without_namespace_target main.cpp)
+target_link_libraries(without_namespace_target nlohmann_json)

vendor/json/test/cmake_fetch_content/project/main.cpp

@@ -0,0 +1,8 @@
+#include <nlohmann/json.hpp>
+
+int main(int argc, char **argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

vendor/json/test/cmake_import/CMakeLists.txt

@@ -0,0 +1,19 @@
+add_test(NAME cmake_import_configure
+  COMMAND ${CMAKE_COMMAND}
+    -G "${CMAKE_GENERATOR}"
+    -A "${CMAKE_GENERATOR_PLATFORM}"
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -Dnlohmann_json_DIR=${PROJECT_BINARY_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/project
+)
+add_test(NAME cmake_import_build
+  COMMAND ${CMAKE_COMMAND} --build .
+)
+set_tests_properties(cmake_import_configure PROPERTIES
+  FIXTURES_SETUP cmake_import
+  LABELS not_reproducible
+)
+set_tests_properties(cmake_import_build PROPERTIES
+  FIXTURES_REQUIRED cmake_import
+  LABELS not_reproducible
+)

vendor/json/test/cmake_import/project/CMakeLists.txt

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(DummyImport CXX)
+
+find_package(nlohmann_json REQUIRED)
+
+add_executable(with_namespace_target main.cpp)
+target_link_libraries(with_namespace_target nlohmann_json::nlohmann_json)
+
+add_executable(without_namespace_target main.cpp)
+target_link_libraries(without_namespace_target nlohmann_json)
+

vendor/json/test/cmake_import/project/main.cpp

@@ -0,0 +1,8 @@
+#include <nlohmann/json.hpp>
+
+int main(int argc, char **argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

vendor/json/test/cmake_import_minver/CMakeLists.txt

@@ -0,0 +1,19 @@
+add_test(NAME cmake_import_minver_configure
+  COMMAND ${CMAKE_COMMAND}
+    -G "${CMAKE_GENERATOR}"
+    -A "${CMAKE_GENERATOR_PLATFORM}"
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -Dnlohmann_json_DIR=${PROJECT_BINARY_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/project
+)
+add_test(NAME cmake_import_minver_build
+  COMMAND ${CMAKE_COMMAND} --build .
+)
+set_tests_properties(cmake_import_minver_configure PROPERTIES
+  FIXTURES_SETUP cmake_import_minver
+  LABELS not_reproducible
+)
+set_tests_properties(cmake_import_minver_build PROPERTIES
+  FIXTURES_REQUIRED cmake_import_minver
+  LABELS not_reproducible
+)

vendor/json/test/cmake_import_minver/project/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(DummyImportMinVer CXX)
+
+find_package(nlohmann_json 3.2.0 REQUIRED)
+
+add_executable(with_namespace_target main.cpp)
+target_link_libraries(with_namespace_target nlohmann_json::nlohmann_json)

vendor/json/test/cmake_import_minver/project/main.cpp

@@ -0,0 +1,8 @@
+#include <nlohmann/json.hpp>
+
+int main(int argc, char **argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

vendor/json/test/cmake_target_include_directories/CMakeLists.txt

@@ -0,0 +1,18 @@
+add_test(NAME cmake_target_include_directories_configure
+  COMMAND ${CMAKE_COMMAND}
+    -G "${CMAKE_GENERATOR}"
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -Dnlohmann_json_source=${PROJECT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/project
+)
+add_test(NAME cmake_target_include_directories_build
+    COMMAND ${CMAKE_COMMAND} --build .
+)
+set_tests_properties(cmake_target_include_directories_configure PROPERTIES
+    FIXTURES_SETUP cmake_target_include_directories
+    LABELS not_reproducible
+)
+set_tests_properties(cmake_target_include_directories_build PROPERTIES
+    FIXTURES_REQUIRED cmake_target_include_directories
+    LABELS not_reproducible
+)

vendor/json/test/cmake_target_include_directories/project/Bar.cpp

@@ -0,0 +1,3 @@
+#include "Bar.hpp"
+
+class Bar;

vendor/json/test/cmake_target_include_directories/project/Bar.hpp

@@ -0,0 +1,4 @@
+#include <nlohmann/json.hpp>
+#include "Foo.hpp"
+
+class Bar : public Foo{};

vendor/json/test/cmake_target_include_directories/project/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(DummyImport CXX)
+
+add_executable(with_private_target main.cpp)
+target_include_directories(with_private_target PRIVATE ${nlohmann_json_source}/include)
+set_target_properties(with_private_target PROPERTIES CXX_STANDARD 11)
+
+add_executable(with_private_system_target main.cpp)
+target_include_directories(with_private_system_target PRIVATE SYSTEM ${nlohmann_json_source}/include)
+set_target_properties(with_private_system_target PROPERTIES CXX_STANDARD 11)
+
+# regression from https://github.com/nlohmann/json/discussions/2281
+add_library(Foo STATIC Foo.cpp Bar.cpp)
+target_include_directories(Foo PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} ${nlohmann_json_source}/include)
+set_target_properties(Foo PROPERTIES CXX_STANDARD 11)
+
+add_library(Bar STATIC Bar.cpp)
+target_link_libraries(Bar PRIVATE Foo)
+target_include_directories(Bar PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} ${nlohmann_json_source}/include)
+set_target_properties(Bar PROPERTIES CXX_STANDARD 11)

vendor/json/test/cmake_target_include_directories/project/Foo.cpp

@@ -0,0 +1,3 @@
+#include "Foo.hpp"
+
+class Foo;

vendor/json/test/cmake_target_include_directories/project/Foo.hpp

@@ -0,0 +1,4 @@
+#pragma once
+#include <nlohmann/json.hpp>
+
+class Foo{};

vendor/json/test/cmake_target_include_directories/project/main.cpp

@@ -0,0 +1,8 @@
+#include <nlohmann/json.hpp>
+
+int main(int argc, char **argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

vendor/json/test/reports/2016-08-29-fuzz/index.html

@@ -0,0 +1,10 @@
+<table style="font-family: 'Trebuchet MS', 'Tahoma', 'Arial', 'Helvetica'">
+<tr><td style="width: 18ex"><b>Banner:</b></td><td>fuzz</td></tr>
+<tr><td><b>Directory:</b></td><td>fuzz-testing/out</td></tr>
+<tr><td><b>Generated on:</b></td><td>Mo 29 Aug 2016 22:14:22 CEST</td></tr>
+</table>
+<p>
+<img src="high_freq.png" width=1000 height=300><p>
+<img src="low_freq.png" width=1000 height=200><p>
+<img src="exec_speed.png" width=1000 height=200>
+

vendor/json/test/reports/2016-09-09-nativejson_benchmark/README.md

@@ -0,0 +1,31 @@
+Results of the latest benchmark from <https://github.com/miloyip/nativejson-benchmark>.
+
+See <https://github.com/nlohmann/json/issues/307> for discussion.
+
+Original post at 2016-09-09 to <json@yahoogroups.com>:
+
+> Hi,
+> 
+> This benchmark evaluated conformance, parse/stringify speed/memory, and
+> code size. It can also be viewed as a long list of open source C/C++ JSON
+> libraries.
+> 
+> You can run the benchmark on your own machine by checkout this project.
+> 
+> https://github.com/miloyip/nativejson-benchmark
+> 
+> You can also view some sample results here:
+> 
+> https://rawgit.com/miloyip/nativejson-benchmark/master/sample/conformance.html
+> https://rawgit.com/miloyip/nativejson-benchmark/master/sample/performance_Corei7-4980HQ@2.80GHz_mac64_clang7.0.html
+> 
+> If you make a new library, you may use this for testing conformance and
+> performance. Afterwards, please submit a pull request.
+> 
+> Enjoy!
+> 
+> -- 
+> Milo Yip
+> 
+> https://github.com/miloyip/
+> http://twitter.com/miloyip/

vendor/json/test/reports/2016-09-09-nativejson_benchmark/conformance_Nlohmann (C++11).md

@@ -0,0 +1,670 @@
+
+
+
+
+<!DOCTYPE html>
+<html lang="en" class="">
+  <head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# object: http://ogp.me/ns/object# article: http://ogp.me/ns/article# profile: http://ogp.me/ns/profile#">
+    <meta charset='utf-8'>
+    
+
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+    <article class="markdown-body entry-content" itemprop="text"><h1><a id="user-content-conformance-of-nlohmann-c11" class="anchor" href="#conformance-of-nlohmann-c11" aria-hidden="true"><svg aria-hidden="true" class="octicon octicon-link" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Conformance of Nlohmann (C++11)</h1>
+
+<h2><a id="user-content-1-parse-validation" class="anchor" href="#1-parse-validation" aria-hidden="true"><svg aria-hidden="true" class="octicon octicon-link" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>1. Parse Validation</h2>
+
+<p>Summary: 34 of 34 are correct.</p>
+
+<h2><a id="user-content-2-parse-double" class="anchor" href="#2-parse-double" aria-hidden="true"><svg aria-hidden="true" class="octicon octicon-link" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>2. Parse Double</h2>
+
+<p>Summary: 66 of 66 are correct.</p>
+
+<h2><a id="user-content-3-parse-string" class="anchor" href="#3-parse-string" aria-hidden="true"><svg aria-hidden="true" class="octicon octicon-link" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>3. Parse String</h2>
+
+<p>Summary: 9 of 9 are correct.</p>
+
+<h2><a id="user-content-4-roundtrip" class="anchor" href="#4-roundtrip" aria-hidden="true"><svg aria-hidden="true" class="octicon octicon-link" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>4. Roundtrip</h2>
+
+<ul>
+<li>Fail:</li>
+</ul>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">5e-324</span>]</pre></div>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">4.94065645841247e-324</span>]</pre></div>
+
+<ul>
+<li>Fail:</li>
+</ul>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">2.225073858507201e-308</span>]</pre></div>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">2.2250738585072e-308</span>]</pre></div>
+
+<ul>
+<li>Fail:</li>
+</ul>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">2.2250738585072014e-308</span>]</pre></div>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">2.2250738585072e-308</span>]</pre></div>
+
+<ul>
+<li>Fail:</li>
+</ul>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">1.7976931348623157e308</span>]</pre></div>
+
+<div class="highlight highlight-source-js"><pre>[<span class="pl-c1">1.79769313486232e+308</span>]</pre></div>
+
+<p>Summary: 23 of 27 are correct.</p>
+</article>
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+      <script crossorigin="anonymous" src="https://assets-cdn.github.com/assets/frameworks-88471af1fec40ff9418efbe2ddd15b6896af8d772f8179004c254dffc25ea490.js"></script>
+      <script async="async" crossorigin="anonymous" src="https://assets-cdn.github.com/assets/github-e18e11a943ff2eb9394c72d4ec8b76592c454915b5839ae177d422777a046e29.js"></script>
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+

vendor/json/test/reports/2016-10-02-fuzz/index.html

@@ -0,0 +1,10 @@
+<table style="font-family: 'Trebuchet MS', 'Tahoma', 'Arial', 'Helvetica'">
+<tr><td style="width: 18ex"><b>Banner:</b></td><td>fuzz</td></tr>
+<tr><td><b>Directory:</b></td><td>fuzz-testing/out</td></tr>
+<tr><td><b>Generated on:</b></td><td>Sun Oct  2 08:51:02 CEST 2016</td></tr>
+</table>
+<p>
+<img src="high_freq.png" width=1000 height=300><p>
+<img src="low_freq.png" width=1000 height=200><p>
+<img src="exec_speed.png" width=1000 height=200>
+

vendor/json/test/src/UBSAN.supp

@@ -0,0 +1 @@
+unsigned-integer-overflow:stl_bvector.h

vendor/json/test/src/fuzzer-driver_afl.cpp

@@ -0,0 +1,38 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a driver for American Fuzzy Lop (afl-fuzz). It relies on
+an implementation of the `LLVMFuzzerTestOneInput` function which processes a
+passed byte array.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <vector>    // for vector
+#include <cstdint>   // for uint8_t
+#include <iostream>  // for cin
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
+
+int main()
+{
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    while (__AFL_LOOP(1000))
+    {
+#endif
+        // copy stdin to byte vector
+        std::vector<uint8_t> vec;
+        char c;
+        while (std::cin.get(c))
+        {
+            vec.push_back(static_cast<uint8_t>(c));
+        }
+
+        LLVMFuzzerTestOneInput(vec.data(), vec.size());
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    }
+#endif
+}

vendor/json/test/src/fuzzer-parse_bson.cpp

@@ -0,0 +1,73 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = from_bson(data)
+- vec = to_bson(j1)
+- j2 = from_bson(vec)
+- assert(j1 == j2)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// see http://llvm.org/docs/LibFuzzer.html
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    try
+    {
+        // step 1: parse input
+        std::vector<uint8_t> vec1(data, data + size);
+        json j1 = json::from_bson(vec1);
+
+        if (j1.is_discarded())
+        {
+            return 0;
+        }
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> vec2 = json::to_bson(j1);
+
+            // parse serialization
+            json j2 = json::from_bson(vec2);
+
+            // serializations must match
+            assert(json::to_bson(j2) == vec2);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a BSON serialization must not fail
+            assert(false);
+        }
+    }
+    catch (const json::parse_error&)
+    {
+        // parse errors are ok, because input may be random bytes
+    }
+    catch (const json::type_error&)
+    {
+        // type errors can occur during parsing, too
+    }
+    catch (const json::out_of_range&)
+    {
+        // out of range errors can occur during parsing, too
+    }
+
+    // return 0 - non-zero return values are reserved for future use
+    return 0;
+}

vendor/json/test/src/fuzzer-parse_cbor.cpp

@@ -0,0 +1,68 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = from_cbor(data)
+- vec = to_cbor(j1)
+- j2 = from_cbor(vec)
+- assert(j1 == j2)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// see http://llvm.org/docs/LibFuzzer.html
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    try
+    {
+        // step 1: parse input
+        std::vector<uint8_t> vec1(data, data + size);
+        json j1 = json::from_cbor(vec1);
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> vec2 = json::to_cbor(j1);
+
+            // parse serialization
+            json j2 = json::from_cbor(vec2);
+
+            // serializations must match
+            assert(json::to_cbor(j2) == vec2);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a CBOR serialization must not fail
+            assert(false);
+        }
+    }
+    catch (const json::parse_error&)
+    {
+        // parse errors are ok, because input may be random bytes
+    }
+    catch (const json::type_error&)
+    {
+        // type errors can occur during parsing, too
+    }
+    catch (const json::out_of_range&)
+    {
+        // out of range errors can occur during parsing, too
+    }
+
+    // return 0 - non-zero return values are reserved for future use
+    return 0;
+}

vendor/json/test/src/fuzzer-parse_json.cpp

@@ -0,0 +1,69 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = parse(data)
+- s1 = serialize(j1)
+- j2 = parse(s1)
+- s2 = serialize(j2)
+- assert(s1 == s2)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// see http://llvm.org/docs/LibFuzzer.html
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    try
+    {
+        // step 1: parse input
+        json j1 = json::parse(data, data + size);
+
+        try
+        {
+            // step 2: round trip
+
+            // first serialization
+            std::string s1 = j1.dump();
+
+            // parse serialization
+            json j2 = json::parse(s1);
+
+            // second serialization
+            std::string s2 = j2.dump();
+
+            // serializations must match
+            assert(s1 == s2);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a JSON serialization must not fail
+            assert(false);
+        }
+    }
+    catch (const json::parse_error&)
+    {
+        // parse errors are ok, because input may be random bytes
+    }
+    catch (const json::out_of_range&)
+    {
+        // out of range errors may happen if provided sizes are excessive
+    }
+
+    // return 0 - non-zero return values are reserved for future use
+    return 0;
+}

vendor/json/test/src/fuzzer-parse_msgpack.cpp

@@ -0,0 +1,68 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = from_msgpack(data)
+- vec = to_msgpack(j1)
+- j2 = from_msgpack(vec)
+- assert(j1 == j2)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// see http://llvm.org/docs/LibFuzzer.html
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    try
+    {
+        // step 1: parse input
+        std::vector<uint8_t> vec1(data, data + size);
+        json j1 = json::from_msgpack(vec1);
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> vec2 = json::to_msgpack(j1);
+
+            // parse serialization
+            json j2 = json::from_msgpack(vec2);
+
+            // serializations must match
+            assert(json::to_msgpack(j2) == vec2);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a MessagePack serialization must not fail
+            assert(false);
+        }
+    }
+    catch (const json::parse_error&)
+    {
+        // parse errors are ok, because input may be random bytes
+    }
+    catch (const json::type_error&)
+    {
+        // type errors can occur during parsing, too
+    }
+    catch (const json::out_of_range&)
+    {
+        // out of range errors may happen if provided sizes are excessive
+    }
+
+    // return 0 - non-zero return values are reserved for future use
+    return 0;
+}

vendor/json/test/src/fuzzer-parse_ubjson.cpp

@@ -0,0 +1,84 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = from_ubjson(data)
+- vec = to_ubjson(j1)
+- j2 = from_ubjson(vec)
+- assert(j1 == j2)
+- vec2 = to_ubjson(j1, use_size = true, use_type = false)
+- j3 = from_ubjson(vec2)
+- assert(j1 == j3)
+- vec3 = to_ubjson(j1, use_size = true, use_type = true)
+- j4 = from_ubjson(vec3)
+- assert(j1 == j4)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// see http://llvm.org/docs/LibFuzzer.html
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    try
+    {
+        // step 1: parse input
+        std::vector<uint8_t> vec1(data, data + size);
+        json j1 = json::from_ubjson(vec1);
+
+        try
+        {
+            // step 2.1: round trip without adding size annotations to container types
+            std::vector<uint8_t> vec2 = json::to_ubjson(j1, false, false);
+
+            // step 2.2: round trip with adding size annotations but without adding type annonations to container types
+            std::vector<uint8_t> vec3 = json::to_ubjson(j1, true, false);
+
+            // step 2.3: round trip with adding size as well as type annotations to container types
+            std::vector<uint8_t> vec4 = json::to_ubjson(j1, true, true);
+
+            // parse serialization
+            json j2 = json::from_ubjson(vec2);
+            json j3 = json::from_ubjson(vec3);
+            json j4 = json::from_ubjson(vec4);
+
+            // serializations must match
+            assert(json::to_ubjson(j2, false, false) == vec2);
+            assert(json::to_ubjson(j3, true, false) == vec3);
+            assert(json::to_ubjson(j4, true, true) == vec4);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a UBJSON serialization must not fail
+            assert(false);
+        }
+    }
+    catch (const json::parse_error&)
+    {
+        // parse errors are ok, because input may be random bytes
+    }
+    catch (const json::type_error&)
+    {
+        // type errors can occur during parsing, too
+    }
+    catch (const json::out_of_range&)
+    {
+        // out of range errors may happen if provided sizes are excessive
+    }
+
+    // return 0 - non-zero return values are reserved for future use
+    return 0;
+}

vendor/json/test/src/test_utils.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <cstdint> // uint8_t
+#include <fstream> // ifstream, istreambuf_iterator, ios
+#include <vector> // vector
+
+namespace utils
+{
+
+inline std::vector<std::uint8_t> read_binary_file(const std::string& filename)
+{
+    std::ifstream file(filename, std::ios::binary);
+    file.unsetf(std::ios::skipws);
+
+    file.seekg(0, std::ios::end);
+    const auto size = file.tellg();
+    file.seekg(0, std::ios::beg);
+
+    std::vector<std::uint8_t> byte_vector;
+    byte_vector.reserve(static_cast<std::size_t>(size));
+    byte_vector.insert(byte_vector.begin(), std::istream_iterator<std::uint8_t>(file), std::istream_iterator<std::uint8_t>());
+    return byte_vector;
+}
+
+} // namespace utils

vendor/json/test/src/unit-algorithms.cpp

@@ -0,0 +1,320 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("algorithms")
+{
+    json j_array = {13, 29, 3, {{"one", 1}, {"two", 2}}, true, false, {1, 2, 3}, "foo", "baz"};
+    json j_object = {{"one", 1}, {"two", 2}};
+
+    SECTION("non-modifying sequence operations")
+    {
+        SECTION("std::all_of")
+        {
+            CHECK(std::all_of(j_array.begin(), j_array.end(), [](const json & value)
+            {
+                return value.size() > 0;
+            }));
+            CHECK(std::all_of(j_object.begin(), j_object.end(), [](const json & value)
+            {
+                return value.type() == json::value_t::number_integer;
+            }));
+        }
+
+        SECTION("std::any_of")
+        {
+            CHECK(std::any_of(j_array.begin(), j_array.end(), [](const json & value)
+            {
+                return value.is_string() && value.get<std::string>() == "foo";
+            }));
+            CHECK(std::any_of(j_object.begin(), j_object.end(), [](const json & value)
+            {
+                return value.get<int>() > 1;
+            }));
+        }
+
+        SECTION("std::none_of")
+        {
+            CHECK(std::none_of(j_array.begin(), j_array.end(), [](const json & value)
+            {
+                return value.size() == 0;
+            }));
+            CHECK(std::none_of(j_object.begin(), j_object.end(), [](const json & value)
+            {
+                return value.get<int>() <= 0;
+            }));
+        }
+
+        SECTION("std::for_each")
+        {
+            SECTION("reading")
+            {
+                int sum = 0;
+
+                std::for_each(j_array.cbegin(), j_array.cend(), [&sum](const json & value)
+                {
+                    if (value.is_number())
+                    {
+                        sum += static_cast<int>(value);
+                    }
+                });
+
+                CHECK(sum == 45);
+            }
+
+            SECTION("writing")
+            {
+                auto add17 = [](json & value)
+                {
+                    if (value.is_array())
+                    {
+                        value.push_back(17);
+                    }
+                };
+
+                std::for_each(j_array.begin(), j_array.end(), add17);
+
+                CHECK(j_array[6] == json({1, 2, 3, 17}));
+            }
+        }
+
+        SECTION("std::count")
+        {
+            CHECK(std::count(j_array.begin(), j_array.end(), json(true)) == 1);
+        }
+
+        SECTION("std::count_if")
+        {
+            CHECK(std::count_if(j_array.begin(), j_array.end(), [](const json & value)
+            {
+                return (value.is_number());
+            }) == 3);
+            CHECK(std::count_if(j_array.begin(), j_array.end(), [](const json&)
+            {
+                return true;
+            }) == 9);
+        }
+
+        SECTION("std::mismatch")
+        {
+            json j_array2 = {13, 29, 3, {{"one", 1}, {"two", 2}, {"three", 3}}, true, false, {1, 2, 3}, "foo", "baz"};
+            auto res = std::mismatch(j_array.begin(), j_array.end(), j_array2.begin());
+            CHECK(*res.first == json({{"one", 1}, {"two", 2}}));
+            CHECK(*res.second == json({{"one", 1}, {"two", 2}, {"three", 3}}));
+        }
+
+        SECTION("std::equal")
+        {
+            SECTION("using operator==")
+            {
+                CHECK(std::equal(j_array.begin(), j_array.end(), j_array.begin()));
+                CHECK(std::equal(j_object.begin(), j_object.end(), j_object.begin()));
+                CHECK(!std::equal(j_array.begin(), j_array.end(), j_object.begin()));
+            }
+
+            SECTION("using user-defined comparison")
+            {
+                // compare objects only by size of its elements
+                json j_array2 = {13, 29, 3, {"Hello", "World"}, true, false, {{"one", 1}, {"two", 2}, {"three", 3}}, "foo", "baz"};
+                CHECK(!std::equal(j_array.begin(), j_array.end(), j_array2.begin()));
+                CHECK(std::equal(j_array.begin(), j_array.end(), j_array2.begin(),
+                                 [](const json & a, const json & b)
+                {
+                    return (a.size() == b.size());
+                }));
+            }
+        }
+
+        SECTION("std::find")
+        {
+            auto it = std::find(j_array.begin(), j_array.end(), json(false));
+            CHECK(std::distance(j_array.begin(), it) == 5);
+        }
+
+        SECTION("std::find_if")
+        {
+            auto it = std::find_if(j_array.begin(), j_array.end(),
+                                   [](const json & value)
+            {
+                return value.is_boolean();
+            });
+            CHECK(std::distance(j_array.begin(), it) == 4);
+        }
+
+        SECTION("std::find_if_not")
+        {
+            auto it = std::find_if_not(j_array.begin(), j_array.end(),
+                                       [](const json & value)
+            {
+                return value.is_number();
+            });
+            CHECK(std::distance(j_array.begin(), it) == 3);
+        }
+
+        SECTION("std::adjacent_find")
+        {
+            CHECK(std::adjacent_find(j_array.begin(), j_array.end()) == j_array.end());
+            CHECK(std::adjacent_find(j_array.begin(), j_array.end(),
+                                     [](const json & v1, const json & v2)
+            {
+                return v1.type() == v2.type();
+            }) == j_array.begin());
+        }
+    }
+
+    SECTION("modifying sequence operations")
+    {
+        SECTION("std::reverse")
+        {
+            std::reverse(j_array.begin(), j_array.end());
+            CHECK(j_array == json({"baz", "foo", {1, 2, 3}, false, true, {{"one", 1}, {"two", 2}}, 3, 29, 13}));
+        }
+
+        SECTION("std::rotate")
+        {
+            std::rotate(j_array.begin(), j_array.begin() + 1, j_array.end());
+            CHECK(j_array == json({29, 3, {{"one", 1}, {"two", 2}}, true, false, {1, 2, 3}, "foo", "baz", 13}));
+        }
+
+        SECTION("std::partition")
+        {
+            auto it = std::partition(j_array.begin(), j_array.end(), [](const json & v)
+            {
+                return v.is_string();
+            });
+            CHECK(std::distance(j_array.begin(), it) == 2);
+            CHECK(!it[2].is_string());
+        }
+    }
+
+    SECTION("sorting operations")
+    {
+        SECTION("std::sort")
+        {
+            SECTION("with standard comparison")
+            {
+                json j = {13, 29, 3, {{"one", 1}, {"two", 2}}, true, false, {1, 2, 3}, "foo", "baz", nullptr};
+                std::sort(j.begin(), j.end());
+                CHECK(j == json({nullptr, false, true, 3, 13, 29, {{"one", 1}, {"two", 2}}, {1, 2, 3}, "baz", "foo"}));
+            }
+
+            SECTION("with user-defined comparison")
+            {
+                json j = {3, {{"one", 1}, {"two", 2}}, {1, 2, 3}, nullptr};
+                std::sort(j.begin(), j.end(), [](const json & a, const json & b)
+                {
+                    return a.size() < b.size();
+                });
+                CHECK(j == json({nullptr, 3, {{"one", 1}, {"two", 2}}, {1, 2, 3}}));
+            }
+
+            SECTION("sorting an object")
+            {
+                json j({{"one", 1}, {"two", 2}});
+                CHECK_THROWS_AS(std::sort(j.begin(), j.end()), json::invalid_iterator&);
+                CHECK_THROWS_WITH(std::sort(j.begin(), j.end()),
+                                  "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
+            }
+        }
+
+        SECTION("std::partial_sort")
+        {
+            json j = {13, 29, 3, {{"one", 1}, {"two", 2}}, true, false, {1, 2, 3}, "foo", "baz", nullptr};
+            std::partial_sort(j.begin(), j.begin() + 4, j.end());
+            CHECK(j == json({nullptr, false, true, 3, {{"one", 1}, {"two", 2}}, 29, {1, 2, 3}, "foo", "baz", 13}));
+        }
+    }
+
+    SECTION("set operations")
+    {
+        SECTION("std::merge")
+        {
+            {
+                json j1 = {2, 4, 6, 8};
+                json j2 = {1, 2, 3, 5, 7};
+                json j3;
+
+                std::merge(j1.begin(), j1.end(), j2.begin(), j2.end(), std::back_inserter(j3));
+                CHECK(j3 == json({1, 2, 2, 3, 4, 5, 6, 7, 8}));
+            }
+        }
+
+        SECTION("std::set_difference")
+        {
+            json j1 = {1, 2, 3, 4, 5, 6, 7, 8};
+            json j2 = {1, 2, 3, 5, 7};
+            json j3;
+
+            std::set_difference(j1.begin(), j1.end(), j2.begin(), j2.end(), std::back_inserter(j3));
+            CHECK(j3 == json({4, 6, 8}));
+        }
+
+        SECTION("std::set_intersection")
+        {
+            json j1 = {1, 2, 3, 4, 5, 6, 7, 8};
+            json j2 = {1, 2, 3, 5, 7};
+            json j3;
+
+            std::set_intersection(j1.begin(), j1.end(), j2.begin(), j2.end(), std::back_inserter(j3));
+            CHECK(j3 == json({1, 2, 3, 5, 7}));
+        }
+
+        SECTION("std::set_union")
+        {
+            json j1 = {2, 4, 6, 8};
+            json j2 = {1, 2, 3, 5, 7};
+            json j3;
+
+            std::set_union(j1.begin(), j1.end(), j2.begin(), j2.end(), std::back_inserter(j3));
+            CHECK(j3 == json({1, 2, 3, 4, 5, 6, 7, 8}));
+        }
+
+        SECTION("std::set_symmetric_difference")
+        {
+            json j1 = {2, 4, 6, 8};
+            json j2 = {1, 2, 3, 5, 7};
+            json j3;
+
+            std::set_symmetric_difference(j1.begin(), j1.end(), j2.begin(), j2.end(), std::back_inserter(j3));
+            CHECK(j3 == json({1, 3, 4, 5, 6, 7, 8}));
+        }
+    }
+
+    SECTION("heap operations")
+    {
+        std::make_heap(j_array.begin(), j_array.end());
+        CHECK(std::is_heap(j_array.begin(), j_array.end()));
+        std::sort_heap(j_array.begin(), j_array.end());
+        CHECK(j_array == json({false, true, 3, 13, 29, {{"one", 1}, {"two", 2}}, {1, 2, 3}, "baz", "foo"}));
+    }
+}

vendor/json/test/src/unit-allocator.cpp

@@ -0,0 +1,278 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+namespace
+{
+// special test case to check if memory is leaked if constructor throws
+template<class T>
+struct bad_allocator : std::allocator<T>
+{
+    template<class... Args>
+    void construct(T*, Args&& ...)
+    {
+        throw std::bad_alloc();
+    }
+};
+}
+
+TEST_CASE("bad_alloc")
+{
+    SECTION("bad_alloc")
+    {
+        // create JSON type using the throwing allocator
+        using bad_json = nlohmann::basic_json<std::map,
+              std::vector,
+              std::string,
+              bool,
+              std::int64_t,
+              std::uint64_t,
+              double,
+              bad_allocator>;
+
+        // creating an object should throw
+        CHECK_THROWS_AS(bad_json(bad_json::value_t::object), std::bad_alloc&);
+    }
+}
+
+namespace
+{
+bool next_construct_fails = false;
+bool next_destroy_fails = false;
+bool next_deallocate_fails = false;
+
+template<class T>
+struct my_allocator : std::allocator<T>
+{
+    using std::allocator<T>::allocator;
+
+    template<class... Args>
+    void construct(T* p, Args&& ... args)
+    {
+        if (next_construct_fails)
+        {
+            next_construct_fails = false;
+            throw std::bad_alloc();
+        }
+        else
+        {
+            ::new (reinterpret_cast<void*>(p)) T(std::forward<Args>(args)...);
+        }
+    }
+
+    void deallocate(T* p, std::size_t n)
+    {
+        if (next_deallocate_fails)
+        {
+            next_deallocate_fails = false;
+            throw std::bad_alloc();
+        }
+        else
+        {
+            std::allocator<T>::deallocate(p, n);
+        }
+    }
+
+    void destroy(T* p)
+    {
+        if (next_destroy_fails)
+        {
+            next_destroy_fails = false;
+            throw std::bad_alloc();
+        }
+        else
+        {
+            p->~T();
+        }
+    }
+
+    template <class U>
+    struct rebind
+    {
+        using other = my_allocator<U>;
+    };
+};
+
+// allows deletion of raw pointer, usually hold by json_value
+template<class T>
+void my_allocator_clean_up(T* p)
+{
+    assert(p != nullptr);
+    my_allocator<T> alloc;
+    alloc.destroy(p);
+    alloc.deallocate(p, 1);
+}
+}
+
+TEST_CASE("controlled bad_alloc")
+{
+    // create JSON type using the throwing allocator
+    using my_json = nlohmann::basic_json<std::map,
+          std::vector,
+          std::string,
+          bool,
+          std::int64_t,
+          std::uint64_t,
+          double,
+          my_allocator>;
+
+    SECTION("class json_value")
+    {
+        SECTION("json_value(value_t)")
+        {
+            SECTION("object")
+            {
+                next_construct_fails = false;
+                auto t = my_json::value_t::object;
+                CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).object));
+                next_construct_fails = true;
+                CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
+                next_construct_fails = false;
+            }
+            SECTION("array")
+            {
+                next_construct_fails = false;
+                auto t = my_json::value_t::array;
+                CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).array));
+                next_construct_fails = true;
+                CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
+                next_construct_fails = false;
+            }
+            SECTION("string")
+            {
+                next_construct_fails = false;
+                auto t = my_json::value_t::string;
+                CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).string));
+                next_construct_fails = true;
+                CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
+                next_construct_fails = false;
+            }
+        }
+
+        SECTION("json_value(const string_t&)")
+        {
+            next_construct_fails = false;
+            my_json::string_t v("foo");
+            CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(v).string));
+            next_construct_fails = true;
+            CHECK_THROWS_AS(my_json::json_value(v), std::bad_alloc&);
+            next_construct_fails = false;
+        }
+    }
+
+    SECTION("class basic_json")
+    {
+        SECTION("basic_json(const CompatibleObjectType&)")
+        {
+            next_construct_fails = false;
+            std::map<std::string, std::string> v {{"foo", "bar"}};
+            CHECK_NOTHROW(my_json(v));
+            next_construct_fails = true;
+            CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
+            next_construct_fails = false;
+        }
+
+        SECTION("basic_json(const CompatibleArrayType&)")
+        {
+            next_construct_fails = false;
+            std::vector<std::string> v {"foo", "bar", "baz"};
+            CHECK_NOTHROW(my_json(v));
+            next_construct_fails = true;
+            CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
+            next_construct_fails = false;
+        }
+
+        SECTION("basic_json(const typename string_t::value_type*)")
+        {
+            next_construct_fails = false;
+            CHECK_NOTHROW(my_json("foo"));
+            next_construct_fails = true;
+            CHECK_THROWS_AS(my_json("foo"), std::bad_alloc&);
+            next_construct_fails = false;
+        }
+
+        SECTION("basic_json(const typename string_t::value_type*)")
+        {
+            next_construct_fails = false;
+            std::string s("foo");
+            CHECK_NOTHROW(my_json(s));
+            next_construct_fails = true;
+            CHECK_THROWS_AS(my_json(s), std::bad_alloc&);
+            next_construct_fails = false;
+        }
+    }
+}
+
+namespace
+{
+template<class T>
+struct allocator_no_forward : std::allocator<T>
+{
+    allocator_no_forward() {}
+    template <class U>
+    allocator_no_forward(allocator_no_forward<U>) {}
+
+    template <class U>
+    struct rebind
+    {
+        using other =  allocator_no_forward<U>;
+    };
+
+    template <class... Args>
+    void construct(T* p, const Args& ... args) noexcept(noexcept(::new (static_cast<void*>(p)) T(args...)))
+    {
+        // force copy even if move is available
+        ::new (static_cast<void*>(p)) T(args...);
+    }
+};
+}
+
+TEST_CASE("bad my_allocator::construct")
+{
+    SECTION("my_allocator::construct doesn't forward")
+    {
+        using bad_alloc_json = nlohmann::basic_json<std::map,
+              std::vector,
+              std::string,
+              bool,
+              std::int64_t,
+              std::uint64_t,
+              double,
+              allocator_no_forward>;
+
+        bad_alloc_json j;
+        j["test"] = bad_alloc_json::array_t();
+        j["test"].push_back("should not leak");
+    }
+}

vendor/json/test/src/unit-alt-string.cpp

@@ -0,0 +1,299 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2018 Vitaliy Manushkin <agri@akamo.info>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+
+#include <string>
+#include <utility>
+
+
+/* forward declarations */
+class alt_string;
+bool operator<(const char* op1, const alt_string& op2);
+void int_to_string(alt_string& target, std::size_t value);
+
+/*
+ * This is virtually a string class.
+ * It covers std::string under the hood.
+ */
+class alt_string
+{
+  public:
+    using value_type = std::string::value_type;
+
+    alt_string(const char* str): str_impl(str) {}
+    alt_string(const char* str, std::size_t count): str_impl(str, count) {}
+    alt_string(size_t count, char chr): str_impl(count, chr) {}
+    alt_string() = default;
+
+    template <typename...TParams>
+    alt_string& append(TParams&& ...params)
+    {
+        str_impl.append(std::forward<TParams>(params)...);
+        return *this;
+    }
+
+    void push_back(char c)
+    {
+        str_impl.push_back(c);
+    }
+
+    template <typename op_type>
+    bool operator==(const op_type& op) const
+    {
+        return str_impl == op;
+    }
+
+    bool operator==(const alt_string& op) const
+    {
+        return str_impl == op.str_impl;
+    }
+
+    template <typename op_type>
+    bool operator!=(const op_type& op) const
+    {
+        return str_impl != op;
+    }
+
+    bool operator!=(const alt_string& op) const
+    {
+        return str_impl != op.str_impl;
+    }
+
+    std::size_t size() const noexcept
+    {
+        return str_impl.size();
+    }
+
+    void resize (std::size_t n)
+    {
+        str_impl.resize(n);
+    }
+
+    void resize (std::size_t n, char c)
+    {
+        str_impl.resize(n, c);
+    }
+
+    template <typename op_type>
+    bool operator<(const op_type& op) const
+    {
+        return str_impl < op;
+    }
+
+    bool operator<(const alt_string& op) const
+    {
+        return str_impl < op.str_impl;
+    }
+
+    const char* c_str() const
+    {
+        return str_impl.c_str();
+    }
+
+    char& operator[](std::size_t index)
+    {
+        return str_impl[index];
+    }
+
+    const char& operator[](std::size_t index) const
+    {
+        return str_impl[index];
+    }
+
+    char& back()
+    {
+        return str_impl.back();
+    }
+
+    const char& back() const
+    {
+        return str_impl.back();
+    }
+
+    void clear()
+    {
+        str_impl.clear();
+    }
+
+    const value_type* data()
+    {
+        return str_impl.data();
+    }
+
+  private:
+    std::string str_impl {};
+
+    friend bool ::operator<(const char*, const alt_string&);
+};
+
+void int_to_string(alt_string& target, std::size_t value)
+{
+    target = std::to_string(value).c_str();
+}
+
+using alt_json = nlohmann::basic_json <
+                 std::map,
+                 std::vector,
+                 alt_string,
+                 bool,
+                 std::int64_t,
+                 std::uint64_t,
+                 double,
+                 std::allocator,
+                 nlohmann::adl_serializer >;
+
+
+bool operator<(const char* op1, const alt_string& op2)
+{
+    return op1 < op2.str_impl;
+}
+
+TEST_CASE("alternative string type")
+{
+    SECTION("dump")
+    {
+        {
+            alt_json doc;
+            doc["pi"] = 3.141;
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"pi":3.141})");
+        }
+
+        {
+            alt_json doc;
+            doc["happy"] = true;
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"happy":true})");
+        }
+
+        {
+            alt_json doc;
+            doc["name"] = "I'm Batman";
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"name":"I'm Batman"})");
+        }
+
+        {
+            alt_json doc;
+            doc["nothing"] = nullptr;
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"nothing":null})");
+        }
+
+        {
+            alt_json doc;
+            doc["answer"]["everything"] = 42;
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"answer":{"everything":42}})");
+        }
+
+        {
+            alt_json doc;
+            doc["list"] = { 1, 0, 2 };
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"list":[1,0,2]})");
+        }
+
+        {
+            alt_json doc;
+            doc["object"] = { {"currency", "USD"}, {"value", 42.99} };
+            alt_string dump = doc.dump();
+            CHECK(dump == R"({"object":{"currency":"USD","value":42.99}})");
+        }
+    }
+
+    SECTION("parse")
+    {
+        auto doc = alt_json::parse("{\"foo\": \"bar\"}");
+        alt_string dump = doc.dump();
+        CHECK(dump == R"({"foo":"bar"})");
+    }
+
+    SECTION("items")
+    {
+        auto doc = alt_json::parse("{\"foo\": \"bar\"}");
+
+        for ( auto item : doc.items() )
+        {
+            CHECK( item.key() == "foo" );
+            CHECK( item.value() == "bar" );
+        }
+
+        auto doc_array = alt_json::parse("[\"foo\", \"bar\"]");
+
+        for ( auto item : doc_array.items() )
+        {
+            if (item.key() == "0" )
+            {
+                CHECK( item.value() == "foo" );
+            }
+            else if (item.key() == "1" )
+            {
+                CHECK( item.value() == "bar" );
+            }
+            else
+            {
+                CHECK( false );
+            }
+        }
+    }
+
+    SECTION("equality")
+    {
+        alt_json doc;
+        doc["Who are you?"] = "I'm Batman";
+
+        CHECK("I'm Batman" == doc["Who are you?"]);
+        CHECK(doc["Who are you?"]  == "I'm Batman");
+        CHECK_FALSE("I'm Batman" != doc["Who are you?"]);
+        CHECK_FALSE(doc["Who are you?"]  != "I'm Batman");
+
+        CHECK("I'm Bruce Wayne" != doc["Who are you?"]);
+        CHECK(doc["Who are you?"]  != "I'm Bruce Wayne");
+        CHECK_FALSE("I'm Bruce Wayne" == doc["Who are you?"]);
+        CHECK_FALSE(doc["Who are you?"]  == "I'm Bruce Wayne");
+
+        {
+            const alt_json& const_doc = doc;
+
+            CHECK("I'm Batman" == const_doc["Who are you?"]);
+            CHECK(const_doc["Who are you?"] == "I'm Batman");
+            CHECK_FALSE("I'm Batman" != const_doc["Who are you?"]);
+            CHECK_FALSE(const_doc["Who are you?"] != "I'm Batman");
+
+            CHECK("I'm Bruce Wayne" != const_doc["Who are you?"]);
+            CHECK(const_doc["Who are you?"] != "I'm Bruce Wayne");
+            CHECK_FALSE("I'm Bruce Wayne" == const_doc["Who are you?"]);
+            CHECK_FALSE(const_doc["Who are you?"] == "I'm Bruce Wayne");
+        }
+    }
+}

vendor/json/test/src/unit-assert_macro.cpp

@@ -0,0 +1,65 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+// avoid warning when assert does not abort
+#if defined(__GNUC__)
+    #pragma GCC diagnostic ignored "-Wstrict-overflow"
+#endif
+
+#include "doctest_compatibility.h"
+
+/// global variable to record side effect of assert calls
+static int assert_counter;
+
+/// set failure variable to true instead of calling assert(x)
+#define JSON_ASSERT(x) {if (!(x)) ++assert_counter; }
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+// the test assumes exceptions to work
+#if !defined(JSON_NOEXCEPTION)
+TEST_CASE("JSON_ASSERT(x)")
+{
+    SECTION("basic_json(first, second)")
+    {
+        assert_counter = 0;
+        CHECK(assert_counter == 0);
+
+        json::iterator it;
+        json j;
+
+        // in case assertions do not abort execution, an exception is thrown
+        CHECK_THROWS_WITH_AS(json(it, j.end()), "[json.exception.invalid_iterator.201] iterators are not compatible", json::invalid_iterator);
+
+        // check that assertion actually happened
+        CHECK(assert_counter == 1);
+    }
+}
+#endif

vendor/json/test/src/unit-capacity.cpp

@@ -0,0 +1,563 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("capacity")
+{
+    SECTION("empty()")
+    {
+        SECTION("boolean")
+        {
+            json j = true;
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == false);
+                CHECK(j_const.empty() == false);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+
+        SECTION("string")
+        {
+            json j = "hello world";
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == false);
+                CHECK(j_const.empty() == false);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+
+        SECTION("array")
+        {
+            SECTION("empty array")
+            {
+                json j = json::array();
+                const json j_const(j);
+
+                SECTION("result of empty")
+                {
+                    CHECK(j.empty() == true);
+                    CHECK(j_const.empty() == true);
+                }
+
+                SECTION("definition of empty")
+                {
+                    CHECK(j.empty() == (j.begin() == j.end()));
+                    CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+                }
+            }
+
+            SECTION("filled array")
+            {
+                json j = {1, 2, 3};
+                const json j_const(j);
+
+                SECTION("result of empty")
+                {
+                    CHECK(j.empty() == false);
+                    CHECK(j_const.empty() == false);
+                }
+
+                SECTION("definition of empty")
+                {
+                    CHECK(j.empty() == (j.begin() == j.end()));
+                    CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+                }
+            }
+        }
+
+        SECTION("object")
+        {
+            SECTION("empty object")
+            {
+                json j = json::object();
+                const json j_const(j);
+
+                SECTION("result of empty")
+                {
+                    CHECK(j.empty() == true);
+                    CHECK(j_const.empty() == true);
+                }
+
+                SECTION("definition of empty")
+                {
+                    CHECK(j.empty() == (j.begin() == j.end()));
+                    CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+                }
+            }
+
+            SECTION("filled object")
+            {
+                json j = {{"one", 1}, {"two", 2}, {"three", 3}};
+                const json j_const(j);
+
+                SECTION("result of empty")
+                {
+                    CHECK(j.empty() == false);
+                    CHECK(j_const.empty() == false);
+                }
+
+                SECTION("definition of empty")
+                {
+                    CHECK(j.empty() == (j.begin() == j.end()));
+                    CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+                }
+            }
+        }
+
+        SECTION("number (integer)")
+        {
+            json j = -23;
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == false);
+                CHECK(j_const.empty() == false);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u;
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == false);
+                CHECK(j_const.empty() == false);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+
+        SECTION("number (float)")
+        {
+            json j = 23.42;
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == false);
+                CHECK(j_const.empty() == false);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+
+        SECTION("null")
+        {
+            json j = nullptr;
+            const json j_const(j);
+
+            SECTION("result of empty")
+            {
+                CHECK(j.empty() == true);
+                CHECK(j_const.empty() == true);
+            }
+
+            SECTION("definition of empty")
+            {
+                CHECK(j.empty() == (j.begin() == j.end()));
+                CHECK(j_const.empty() == (j_const.begin() == j_const.end()));
+            }
+        }
+    }
+
+    SECTION("size()")
+    {
+        SECTION("boolean")
+        {
+            json j = true;
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 1);
+                CHECK(j_const.size() == 1);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+
+        SECTION("string")
+        {
+            json j = "hello world";
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 1);
+                CHECK(j_const.size() == 1);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+
+        SECTION("array")
+        {
+            SECTION("empty array")
+            {
+                json j = json::array();
+                const json j_const(j);
+
+                SECTION("result of size")
+                {
+                    CHECK(j.size() == 0);
+                    CHECK(j_const.size() == 0);
+                }
+
+                SECTION("definition of size")
+                {
+                    CHECK(std::distance(j.begin(), j.end()) == j.size());
+                    CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                    CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                    CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+                }
+            }
+
+            SECTION("filled array")
+            {
+                json j = {1, 2, 3};
+                const json j_const(j);
+
+                SECTION("result of size")
+                {
+                    CHECK(j.size() == 3);
+                    CHECK(j_const.size() == 3);
+                }
+
+                SECTION("definition of size")
+                {
+                    CHECK(std::distance(j.begin(), j.end()) == j.size());
+                    CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                    CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                    CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+                }
+            }
+        }
+
+        SECTION("object")
+        {
+            SECTION("empty object")
+            {
+                json j = json::object();
+                const json j_const(j);
+
+                SECTION("result of size")
+                {
+                    CHECK(j.size() == 0);
+                    CHECK(j_const.size() == 0);
+                }
+
+                SECTION("definition of size")
+                {
+                    CHECK(std::distance(j.begin(), j.end()) == j.size());
+                    CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                    CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                    CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+                }
+            }
+
+            SECTION("filled object")
+            {
+                json j = {{"one", 1}, {"two", 2}, {"three", 3}};
+                const json j_const(j);
+
+                SECTION("result of size")
+                {
+                    CHECK(j.size() == 3);
+                    CHECK(j_const.size() == 3);
+                }
+
+                SECTION("definition of size")
+                {
+                    CHECK(std::distance(j.begin(), j.end()) == j.size());
+                    CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                    CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                    CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+                }
+            }
+        }
+
+        SECTION("number (integer)")
+        {
+            json j = -23;
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 1);
+                CHECK(j_const.size() == 1);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u;
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 1);
+                CHECK(j_const.size() == 1);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+
+        SECTION("number (float)")
+        {
+            json j = 23.42;
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 1);
+                CHECK(j_const.size() == 1);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+
+        SECTION("null")
+        {
+            json j = nullptr;
+            const json j_const(j);
+
+            SECTION("result of size")
+            {
+                CHECK(j.size() == 0);
+                CHECK(j_const.size() == 0);
+            }
+
+            SECTION("definition of size")
+            {
+                CHECK(std::distance(j.begin(), j.end()) == j.size());
+                CHECK(std::distance(j_const.begin(), j_const.end()) == j_const.size());
+                CHECK(std::distance(j.rbegin(), j.rend()) == j.size());
+                CHECK(std::distance(j_const.crbegin(), j_const.crend()) == j_const.size());
+            }
+        }
+    }
+
+    SECTION("max_size()")
+    {
+        SECTION("boolean")
+        {
+            json j = true;
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("string")
+        {
+            json j = "hello world";
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("array")
+        {
+            SECTION("empty array")
+            {
+                json j = json::array();
+                const json j_const(j);
+
+                SECTION("result of max_size")
+                {
+                    CHECK(j.max_size() >= j.size());
+                    CHECK(j_const.max_size() >= j_const.size());
+                }
+            }
+
+            SECTION("filled array")
+            {
+                json j = {1, 2, 3};
+                const json j_const(j);
+
+                SECTION("result of max_size")
+                {
+                    CHECK(j.max_size() >= j.size());
+                    CHECK(j_const.max_size() >= j_const.size());
+                }
+            }
+        }
+
+        SECTION("object")
+        {
+            SECTION("empty object")
+            {
+                json j = json::object();
+                const json j_const(j);
+
+                SECTION("result of max_size")
+                {
+                    CHECK(j.max_size() >= j.size());
+                    CHECK(j_const.max_size() >= j_const.size());
+                }
+            }
+
+            SECTION("filled object")
+            {
+                json j = {{"one", 1}, {"two", 2}, {"three", 3}};
+                const json j_const(j);
+
+                SECTION("result of max_size")
+                {
+                    CHECK(j.max_size() >= j.size());
+                    CHECK(j_const.max_size() >= j_const.size());
+                }
+            }
+        }
+
+        SECTION("number (integer)")
+        {
+            json j = -23;
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u;
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("number (float)")
+        {
+            json j = 23.42;
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("null")
+        {
+            json j = nullptr;
+            const json j_const(j);
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 0);
+                CHECK(j_const.max_size() == 0);
+            }
+        }
+    }
+}

vendor/json/test/src/unit-class_const_iterator.cpp

@@ -0,0 +1,418 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("const_iterator class")
+{
+    SECTION("construction")
+    {
+        SECTION("constructor")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it(&j);
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::const_iterator it(&j);
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::const_iterator it(&j);
+            }
+        }
+
+        SECTION("copy assignment")
+        {
+            json j(json::value_t::null);
+            json::const_iterator it(&j);
+            json::const_iterator it2(&j);
+            it2 = it;
+        }
+
+        SECTION("copy constructor from non-const iterator")
+        {
+            SECTION("create from uninitialized iterator")
+            {
+                const json::iterator it {};
+                json::const_iterator cit(it);
+            }
+
+            SECTION("create from initialized iterator")
+            {
+                json j;
+                const json::iterator it = j.begin();
+                json::const_iterator cit(it);
+            }
+        }
+    }
+
+    SECTION("initialization")
+    {
+        SECTION("set_begin")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+        }
+
+        SECTION("set_end")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it(&j);
+                it.set_end();
+                CHECK((it == j.cend()));
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::const_iterator it(&j);
+                it.set_end();
+                CHECK((it == j.cend()));
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::const_iterator it(&j);
+                it.set_end();
+                CHECK((it == j.cend()));
+            }
+        }
+    }
+
+    SECTION("element access")
+    {
+        SECTION("operator*")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cbegin();
+                CHECK_THROWS_AS(*it, json::invalid_iterator&);
+                CHECK_THROWS_WITH(*it, "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK(*it == json(17));
+                it = j.cend();
+                CHECK_THROWS_AS(*it, json::invalid_iterator&);
+                CHECK_THROWS_WITH(*it, "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK(*it == json("bar"));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK(*it == json(1));
+            }
+        }
+
+        SECTION("operator->")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cbegin();
+                CHECK_THROWS_AS(std::string(it->type_name()), json::invalid_iterator&);
+                CHECK_THROWS_WITH(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "number");
+                it = j.cend();
+                CHECK_THROWS_AS(std::string(it->type_name()), json::invalid_iterator&);
+                CHECK_THROWS_WITH(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "string");
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "number");
+            }
+        }
+    }
+
+    SECTION("increment/decrement")
+    {
+        SECTION("post-increment")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+                it++;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-increment")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+                ++it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("post-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it--;
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                it--;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+                it--;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                --it;
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                --it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+                --it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+            }
+        }
+    }
+}

vendor/json/test/src/unit-class_iterator.cpp

@@ -0,0 +1,402 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("iterator class")
+{
+    SECTION("construction")
+    {
+        SECTION("constructor")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it(&j);
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::iterator it(&j);
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::iterator it(&j);
+            }
+        }
+
+        SECTION("copy assignment")
+        {
+            json j(json::value_t::null);
+            json::iterator it(&j);
+            json::iterator it2(&j);
+            it2 = it;
+        }
+    }
+
+    SECTION("initialization")
+    {
+        SECTION("set_begin")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.begin()));
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.begin()));
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.begin()));
+            }
+        }
+
+        SECTION("set_end")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it(&j);
+                it.set_end();
+                CHECK((it == j.end()));
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::iterator it(&j);
+                it.set_end();
+                CHECK((it == j.end()));
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::iterator it(&j);
+                it.set_end();
+                CHECK((it == j.end()));
+            }
+        }
+    }
+
+    SECTION("element access")
+    {
+        SECTION("operator*")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.begin();
+                CHECK_THROWS_AS(*it, json::invalid_iterator&);
+                CHECK_THROWS_WITH(*it, "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK(*it == json(17));
+                it = j.end();
+                CHECK_THROWS_AS(*it, json::invalid_iterator&);
+                CHECK_THROWS_WITH(*it, "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.begin();
+                CHECK(*it == json("bar"));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.begin();
+                CHECK(*it == json(1));
+            }
+        }
+
+        SECTION("operator->")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.begin();
+                CHECK_THROWS_AS(std::string(it->type_name()), json::invalid_iterator&);
+                CHECK_THROWS_WITH(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK(std::string(it->type_name()) == "number");
+                it = j.end();
+                CHECK_THROWS_AS(std::string(it->type_name()), json::invalid_iterator&);
+                CHECK_THROWS_WITH(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value");
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.begin();
+                CHECK(std::string(it->type_name()) == "string");
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.begin();
+                CHECK(std::string(it->type_name()) == "number");
+            }
+        }
+    }
+
+    SECTION("increment/decrement")
+    {
+        SECTION("post-increment")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.begin();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it++;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.begin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+                it++;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.begin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-increment")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.begin();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                ++it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.begin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+                ++it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.begin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("post-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.end();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.end();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                it--;
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                it--;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.end();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+                it--;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.end();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator it = j.end();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.end();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+                --it;
+                CHECK((it.m_it.primitive_iterator.m_it == 0));
+                --it;
+                CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator it = j.end();
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->end()));
+                --it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator it = j.end();
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator == it.m_object->m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_value.array->end()));
+            }
+        }
+    }
+}

vendor/json/test/src/unit-class_lexer.cpp

@@ -0,0 +1,247 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+namespace
+{
+// shortcut to scan a string literal
+json::lexer::token_type scan_string(const char* s, const bool ignore_comments = false);
+json::lexer::token_type scan_string(const char* s, const bool ignore_comments)
+{
+    auto ia = nlohmann::detail::input_adapter(s);
+    return nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments).scan();
+}
+}
+
+std::string get_error_message(const char* s, const bool ignore_comments = false);
+std::string get_error_message(const char* s, const bool ignore_comments)
+{
+    auto ia = nlohmann::detail::input_adapter(s);
+    auto lexer = nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments);
+    lexer.scan();
+    return lexer.get_error_message();
+}
+
+TEST_CASE("lexer class")
+{
+    SECTION("scan")
+    {
+        SECTION("structural characters")
+        {
+            CHECK((scan_string("[") == json::lexer::token_type::begin_array));
+            CHECK((scan_string("]") == json::lexer::token_type::end_array));
+            CHECK((scan_string("{") == json::lexer::token_type::begin_object));
+            CHECK((scan_string("}") == json::lexer::token_type::end_object));
+            CHECK((scan_string(",") == json::lexer::token_type::value_separator));
+            CHECK((scan_string(":") == json::lexer::token_type::name_separator));
+        }
+
+        SECTION("literal names")
+        {
+            CHECK((scan_string("null") == json::lexer::token_type::literal_null));
+            CHECK((scan_string("true") == json::lexer::token_type::literal_true));
+            CHECK((scan_string("false") == json::lexer::token_type::literal_false));
+        }
+
+        SECTION("numbers")
+        {
+            CHECK((scan_string("0") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("1") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("2") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("3") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("4") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("5") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("6") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("7") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("8") == json::lexer::token_type::value_unsigned));
+            CHECK((scan_string("9") == json::lexer::token_type::value_unsigned));
+
+            CHECK((scan_string("-0") == json::lexer::token_type::value_integer));
+            CHECK((scan_string("-1") == json::lexer::token_type::value_integer));
+
+            CHECK((scan_string("1.1") == json::lexer::token_type::value_float));
+            CHECK((scan_string("-1.1") == json::lexer::token_type::value_float));
+            CHECK((scan_string("1E10") == json::lexer::token_type::value_float));
+        }
+
+        SECTION("whitespace")
+        {
+            // result is end_of_input, because not token is following
+            CHECK((scan_string(" ") == json::lexer::token_type::end_of_input));
+            CHECK((scan_string("\t") == json::lexer::token_type::end_of_input));
+            CHECK((scan_string("\n") == json::lexer::token_type::end_of_input));
+            CHECK((scan_string("\r") == json::lexer::token_type::end_of_input));
+            CHECK((scan_string(" \t\n\r\n\t ") == json::lexer::token_type::end_of_input));
+        }
+    }
+
+    SECTION("token_type_name")
+    {
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::uninitialized)) == "<uninitialized>"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_true)) == "true literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_false)) == "false literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_null)) == "null literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_string)) == "string literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_unsigned)) == "number literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_integer)) == "number literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_float)) == "number literal"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::begin_array)) == "'['"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::begin_object)) == "'{'"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_array)) == "']'"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_object)) == "'}'"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::name_separator)) == "':'"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_separator)) == "','"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::parse_error)) == "<parse error>"));
+        CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_of_input)) == "end of input"));
+    }
+
+    SECTION("parse errors on first character")
+    {
+        for (int c = 1; c < 128; ++c)
+        {
+            // create string from the ASCII code
+            const auto s = std::string(1, static_cast<char>(c));
+            // store scan() result
+            const auto res = scan_string(s.c_str());
+
+            CAPTURE(s)
+
+            switch (c)
+            {
+                // single characters that are valid tokens
+                case ('['):
+                case (']'):
+                case ('{'):
+                case ('}'):
+                case (','):
+                case (':'):
+                case ('0'):
+                case ('1'):
+                case ('2'):
+                case ('3'):
+                case ('4'):
+                case ('5'):
+                case ('6'):
+                case ('7'):
+                case ('8'):
+                case ('9'):
+                {
+                    CHECK((res != json::lexer::token_type::parse_error));
+                    break;
+                }
+
+                // whitespace
+                case (' '):
+                case ('\t'):
+                case ('\n'):
+                case ('\r'):
+                {
+                    CHECK((res == json::lexer::token_type::end_of_input));
+                    break;
+                }
+
+                // anything else is not expected
+                default:
+                {
+                    CHECK((res == json::lexer::token_type::parse_error));
+                    break;
+                }
+            }
+        }
+    }
+
+    SECTION("very large string")
+    {
+        // strings larger than 1024 bytes yield a resize of the lexer's yytext buffer
+        std::string s("\"");
+        s += std::string(2048, 'x');
+        s += "\"";
+        CHECK((scan_string(s.c_str()) == json::lexer::token_type::value_string));
+    }
+
+    SECTION("fail on comments")
+    {
+        CHECK((scan_string("/", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/", false) == "invalid literal");
+
+        CHECK((scan_string("/!", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/!", false) == "invalid literal");
+        CHECK((scan_string("/*", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/*", false) == "invalid literal");
+        CHECK((scan_string("/**", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/**", false) == "invalid literal");
+
+        CHECK((scan_string("//", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("//", false) == "invalid literal");
+        CHECK((scan_string("/**/", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/**/", false) == "invalid literal");
+        CHECK((scan_string("/** /", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/** /", false) == "invalid literal");
+
+        CHECK((scan_string("/***/", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/***/", false) == "invalid literal");
+        CHECK((scan_string("/* true */", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/* true */", false) == "invalid literal");
+        CHECK((scan_string("/*/**/", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/*/**/", false) == "invalid literal");
+        CHECK((scan_string("/*/* */", false) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/*/* */", false) == "invalid literal");
+    }
+
+    SECTION("ignore comments")
+    {
+        CHECK((scan_string("/", true) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/", true) == "invalid comment; expecting '/' or '*' after '/'");
+
+        CHECK((scan_string("/!", true) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/!", true) == "invalid comment; expecting '/' or '*' after '/'");
+        CHECK((scan_string("/*", true) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/*", true) == "invalid comment; missing closing '*/'");
+        CHECK((scan_string("/**", true) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/**", true) == "invalid comment; missing closing '*/'");
+
+        CHECK((scan_string("//", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/**/", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/** /", true) == json::lexer::token_type::parse_error));
+        CHECK(get_error_message("/** /", true) == "invalid comment; missing closing '*/'");
+
+        CHECK((scan_string("/***/", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/* true */", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/*/**/", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/*/* */", true) == json::lexer::token_type::end_of_input));
+
+        CHECK((scan_string("//\n//\n", true) == json::lexer::token_type::end_of_input));
+        CHECK((scan_string("/**//**//**/", true) == json::lexer::token_type::end_of_input));
+    }
+}

vendor/json/test/src/unit-comparison.cpp

@@ -0,0 +1,270 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+namespace
+{
+// helper function to check std::less<json::value_t>
+// see https://en.cppreference.com/w/cpp/utility/functional/less
+template <typename A, typename B, typename U = std::less<json::value_t>>
+bool f(A a, B b, U u = U())
+{
+    return u(a, b);
+}
+}
+
+TEST_CASE("lexicographical comparison operators")
+{
+    SECTION("types")
+    {
+        std::vector<json::value_t> j_types =
+        {
+            json::value_t::null,
+            json::value_t::boolean,
+            json::value_t::number_integer,
+            json::value_t::number_unsigned,
+            json::value_t::number_float,
+            json::value_t::object,
+            json::value_t::array,
+            json::value_t::string,
+            json::value_t::binary
+        };
+
+        SECTION("comparison: less")
+        {
+            std::vector<std::vector<bool>> expected =
+            {
+                {false, true, true, true, true, true, true, true, true},
+                {false, false, true, true, true, true, true, true, true},
+                {false, false, false, false, false, true, true, true, true},
+                {false, false, false, false, false, true, true, true, true},
+                {false, false, false, false, false, true, true, true, true},
+                {false, false, false, false, false, false, true, true, true},
+                {false, false, false, false, false, false, false, true, true},
+                {false, false, false, false, false, false, false, false, true},
+                {false, false, false, false, false, false, false, false, false}
+            };
+
+            for (size_t i = 0; i < j_types.size(); ++i)
+            {
+                for (size_t j = 0; j < j_types.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check precomputed values
+                    CHECK(operator<(j_types[i], j_types[j]) == expected[i][j]);
+                    CHECK(f(j_types[i], j_types[j]) == expected[i][j]);
+                }
+            }
+        }
+    }
+
+    SECTION("values")
+    {
+        json j_values =
+        {
+            nullptr, nullptr,
+            -17, 42,
+            8u, 13u,
+            3.14159, 23.42,
+            "foo", "bar",
+            true, false,
+            {1, 2, 3}, {"one", "two", "three"},
+            {{"first", 1}, {"second", 2}}, {{"a", "A"}, {"b", {"B"}}},
+            json::binary({1, 2, 3}), json::binary({1, 2, 4})
+        };
+
+        SECTION("comparison: equal")
+        {
+            std::vector<std::vector<bool>> expected =
+            {
+                {true, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false},
+                {true, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, true, false, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, true, false, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, true, false, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, true, false, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, true, false, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true, false, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true, false},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true}
+            };
+
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CAPTURE(j_values[i])
+                    CAPTURE(j_values[j])
+                    // check precomputed values
+                    CHECK( (j_values[i] == j_values[j]) == expected[i][j] );
+                }
+            }
+
+            // comparison with discarded elements
+            json j_discarded(json::value_t::discarded);
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                CHECK( (j_values[i] == j_discarded) == false);
+                CHECK( (j_discarded == j_values[i]) == false);
+                CHECK( (j_discarded == j_discarded) == false);
+            }
+
+            // compare with null pointer
+            json j_null;
+            CHECK(j_null == nullptr);
+            CHECK(nullptr == j_null);
+        }
+
+        SECTION("comparison: not equal")
+        {
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check definition
+                    CHECK( (j_values[i] != j_values[j]) == !(j_values[i] == j_values[j]) );
+                }
+            }
+
+            // compare with null pointer
+            json j_null;
+            CHECK( (j_null != nullptr) == false);
+            CHECK( (nullptr != j_null) == false);
+            CHECK( (j_null != nullptr) == !(j_null == nullptr));
+            CHECK( (nullptr != j_null) == !(nullptr == j_null));
+        }
+
+        SECTION("comparison: less")
+        {
+            std::vector<std::vector<bool>> expected =
+            {
+                {false, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true},
+                {false, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true},
+                {false, false, false, true, true, true, true, true, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, false, false, false, false, false, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, true, false, true, false, true, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, true, false, false, false, true, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, true, true, true, false, true, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, true, false, false, false, false, true, true, false, false, true, true, true, true, true, true},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true, true},
+                {false, false, false, false, false, false, false, false, true, false, false, false, false, false, false, false, true, true},
+                {false, false, true, true, true, true, true, true, true, true, false, false, true, true, true, true, true, true},
+                {false, false, true, true, true, true, true, true, true, true, true, false, true, true, true, true, true, true},
+                {false, false, false, false, false, false, false, false, true, true, false, false, false, true, false, false, true, true},
+                {false, false, false, false, false, false, false, false, true, true, false, false, false, false, false, false, true, true},
+                {false, false, false, false, false, false, false, false, true, true, false, false, true, true, false, false, true, true},
+                {false, false, false, false, false, false, false, false, true, true, false, false, true, true, true, false, true, true},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true},
+                {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false}
+            };
+
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CAPTURE(j_values[i])
+                    CAPTURE(j_values[j])
+                    // check precomputed values
+                    CHECK( (j_values[i] < j_values[j]) == expected[i][j] );
+                }
+            }
+
+            // comparison with discarded elements
+            json j_discarded(json::value_t::discarded);
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                CAPTURE(i)
+                CHECK( (j_values[i] < j_discarded) == false);
+                CHECK( (j_discarded < j_values[i]) == false);
+                CHECK( (j_discarded < j_discarded) == false);
+            }
+        }
+
+        SECTION("comparison: less than or equal equal")
+        {
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check definition
+                    CHECK( (j_values[i] <= j_values[j]) == !(j_values[j] < j_values[i]) );
+                }
+            }
+        }
+
+        SECTION("comparison: greater than")
+        {
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check definition
+                    CHECK( (j_values[i] > j_values[j]) == (j_values[j] < j_values[i]) );
+                }
+            }
+        }
+
+        SECTION("comparison: greater than or equal")
+        {
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check definition
+                    CHECK( (j_values[i] >= j_values[j]) == !(j_values[i] < j_values[j]) );
+                }
+            }
+        }
+    }
+}

vendor/json/test/src/unit-concepts.cpp

@@ -0,0 +1,171 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("concepts")
+{
+    SECTION("container requirements for json")
+    {
+        // X: container class: json
+        // T: type of objects: json
+        // a, b: values of type X: json
+
+        // TABLE 96 - Container Requirements
+
+        // X::value_type must return T
+        CHECK((std::is_same<json::value_type, json>::value));
+
+        // X::reference must return lvalue of T
+        CHECK((std::is_same<json::reference, json&>::value));
+
+        // X::const_reference must return const lvalue of T
+        CHECK((std::is_same<json::const_reference, const json&>::value));
+
+        // X::iterator must return iterator whose value_type is T
+        CHECK((std::is_same<json::iterator::value_type, json>::value));
+        // X::iterator must meet the forward iterator requirements
+        CHECK((std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<json::iterator>::iterator_category>::value));
+        // X::iterator must be convertible to X::const_iterator
+        CHECK((std::is_convertible<json::iterator, json::const_iterator>::value));
+
+        // X::const_iterator must return iterator whose value_type is T
+        CHECK((std::is_same<json::const_iterator::value_type, json>::value));
+        // X::const_iterator must meet the forward iterator requirements
+        CHECK((std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<json::const_iterator>::iterator_category>::value));
+
+        // X::difference_type must return a signed integer
+        CHECK((std::is_signed<json::difference_type>::value));
+        // X::difference_type must be identical to X::iterator::difference_type
+        CHECK((std::is_same<json::difference_type, json::iterator::difference_type>::value));
+        // X::difference_type must be identical to X::const_iterator::difference_type
+        CHECK((std::is_same<json::difference_type, json::const_iterator::difference_type>::value));
+
+        // X::size_type must return an unsigned integer
+        CHECK((std::is_unsigned<json::size_type>::value));
+        // X::size_type can represent any non-negative value of X::difference_type
+        CHECK(static_cast<json::size_type>((std::numeric_limits<json::difference_type>::max)()) <=
+              (std::numeric_limits<json::size_type>::max)());
+
+        // the expression "X u" has the post-condition "u.empty()"
+        {
+            json u;
+            CHECK(u.empty());
+        }
+
+        // the expression "X()" has the post-condition "X().empty()"
+        CHECK(json().empty());
+    }
+
+    SECTION("class json")
+    {
+        SECTION("DefaultConstructible")
+        {
+            CHECK(std::is_nothrow_default_constructible<json>::value);
+        }
+
+        SECTION("MoveConstructible")
+        {
+            CHECK(std::is_move_constructible<json>::value);
+            CHECK(std::is_nothrow_move_constructible<json>::value);
+        }
+
+        SECTION("CopyConstructible")
+        {
+            CHECK(std::is_copy_constructible<json>::value);
+        }
+
+        SECTION("MoveAssignable")
+        {
+            CHECK(std::is_nothrow_move_assignable<json>::value);
+        }
+
+        SECTION("CopyAssignable")
+        {
+            CHECK(std::is_copy_assignable<json>::value);
+        }
+
+        SECTION("Destructible")
+        {
+            CHECK(std::is_nothrow_destructible<json>::value);
+        }
+
+        SECTION("StandardLayoutType")
+        {
+            CHECK(std::is_standard_layout<json>::value);
+        }
+    }
+
+    SECTION("class iterator")
+    {
+        SECTION("CopyConstructible")
+        {
+            CHECK(std::is_nothrow_copy_constructible<json::iterator>::value);
+            CHECK(std::is_nothrow_copy_constructible<json::const_iterator>::value);
+        }
+
+        SECTION("CopyAssignable")
+        {
+            // STL iterators used by json::iterator don't pass this test in Debug mode
+#if !defined(_MSC_VER) || (_ITERATOR_DEBUG_LEVEL == 0)
+            CHECK(std::is_nothrow_copy_assignable<json::iterator>::value);
+            CHECK(std::is_nothrow_copy_assignable<json::const_iterator>::value);
+#endif
+        }
+
+        SECTION("Destructible")
+        {
+            CHECK(std::is_nothrow_destructible<json::iterator>::value);
+            CHECK(std::is_nothrow_destructible<json::const_iterator>::value);
+        }
+
+        SECTION("Swappable")
+        {
+            {
+                json j {1, 2, 3};
+                json::iterator it1 = j.begin();
+                json::iterator it2 = j.end();
+                swap(it1, it2);
+                CHECK(it1 == j.end());
+                CHECK(it2 == j.begin());
+            }
+            {
+                json j {1, 2, 3};
+                json::const_iterator it1 = j.cbegin();
+                json::const_iterator it2 = j.cend();
+                swap(it1, it2);
+                CHECK(it1 == j.end());
+                CHECK(it2 == j.begin());
+            }
+        }
+    }
+}

vendor/json/test/src/unit-constructor2.cpp

@@ -0,0 +1,207 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("other constructors and destructor")
+{
+    SECTION("copy constructor")
+    {
+        SECTION("object")
+        {
+            json j {{"foo", 1}, {"bar", false}};
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("array")
+        {
+            json j {"foo", 1, 42.23, false};
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("null")
+        {
+            json j(nullptr);
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("boolean")
+        {
+            json j(true);
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("string")
+        {
+            json j("Hello world");
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("number (integer)")
+        {
+            json j(42);
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j(42u);
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j(42.23);
+            json k(j);
+            CHECK(j == k);
+        }
+
+        SECTION("binary")
+        {
+            json j = json::binary({1, 2, 3});
+            json k(j);
+            CHECK(j == k);
+        }
+    }
+
+    SECTION("move constructor")
+    {
+        json j {{"foo", "bar"}, {"baz", {1, 2, 3, 4}}, {"a", 42u}, {"b", 42.23}, {"c", nullptr}};
+        CHECK(j.type() == json::value_t::object);
+        json k(std::move(j));
+        CHECK(k.type() == json::value_t::object);
+        CHECK(j.type() == json::value_t::null);
+    }
+
+    SECTION("copy assignment")
+    {
+        SECTION("object")
+        {
+            json j {{"foo", 1}, {"bar", false}};
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("array")
+        {
+            json j {"foo", 1, 42.23, false};
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("null")
+        {
+            json j(nullptr);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("boolean")
+        {
+            json j(true);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("string")
+        {
+            json j("Hello world");
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (integer)")
+        {
+            json j(42);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j(42u);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j(42.23);
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+
+        SECTION("binary")
+        {
+            json j = json::binary({1, 2, 3});
+            json k;
+            k = j;
+            CHECK(j == k);
+        }
+    }
+
+    SECTION("destructor")
+    {
+        SECTION("object")
+        {
+            auto j = new json {{"foo", 1}, {"bar", false}};
+            delete j;
+        }
+
+        SECTION("array")
+        {
+            auto j = new json {"foo", 1, 1u, false, 23.42};
+            delete j;
+        }
+
+        SECTION("string")
+        {
+            auto j = new json("Hello world");
+            delete j;
+        }
+    }
+}

vendor/json/test/src/unit-convenience.cpp

@@ -0,0 +1,117 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <sstream>
+
+namespace
+{
+void check_escaped(const char* original, const char* escaped = "", const bool ensure_ascii = false);
+void check_escaped(const char* original, const char* escaped, const bool ensure_ascii)
+{
+    std::stringstream ss;
+    json::serializer s(nlohmann::detail::output_adapter<char>(ss), ' ');
+    s.dump_escaped(original, ensure_ascii);
+    CHECK(ss.str() == escaped);
+}
+}
+
+TEST_CASE("convenience functions")
+{
+    SECTION("type name as string")
+    {
+        CHECK(std::string(json(json::value_t::null).type_name()) == "null");
+        CHECK(std::string(json(json::value_t::object).type_name()) == "object");
+        CHECK(std::string(json(json::value_t::array).type_name()) == "array");
+        CHECK(std::string(json(json::value_t::number_integer).type_name()) == "number");
+        CHECK(std::string(json(json::value_t::number_unsigned).type_name()) == "number");
+        CHECK(std::string(json(json::value_t::number_float).type_name()) == "number");
+        CHECK(std::string(json(json::value_t::binary).type_name()) == "binary");
+        CHECK(std::string(json(json::value_t::boolean).type_name()) == "boolean");
+        CHECK(std::string(json(json::value_t::string).type_name()) == "string");
+        CHECK(std::string(json(json::value_t::discarded).type_name()) == "discarded");
+    }
+
+    SECTION("string escape")
+    {
+        check_escaped("\"", "\\\"");
+        check_escaped("\\", "\\\\");
+        check_escaped("\b", "\\b");
+        check_escaped("\f", "\\f");
+        check_escaped("\n", "\\n");
+        check_escaped("\r", "\\r");
+        check_escaped("\t", "\\t");
+
+        check_escaped("\x01", "\\u0001");
+        check_escaped("\x02", "\\u0002");
+        check_escaped("\x03", "\\u0003");
+        check_escaped("\x04", "\\u0004");
+        check_escaped("\x05", "\\u0005");
+        check_escaped("\x06", "\\u0006");
+        check_escaped("\x07", "\\u0007");
+        check_escaped("\x08", "\\b");
+        check_escaped("\x09", "\\t");
+        check_escaped("\x0a", "\\n");
+        check_escaped("\x0b", "\\u000b");
+        check_escaped("\x0c", "\\f");
+        check_escaped("\x0d", "\\r");
+        check_escaped("\x0e", "\\u000e");
+        check_escaped("\x0f", "\\u000f");
+        check_escaped("\x10", "\\u0010");
+        check_escaped("\x11", "\\u0011");
+        check_escaped("\x12", "\\u0012");
+        check_escaped("\x13", "\\u0013");
+        check_escaped("\x14", "\\u0014");
+        check_escaped("\x15", "\\u0015");
+        check_escaped("\x16", "\\u0016");
+        check_escaped("\x17", "\\u0017");
+        check_escaped("\x18", "\\u0018");
+        check_escaped("\x19", "\\u0019");
+        check_escaped("\x1a", "\\u001a");
+        check_escaped("\x1b", "\\u001b");
+        check_escaped("\x1c", "\\u001c");
+        check_escaped("\x1d", "\\u001d");
+        check_escaped("\x1e", "\\u001e");
+        check_escaped("\x1f", "\\u001f");
+
+        // invalid UTF-8 characters
+        CHECK_THROWS_AS(check_escaped("ä\xA9ü"), json::type_error&);
+        CHECK_THROWS_WITH(check_escaped("ä\xA9ü"),
+                          "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9");
+
+        CHECK_THROWS_AS(check_escaped("\xC2"), json::type_error&);
+        CHECK_THROWS_WITH(check_escaped("\xC2"),
+                          "[json.exception.type_error.316] incomplete UTF-8 string; last byte: 0xC2");
+    }
+}

vendor/json/test/src/unit-diagnostics.cpp

@@ -0,0 +1,111 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#ifdef JSON_DIAGNOSTICS
+    #undef JSON_DIAGNOSTICS
+#endif
+
+#define JSON_DIAGNOSTICS 1
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("Better diagnostics")
+{
+    SECTION("empty JSON Pointer")
+    {
+        json j = 1;
+        std::string s;
+        CHECK_THROWS_WITH_AS(s = j.get<std::string>(), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
+    }
+
+    SECTION("invalid type")
+    {
+        json j;
+        j["a"]["b"]["c"] = 1;
+        std::string s;
+        CHECK_THROWS_WITH_AS(s = j["a"]["b"]["c"].get<std::string>(), "[json.exception.type_error.302] (/a/b/c) type must be string, but is number", json::type_error);
+    }
+
+    SECTION("missing key")
+    {
+        json j;
+        j["object"]["object"] = true;
+        CHECK_THROWS_WITH_AS(j["object"].at("not_found"), "[json.exception.out_of_range.403] (/object) key 'not_found' not found", json::out_of_range);
+    }
+
+    SECTION("array index out of range")
+    {
+        json j;
+        j["array"][4] = true;
+        CHECK_THROWS_WITH_AS(j["array"].at(5), "[json.exception.out_of_range.401] (/array) array index 5 is out of range", json::out_of_range);
+    }
+
+    SECTION("array index at wrong type")
+    {
+        json j;
+        j["array"][4] = true;
+        CHECK_THROWS_WITH_AS(j["array"][4][5], "[json.exception.type_error.305] (/array/4) cannot use operator[] with a numeric argument with boolean", json::type_error);
+    }
+
+    SECTION("wrong iterator")
+    {
+        json j;
+        j["array"] = json::array();
+        CHECK_THROWS_WITH_AS(j["array"].erase(j.begin()), "[json.exception.invalid_iterator.202] (/array) iterator does not fit current value", json::invalid_iterator);
+    }
+
+    SECTION("JSON Pointer escaping")
+    {
+        json j;
+        j["a/b"]["m~n"] = 1;
+        std::string s;
+        CHECK_THROWS_WITH_AS(s = j["a/b"]["m~n"].get<std::string>(), "[json.exception.type_error.302] (/a~1b/m~0n) type must be string, but is number", json::type_error);
+    }
+
+    SECTION("Parse error")
+    {
+        CHECK_THROWS_WITH_AS(json::parse(""), "[json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal", json::parse_error);
+    }
+
+    SECTION("Regression test for https://github.com/nlohmann/json/pull/2562#pullrequestreview-574858448")
+    {
+        CHECK_THROWS_WITH_AS(json({"0", "0"})[1].get<int>(), "[json.exception.type_error.302] (/1) type must be number, but is string", json::type_error);
+        CHECK_THROWS_WITH_AS(json({"0", "1"})[1].get<int>(), "[json.exception.type_error.302] (/1) type must be number, but is string", json::type_error);
+    }
+
+    SECTION("Regression test for https://github.com/nlohmann/json/pull/2562/files/380a613f2b5d32425021129cd1f371ddcfd54ddf#r563259793")
+    {
+        json j;
+        j["/foo"] = {1, 2, 3};
+        CHECK_THROWS_WITH_AS(j.unflatten(), "[json.exception.type_error.315] (/~1foo) values in object must be primitive", json::type_error);
+    }
+}

vendor/json/test/src/unit-hash.cpp

@@ -0,0 +1,84 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+#include <set>
+
+TEST_CASE("hash")
+{
+    // Collect hashes for different JSON values and make sure that they are distinct
+    // We cannot compare against fixed values, because the implementation of
+    // std::hash may differ between compilers.
+
+    std::set<std::size_t> hashes;
+
+    // null
+    hashes.insert(std::hash<json> {}(json(nullptr)));
+
+    // boolean
+    hashes.insert(std::hash<json> {}(json(true)));
+    hashes.insert(std::hash<json> {}(json(false)));
+
+    // string
+    hashes.insert(std::hash<json> {}(json("")));
+    hashes.insert(std::hash<json> {}(json("foo")));
+
+    // number
+    hashes.insert(std::hash<json> {}(json(0)));
+    hashes.insert(std::hash<json> {}(json(unsigned(0))));
+
+    hashes.insert(std::hash<json> {}(json(-1)));
+    hashes.insert(std::hash<json> {}(json(0.0)));
+    hashes.insert(std::hash<json> {}(json(42.23)));
+
+    // array
+    hashes.insert(std::hash<json> {}(json::array()));
+    hashes.insert(std::hash<json> {}(json::array({1, 2, 3})));
+
+    // object
+    hashes.insert(std::hash<json> {}(json::object()));
+    hashes.insert(std::hash<json> {}(json::object({{"foo", "bar"}})));
+
+    // binary
+    hashes.insert(std::hash<json> {}(json::binary({})));
+    hashes.insert(std::hash<json> {}(json::binary({}, 0)));
+    hashes.insert(std::hash<json> {}(json::binary({}, 42)));
+    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3})));
+    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 0)));
+    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 42)));
+
+    // discarded
+    hashes.insert(std::hash<json> {}(json(json::value_t::discarded)));
+
+    CHECK(hashes.size() == 21);
+}

vendor/json/test/src/unit-inspection.cpp

@@ -0,0 +1,480 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <fstream>
+#include <sstream>
+#include <test_data.hpp>
+
+TEST_CASE("object inspection")
+{
+    SECTION("convenience type checker")
+    {
+        SECTION("object")
+        {
+            json j {{"foo", 1}, {"bar", false}};
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(!j.is_primitive());
+            CHECK(j.is_structured());
+        }
+
+        SECTION("array")
+        {
+            json j {"foo", 1, 1u, 42.23, false};
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(!j.is_primitive());
+            CHECK(j.is_structured());
+        }
+
+        SECTION("null")
+        {
+            json j(nullptr);
+            CHECK(j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("boolean")
+        {
+            json j(true);
+            CHECK(!j.is_null());
+            CHECK(j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("string")
+        {
+            json j("Hello world");
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("number (integer)")
+        {
+            json j(42);
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(j.is_number());
+            CHECK(j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j(42u);
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(j.is_number());
+            CHECK(j.is_number_integer());
+            CHECK(j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j(42.23);
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("binary")
+        {
+            json j(json::value_t::binary);
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(!j.is_discarded());
+            CHECK(j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+
+        SECTION("discarded")
+        {
+            json j(json::value_t::discarded);
+            CHECK(!j.is_null());
+            CHECK(!j.is_boolean());
+            CHECK(!j.is_number());
+            CHECK(!j.is_number_integer());
+            CHECK(!j.is_number_unsigned());
+            CHECK(!j.is_number_float());
+            CHECK(!j.is_binary());
+            CHECK(!j.is_object());
+            CHECK(!j.is_array());
+            CHECK(!j.is_string());
+            CHECK(j.is_discarded());
+            CHECK(!j.is_primitive());
+            CHECK(!j.is_structured());
+        }
+    }
+
+    SECTION("serialization")
+    {
+        json j {{"object", json::object()}, {"array", {1, 2, 3, 4}}, {"number", 42}, {"boolean", false}, {"null", nullptr}, {"string", "Hello world"} };
+
+        SECTION("no indent / indent=-1")
+        {
+            CHECK(j.dump() ==
+                  "{\"array\":[1,2,3,4],\"boolean\":false,\"null\":null,\"number\":42,\"object\":{},\"string\":\"Hello world\"}");
+
+            CHECK(j.dump() == j.dump(-1));
+        }
+
+        SECTION("indent=0")
+        {
+            CHECK(j.dump(0) ==
+                  "{\n\"array\": [\n1,\n2,\n3,\n4\n],\n\"boolean\": false,\n\"null\": null,\n\"number\": 42,\n\"object\": {},\n\"string\": \"Hello world\"\n}");
+        }
+
+        SECTION("indent=1, space='\t'")
+        {
+            CHECK(j.dump(1, '\t') ==
+                  "{\n\t\"array\": [\n\t\t1,\n\t\t2,\n\t\t3,\n\t\t4\n\t],\n\t\"boolean\": false,\n\t\"null\": null,\n\t\"number\": 42,\n\t\"object\": {},\n\t\"string\": \"Hello world\"\n}");
+        }
+
+        SECTION("indent=4")
+        {
+            CHECK(j.dump(4) ==
+                  "{\n    \"array\": [\n        1,\n        2,\n        3,\n        4\n    ],\n    \"boolean\": false,\n    \"null\": null,\n    \"number\": 42,\n    \"object\": {},\n    \"string\": \"Hello world\"\n}");
+        }
+
+        SECTION("indent=x")
+        {
+            CHECK(j.dump().size() == 94);
+            CHECK(j.dump(1).size() == 127);
+            CHECK(j.dump(2).size() == 142);
+            CHECK(j.dump(512).size() == 7792);
+
+            // important test, because it yields a resize of the indent_string
+            // inside the dump() function
+            CHECK(j.dump(1024).size() == 15472);
+
+            const auto binary = json::binary({1, 2, 3}, 128);
+            CHECK(binary.dump(1024).size() == 2086);
+        }
+
+        SECTION("dump and floating-point numbers")
+        {
+            auto s = json(42.23).dump();
+            CHECK(s.find("42.23") != std::string::npos);
+        }
+
+        SECTION("dump and small floating-point numbers")
+        {
+            auto s = json(1.23456e-78).dump();
+            CHECK(s.find("1.23456e-78") != std::string::npos);
+        }
+
+        SECTION("dump and non-ASCII characters")
+        {
+            CHECK(json("ä").dump() == "\"ä\"");
+            CHECK(json("Ö").dump() == "\"Ö\"");
+            CHECK(json("❤️").dump() == "\"❤️\"");
+        }
+
+        SECTION("dump with ensure_ascii and non-ASCII characters")
+        {
+            CHECK(json("ä").dump(-1, ' ', true) == "\"\\u00e4\"");
+            CHECK(json("Ö").dump(-1, ' ', true) == "\"\\u00d6\"");
+            CHECK(json("❤️").dump(-1, ' ', true) == "\"\\u2764\\ufe0f\"");
+        }
+
+        SECTION("full Unicode escaping to ASCII")
+        {
+            SECTION("parsing yields the same JSON value")
+            {
+                std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
+                std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");
+
+                json j1 = json::parse(f_escaped);
+                json j2 = json::parse(f_unescaped);
+                CHECK(j1 == j2);
+            }
+
+            SECTION("dumping yields the same JSON text")
+            {
+                std::ifstream f_escaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode_ascii.json");
+                std::ifstream f_unescaped(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json");
+
+                json value = json::parse(f_unescaped);
+                std::string text = value.dump(4, ' ', true);
+
+                std::string expected((std::istreambuf_iterator<char>(f_escaped)),
+                                     std::istreambuf_iterator<char>());
+                CHECK(text == expected);
+            }
+        }
+
+        SECTION("serialization of discarded element")
+        {
+            json j_discarded(json::value_t::discarded);
+            CHECK(j_discarded.dump() == "<discarded>");
+        }
+
+        SECTION("check that precision is reset after serialization")
+        {
+            // create stringstream and set precision
+            std::stringstream ss;
+            ss.precision(3);
+            ss << 3.141592653589793 << std::fixed;
+            CHECK(ss.str() == "3.14");
+
+            // reset stringstream
+            ss.str(std::string());
+
+            // use stringstream for JSON serialization
+            json j_number = 3.14159265358979;
+            ss << j_number;
+
+            // check that precision has been overridden during serialization
+            CHECK(ss.str() == "3.14159265358979");
+
+            // check that precision has been restored
+            CHECK(ss.precision() == 3);
+        }
+    }
+
+    SECTION("round trips")
+    {
+        for (const auto& s :
+                {"3.141592653589793", "1000000000000000010E5"
+                })
+        {
+            json j1 = json::parse(s);
+            std::string s1 = j1.dump();
+            json j2 = json::parse(s1);
+            std::string s2 = j2.dump();
+            CHECK(s1 == s2);
+        }
+    }
+
+    SECTION("return the type of the object (explicit)")
+    {
+        SECTION("null")
+        {
+            json j = nullptr;
+            CHECK(j.type() == json::value_t::null);
+        }
+
+        SECTION("object")
+        {
+            json j = {{"foo", "bar"}};
+            CHECK(j.type() == json::value_t::object);
+        }
+
+        SECTION("array")
+        {
+            json j = {1, 2, 3, 4};
+            CHECK(j.type() == json::value_t::array);
+        }
+
+        SECTION("boolean")
+        {
+            json j = true;
+            CHECK(j.type() == json::value_t::boolean);
+        }
+
+        SECTION("string")
+        {
+            json j = "Hello world";
+            CHECK(j.type() == json::value_t::string);
+        }
+
+        SECTION("number (integer)")
+        {
+            json j = 23;
+            CHECK(j.type() == json::value_t::number_integer);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u;
+            CHECK(j.type() == json::value_t::number_unsigned);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j = 42.23;
+            CHECK(j.type() == json::value_t::number_float);
+        }
+    }
+
+    SECTION("return the type of the object (implicit)")
+    {
+        SECTION("null")
+        {
+            json j = nullptr;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("object")
+        {
+            json j = {{"foo", "bar"}};
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("array")
+        {
+            json j = {1, 2, 3, 4};
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("boolean")
+        {
+            json j = true;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("string")
+        {
+            json j = "Hello world";
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (integer)")
+        {
+            json j = 23;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j = 42.23;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("binary")
+        {
+            json j = json::binary({});
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+    }
+}

vendor/json/test/src/unit-json_pointer.cpp

@@ -0,0 +1,697 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("JSON pointers")
+{
+    SECTION("errors")
+    {
+        CHECK_THROWS_AS(json::json_pointer("foo"), json::parse_error&);
+        CHECK_THROWS_WITH(json::json_pointer("foo"),
+                          "[json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'");
+
+        CHECK_THROWS_AS(json::json_pointer("/~~"), json::parse_error&);
+        CHECK_THROWS_WITH(json::json_pointer("/~~"),
+                          "[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'");
+
+        CHECK_THROWS_AS(json::json_pointer("/~"), json::parse_error&);
+        CHECK_THROWS_WITH(json::json_pointer("/~"),
+                          "[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'");
+
+        json::json_pointer p;
+        CHECK_THROWS_AS(p.top(), json::out_of_range&);
+        CHECK_THROWS_WITH(p.top(),
+                          "[json.exception.out_of_range.405] JSON pointer has no parent");
+        CHECK_THROWS_AS(p.pop_back(), json::out_of_range&);
+        CHECK_THROWS_WITH(p.pop_back(),
+                          "[json.exception.out_of_range.405] JSON pointer has no parent");
+
+        SECTION("array index error")
+        {
+            json v = {1, 2, 3, 4};
+            json::json_pointer ptr("/10e");
+            CHECK_THROWS_AS(v[ptr], json::out_of_range&);
+            CHECK_THROWS_WITH(v[ptr],
+                              "[json.exception.out_of_range.404] unresolved reference token '10e'");
+        }
+    }
+
+    SECTION("examples from RFC 6901")
+    {
+        SECTION("nonconst access")
+        {
+            json j = R"(
+            {
+                "foo": ["bar", "baz"],
+                "": 0,
+                "a/b": 1,
+                "c%d": 2,
+                "e^f": 3,
+                "g|h": 4,
+                "i\\j": 5,
+                "k\"l": 6,
+                " ": 7,
+                "m~n": 8
+            }
+            )"_json;
+
+            // the whole document
+            CHECK(j[json::json_pointer()] == j);
+            CHECK(j[json::json_pointer("")] == j);
+            CHECK(j.contains(json::json_pointer()));
+            CHECK(j.contains(json::json_pointer("")));
+
+            // array access
+            CHECK(j[json::json_pointer("/foo")] == j["foo"]);
+            CHECK(j.contains(json::json_pointer("/foo")));
+            CHECK(j[json::json_pointer("/foo/0")] == j["foo"][0]);
+            CHECK(j[json::json_pointer("/foo/1")] == j["foo"][1]);
+            CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
+            CHECK(j.contains(json::json_pointer("/foo/0")));
+            CHECK(j.contains(json::json_pointer("/foo/1")));
+            CHECK(!j.contains(json::json_pointer("/foo/3")));
+            CHECK(!j.contains(json::json_pointer("/foo/+")));
+            CHECK(!j.contains(json::json_pointer("/foo/1+2")));
+            CHECK(!j.contains(json::json_pointer("/foo/-")));
+
+            // checked array access
+            CHECK(j.at(json::json_pointer("/foo/0")) == j["foo"][0]);
+            CHECK(j.at(json::json_pointer("/foo/1")) == j["foo"][1]);
+
+            // empty string access
+            CHECK(j[json::json_pointer("/")] == j[""]);
+            CHECK(j.contains(json::json_pointer("")));
+            CHECK(j.contains(json::json_pointer("/")));
+
+            // other cases
+            CHECK(j[json::json_pointer("/ ")] == j[" "]);
+            CHECK(j[json::json_pointer("/c%d")] == j["c%d"]);
+            CHECK(j[json::json_pointer("/e^f")] == j["e^f"]);
+            CHECK(j[json::json_pointer("/g|h")] == j["g|h"]);
+            CHECK(j[json::json_pointer("/i\\j")] == j["i\\j"]);
+            CHECK(j[json::json_pointer("/k\"l")] == j["k\"l"]);
+
+            // contains
+            CHECK(j.contains(json::json_pointer("/ ")));
+            CHECK(j.contains(json::json_pointer("/c%d")));
+            CHECK(j.contains(json::json_pointer("/e^f")));
+            CHECK(j.contains(json::json_pointer("/g|h")));
+            CHECK(j.contains(json::json_pointer("/i\\j")));
+            CHECK(j.contains(json::json_pointer("/k\"l")));
+
+            // checked access
+            CHECK(j.at(json::json_pointer("/ ")) == j[" "]);
+            CHECK(j.at(json::json_pointer("/c%d")) == j["c%d"]);
+            CHECK(j.at(json::json_pointer("/e^f")) == j["e^f"]);
+            CHECK(j.at(json::json_pointer("/g|h")) == j["g|h"]);
+            CHECK(j.at(json::json_pointer("/i\\j")) == j["i\\j"]);
+            CHECK(j.at(json::json_pointer("/k\"l")) == j["k\"l"]);
+
+            // escaped access
+            CHECK(j[json::json_pointer("/a~1b")] == j["a/b"]);
+            CHECK(j[json::json_pointer("/m~0n")] == j["m~n"]);
+            CHECK(j.contains(json::json_pointer("/a~1b")));
+            CHECK(j.contains(json::json_pointer("/m~0n")));
+
+            // unescaped access
+            // access to nonexisting values yield object creation
+            CHECK(!j.contains(json::json_pointer("/a/b")));
+            CHECK_NOTHROW(j[json::json_pointer("/a/b")] = 42);
+            CHECK(j.contains(json::json_pointer("/a/b")));
+            CHECK(j["a"]["b"] == json(42));
+
+            CHECK(!j.contains(json::json_pointer("/a/c/1")));
+            CHECK_NOTHROW(j[json::json_pointer("/a/c/1")] = 42);
+            CHECK(j["a"]["c"] == json({nullptr, 42}));
+            CHECK(j.contains(json::json_pointer("/a/c/1")));
+
+            CHECK(!j.contains(json::json_pointer("/a/d/-")));
+            CHECK_NOTHROW(j[json::json_pointer("/a/d/-")] = 42);
+            CHECK(!j.contains(json::json_pointer("/a/d/-")));
+            CHECK(j["a"]["d"] == json::array({42}));
+            // "/a/b" works for JSON {"a": {"b": 42}}
+            CHECK(json({{"a", {{"b", 42}}}})[json::json_pointer("/a/b")] == json(42));
+
+            // unresolved access
+            json j_primitive = 1;
+            CHECK_THROWS_AS(j_primitive["/foo"_json_pointer], json::out_of_range&);
+            CHECK_THROWS_WITH(j_primitive["/foo"_json_pointer],
+                              "[json.exception.out_of_range.404] unresolved reference token 'foo'");
+            CHECK_THROWS_AS(j_primitive.at("/foo"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j_primitive.at("/foo"_json_pointer),
+                              "[json.exception.out_of_range.404] unresolved reference token 'foo'");
+            CHECK(!j_primitive.contains(json::json_pointer("/foo")));
+        }
+
+        SECTION("const access")
+        {
+            const json j = R"(
+            {
+                "foo": ["bar", "baz"],
+                "": 0,
+                "a/b": 1,
+                "c%d": 2,
+                "e^f": 3,
+                "g|h": 4,
+                "i\\j": 5,
+                "k\"l": 6,
+                " ": 7,
+                "m~n": 8
+            }
+            )"_json;
+
+            // the whole document
+            CHECK(j[json::json_pointer()] == j);
+            CHECK(j[json::json_pointer("")] == j);
+
+            // array access
+            CHECK(j[json::json_pointer("/foo")] == j["foo"]);
+            CHECK(j[json::json_pointer("/foo/0")] == j["foo"][0]);
+            CHECK(j[json::json_pointer("/foo/1")] == j["foo"][1]);
+            CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
+
+            // checked array access
+            CHECK(j.at(json::json_pointer("/foo/0")) == j["foo"][0]);
+            CHECK(j.at(json::json_pointer("/foo/1")) == j["foo"][1]);
+
+            // empty string access
+            CHECK(j[json::json_pointer("/")] == j[""]);
+
+            // other cases
+            CHECK(j[json::json_pointer("/ ")] == j[" "]);
+            CHECK(j[json::json_pointer("/c%d")] == j["c%d"]);
+            CHECK(j[json::json_pointer("/e^f")] == j["e^f"]);
+            CHECK(j[json::json_pointer("/g|h")] == j["g|h"]);
+            CHECK(j[json::json_pointer("/i\\j")] == j["i\\j"]);
+            CHECK(j[json::json_pointer("/k\"l")] == j["k\"l"]);
+
+            // checked access
+            CHECK(j.at(json::json_pointer("/ ")) == j[" "]);
+            CHECK(j.at(json::json_pointer("/c%d")) == j["c%d"]);
+            CHECK(j.at(json::json_pointer("/e^f")) == j["e^f"]);
+            CHECK(j.at(json::json_pointer("/g|h")) == j["g|h"]);
+            CHECK(j.at(json::json_pointer("/i\\j")) == j["i\\j"]);
+            CHECK(j.at(json::json_pointer("/k\"l")) == j["k\"l"]);
+
+            // escaped access
+            CHECK(j[json::json_pointer("/a~1b")] == j["a/b"]);
+            CHECK(j[json::json_pointer("/m~0n")] == j["m~n"]);
+
+            // unescaped access
+            CHECK_THROWS_AS(j.at(json::json_pointer("/a/b")), json::out_of_range&);
+            CHECK_THROWS_WITH(j.at(json::json_pointer("/a/b")),
+                              "[json.exception.out_of_range.403] key 'a' not found");
+
+            // unresolved access
+            const json j_primitive = 1;
+            CHECK_THROWS_AS(j_primitive["/foo"_json_pointer], json::out_of_range&);
+            CHECK_THROWS_WITH(j_primitive["/foo"_json_pointer],
+                              "[json.exception.out_of_range.404] unresolved reference token 'foo'");
+            CHECK_THROWS_AS(j_primitive.at("/foo"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j_primitive.at("/foo"_json_pointer),
+                              "[json.exception.out_of_range.404] unresolved reference token 'foo'");
+        }
+
+        SECTION("user-defined string literal")
+        {
+            json j = R"(
+            {
+                "foo": ["bar", "baz"],
+                "": 0,
+                "a/b": 1,
+                "c%d": 2,
+                "e^f": 3,
+                "g|h": 4,
+                "i\\j": 5,
+                "k\"l": 6,
+                " ": 7,
+                "m~n": 8
+            }
+            )"_json;
+
+            // the whole document
+            CHECK(j[""_json_pointer] == j);
+            CHECK(j.contains(""_json_pointer));
+
+            // array access
+            CHECK(j["/foo"_json_pointer] == j["foo"]);
+            CHECK(j["/foo/0"_json_pointer] == j["foo"][0]);
+            CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
+            CHECK(j.contains("/foo"_json_pointer));
+            CHECK(j.contains("/foo/0"_json_pointer));
+            CHECK(j.contains("/foo/1"_json_pointer));
+            CHECK(!j.contains("/foo/-"_json_pointer));
+        }
+    }
+
+    SECTION("array access")
+    {
+        SECTION("nonconst access")
+        {
+            json j = {1, 2, 3};
+            const json j_const = j;
+
+            // check reading access
+            CHECK(j["/0"_json_pointer] == j[0]);
+            CHECK(j["/1"_json_pointer] == j[1]);
+            CHECK(j["/2"_json_pointer] == j[2]);
+
+            // assign to existing index
+            j["/1"_json_pointer] = 13;
+            CHECK(j[1] == json(13));
+
+            // assign to nonexisting index
+            j["/3"_json_pointer] = 33;
+            CHECK(j[3] == json(33));
+
+            // assign to nonexisting index (with gap)
+            j["/5"_json_pointer] = 55;
+            CHECK(j == json({1, 13, 3, 33, nullptr, 55}));
+
+            // error with leading 0
+            CHECK_THROWS_AS(j["/01"_json_pointer], json::parse_error&);
+            CHECK_THROWS_WITH(j["/01"_json_pointer],
+                              "[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
+            CHECK_THROWS_AS(j_const["/01"_json_pointer], json::parse_error&);
+            CHECK_THROWS_WITH(j_const["/01"_json_pointer],
+                              "[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
+            CHECK_THROWS_AS(j.at("/01"_json_pointer), json::parse_error&);
+            CHECK_THROWS_WITH(j.at("/01"_json_pointer),
+                              "[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
+            CHECK_THROWS_AS(j_const.at("/01"_json_pointer), json::parse_error&);
+            CHECK_THROWS_WITH(j_const.at("/01"_json_pointer),
+                              "[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
+
+            CHECK(!j.contains("/01"_json_pointer));
+            CHECK(!j.contains("/01"_json_pointer));
+            CHECK(!j_const.contains("/01"_json_pointer));
+            CHECK(!j_const.contains("/01"_json_pointer));
+
+            // error with incorrect numbers
+            CHECK_THROWS_AS(j["/one"_json_pointer] = 1, json::parse_error&);
+            CHECK_THROWS_WITH(j["/one"_json_pointer] = 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+            CHECK_THROWS_AS(j_const["/one"_json_pointer] == 1, json::parse_error&);
+            CHECK_THROWS_WITH(j_const["/one"_json_pointer] == 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+
+            CHECK_THROWS_AS(j.at("/one"_json_pointer) = 1, json::parse_error&);
+            CHECK_THROWS_WITH(j.at("/one"_json_pointer) = 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+            CHECK_THROWS_AS(j_const.at("/one"_json_pointer) == 1, json::parse_error&);
+            CHECK_THROWS_WITH(j_const.at("/one"_json_pointer) == 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+
+            CHECK_THROWS_AS(j["/+1"_json_pointer] = 1, json::parse_error&);
+            CHECK_THROWS_WITH(j["/+1"_json_pointer] = 1,
+                              "[json.exception.parse_error.109] parse error: array index '+1' is not a number");
+            CHECK_THROWS_AS(j_const["/+1"_json_pointer] == 1, json::parse_error&);
+            CHECK_THROWS_WITH(j_const["/+1"_json_pointer] == 1,
+                              "[json.exception.parse_error.109] parse error: array index '+1' is not a number");
+
+            CHECK_THROWS_AS(j["/1+1"_json_pointer] = 1, json::out_of_range&);
+            CHECK_THROWS_WITH(j["/1+1"_json_pointer] = 1,
+                              "[json.exception.out_of_range.404] unresolved reference token '1+1'");
+            CHECK_THROWS_AS(j_const["/1+1"_json_pointer] == 1, json::out_of_range&);
+            CHECK_THROWS_WITH(j_const["/1+1"_json_pointer] == 1,
+                              "[json.exception.out_of_range.404] unresolved reference token '1+1'");
+
+            {
+                auto too_large_index = std::to_string((std::numeric_limits<unsigned long long>::max)()) + "1";
+                json::json_pointer jp(std::string("/") + too_large_index);
+                std::string throw_msg = std::string("[json.exception.out_of_range.404] unresolved reference token '") + too_large_index + "'";
+
+                CHECK_THROWS_AS(j[jp] = 1, json::out_of_range&);
+                CHECK_THROWS_WITH(j[jp] = 1, throw_msg.c_str());
+                CHECK_THROWS_AS(j_const[jp] == 1, json::out_of_range&);
+                CHECK_THROWS_WITH(j_const[jp] == 1, throw_msg.c_str());
+            }
+
+            if (sizeof(typename json::size_type) < sizeof(unsigned long long))
+            {
+                auto size_type_max_uul = static_cast<unsigned long long>((std::numeric_limits<json::size_type>::max)());
+                auto too_large_index = std::to_string(size_type_max_uul);
+                json::json_pointer jp(std::string("/") + too_large_index);
+                std::string throw_msg = std::string("[json.exception.out_of_range.410] array index ") + too_large_index + " exceeds size_type";
+
+                CHECK_THROWS_AS(j[jp] = 1, json::out_of_range&);
+                CHECK_THROWS_WITH(j[jp] = 1, throw_msg.c_str());
+                CHECK_THROWS_AS(j_const[jp] == 1, json::out_of_range&);
+                CHECK_THROWS_WITH(j_const[jp] == 1, throw_msg.c_str());
+            }
+
+            CHECK_THROWS_AS(j.at("/one"_json_pointer) = 1, json::parse_error&);
+            CHECK_THROWS_WITH(j.at("/one"_json_pointer) = 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+            CHECK_THROWS_AS(j_const.at("/one"_json_pointer) == 1, json::parse_error&);
+            CHECK_THROWS_WITH(j_const.at("/one"_json_pointer) == 1,
+                              "[json.exception.parse_error.109] parse error: array index 'one' is not a number");
+
+            CHECK(!j.contains("/one"_json_pointer));
+            CHECK(!j.contains("/one"_json_pointer));
+            CHECK(!j_const.contains("/one"_json_pointer));
+            CHECK(!j_const.contains("/one"_json_pointer));
+
+            CHECK_THROWS_AS(json({{"/list/0", 1}, {"/list/1", 2}, {"/list/three", 3}}).unflatten(), json::parse_error&);
+            CHECK_THROWS_WITH(json({{"/list/0", 1}, {"/list/1", 2}, {"/list/three", 3}}).unflatten(),
+            "[json.exception.parse_error.109] parse error: array index 'three' is not a number");
+
+            // assign to "-"
+            j["/-"_json_pointer] = 99;
+            CHECK(j == json({1, 13, 3, 33, nullptr, 55, 99}));
+
+            // error when using "-" in const object
+            CHECK_THROWS_AS(j_const["/-"_json_pointer], json::out_of_range&);
+            CHECK_THROWS_WITH(j_const["/-"_json_pointer],
+                              "[json.exception.out_of_range.402] array index '-' (3) is out of range");
+            CHECK(!j_const.contains("/-"_json_pointer));
+
+            // error when using "-" with at
+            CHECK_THROWS_AS(j.at("/-"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j.at("/-"_json_pointer),
+                              "[json.exception.out_of_range.402] array index '-' (7) is out of range");
+            CHECK_THROWS_AS(j_const.at("/-"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j_const.at("/-"_json_pointer),
+                              "[json.exception.out_of_range.402] array index '-' (3) is out of range");
+            CHECK(!j_const.contains("/-"_json_pointer));
+        }
+
+        SECTION("const access")
+        {
+            const json j = {1, 2, 3};
+
+            // check reading access
+            CHECK(j["/0"_json_pointer] == j[0]);
+            CHECK(j["/1"_json_pointer] == j[1]);
+            CHECK(j["/2"_json_pointer] == j[2]);
+
+            // assign to nonexisting index
+            CHECK_THROWS_AS(j.at("/3"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j.at("/3"_json_pointer),
+                              "[json.exception.out_of_range.401] array index 3 is out of range");
+            CHECK(!j.contains("/3"_json_pointer));
+
+            // assign to nonexisting index (with gap)
+            CHECK_THROWS_AS(j.at("/5"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j.at("/5"_json_pointer),
+                              "[json.exception.out_of_range.401] array index 5 is out of range");
+            CHECK(!j.contains("/5"_json_pointer));
+
+            // assign to "-"
+            CHECK_THROWS_AS(j["/-"_json_pointer], json::out_of_range&);
+            CHECK_THROWS_WITH(j["/-"_json_pointer],
+                              "[json.exception.out_of_range.402] array index '-' (3) is out of range");
+            CHECK_THROWS_AS(j.at("/-"_json_pointer), json::out_of_range&);
+            CHECK_THROWS_WITH(j.at("/-"_json_pointer),
+                              "[json.exception.out_of_range.402] array index '-' (3) is out of range");
+            CHECK(!j.contains("/-"_json_pointer));
+        }
+    }
+
+    SECTION("flatten")
+    {
+        json j =
+        {
+            {"pi", 3.141},
+            {"happy", true},
+            {"name", "Niels"},
+            {"nothing", nullptr},
+            {
+                "answer", {
+                    {"everything", 42}
+                }
+            },
+            {"list", {1, 0, 2}},
+            {
+                "object", {
+                    {"currency", "USD"},
+                    {"value", 42.99},
+                    {"", "empty string"},
+                    {"/", "slash"},
+                    {"~", "tilde"},
+                    {"~1", "tilde1"}
+                }
+            }
+        };
+
+        json j_flatten =
+        {
+            {"/pi", 3.141},
+            {"/happy", true},
+            {"/name", "Niels"},
+            {"/nothing", nullptr},
+            {"/answer/everything", 42},
+            {"/list/0", 1},
+            {"/list/1", 0},
+            {"/list/2", 2},
+            {"/object/currency", "USD"},
+            {"/object/value", 42.99},
+            {"/object/", "empty string"},
+            {"/object/~1", "slash"},
+            {"/object/~0", "tilde"},
+            {"/object/~01", "tilde1"}
+        };
+
+        // check if flattened result is as expected
+        CHECK(j.flatten() == j_flatten);
+
+        // check if unflattened result is as expected
+        CHECK(j_flatten.unflatten() == j);
+
+        // error for nonobjects
+        CHECK_THROWS_AS(json(1).unflatten(), json::type_error&);
+        CHECK_THROWS_WITH(json(1).unflatten(),
+                          "[json.exception.type_error.314] only objects can be unflattened");
+
+        // error for nonprimitve values
+        CHECK_THROWS_AS(json({{"/1", {1, 2, 3}}}).unflatten(), json::type_error&);
+#if JSON_DIAGNOSTICS
+        CHECK_THROWS_WITH(json({{"/1", {1, 2, 3}}}).unflatten(), "[json.exception.type_error.315] (/~11) values in object must be primitive");
+#else
+        CHECK_THROWS_WITH(json({{"/1", {1, 2, 3}}}).unflatten(), "[json.exception.type_error.315] values in object must be primitive");
+#endif
+
+        // error for conflicting values
+        json j_error = {{"", 42}, {"/foo", 17}};
+        CHECK_THROWS_AS(j_error.unflatten(), json::type_error&);
+        CHECK_THROWS_WITH(j_error.unflatten(),
+                          "[json.exception.type_error.313] invalid value to unflatten");
+
+        // explicit roundtrip check
+        CHECK(j.flatten().unflatten() == j);
+
+        // roundtrip for primitive values
+        json j_null;
+        CHECK(j_null.flatten().unflatten() == j_null);
+        json j_number = 42;
+        CHECK(j_number.flatten().unflatten() == j_number);
+        json j_boolean = false;
+        CHECK(j_boolean.flatten().unflatten() == j_boolean);
+        json j_string = "foo";
+        CHECK(j_string.flatten().unflatten() == j_string);
+
+        // roundtrip for empty structured values (will be unflattened to null)
+        json j_array(json::value_t::array);
+        CHECK(j_array.flatten().unflatten() == json());
+        json j_object(json::value_t::object);
+        CHECK(j_object.flatten().unflatten() == json());
+    }
+
+    SECTION("string representation")
+    {
+        for (auto ptr :
+                {"", "/foo", "/foo/0", "/", "/a~1b", "/c%d", "/e^f", "/g|h", "/i\\j", "/k\"l", "/ ", "/m~0n"
+                })
+        {
+            CHECK(json::json_pointer(ptr).to_string() == ptr);
+            CHECK(std::string(json::json_pointer(ptr)) == ptr);
+        }
+    }
+
+    SECTION("conversion")
+    {
+        SECTION("array")
+        {
+            json j;
+            // all numbers -> array
+            j["/12"_json_pointer] = 0;
+            CHECK(j.is_array());
+        }
+
+        SECTION("object")
+        {
+            json j;
+            // contains a number, but is not a number -> object
+            j["/a12"_json_pointer] = 0;
+            CHECK(j.is_object());
+        }
+    }
+
+    SECTION("empty, push, pop and parent")
+    {
+        const json j =
+        {
+            {"", "Hello"},
+            {"pi", 3.141},
+            {"happy", true},
+            {"name", "Niels"},
+            {"nothing", nullptr},
+            {
+                "answer", {
+                    {"everything", 42}
+                }
+            },
+            {"list", {1, 0, 2}},
+            {
+                "object", {
+                    {"currency", "USD"},
+                    {"value", 42.99},
+                    {"", "empty string"},
+                    {"/", "slash"},
+                    {"~", "tilde"},
+                    {"~1", "tilde1"}
+                }
+            }
+        };
+
+        // empty json_pointer returns the root JSON-object
+        auto ptr = ""_json_pointer;
+        CHECK(ptr.empty());
+        CHECK(j[ptr] == j);
+
+        // simple field access
+        ptr.push_back("pi");
+        CHECK(!ptr.empty());
+        CHECK(j[ptr] == j["pi"]);
+
+        ptr.pop_back();
+        CHECK(ptr.empty());
+        CHECK(j[ptr] == j);
+
+        // object and children access
+        const std::string answer("answer");
+        ptr.push_back(answer);
+        ptr.push_back("everything");
+        CHECK(!ptr.empty());
+        CHECK(j[ptr] == j["answer"]["everything"]);
+
+        // check access via const pointer
+        const auto cptr = ptr;
+        CHECK(cptr.back() == "everything");
+
+        ptr.pop_back();
+        ptr.pop_back();
+        CHECK(ptr.empty());
+        CHECK(j[ptr] == j);
+
+        // push key which has to be encoded
+        ptr.push_back("object");
+        ptr.push_back("/");
+        CHECK(j[ptr] == j["object"]["/"]);
+        CHECK(ptr.to_string() == "/object/~1");
+
+        CHECK(j[ptr.parent_pointer()] == j["object"]);
+        ptr = ptr.parent_pointer().parent_pointer();
+        CHECK(ptr.empty());
+        CHECK(j[ptr] == j);
+        // parent-pointer of the empty json_pointer is empty
+        ptr = ptr.parent_pointer();
+        CHECK(ptr.empty());
+        CHECK(j[ptr] == j);
+
+        CHECK_THROWS_WITH(ptr.pop_back(),
+                          "[json.exception.out_of_range.405] JSON pointer has no parent");
+    }
+
+    SECTION("operators")
+    {
+        const json j =
+        {
+            {"", "Hello"},
+            {"pi", 3.141},
+            {"happy", true},
+            {"name", "Niels"},
+            {"nothing", nullptr},
+            {
+                "answer", {
+                    {"everything", 42}
+                }
+            },
+            {"list", {1, 0, 2}},
+            {
+                "object", {
+                    {"currency", "USD"},
+                    {"value", 42.99},
+                    {"", "empty string"},
+                    {"/", "slash"},
+                    {"~", "tilde"},
+                    {"~1", "tilde1"}
+                }
+            }
+        };
+
+        // empty json_pointer returns the root JSON-object
+        auto ptr = ""_json_pointer;
+        CHECK(j[ptr] == j);
+
+        // simple field access
+        ptr = ptr / "pi";
+        CHECK(j[ptr] == j["pi"]);
+
+        ptr.pop_back();
+        CHECK(j[ptr] == j);
+
+        // object and children access
+        const std::string answer("answer");
+        ptr /= answer;
+        ptr = ptr / "everything";
+        CHECK(j[ptr] == j["answer"]["everything"]);
+
+        ptr.pop_back();
+        ptr.pop_back();
+        CHECK(j[ptr] == j);
+
+        CHECK(ptr / ""_json_pointer == ptr);
+        CHECK(j["/answer"_json_pointer / "/everything"_json_pointer] == j["answer"]["everything"]);
+
+        // list children access
+        CHECK(j["/list"_json_pointer / 1] == j["list"][1]);
+
+        // push key which has to be encoded
+        ptr /= "object";
+        ptr = ptr / "/";
+        CHECK(j[ptr] == j["object"]["/"]);
+        CHECK(ptr.to_string() == "/object/~1");
+    }
+}

vendor/json/test/src/unit-large_json.cpp

@@ -0,0 +1,50 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <algorithm>
+
+TEST_CASE("tests on very large JSONs")
+{
+    SECTION("issue #1419 - Segmentation fault (stack overflow) due to unbounded recursion")
+    {
+        const auto depth = 5000000;
+
+        std::string s(2 * depth, '[');
+        std::fill(s.begin() + depth, s.end(), ']');
+
+        json _;
+        CHECK_NOTHROW(_ = nlohmann::json::parse(s));
+    }
+}
+

vendor/json/test/src/unit-merge_patch.cpp

@@ -0,0 +1,262 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("JSON Merge Patch")
+{
+    SECTION("examples from RFC 7396")
+    {
+        SECTION("Section 1")
+        {
+            json document = R"({
+                "a": "b",
+                "c": {
+                    "d": "e",
+                    "f": "g"
+                }
+            })"_json;
+
+            json patch = R"({
+                "a": "z",
+                "c": {
+                    "f": null
+                }
+            })"_json;
+
+            json expected = R"({
+                "a": "z",
+                "c": {
+                    "d": "e"
+                }
+            })"_json;
+
+            document.merge_patch(patch);
+            CHECK(document == expected);
+        }
+
+        SECTION("Section 3")
+        {
+            json document = R"({
+                "title": "Goodbye!",
+                "author": {
+                    "givenName": "John",
+                    "familyName": "Doe"
+                },
+                "tags": [
+                    "example",
+                    "sample"
+                ],
+                "content": "This will be unchanged"
+            })"_json;
+
+            json patch = R"({
+                "title": "Hello!",
+                "phoneNumber": "+01-123-456-7890",
+                "author": {
+                    "familyName": null
+                },
+                "tags": [
+                    "example"
+                ]
+            })"_json;
+
+            json expected = R"({
+                "title": "Hello!",
+                "author": {
+                    "givenName": "John"
+                },
+                "tags": [
+                    "example"
+                ],
+                "content": "This will be unchanged",
+                "phoneNumber": "+01-123-456-7890"
+            })"_json;
+
+            document.merge_patch(patch);
+            CHECK(document == expected);
+        }
+
+        SECTION("Appendix A")
+        {
+            SECTION("Example 1")
+            {
+                json original = R"({"a":"b"})"_json;
+                json patch = R"({"a":"c"})"_json;
+                json result = R"({"a":"c"})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 2")
+            {
+                json original = R"({"a":"b"})"_json;
+                json patch = R"({"b":"c"})"_json;
+                json result = R"({"a":"b", "b":"c"})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 3")
+            {
+                json original = R"({"a":"b"})"_json;
+                json patch = R"({"a":null})"_json;
+                json result = R"({})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 4")
+            {
+                json original = R"({"a":"b","b":"c"})"_json;
+                json patch = R"({"a":null})"_json;
+                json result = R"({"b":"c"})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 5")
+            {
+                json original = R"({"a":["b"]})"_json;
+                json patch = R"({"a":"c"})"_json;
+                json result = R"({"a":"c"})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 6")
+            {
+                json original = R"({"a":"c"})"_json;
+                json patch = R"({"a":["b"]})"_json;
+                json result = R"({"a":["b"]})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 7")
+            {
+                json original = R"({"a":{"b": "c"}})"_json;
+                json patch = R"({"a":{"b":"d","c":null}})"_json;
+                json result = R"({"a": {"b": "d"}})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 8")
+            {
+                json original = R"({"a":[{"b":"c"}]})"_json;
+                json patch = R"({"a":[1]})"_json;
+                json result = R"({"a":[1]})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 9")
+            {
+                json original = R"(["a","b"])"_json;
+                json patch = R"(["c","d"])"_json;
+                json result = R"(["c","d"])"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 10")
+            {
+                json original = R"({"a":"b"})"_json;
+                json patch = R"(["c"])"_json;
+                json result = R"(["c"])"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 11")
+            {
+                json original = R"({"a":"foo"})"_json;
+                json patch = R"(null)"_json;
+                json result = R"(null)"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 12")
+            {
+                json original = R"({"a":"foo"})"_json;
+                json patch = R"("bar")"_json;
+                json result = R"("bar")"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 13")
+            {
+                json original = R"({"e":null})"_json;
+                json patch = R"({"a":1})"_json;
+                json result = R"({"e":null,"a":1})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 14")
+            {
+                json original = R"([1,2])"_json;
+                json patch = R"({"a":"b","c":null})"_json;
+                json result = R"({"a":"b"})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+
+            SECTION("Example 15")
+            {
+                json original = R"({})"_json;
+                json patch = R"({"a":{"bb":{"ccc":null}}})"_json;
+                json result = R"({"a":{"bb":{}}})"_json;
+
+                original.merge_patch(patch);
+                CHECK(original == result);
+            }
+        }
+    }
+}

vendor/json/test/src/unit-meta.cpp

@@ -0,0 +1,57 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("version information")
+{
+    SECTION("meta()")
+    {
+        json j = json::meta();
+
+        CHECK(j["name"] == "JSON for Modern C++");
+        CHECK(j["copyright"] == "(C) 2013-2021 Niels Lohmann");
+        CHECK(j["url"] == "https://github.com/nlohmann/json");
+        CHECK(j["version"] == json(
+        {
+            {"string", "3.9.1"},
+            {"major", 3},
+            {"minor", 9},
+            {"patch", 1}
+        }));
+
+        CHECK(j.find("platform") != j.end());
+        CHECK(j.at("compiler").find("family") != j.at("compiler").end());
+        CHECK(j.at("compiler").find("version") != j.at("compiler").end());
+        CHECK(j.at("compiler").find("c++") != j.at("compiler").end());
+    }
+}

vendor/json/test/src/unit-noexcept.cpp

@@ -0,0 +1,97 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+
+using nlohmann::json;
+
+namespace
+{
+enum test
+{
+};
+
+struct pod {};
+struct pod_bis {};
+
+void to_json(json&, pod) noexcept;
+void to_json(json&, pod_bis);
+void from_json(const json&, pod) noexcept;
+void from_json(const json&, pod_bis);
+void to_json(json&, pod) noexcept {}
+void to_json(json&, pod_bis) {}
+void from_json(const json&, pod) noexcept {}
+void from_json(const json&, pod_bis) {}
+
+static json* j = nullptr;
+
+static_assert(noexcept(json{}), "");
+static_assert(noexcept(nlohmann::to_json(*j, 2)), "");
+static_assert(noexcept(nlohmann::to_json(*j, 2.5)), "");
+static_assert(noexcept(nlohmann::to_json(*j, true)), "");
+static_assert(noexcept(nlohmann::to_json(*j, test{})), "");
+static_assert(noexcept(nlohmann::to_json(*j, pod{})), "");
+static_assert(!noexcept(nlohmann::to_json(*j, pod_bis{})), "");
+static_assert(noexcept(json(2)), "");
+static_assert(noexcept(json(test{})), "");
+static_assert(noexcept(json(pod{})), "");
+static_assert(noexcept(j->get<pod>()), "");
+static_assert(!noexcept(j->get<pod_bis>()), "");
+static_assert(noexcept(json(pod{})), "");
+}
+
+TEST_CASE("runtime checks")
+{
+    SECTION("nothrow-copy-constructible exceptions")
+    {
+        // for ERR60-CPP (https://github.com/nlohmann/json/issues/531):
+        // Exceptions should be nothrow-copy-constructible. However, compilers
+        // treat std::runtime_exception differently in this regard. Therefore,
+        // we can only demand nothrow-copy-constructibility for our exceptions
+        // if std::runtime_exception is.
+        CHECK(std::is_nothrow_copy_constructible<json::exception>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+        CHECK(std::is_nothrow_copy_constructible<json::parse_error>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+        CHECK(std::is_nothrow_copy_constructible<json::invalid_iterator>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+        CHECK(std::is_nothrow_copy_constructible<json::type_error>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+        CHECK(std::is_nothrow_copy_constructible<json::out_of_range>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+        CHECK(std::is_nothrow_copy_constructible<json::other_error>::value == std::is_nothrow_copy_constructible<std::runtime_error>::value);
+    }
+
+    SECTION("silence -Wunneeded-internal-declaration errors")
+    {
+        j = nullptr;
+        json j2;
+        to_json(j2, pod());
+        to_json(j2, pod_bis());
+        from_json(j2, pod());
+        from_json(j2, pod_bis());
+    }
+}

vendor/json/test/src/unit-ordered_json.cpp

@@ -0,0 +1,93 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+using nlohmann::ordered_json;
+
+
+TEST_CASE("ordered_json")
+{
+    json j;
+    ordered_json oj;
+
+    j["element3"] = 3;
+    j["element1"] = 1;
+    j["element2"] = 2;
+
+    oj["element3"] = 3;
+    oj["element1"] = 1;
+    oj["element2"] = 2;
+
+    CHECK(j.dump() == "{\"element1\":1,\"element2\":2,\"element3\":3}");
+    CHECK(oj.dump() == "{\"element3\":3,\"element1\":1,\"element2\":2}");
+
+    CHECK(j == json(oj));
+    CHECK(ordered_json(json(oj)) == ordered_json(j));
+
+    j.erase("element1");
+    oj.erase("element1");
+
+    CHECK(j.dump() == "{\"element2\":2,\"element3\":3}");
+    CHECK(oj.dump() == "{\"element3\":3,\"element2\":2}");
+
+    // remove again and nothing changes
+    j.erase("element1");
+    oj.erase("element1");
+
+    CHECK(j.dump() == "{\"element2\":2,\"element3\":3}");
+    CHECK(oj.dump() == "{\"element3\":3,\"element2\":2}");
+
+    // There are no dup keys cause constructor calls emplace...
+    json multi {{"z", 1}, {"m", 2}, {"m", 3}, {"y", 4}, {"m", 5}};
+    CHECK(multi.size() == 3);
+    CHECK(multi.dump() == "{\"m\":2,\"y\":4,\"z\":1}");
+
+    ordered_json multi_ordered {{"z", 1}, {"m", 2}, {"m", 3}, {"y", 4}, {"m", 5}};
+    CHECK(multi_ordered.size() == 3);
+    CHECK(multi_ordered.dump() == "{\"z\":1,\"m\":2,\"y\":4}");
+    CHECK(multi_ordered.erase("m") == 1);
+    CHECK(multi_ordered.dump() == "{\"z\":1,\"y\":4}");
+
+    // Ranged insert test.
+    // It seems that values shouldn't be overwritten. Only new values are added
+    json j1 {{"c", 1}, {"b", 2}, {"a", 3}};
+    const json j2 {{"c", 77}, {"d", 42}, {"a", 4}};
+    j1.insert( j2.cbegin(), j2.cend() );
+    CHECK(j1.size() == 4);
+    CHECK(j1.dump() == "{\"a\":3,\"b\":2,\"c\":1,\"d\":42}");
+
+    ordered_json oj1 {{"c", 1}, {"b", 2}, {"a", 3}};
+    const ordered_json oj2 {{"c", 77}, {"d", 42}, {"a", 4}};
+    oj1.insert( oj2.cbegin(), oj2.cend() );
+    CHECK(oj1.size() == 4);
+    CHECK(oj1.dump() == "{\"c\":1,\"b\":2,\"a\":3,\"d\":42}");
+}

vendor/json/test/src/unit-ordered_map.cpp

@@ -0,0 +1,292 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::ordered_map;
+
+
+TEST_CASE("ordered_map")
+{
+    SECTION("constructor")
+    {
+        SECTION("constructor from iterator range")
+        {
+            std::map<std::string, std::string> m {{"eins", "one"}, {"zwei", "two"}, {"drei", "three"}};
+            ordered_map<std::string, std::string> om(m.begin(), m.end());
+            CHECK(om.size() == 3);
+        }
+
+        SECTION("copy assignment")
+        {
+            std::map<std::string, std::string> m {{"eins", "one"}, {"zwei", "two"}, {"drei", "three"}};
+            ordered_map<std::string, std::string> om(m.begin(), m.end());
+            const auto com = om;
+            CHECK(com.size() == 3);
+        }
+    }
+
+    SECTION("at")
+    {
+        std::map<std::string, std::string> m {{"eins", "one"}, {"zwei", "two"}, {"drei", "three"}};
+        ordered_map<std::string, std::string> om(m.begin(), m.end());
+        const auto com = om;
+
+        SECTION("with Key&&")
+        {
+            CHECK(om.at(std::string("eins")) == std::string("one"));
+            CHECK(com.at(std::string("eins")) == std::string("one"));
+            CHECK_THROWS_AS(om.at(std::string("vier")), std::out_of_range);
+            CHECK_THROWS_AS(com.at(std::string("vier")), std::out_of_range);
+        }
+
+        SECTION("with const Key&&")
+        {
+            const std::string eins = "eins";
+            const std::string vier = "vier";
+            CHECK(om.at(eins) == std::string("one"));
+            CHECK(com.at(eins) == std::string("one"));
+            CHECK_THROWS_AS(om.at(vier), std::out_of_range);
+            CHECK_THROWS_AS(com.at(vier), std::out_of_range);
+        }
+
+        SECTION("with string literal")
+        {
+            CHECK(om.at("eins") == std::string("one"));
+            CHECK(com.at("eins") == std::string("one"));
+            CHECK_THROWS_AS(om.at("vier"), std::out_of_range);
+            CHECK_THROWS_AS(com.at("vier"), std::out_of_range);
+        }
+    }
+
+    SECTION("operator[]")
+    {
+        std::map<std::string, std::string> m {{"eins", "one"}, {"zwei", "two"}, {"drei", "three"}};
+        ordered_map<std::string, std::string> om(m.begin(), m.end());
+        const auto com = om;
+
+        SECTION("with Key&&")
+        {
+            CHECK(om[std::string("eins")] == std::string("one"));
+            CHECK(com[std::string("eins")] == std::string("one"));
+
+            CHECK(om[std::string("vier")] == std::string(""));
+            CHECK(om.size() == 4);
+        }
+
+        SECTION("with const Key&&")
+        {
+            const std::string eins = "eins";
+            const std::string vier = "vier";
+
+            CHECK(om[eins] == std::string("one"));
+            CHECK(com[eins] == std::string("one"));
+
+            CHECK(om[vier] == std::string(""));
+            CHECK(om.size() == 4);
+        }
+
+        SECTION("with string literal")
+        {
+            CHECK(om["eins"] == std::string("one"));
+            CHECK(com["eins"] == std::string("one"));
+
+            CHECK(om["vier"] == std::string(""));
+            CHECK(om.size() == 4);
+        }
+    }
+
+    SECTION("erase")
+    {
+        ordered_map<std::string, std::string> om;
+        om["eins"] = "one";
+        om["zwei"] = "two";
+        om["drei"] = "three";
+
+        {
+            auto it = om.begin();
+            CHECK(it->first == "eins");
+            ++it;
+            CHECK(it->first == "zwei");
+            ++it;
+            CHECK(it->first == "drei");
+            ++it;
+            CHECK(it == om.end());
+        }
+
+        SECTION("with Key&&")
+        {
+            CHECK(om.size() == 3);
+            CHECK(om.erase(std::string("eins")) == 1);
+            CHECK(om.size() == 2);
+            CHECK(om.erase(std::string("vier")) == 0);
+            CHECK(om.size() == 2);
+
+            auto it = om.begin();
+            CHECK(it->first == "zwei");
+            ++it;
+            CHECK(it->first == "drei");
+            ++it;
+            CHECK(it == om.end());
+        }
+
+        SECTION("with const Key&&")
+        {
+            const std::string eins = "eins";
+            const std::string vier = "vier";
+            CHECK(om.size() == 3);
+            CHECK(om.erase(eins) == 1);
+            CHECK(om.size() == 2);
+            CHECK(om.erase(vier) == 0);
+            CHECK(om.size() == 2);
+
+            auto it = om.begin();
+            CHECK(it->first == "zwei");
+            ++it;
+            CHECK(it->first == "drei");
+            ++it;
+            CHECK(it == om.end());
+        }
+
+        SECTION("with string literal")
+        {
+            CHECK(om.size() == 3);
+            CHECK(om.erase("eins") == 1);
+            CHECK(om.size() == 2);
+            CHECK(om.erase("vier") == 0);
+            CHECK(om.size() == 2);
+
+            auto it = om.begin();
+            CHECK(it->first == "zwei");
+            ++it;
+            CHECK(it->first == "drei");
+            ++it;
+            CHECK(it == om.end());
+        }
+
+        SECTION("with iterator")
+        {
+            CHECK(om.size() == 3);
+            CHECK(om.begin()->first == "eins");
+            CHECK(std::next(om.begin(), 1)->first == "zwei");
+            CHECK(std::next(om.begin(), 2)->first == "drei");
+
+            auto it = om.erase(om.begin());
+            CHECK(it->first == "zwei");
+            CHECK(om.size() == 2);
+
+            auto it2 = om.begin();
+            CHECK(it2->first == "zwei");
+            ++it2;
+            CHECK(it2->first == "drei");
+            ++it2;
+            CHECK(it2 == om.end());
+        }
+    }
+
+    SECTION("count")
+    {
+        ordered_map<std::string, std::string> om;
+        om["eins"] = "one";
+        om["zwei"] = "two";
+        om["drei"] = "three";
+
+        const std::string eins("eins");
+        const std::string vier("vier");
+        CHECK(om.count("eins") == 1);
+        CHECK(om.count(std::string("eins")) == 1);
+        CHECK(om.count(eins) == 1);
+        CHECK(om.count("vier") == 0);
+        CHECK(om.count(std::string("vier")) == 0);
+        CHECK(om.count(vier) == 0);
+    }
+
+    SECTION("find")
+    {
+        ordered_map<std::string, std::string> om;
+        om["eins"] = "one";
+        om["zwei"] = "two";
+        om["drei"] = "three";
+        const auto com = om;
+
+        const std::string eins("eins");
+        const std::string vier("vier");
+        CHECK(om.find("eins") == om.begin());
+        CHECK(om.find(std::string("eins")) == om.begin());
+        CHECK(om.find(eins) == om.begin());
+        CHECK(om.find("vier") == om.end());
+        CHECK(om.find(std::string("vier")) == om.end());
+        CHECK(om.find(vier) == om.end());
+
+        CHECK(com.find("eins") == com.begin());
+        CHECK(com.find(std::string("eins")) == com.begin());
+        CHECK(com.find(eins) == com.begin());
+        CHECK(com.find("vier") == com.end());
+        CHECK(com.find(std::string("vier")) == com.end());
+        CHECK(com.find(vier) == com.end());
+    }
+
+    SECTION("insert")
+    {
+        ordered_map<std::string, std::string> om;
+        om["eins"] = "one";
+        om["zwei"] = "two";
+        om["drei"] = "three";
+
+        SECTION("const value_type&")
+        {
+            ordered_map<std::string, std::string>::value_type vt1 {"eins", "1"};
+            ordered_map<std::string, std::string>::value_type vt4 {"vier", "four"};
+
+            auto res1 = om.insert(vt1);
+            CHECK(res1.first == om.begin());
+            CHECK(res1.second == false);
+            CHECK(om.size() == 3);
+
+            auto res4 = om.insert(vt4);
+            CHECK(res4.first == om.begin() + 3);
+            CHECK(res4.second == true);
+            CHECK(om.size() == 4);
+        }
+
+        SECTION("value_type&&")
+        {
+            auto res1 = om.insert({"eins", "1"});
+            CHECK(res1.first == om.begin());
+            CHECK(res1.second == false);
+            CHECK(om.size() == 3);
+
+            auto res4 = om.insert({"vier", "four"});
+            CHECK(res4.first == om.begin() + 3);
+            CHECK(res4.second == true);
+            CHECK(om.size() == 4);
+        }
+    }
+}

vendor/json/test/src/unit-pointer_access.cpp

@@ -0,0 +1,500 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("pointer access")
+{
+    SECTION("pointer access to object_t")
+    {
+        using test_type = json::object_t;
+        json value = {{"one", 1}, {"two", 2}};
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() != nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const object_t")
+    {
+        using test_type = const json::object_t;
+        const json value = {{"one", 1}, {"two", 2}};
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to array_t")
+    {
+        using test_type = json::array_t;
+        json value = {1, 2, 3, 4};
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() != nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const array_t")
+    {
+        using test_type = const json::array_t;
+        const json value = {1, 2, 3, 4};
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to string_t")
+    {
+        using test_type = json::string_t;
+        json value = "hello";
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() != nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const string_t")
+    {
+        using test_type = const json::string_t;
+        const json value = "hello";
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to boolean_t")
+    {
+        using test_type = json::boolean_t;
+        json value = false;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() != nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const boolean_t")
+    {
+        using test_type = const json::boolean_t;
+        const json value = false;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        //CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to number_integer_t")
+    {
+        using test_type = json::number_integer_t;
+        json value = 23;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() != nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const number_integer_t")
+    {
+        using test_type = const json::number_integer_t;
+        const json value = 23;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to number_unsigned_t")
+    {
+        using test_type = json::number_unsigned_t;
+        json value = 23u;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() != nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() != nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const number_unsigned_t")
+    {
+        using test_type = const json::number_unsigned_t;
+        const json value = 23u;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to number_float_t")
+    {
+        using test_type = json::number_float_t;
+        json value = 42.23;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == Approx(value.get<test_type>()));
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == Approx(value.get<test_type>()));
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == Approx(value.get<test_type>()));
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<json::number_float_t*>() != nullptr);
+        CHECK(value.get_ptr<json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const number_float_t")
+    {
+        using test_type = const json::number_float_t;
+        const json value = 42.23;
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == Approx(value.get<test_type>()));
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == Approx(value.get<test_type>()));
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == Approx(value.get<test_type>()));
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() != nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() == nullptr);
+    }
+
+    SECTION("pointer access to const binary_t")
+    {
+        using test_type = const json::binary_t;
+        const json value = json::binary({1, 2, 3});
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() != nullptr);
+    }
+
+    SECTION("pointer access to const binary_t")
+    {
+        using test_type = const json::binary_t;
+        const json value = json::binary({});
+
+        // check if pointers are returned correctly
+        test_type* p1 = value.get_ptr<test_type*>();
+        CHECK(p1 == value.get_ptr<test_type*>());
+        CHECK(*p1 == value.get<test_type>());
+
+        const test_type* p2 = value.get_ptr<const test_type*>();
+        CHECK(p2 == value.get_ptr<const test_type*>());
+        CHECK(*p2 == value.get<test_type>());
+
+        const test_type* const p3 = value.get_ptr<const test_type* const>();
+        CHECK(p3 == value.get_ptr<const test_type* const>());
+        CHECK(*p3 == value.get<test_type>());
+
+        // check if null pointers are returned correctly
+        CHECK(value.get_ptr<const json::object_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::array_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::string_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::boolean_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_integer_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_unsigned_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::number_float_t*>() == nullptr);
+        CHECK(value.get_ptr<const json::binary_t*>() != nullptr);
+    }
+}

vendor/json/test/src/unit-readme.cpp

@@ -0,0 +1,327 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <deque>
+#include <forward_list>
+#include <list>
+#include <set>
+#include <unordered_map>
+#include <unordered_set>
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+
+#if defined(_MSC_VER)
+    #pragma warning (push)
+    #pragma warning (disable : 4189) // local variable is initialized but not referenced
+#endif
+
+TEST_CASE("README" * doctest::skip())
+{
+    {
+        // redirect std::cout for the README file
+        auto old_cout_buffer = std::cout.rdbuf();
+        std::ostringstream new_stream;
+        std::cout.rdbuf(new_stream.rdbuf());
+        {
+            // create an empty structure (null)
+            json j;
+
+            // add a number that is stored as double (note the implicit conversion of j to an object)
+            j["pi"] = 3.141;
+
+            // add a Boolean that is stored as bool
+            j["happy"] = true;
+
+            // add a string that is stored as std::string
+            j["name"] = "Niels";
+
+            // add another null object by passing nullptr
+            j["nothing"] = nullptr;
+
+            // add an object inside the object
+            j["answer"]["everything"] = 42;
+
+            // add an array that is stored as std::vector (using an initializer list)
+            j["list"] = { 1, 0, 2 };
+
+            // add another object (using an initializer list of pairs)
+            j["object"] = { {"currency", "USD"}, {"value", 42.99} };
+
+            // instead, you could also write (which looks very similar to the JSON above)
+            json j2 =
+            {
+                {"pi", 3.141},
+                {"happy", true},
+                {"name", "Niels"},
+                {"nothing", nullptr},
+                {
+                    "answer", {
+                        {"everything", 42}
+                    }
+                },
+                {"list", {1, 0, 2}},
+                {
+                    "object", {
+                        {"currency", "USD"},
+                        {"value", 42.99}
+                    }
+                }
+            };
+        }
+
+        {
+            // ways to express the empty array []
+            json empty_array_implicit = {{}};
+            CHECK(empty_array_implicit.is_array());
+            json empty_array_explicit = json::array();
+            CHECK(empty_array_explicit.is_array());
+
+            // a way to express the empty object {}
+            json empty_object_explicit = json::object();
+            CHECK(empty_object_explicit.is_object());
+
+            // a way to express an _array_ of key/value pairs [["currency", "USD"], ["value", 42.99]]
+            json array_not_object = json::array({ {"currency", "USD"}, {"value", 42.99} });
+            CHECK(array_not_object.is_array());
+            CHECK(array_not_object.size() == 2);
+            CHECK(array_not_object[0].is_array());
+            CHECK(array_not_object[1].is_array());
+        }
+
+        {
+            // create object from string literal
+            json j = "{ \"happy\": true, \"pi\": 3.141 }"_json;
+
+            // or even nicer with a raw string literal
+            auto j2 = R"(
+          {
+            "happy": true,
+            "pi": 3.141
+          }
+        )"_json;
+
+            // or explicitly
+            auto j3 = json::parse("{ \"happy\": true, \"pi\": 3.141 }");
+
+            // explicit conversion to string
+            std::string s = j.dump();    // {\"happy\":true,\"pi\":3.141}
+
+            // serialization with pretty printing
+            // pass in the amount of spaces to indent
+            std::cout << j.dump(4) << std::endl;
+            // {
+            //     "happy": true,
+            //     "pi": 3.141
+            // }
+
+            std::cout << std::setw(2) << j << std::endl;
+        }
+
+        {
+            // create an array using push_back
+            json j;
+            j.push_back("foo");
+            j.push_back(1);
+            j.push_back(true);
+
+            // comparison
+            bool x = (j == "[\"foo\", 1, true]"_json);  // true
+            CHECK(x == true);
+
+            // iterate the array
+            for (json::iterator it = j.begin(); it != j.end(); ++it)
+            {
+                std::cout << *it << '\n';
+            }
+
+            // range-based for
+            for (auto element : j)
+            {
+                std::cout << element << '\n';
+            }
+
+            // getter/setter
+            const auto tmp = j[0].get<std::string>();
+            j[1] = 42;
+            bool foo{j.at(2)};
+            CHECK(foo == true);
+
+            // other stuff
+            j.size();     // 3 entries
+            j.empty();    // false
+            j.type();     // json::value_t::array
+            j.clear();    // the array is empty again
+
+            // create an object
+            json o;
+            o["foo"] = 23;
+            o["bar"] = false;
+            o["baz"] = 3.141;
+
+            // find an entry
+            if (o.find("foo") != o.end())
+            {
+                // there is an entry with key "foo"
+            }
+        }
+
+        {
+            std::vector<int> c_vector {1, 2, 3, 4};
+            json j_vec(c_vector);
+            // [1, 2, 3, 4]
+
+            std::deque<float> c_deque {1.2f, 2.3f, 3.4f, 5.6f};
+            json j_deque(c_deque);
+            // [1.2, 2.3, 3.4, 5.6]
+
+            std::list<bool> c_list {true, true, false, true};
+            json j_list(c_list);
+            // [true, true, false, true]
+
+            std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
+            json j_flist(c_flist);
+            // [12345678909876, 23456789098765, 34567890987654, 45678909876543]
+
+            std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
+            json j_array(c_array);
+            // [1, 2, 3, 4]
+
+            std::set<std::string> c_set {"one", "two", "three", "four", "one"};
+            json j_set(c_set); // only one entry for "one" is used
+            // ["four", "one", "three", "two"]
+
+            std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
+            json j_uset(c_uset); // only one entry for "one" is used
+            // maybe ["two", "three", "four", "one"]
+
+            std::multiset<std::string> c_mset {"one", "two", "one", "four"};
+            json j_mset(c_mset); // both entries for "one" are used
+            // maybe ["one", "two", "one", "four"]
+
+            std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
+            json j_umset(c_umset); // both entries for "one" are used
+            // maybe ["one", "two", "one", "four"]
+        }
+
+        {
+            std::map<std::string, int> c_map { {"one", 1}, {"two", 2}, {"three", 3} };
+            json j_map(c_map);
+            // {"one": 1, "two": 2, "three": 3}
+
+            std::unordered_map<const char*, float> c_umap { {"one", 1.2f}, {"two", 2.3f}, {"three", 3.4f} };
+            json j_umap(c_umap);
+            // {"one": 1.2, "two": 2.3, "three": 3.4}
+
+            std::multimap<std::string, bool> c_mmap { {"one", true}, {"two", true}, {"three", false}, {"three", true} };
+            json j_mmap(c_mmap); // only one entry for key "three" is used
+            // maybe {"one": true, "two": true, "three": true}
+
+            std::unordered_multimap<std::string, bool> c_ummap { {"one", true}, {"two", true}, {"three", false}, {"three", true} };
+            json j_ummap(c_ummap); // only one entry for key "three" is used
+            // maybe {"one": true, "two": true, "three": true}
+        }
+
+        {
+            // strings
+            std::string s1 = "Hello, world!";
+            json js = s1;
+            auto s2 = js.get<std::string>();
+
+            // Booleans
+            bool b1 = true;
+            json jb = b1;
+            bool b2{jb};
+            CHECK(b2 == true);
+
+            // numbers
+            int i = 42;
+            json jn = i;
+            double f{jn};
+            CHECK(f == 42);
+
+            // etc.
+
+            std::string vs = js.get<std::string>();
+            bool vb = jb.get<bool>();
+            CHECK(vb == true);
+            int vi = jn.get<int>();
+            CHECK(vi == 42);
+
+            // etc.
+        }
+
+        {
+            // a JSON value
+            json j_original = R"({
+          "baz": ["one", "two", "three"],
+          "foo": "bar"
+        })"_json;
+
+            // access members with a JSON pointer (RFC 6901)
+            j_original["/baz/1"_json_pointer];
+            // "two"
+
+            // a JSON patch (RFC 6902)
+            json j_patch = R"([
+          { "op": "replace", "path": "/baz", "value": "boo" },
+          { "op": "add", "path": "/hello", "value": ["world"] },
+          { "op": "remove", "path": "/foo"}
+        ])"_json;
+
+            // apply the patch
+            json j_result = j_original.patch(j_patch);
+            // {
+            //    "baz": "boo",
+            //    "hello": ["world"]
+            // }
+
+            // calculate a JSON patch from two JSON values
+            auto res = json::diff(j_result, j_original);
+            // [
+            //   { "op":" replace", "path": "/baz", "value": ["one", "two", "three"] },
+            //   { "op":"remove","path":"/hello" },
+            //   { "op":"add","path":"/foo","value":"bar" }
+            // ]
+        }
+
+        // restore old std::cout
+        std::cout.rdbuf(old_cout_buffer);
+    }
+}
+
+#if defined(_MSC_VER)
+    #pragma warning (pop)
+#endif

vendor/json/test/src/unit-reference_access.cpp

@@ -0,0 +1,318 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("reference access")
+{
+    // create a JSON value with different types
+    json json_types =
+    {
+        {"boolean", true},
+        {
+            "number", {
+                {"integer", 42},
+                {"floating-point", 17.23}
+            }
+        },
+        {"string", "Hello, world!"},
+        {"array", {1, 2, 3, 4, 5}},
+        {"null", nullptr}
+    };
+
+    SECTION("reference access to object_t")
+    {
+        using test_type = json::object_t;
+        json value = {{"one", 1}, {"two", 2}};
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_NOTHROW(value.get_ref<json::object_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+        CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object");
+    }
+
+    SECTION("const reference access to const object_t")
+    {
+        using test_type = json::object_t;
+        const json value = {{"one", 1}, {"two", 2}};
+
+        // this should not compile
+        // test_type& p1 = value.get_ref<test_type&>();
+
+        // check if references are returned correctly
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+    }
+
+    SECTION("reference access to array_t")
+    {
+        using test_type = json::array_t;
+        json value = {1, 2, 3, 4};
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+        CHECK_NOTHROW(value.get_ref<json::array_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+        CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is array");
+    }
+
+    SECTION("reference access to string_t")
+    {
+        using test_type = json::string_t;
+        json value = "hello";
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+        CHECK_NOTHROW(value.get_ref<json::string_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+        CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is string");
+    }
+
+    SECTION("reference access to boolean_t")
+    {
+        using test_type = json::boolean_t;
+        json value = false;
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+        CHECK_NOTHROW(value.get_ref<json::boolean_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is boolean");
+    }
+
+    SECTION("reference access to number_integer_t")
+    {
+        using test_type = json::number_integer_t;
+        json value = -23;
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_NOTHROW(value.get_ref<json::number_integer_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+    }
+
+    SECTION("reference access to number_unsigned_t")
+    {
+        using test_type = json::number_unsigned_t;
+        json value = 23u;
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        //CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        //CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+        //    "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_NOTHROW(value.get_ref<json::number_unsigned_t&>());
+        CHECK_THROWS_AS(value.get_ref<json::number_float_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_float_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+    }
+
+    SECTION("reference access to number_float_t")
+    {
+        using test_type = json::number_float_t;
+        json value = 42.23;
+
+        // check if references are returned correctly
+        test_type& p1 = value.get_ref<test_type&>();
+        CHECK(&p1 == value.get_ptr<test_type*>());
+        CHECK(p1 == value.get<test_type>());
+
+        const test_type& p2 = value.get_ref<const test_type&>();
+        CHECK(&p2 == value.get_ptr<const test_type*>());
+        CHECK(p2 == value.get<test_type>());
+
+        // check if mismatching references throw correctly
+        CHECK_THROWS_AS(value.get_ref<json::object_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::object_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::array_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::array_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::string_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::string_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::boolean_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::boolean_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::number_integer_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_integer_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_THROWS_AS(value.get_ref<json::number_unsigned_t&>(), json::type_error&);
+        CHECK_THROWS_WITH(value.get_ref<json::number_unsigned_t&>(),
+                          "[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number");
+        CHECK_NOTHROW(value.get_ref<json::number_float_t&>());
+    }
+}

vendor/json/test/src/unit-regression2.cpp

@@ -0,0 +1,501 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
+
+// for some reason including this after the json header leads to linker errors with VS 2017...
+#include <locale>
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <fstream>
+#include <sstream>
+#include <list>
+#include <cstdio>
+#include <test_data.hpp>
+
+#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
+    #define JSON_HAS_CPP_17
+#endif
+
+#ifdef JSON_HAS_CPP_17
+    #include <variant>
+#endif
+
+#ifdef JSON_HAS_CPP_20
+    #include <span>
+#endif
+
+/////////////////////////////////////////////////////////////////////
+// for #1021
+/////////////////////////////////////////////////////////////////////
+
+using float_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, float>;
+
+/////////////////////////////////////////////////////////////////////
+// for #1647
+/////////////////////////////////////////////////////////////////////
+namespace
+{
+struct NonDefaultFromJsonStruct { };
+
+inline bool operator== (NonDefaultFromJsonStruct const&, NonDefaultFromJsonStruct const&)
+{
+    return true;
+}
+
+enum class for_1647 { one, two };
+
+NLOHMANN_JSON_SERIALIZE_ENUM(for_1647,
+{
+    {for_1647::one, "one"},
+    {for_1647::two, "two"},
+})
+}
+
+/////////////////////////////////////////////////////////////////////
+// for #1299
+/////////////////////////////////////////////////////////////////////
+
+struct Data
+{
+    Data() = default;
+    Data(const std::string& a_, const std::string b_) : a(a_), b(b_) {}
+    std::string a {};
+    std::string b {};
+};
+
+void from_json(const json& j, Data& data)
+{
+    j["a"].get_to(data.a);
+    j["b"].get_to(data.b);
+}
+
+bool operator==(Data const& lhs, Data const& rhs)
+{
+    return lhs.a == rhs.a && lhs.b == rhs.b;
+}
+
+//bool operator!=(Data const& lhs, Data const& rhs)
+//{
+//    return !(lhs == rhs);
+//}
+
+namespace nlohmann
+{
+template <>
+struct adl_serializer<NonDefaultFromJsonStruct>
+{
+    static NonDefaultFromJsonStruct from_json (json const&) noexcept
+    {
+        return {};
+    }
+};
+}
+
+/////////////////////////////////////////////////////////////////////
+// for #1805
+/////////////////////////////////////////////////////////////////////
+
+struct NotSerializableData
+{
+    int mydata;
+    float myfloat;
+};
+
+
+TEST_CASE("regression tests 2")
+{
+    SECTION("issue #1001 - Fix memory leak during parser callback")
+    {
+        auto geojsonExample = R"(
+          { "type": "FeatureCollection",
+            "features": [
+              { "type": "Feature",
+                "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
+                "properties": {"prop0": "value0"}
+                },
+              { "type": "Feature",
+                "geometry": {
+                  "type": "LineString",
+                  "coordinates": [
+                    [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
+                    ]
+                  },
+                "properties": {
+                  "prop0": "value0",
+                  "prop1": 0.0
+                  }
+                },
+              { "type": "Feature",
+                 "geometry": {
+                   "type": "Polygon",
+                   "coordinates": [
+                     [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
+                       [100.0, 1.0], [100.0, 0.0] ]
+                     ]
+                 },
+                 "properties": {
+                   "prop0": "value0",
+                   "prop1": {"this": "that"}
+                   }
+                 }
+               ]
+             })";
+
+        json::parser_callback_t cb = [&](int, json::parse_event_t event, json & parsed)
+        {
+            // skip uninteresting events
+            if (event == json::parse_event_t::value && !parsed.is_primitive())
+            {
+                return false;
+            }
+
+            switch (event)
+            {
+                case json::parse_event_t::key:
+                {
+                    return true;
+                }
+                case json::parse_event_t::value:
+                {
+                    return false;
+                }
+                case json::parse_event_t::object_start:
+                {
+                    return true;
+                }
+                case json::parse_event_t::object_end:
+                {
+                    return false;
+                }
+                case json::parse_event_t::array_start:
+                {
+                    return true;
+                }
+                case json::parse_event_t::array_end:
+                {
+                    return false;
+                }
+
+                default:
+                {
+                    return true;
+                }
+            }
+        };
+
+        auto j = json::parse(geojsonExample, cb, true);
+        CHECK(j == json());
+    }
+
+    SECTION("issue #1021 - to/from_msgpack only works with standard typization")
+    {
+        float_json j = 1000.0;
+        CHECK(float_json::from_cbor(float_json::to_cbor(j)) == j);
+        CHECK(float_json::from_msgpack(float_json::to_msgpack(j)) == j);
+        CHECK(float_json::from_ubjson(float_json::to_ubjson(j)) == j);
+
+        float_json j2 = {1000.0, 2000.0, 3000.0};
+        CHECK(float_json::from_ubjson(float_json::to_ubjson(j2, true, true)) == j2);
+    }
+
+    SECTION("issue #1045 - Using STL algorithms with JSON containers with expected results?")
+    {
+        json diffs = nlohmann::json::array();
+        json m1{{"key1", 42}};
+        json m2{{"key2", 42}};
+        auto p1 = m1.items();
+        auto p2 = m2.items();
+
+        using it_type = decltype(p1.begin());
+
+        std::set_difference(
+            p1.begin(), p1.end(),
+            p2.begin(), p2.end(),
+            std::inserter(diffs, diffs.end()), [&](const it_type & e1, const it_type & e2) -> bool
+        {
+            using comper_pair = std::pair<std::string, decltype(e1.value())>; // Trying to avoid unneeded copy
+            return comper_pair(e1.key(), e1.value()) < comper_pair(e2.key(), e2.value()); // Using pair comper
+        });
+
+        CHECK(diffs.size() == 1); // Note the change here, was 2
+    }
+
+#ifdef JSON_HAS_CPP_17
+    SECTION("issue #1292 - Serializing std::variant causes stack overflow")
+    {
+        static_assert(
+            !std::is_constructible<json, std::variant<int, float>>::value, "");
+    }
+#endif
+
+    SECTION("issue #1299 - compile error in from_json converting to container "
+            "with std::pair")
+    {
+        json j =
+        {
+            {"1", {{"a", "testa_1"}, {"b", "testb_1"}}},
+            {"2", {{"a", "testa_2"}, {"b", "testb_2"}}},
+            {"3", {{"a", "testa_3"}, {"b", "testb_3"}}},
+        };
+
+        std::map<std::string, Data> expected
+        {
+            {"1", {"testa_1", "testb_1"}},
+            {"2", {"testa_2", "testb_2"}},
+            {"3", {"testa_3", "testb_3"}},
+        };
+        const auto data = j.get<decltype(expected)>();
+        CHECK(expected == data);
+    }
+
+    SECTION("issue #1445 - buffer overflow in dumping invalid utf-8 strings")
+    {
+        SECTION("a bunch of -1, ensure_ascii=true")
+        {
+            const auto length = 300;
+
+            json dump_test;
+            dump_test["1"] = std::string(length, -1);
+
+            std::string expected = "{\"1\":\"";
+            for (int i = 0; i < length; ++i)
+            {
+                expected += "\\ufffd";
+            }
+            expected += "\"}";
+
+            auto s = dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
+            CHECK(s == expected);
+        }
+        SECTION("a bunch of -2, ensure_ascii=false")
+        {
+            const auto length = 500;
+
+            json dump_test;
+            dump_test["1"] = std::string(length, -2);
+
+            std::string expected = "{\"1\":\"";
+            for (int i = 0; i < length; ++i)
+            {
+                expected += "\xEF\xBF\xBD";
+            }
+            expected += "\"}";
+
+            auto s = dump_test.dump(-1, ' ', false, nlohmann::json::error_handler_t::replace);
+            CHECK(s == expected);
+        }
+        SECTION("test case in issue #1445")
+        {
+            nlohmann::json dump_test;
+            const int data[] =
+            {
+                109,  108,  103,  125,  -122, -53,  115,
+                18,   3,    0,    102,  19,   1,    15,
+                -110, 13,   -3,   -1,   -81,  32,   2,
+                0,    0,    0,    0,    0,    0,    0,
+                8,    0,    0,    0,    0,    0,    0,
+                0,    0,    0,    0,    0,    -80,  2,
+                0,    0,    96,   -118, 46,   -116, 46,
+                109,  -84,  -87,  108,  14,   109,  -24,
+                -83,  13,   -18,  -51,  -83,  -52,  -115,
+                14,   6,    32,   0,    0,    0,    0,
+                0,    0,    0,    0,    0,    0,    0,
+                64,   3,    0,    0,    0,    35,   -74,
+                -73,  55,   57,   -128, 0,    0,    0,
+                0,    0,    0,    0,    0,    0,    0,
+                0,    0,    33,   0,    0,    0,    -96,
+                -54,  -28,  -26
+            };
+            std::string s;
+            for (unsigned i = 0; i < sizeof(data) / sizeof(int); i++)
+            {
+                s += static_cast<char>(data[i]);
+            }
+            dump_test["1"] = s;
+            dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
+        }
+    }
+
+    SECTION("issue #1447 - Integer Overflow (OSS-Fuzz 12506)")
+    {
+        json j = json::parse("[-9223372036854775808]");
+        CHECK(j.dump() == "[-9223372036854775808]");
+    }
+
+    SECTION("issue #1708 - minimum value of int64_t can be outputted")
+    {
+        constexpr auto smallest = (std::numeric_limits<int64_t>::min)();
+        json j = smallest;
+        CHECK(j.dump() == std::to_string(smallest));
+    }
+
+    SECTION("issue #1727 - Contains with non-const lvalue json_pointer picks the wrong overload")
+    {
+        json j = {{"root", {{"settings", {{"logging", true}}}}}};
+
+        auto jptr1 = "/root/settings/logging"_json_pointer;
+        auto jptr2 = json::json_pointer{"/root/settings/logging"};
+
+        CHECK(j.contains(jptr1));
+        CHECK(j.contains(jptr2));
+    }
+
+    SECTION("issue #1647 - compile error when deserializing enum if both non-default from_json and non-member operator== exists for other type")
+    {
+        {
+            json j;
+            NonDefaultFromJsonStruct x(j);
+            NonDefaultFromJsonStruct y;
+            CHECK(x == y);
+        }
+
+        auto val = nlohmann::json("one").get<for_1647>();
+        CHECK(val == for_1647::one);
+        json j = val;
+    }
+
+    SECTION("issue #1715 - json::from_cbor does not respect allow_exceptions = false when input is string literal")
+    {
+        SECTION("string literal")
+        {
+            json cbor = json::from_cbor("B", true, false);
+            CHECK(cbor.is_discarded());
+        }
+
+        SECTION("string array")
+        {
+            const char input[] = { 'B', 0x00 };
+            json cbor = json::from_cbor(input, true, false);
+            CHECK(cbor.is_discarded());
+        }
+
+        SECTION("std::string")
+        {
+            json cbor = json::from_cbor(std::string("B"), true, false);
+            CHECK(cbor.is_discarded());
+        }
+    }
+
+    SECTION("issue #1805 - A pair<T1, T2> is json constructible only if T1 and T2 are json constructible")
+    {
+        static_assert(!std::is_constructible<json, std::pair<std::string, NotSerializableData>>::value, "");
+        static_assert(!std::is_constructible<json, std::pair<NotSerializableData, std::string>>::value, "");
+        static_assert(std::is_constructible<json, std::pair<int, std::string>>::value, "");
+    }
+    SECTION("issue #1825 - A tuple<Args..> is json constructible only if all T in Args are json constructible")
+    {
+        static_assert(!std::is_constructible<json, std::tuple<std::string, NotSerializableData>>::value, "");
+        static_assert(!std::is_constructible<json, std::tuple<NotSerializableData, std::string>>::value, "");
+        static_assert(std::is_constructible<json, std::tuple<int, std::string>>::value, "");
+    }
+
+    SECTION("issue #1983 - JSON patch diff for op=add formation is not as per standard (RFC 6902)")
+    {
+        const auto source = R"({ "foo": [ "1", "2" ] })"_json;
+        const auto target = R"({"foo": [ "1", "2", "3" ]})"_json;
+        const auto result = json::diff(source, target);
+        CHECK(result.dump() == R"([{"op":"add","path":"/foo/-","value":"3"}])");
+    }
+
+    SECTION("issue #2067 - cannot serialize binary data to text JSON")
+    {
+        const unsigned char data[] = {0x81, 0xA4, 0x64, 0x61, 0x74, 0x61, 0xC4, 0x0F, 0x33, 0x30, 0x30, 0x32, 0x33, 0x34, 0x30, 0x31, 0x30, 0x37, 0x30, 0x35, 0x30, 0x31, 0x30};
+        json j = json::from_msgpack(data, sizeof(data) / sizeof(data[0]));
+        CHECK_NOTHROW(
+            j.dump(4,                              // Indent
+                   ' ',                            // Indent char
+                   false,                          // Ensure ascii
+                   json::error_handler_t::strict  // Error
+                  )
+        );
+    }
+
+    SECTION("PR #2181 - regression bug with lvalue")
+    {
+        // see https://github.com/nlohmann/json/pull/2181#issuecomment-653326060
+        json j{{"x", "test"}};
+        std::string defval = "default value";
+        auto val = j.value("x", defval);
+        auto val2 = j.value("y", defval);
+    }
+
+    SECTION("issue #2293 - eof doesnt cause parsing to stop")
+    {
+        std::vector<uint8_t> data =
+        {
+            0x7B, 0x6F, 0x62, 0x6A, 0x65, 0x63, 0x74, 0x20, 0x4F, 0x42
+        };
+        json result = json::from_cbor(data, true, false);
+        CHECK(result.is_discarded());
+    }
+
+    SECTION("issue #2315 - json.update and vector<pair>does not work with ordered_json")
+    {
+        nlohmann::ordered_json jsonAnimals = {{"animal", "dog"}};
+        nlohmann::ordered_json jsonCat = {{"animal", "cat"}};
+        jsonAnimals.update(jsonCat);
+        CHECK(jsonAnimals["animal"] == "cat");
+
+        auto jsonAnimals_parsed = nlohmann::ordered_json::parse(jsonAnimals.dump());
+        CHECK(jsonAnimals == jsonAnimals_parsed);
+
+        std::vector<std::pair<std::string, int64_t>> intData = {std::make_pair("aaaa", 11),
+                                                                std::make_pair("bbb", 222)
+                                                               };
+        nlohmann::ordered_json jsonObj;
+        for (const auto& data : intData)
+        {
+            jsonObj[data.first] = data.second;
+        }
+        CHECK(jsonObj["aaaa"] == 11);
+        CHECK(jsonObj["bbb"] == 222);
+    }
+
+    SECTION("issue #2330 - ignore_comment=true fails on multiple consecutive lines starting with comments")
+    {
+        std::string ss = "//\n//\n{\n}\n";
+        json j = json::parse(ss, nullptr, true, true);
+        CHECK(j.dump() == "{}");
+    }
+
+#ifdef JSON_HAS_CPP_20
+    SECTION("issue #2546 - parsing containers of std::byte")
+    {
+        const char DATA[] = R"("Hello, world!")";
+        const auto s = std::as_bytes(std::span(DATA));
+        json j = json::parse(s);
+        CHECK(j.dump() == "\"Hello, world!\"");
+    }
+#endif
+}

vendor/json/test/src/unit-serialization.cpp

@@ -0,0 +1,322 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <sstream>
+#include <iomanip>
+
+TEST_CASE("serialization")
+{
+    SECTION("operator<<")
+    {
+        SECTION("no given width")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            ss << j;
+            CHECK(ss.str() == "[\"foo\",1,2,3,false,{\"one\":1}]");
+        }
+
+        SECTION("given width")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            ss << std::setw(4) << j;
+            CHECK(ss.str() ==
+                  "[\n    \"foo\",\n    1,\n    2,\n    3,\n    false,\n    {\n        \"one\": 1\n    }\n]");
+        }
+
+        SECTION("given fill")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            ss << std::setw(1) << std::setfill('\t') << j;
+            CHECK(ss.str() ==
+                  "[\n\t\"foo\",\n\t1,\n\t2,\n\t3,\n\tfalse,\n\t{\n\t\t\"one\": 1\n\t}\n]");
+        }
+    }
+
+    SECTION("operator>>")
+    {
+        SECTION("no given width")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            j >> ss;
+            CHECK(ss.str() == "[\"foo\",1,2,3,false,{\"one\":1}]");
+        }
+
+        SECTION("given width")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            ss.width(4);
+            j >> ss;
+            CHECK(ss.str() ==
+                  "[\n    \"foo\",\n    1,\n    2,\n    3,\n    false,\n    {\n        \"one\": 1\n    }\n]");
+        }
+
+        SECTION("given fill")
+        {
+            std::stringstream ss;
+            json j = {"foo", 1, 2, 3, false, {{"one", 1}}};
+            ss.width(1);
+            ss.fill('\t');
+            j >> ss;
+            CHECK(ss.str() ==
+                  "[\n\t\"foo\",\n\t1,\n\t2,\n\t3,\n\tfalse,\n\t{\n\t\t\"one\": 1\n\t}\n]");
+        }
+    }
+
+    SECTION("dump")
+    {
+        SECTION("invalid character")
+        {
+            json j = "ä\xA9ü";
+
+            CHECK_THROWS_AS(j.dump(), json::type_error&);
+            CHECK_THROWS_WITH(j.dump(), "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9");
+            CHECK_THROWS_AS(j.dump(1, ' ', false, json::error_handler_t::strict), json::type_error&);
+            CHECK_THROWS_WITH(j.dump(1, ' ', false, json::error_handler_t::strict), "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9");
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"äü\"");
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"ä\xEF\xBF\xBDü\"");
+            CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"\\u00e4\\ufffd\\u00fc\"");
+        }
+
+        SECTION("ending with incomplete character")
+        {
+            json j = "123\xC2";
+
+            CHECK_THROWS_AS(j.dump(), json::type_error&);
+            CHECK_THROWS_WITH(j.dump(), "[json.exception.type_error.316] incomplete UTF-8 string; last byte: 0xC2");
+            CHECK_THROWS_AS(j.dump(1, ' ', false, json::error_handler_t::strict), json::type_error&);
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"123\"");
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"123\xEF\xBF\xBD\"");
+            CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"123\\ufffd\"");
+        }
+
+        SECTION("unexpected character")
+        {
+            json j = "123\xF1\xB0\x34\x35\x36";
+
+            CHECK_THROWS_AS(j.dump(), json::type_error&);
+            CHECK_THROWS_WITH(j.dump(), "[json.exception.type_error.316] invalid UTF-8 byte at index 5: 0x34");
+            CHECK_THROWS_AS(j.dump(1, ' ', false, json::error_handler_t::strict), json::type_error&);
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::ignore) == "\"123456\"");
+            CHECK(j.dump(-1, ' ', false, json::error_handler_t::replace) == "\"123\xEF\xBF\xBD\x34\x35\x36\"");
+            CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"123\\ufffd456\"");
+        }
+
+        SECTION("U+FFFD Substitution of Maximal Subparts")
+        {
+            // Some tests (mostly) from
+            // https://www.unicode.org/versions/Unicode11.0.0/ch03.pdf
+            // Section 3.9 -- U+FFFD Substitution of Maximal Subparts
+
+            auto test = [&](std::string const & input, std::string const & expected)
+            {
+                json j = input;
+                CHECK(j.dump(-1, ' ', true, json::error_handler_t::replace) == "\"" + expected + "\"");
+            };
+
+            test("\xC2", "\\ufffd");
+            test("\xC2\x41\x42", "\\ufffd" "\x41" "\x42");
+            test("\xC2\xF4", "\\ufffd" "\\ufffd");
+
+            test("\xF0\x80\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+            test("\xF1\x80\x80\x41", "\\ufffd" "\x41");
+            test("\xF2\x80\x80\x41", "\\ufffd" "\x41");
+            test("\xF3\x80\x80\x41", "\\ufffd" "\x41");
+            test("\xF4\x80\x80\x41", "\\ufffd" "\x41");
+            test("\xF5\x80\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+
+            test("\xF0\x90\x80\x41", "\\ufffd" "\x41");
+            test("\xF1\x90\x80\x41", "\\ufffd" "\x41");
+            test("\xF2\x90\x80\x41", "\\ufffd" "\x41");
+            test("\xF3\x90\x80\x41", "\\ufffd" "\x41");
+            test("\xF4\x90\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+            test("\xF5\x90\x80\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+
+            test("\xC0\xAF\xE0\x80\xBF\xF0\x81\x82\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+            test("\xED\xA0\x80\xED\xBF\xBF\xED\xAF\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+            test("\xF4\x91\x92\x93\xFF\x41\x80\xBF\x42", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41" "\\ufffd""\\ufffd" "\x42");
+            test("\xE1\x80\xE2\xF0\x91\x92\xF1\xBF\x41", "\\ufffd" "\\ufffd" "\\ufffd" "\\ufffd" "\x41");
+        }
+    }
+
+    SECTION("to_string")
+    {
+        auto test = [&](std::string const & input, std::string const & expected)
+        {
+            using std::to_string;
+            json j = input;
+            CHECK(to_string(j) == "\"" + expected + "\"");
+        };
+
+        test("{\"x\":5,\"y\":6}", "{\\\"x\\\":5,\\\"y\\\":6}");
+        test("{\"x\":[10,null,null,null]}", "{\\\"x\\\":[10,null,null,null]}");
+        test("test", "test");
+        test("[3,\"false\",false]", "[3,\\\"false\\\",false]");
+    }
+}
+
+TEST_CASE_TEMPLATE("serialization for extreme integer values", T, int32_t, uint32_t, int64_t, uint64_t)
+{
+    SECTION("minimum")
+    {
+        constexpr auto minimum = (std::numeric_limits<T>::min)();
+        json j = minimum;
+        CHECK(j.dump() == std::to_string(minimum));
+    }
+
+    SECTION("maximum")
+    {
+        constexpr auto maximum = (std::numeric_limits<T>::max)();
+        json j = maximum;
+        CHECK(j.dump() == std::to_string(maximum));
+    }
+}
+
+TEST_CASE("dump with binary values")
+{
+    auto binary = json::binary({1, 2, 3, 4});
+    auto binary_empty = json::binary({});
+    auto binary_with_subtype = json::binary({1, 2, 3, 4}, 128);
+    auto binary_empty_with_subtype = json::binary({}, 128);
+
+    json object = {{"key", binary}};
+    json object_empty = {{"key", binary_empty}};
+    json object_with_subtype = {{"key", binary_with_subtype}};
+    json object_empty_with_subtype = {{"key", binary_empty_with_subtype}};
+
+    json array = {"value", 1, binary};
+    json array_empty = {"value", 1, binary_empty};
+    json array_with_subtype = {"value", 1, binary_with_subtype};
+    json array_empty_with_subtype = {"value", 1, binary_empty_with_subtype};
+
+    SECTION("normal")
+    {
+        CHECK(binary.dump() == "{\"bytes\":[1,2,3,4],\"subtype\":null}");
+        CHECK(binary_empty.dump() == "{\"bytes\":[],\"subtype\":null}");
+        CHECK(binary_with_subtype.dump() == "{\"bytes\":[1,2,3,4],\"subtype\":128}");
+        CHECK(binary_empty_with_subtype.dump() == "{\"bytes\":[],\"subtype\":128}");
+
+        CHECK(object.dump() == "{\"key\":{\"bytes\":[1,2,3,4],\"subtype\":null}}");
+        CHECK(object_empty.dump() == "{\"key\":{\"bytes\":[],\"subtype\":null}}");
+        CHECK(object_with_subtype.dump() == "{\"key\":{\"bytes\":[1,2,3,4],\"subtype\":128}}");
+        CHECK(object_empty_with_subtype.dump() == "{\"key\":{\"bytes\":[],\"subtype\":128}}");
+
+        CHECK(array.dump() == "[\"value\",1,{\"bytes\":[1,2,3,4],\"subtype\":null}]");
+        CHECK(array_empty.dump() == "[\"value\",1,{\"bytes\":[],\"subtype\":null}]");
+        CHECK(array_with_subtype.dump() == "[\"value\",1,{\"bytes\":[1,2,3,4],\"subtype\":128}]");
+        CHECK(array_empty_with_subtype.dump() == "[\"value\",1,{\"bytes\":[],\"subtype\":128}]");
+    }
+
+    SECTION("pretty-printed")
+    {
+        CHECK(binary.dump(4) == "{\n"
+              "    \"bytes\": [1, 2, 3, 4],\n"
+              "    \"subtype\": null\n"
+              "}");
+        CHECK(binary_empty.dump(4) == "{\n"
+              "    \"bytes\": [],\n"
+              "    \"subtype\": null\n"
+              "}");
+        CHECK(binary_with_subtype.dump(4) == "{\n"
+              "    \"bytes\": [1, 2, 3, 4],\n"
+              "    \"subtype\": 128\n"
+              "}");
+        CHECK(binary_empty_with_subtype.dump(4) == "{\n"
+              "    \"bytes\": [],\n"
+              "    \"subtype\": 128\n"
+              "}");
+
+        CHECK(object.dump(4) == "{\n"
+              "    \"key\": {\n"
+              "        \"bytes\": [1, 2, 3, 4],\n"
+              "        \"subtype\": null\n"
+              "    }\n"
+              "}");
+        CHECK(object_empty.dump(4) == "{\n"
+              "    \"key\": {\n"
+              "        \"bytes\": [],\n"
+              "        \"subtype\": null\n"
+              "    }\n"
+              "}");
+        CHECK(object_with_subtype.dump(4) == "{\n"
+              "    \"key\": {\n"
+              "        \"bytes\": [1, 2, 3, 4],\n"
+              "        \"subtype\": 128\n"
+              "    }\n"
+              "}");
+        CHECK(object_empty_with_subtype.dump(4) == "{\n"
+              "    \"key\": {\n"
+              "        \"bytes\": [],\n"
+              "        \"subtype\": 128\n"
+              "    }\n"
+              "}");
+
+        CHECK(array.dump(4) == "[\n"
+              "    \"value\",\n"
+              "    1,\n"
+              "    {\n"
+              "        \"bytes\": [1, 2, 3, 4],\n"
+              "        \"subtype\": null\n"
+              "    }\n"
+              "]");
+        CHECK(array_empty.dump(4) == "[\n"
+              "    \"value\",\n"
+              "    1,\n"
+              "    {\n"
+              "        \"bytes\": [],\n"
+              "        \"subtype\": null\n"
+              "    }\n"
+              "]");
+        CHECK(array_with_subtype.dump(4) == "[\n"
+              "    \"value\",\n"
+              "    1,\n"
+              "    {\n"
+              "        \"bytes\": [1, 2, 3, 4],\n"
+              "        \"subtype\": 128\n"
+              "    }\n"
+              "]");
+        CHECK(array_empty_with_subtype.dump(4) == "[\n"
+              "    \"value\",\n"
+              "    1,\n"
+              "    {\n"
+              "        \"bytes\": [],\n"
+              "        \"subtype\": 128\n"
+              "    }\n"
+              "]");
+    }
+}

vendor/json/test/src/unit-to_chars.cpp

@@ -0,0 +1,537 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+// XXX:
+// Only compile these tests if 'float' and 'double' are IEEE-754 single- and
+// double-precision numbers, resp.
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::detail::dtoa_impl::reinterpret_bits;
+
+namespace
+{
+static float make_float(uint32_t sign_bit, uint32_t biased_exponent, uint32_t significand)
+{
+    assert(sign_bit == 0 || sign_bit == 1);
+    assert(biased_exponent <= 0xFF);
+    assert(significand <= 0x007FFFFF);
+
+    uint32_t bits = 0;
+
+    bits |= sign_bit << 31;
+    bits |= biased_exponent << 23;
+    bits |= significand;
+
+    return reinterpret_bits<float>(bits);
+}
+
+// ldexp -- convert f * 2^e to IEEE single precision
+static float make_float(uint64_t f, int e)
+{
+    constexpr uint64_t kHiddenBit               = 0x00800000;
+    constexpr uint64_t kSignificandMask         = 0x007FFFFF;
+    constexpr int      kPhysicalSignificandSize = 23;  // Excludes the hidden bit.
+    constexpr int      kExponentBias            = 0x7F + kPhysicalSignificandSize;
+    constexpr int      kDenormalExponent        = 1 -    kExponentBias;
+    constexpr int      kMaxExponent             = 0xFF - kExponentBias;
+
+    while (f > kHiddenBit + kSignificandMask)
+    {
+        f >>= 1;
+        e++;
+    }
+    if (e >= kMaxExponent)
+    {
+        return std::numeric_limits<float>::infinity();
+    }
+    if (e < kDenormalExponent)
+    {
+        return 0.0;
+    }
+    while (e > kDenormalExponent && (f & kHiddenBit) == 0)
+    {
+        f <<= 1;
+        e--;
+    }
+
+    uint64_t biased_exponent = (e == kDenormalExponent && (f & kHiddenBit) == 0)
+                               ? 0
+                               : static_cast<uint64_t>(e + kExponentBias);
+
+    uint64_t bits = (f & kSignificandMask) | (biased_exponent << kPhysicalSignificandSize);
+    return reinterpret_bits<float>(static_cast<uint32_t>(bits));
+}
+
+static double make_double(uint64_t sign_bit, uint64_t biased_exponent, uint64_t significand)
+{
+    assert(sign_bit == 0 || sign_bit == 1);
+    assert(biased_exponent <= 0x7FF);
+    assert(significand <= 0x000FFFFFFFFFFFFF);
+
+    uint64_t bits = 0;
+
+    bits |= sign_bit << 63;
+    bits |= biased_exponent << 52;
+    bits |= significand;
+
+    return reinterpret_bits<double>(bits);
+}
+
+// ldexp -- convert f * 2^e to IEEE double precision
+static double make_double(uint64_t f, int e)
+{
+    constexpr uint64_t kHiddenBit               = 0x0010000000000000;
+    constexpr uint64_t kSignificandMask         = 0x000FFFFFFFFFFFFF;
+    constexpr int      kPhysicalSignificandSize = 52;  // Excludes the hidden bit.
+    constexpr int      kExponentBias            = 0x3FF + kPhysicalSignificandSize;
+    constexpr int      kDenormalExponent        = 1     - kExponentBias;
+    constexpr int      kMaxExponent             = 0x7FF - kExponentBias;
+
+    while (f > kHiddenBit + kSignificandMask)
+    {
+        f >>= 1;
+        e++;
+    }
+    if (e >= kMaxExponent)
+    {
+        return std::numeric_limits<double>::infinity();
+    }
+    if (e < kDenormalExponent)
+    {
+        return 0.0;
+    }
+    while (e > kDenormalExponent && (f & kHiddenBit) == 0)
+    {
+        f <<= 1;
+        e--;
+    }
+
+    uint64_t biased_exponent = (e == kDenormalExponent && (f & kHiddenBit) == 0)
+                               ? 0
+                               : static_cast<uint64_t>(e + kExponentBias);
+
+    uint64_t bits = (f & kSignificandMask) | (biased_exponent << kPhysicalSignificandSize);
+    return reinterpret_bits<double>(bits);
+}
+}
+
+TEST_CASE("digit gen")
+{
+    SECTION("single precision")
+    {
+        auto check_float = [](float number, const std::string & digits, int expected_exponent)
+        {
+            CAPTURE(number)
+            CAPTURE(digits)
+            CAPTURE(expected_exponent)
+
+            char buf[32];
+            int len = 0;
+            int exponent = 0;
+            nlohmann::detail::dtoa_impl::grisu2(buf, len, exponent, number);
+
+            CHECK(digits == std::string(buf, buf + len));
+            CHECK(expected_exponent == exponent);
+        };
+
+        check_float(make_float(0,   0, 0x00000001),        "1", -45); // min denormal
+        check_float(make_float(0,   0, 0x007FFFFF), "11754942", -45); // max denormal
+        check_float(make_float(0,   1, 0x00000000), "11754944", -45); // min normal
+        check_float(make_float(0,   1, 0x00000001), "11754945", -45);
+        check_float(make_float(0,   1, 0x007FFFFF), "23509886", -45);
+        check_float(make_float(0,   2, 0x00000000), "23509887", -45);
+        check_float(make_float(0,   2, 0x00000001),  "2350989", -44);
+        check_float(make_float(0,  24, 0x00000000), "98607613", -39); // fail if no special case in normalized boundaries
+        check_float(make_float(0,  30, 0x00000000), "63108872", -37); // fail if no special case in normalized boundaries
+        check_float(make_float(0,  31, 0x00000000), "12621775", -36); // fail if no special case in normalized boundaries
+        check_float(make_float(0,  57, 0x00000000), "84703295", -29); // fail if no special case in normalized boundaries
+        check_float(make_float(0, 254, 0x007FFFFE), "34028233",  31);
+        check_float(make_float(0, 254, 0x007FFFFF), "34028235",  31); // max normal
+
+        // V. Paxson and W. Kahan, "A Program for Testing IEEE Binary-Decimal Conversion", manuscript, May 1991,
+        // ftp://ftp.ee.lbl.gov/testbase-report.ps.Z    (report)
+        // ftp://ftp.ee.lbl.gov/testbase.tar.Z          (program)
+
+        // Table 16: Stress Inputs for Converting 24-bit Binary to Decimal, < 1/2 ULP
+        check_float(make_float(12676506, -102),       "25", -25);
+        check_float(make_float(12676506, -103),      "125", -26);
+        check_float(make_float(15445013,   86),     "1195",  30);
+        check_float(make_float(13734123, -138),    "39415", -39);
+        check_float(make_float(12428269, -130),   "913085", -38);
+        check_float(make_float(15334037, -146),  "1719005", -43);
+        check_float(make_float(11518287,  -41), "52379105", -13);
+        check_float(make_float(12584953, -145),  "2821644", -43);
+        check_float(make_float(15961084, -125), "37524328", -38);
+        check_float(make_float(14915817, -146), "16721209", -44);
+        check_float(make_float(10845484, -102), "21388946", -31);
+        check_float(make_float(16431059,  -61),  "7125836", -18);
+
+        // Table 17: Stress Inputs for Converting 24-bit Binary to Decimal, > 1/2 ULP
+        check_float(make_float(16093626,   69),       "95",  26);
+        check_float(make_float( 9983778,   25),      "335",  12);
+        check_float(make_float(12745034,  104),     "2585",  35);
+        check_float(make_float(12706553,   72),    "60005",  24);
+        check_float(make_float(11005028,   45),   "387205",  15);
+        check_float(make_float(15059547,   71),  "3555835",  22);
+        check_float(make_float(16015691,  -99), "25268305", -30);
+        check_float(make_float( 8667859,   56),  "6245851",  17);
+        check_float(make_float(14855922,  -82), "30721327", -25);
+        check_float(make_float(14855922,  -83), "15360663", -25);
+        check_float(make_float(10144164, -110),   "781478", -32);
+        check_float(make_float(13248074,   95), "52481028",  28);
+    }
+
+    SECTION("double precision")
+    {
+        auto check_double = [](double number, const std::string & digits, int expected_exponent)
+        {
+            CAPTURE(number)
+            CAPTURE(digits)
+            CAPTURE(expected_exponent)
+
+            char buf[32];
+            int len = 0;
+            int exponent = 0;
+            nlohmann::detail::dtoa_impl::grisu2(buf, len, exponent, number);
+
+            CHECK(digits == std::string(buf, buf + len));
+            CHECK(expected_exponent == exponent);
+        };
+
+        check_double(make_double(0,    0, 0x0000000000000001),                 "5", -324); // min denormal
+        check_double(make_double(0,    0, 0x000FFFFFFFFFFFFF),  "2225073858507201", -323); // max denormal
+        check_double(make_double(0,    1, 0x0000000000000000), "22250738585072014", -324); // min normal
+        check_double(make_double(0,    1, 0x0000000000000001),  "2225073858507202", -323);
+        check_double(make_double(0,    1, 0x000FFFFFFFFFFFFF), "44501477170144023", -324);
+        check_double(make_double(0,    2, 0x0000000000000000),  "4450147717014403", -323);
+        check_double(make_double(0,    2, 0x0000000000000001),  "4450147717014404", -323);
+        check_double(make_double(0,    4, 0x0000000000000000), "17800590868057611", -323); // fail if no special case in normalized boundaries
+        check_double(make_double(0,    5, 0x0000000000000000), "35601181736115222", -323); // fail if no special case in normalized boundaries
+        check_double(make_double(0,    6, 0x0000000000000000),  "7120236347223045", -322); // fail if no special case in normalized boundaries
+        check_double(make_double(0,   10, 0x0000000000000000), "11392378155556871", -321); // fail if no special case in normalized boundaries
+        check_double(make_double(0, 2046, 0x000FFFFFFFFFFFFE), "17976931348623155",  292);
+        check_double(make_double(0, 2046, 0x000FFFFFFFFFFFFF), "17976931348623157",  292); // max normal
+
+        // Test different paths in DigitGen
+        check_double(                  10000,                 "1",    4);
+        check_double(                1200000,                "12",    5);
+        check_double(4.9406564584124654e-324,                 "5", -324); // exit integral loop
+        check_double(2.2250738585072009e-308,  "2225073858507201", -323); // exit fractional loop
+        check_double(   1.82877982605164e-99,   "182877982605164", -113);
+        check_double( 1.1505466208671903e-09, "11505466208671903",  -25);
+        check_double( 5.5645893133766722e+20,  "5564589313376672",    5);
+        check_double(     53.034830388866226, "53034830388866226",  -15);
+        check_double(  0.0021066531670178605, "21066531670178605",  -19);
+
+        // V. Paxson and W. Kahan, "A Program for Testing IEEE Binary-Decimal Conversion", manuscript, May 1991,
+        // ftp://ftp.ee.lbl.gov/testbase-report.ps.Z    (report)
+        // ftp://ftp.ee.lbl.gov/testbase.tar.Z          (program)
+
+        // Table 3: Stress Inputs for Converting 53-bit Binary to Decimal, < 1/2 ULP
+        check_double(make_double(8511030020275656,  -342) /*                9.5e-088 */,                "95",  -89);
+        check_double(make_double(5201988407066741,  -824) /*               4.65e-233 */,               "465", -235);
+        check_double(make_double(6406892948269899,  +237) /*              1.415e+087 */,              "1415",   84);
+        check_double(make_double(8431154198732492,   +72) /*             3.9815e+037 */,             "39815",   33);
+        check_double(make_double(6475049196144587,   +99) /*            4.10405e+045 */,            "410405",   40);
+        check_double(make_double(8274307542972842,  +726) /*           2.920845e+234 */,           "2920845",  228);
+        check_double(make_double(5381065484265332,  -456) /*          2.8919465e-122 */,          "28919465", -129);
+        check_double(make_double(6761728585499734, -1057) /*         4.37877185e-303 */,         "437877185", -311);
+        check_double(make_double(7976538478610756,  +376) /*        1.227701635e+129 */,        "1227701635",  120);
+        check_double(make_double(5982403858958067,  +377) /*       1.8415524525e+129 */,       "18415524525",  119);
+        check_double(make_double(5536995190630837,   +93) /*      5.48357443505e+043 */,      "548357443505",   32);
+        check_double(make_double(7225450889282194,  +710) /*     3.891901811465e+229 */,     "3891901811465",  217);
+        check_double(make_double(7225450889282194,  +709) /*    1.9459509057325e+229 */,    "19459509057325",  216);
+        check_double(make_double(8703372741147379,  +117) /*   1.44609583816055e+051 */,   "144609583816055",   37);
+        check_double(make_double(8944262675275217, -1001) /*  4.173677474585315e-286 */,  "4173677474585315", -301);
+        check_double(make_double(7459803696087692,  -707) /* 1.1079507728788885e-197 */, "11079507728788885", -213);
+        check_double(make_double(6080469016670379,  -381) /*  1.234550136632744e-099 */,  "1234550136632744", -114);
+        check_double(make_double(8385515147034757,  +721) /* 9.2503171196036502e+232 */,   "925031711960365",  218);
+        check_double(make_double(7514216811389786,  -828) /* 4.1980471502848898e-234 */,   "419804715028489", -248);
+        check_double(make_double(8397297803260511,  -345) /* 1.1716315319786511e-088 */, "11716315319786511", -104);
+        check_double(make_double(6733459239310543,  +202) /* 4.3281007284461249e+076 */,  "4328100728446125",   61);
+        check_double(make_double(8091450587292794,  -473) /* 3.3177101181600311e-127 */,  "3317710118160031", -142);
+
+        // Table 4: Stress Inputs for Converting 53-bit Binary to Decimal, > 1/2 ULP
+        check_double(make_double(6567258882077402,  +952) /*                2.5e+302 */,                "25",  301);
+        check_double(make_double(6712731423444934,  +535) /*               7.55e+176 */,               "755",  174);
+        check_double(make_double(6712731423444934,  +534) /*              3.775e+176 */,              "3775",  173);
+        check_double(make_double(5298405411573037,  -957) /*             4.3495e-273 */,             "43495", -277);
+        check_double(make_double(5137311167659507,  -144) /*            2.30365e-028 */,            "230365",  -33);
+        check_double(make_double(6722280709661868,  +363) /*           1.263005e+125 */,           "1263005",  119);
+        check_double(make_double(5344436398034927,  -169) /*          7.1422105e-036 */,          "71422105",  -43);
+        check_double(make_double(8369123604277281,  -853) /*         1.39345735e-241 */,         "139345735", -249);
+        check_double(make_double(8995822108487663,  -780) /*        1.414634485e-219 */,        "1414634485", -228);
+        check_double(make_double(8942832835564782,  -383) /*       4.5392779195e-100 */,       "45392779195", -110);
+        check_double(make_double(8942832835564782,  -384) /*      2.26963895975e-100 */,      "226963895975", -111);
+        check_double(make_double(8942832835564782,  -385) /*     1.134819479875e-100 */,     "1134819479875", -112);
+        check_double(make_double(6965949469487146,  -249) /*    7.7003665618895e-060 */,    "77003665618895",  -73);
+        check_double(make_double(6965949469487146,  -250) /*   3.85018328094475e-060 */,   "385018328094475",  -74);
+        check_double(make_double(6965949469487146,  -251) /*  1.925091640472375e-060 */,  "1925091640472375",  -75);
+        check_double(make_double(7487252720986826,  +548) /* 6.8985865317742005e+180 */, "68985865317742005",  164);
+        check_double(make_double(5592117679628511,  +164) /* 1.3076622631878654e+065 */, "13076622631878654",   49);
+        check_double(make_double(8887055249355788,  +665) /* 1.3605202075612124e+216 */, "13605202075612124",  200);
+        check_double(make_double(6994187472632449,  +690) /* 3.5928102174759597e+223 */, "35928102174759597",  207);
+        check_double(make_double(8797576579012143,  +588) /* 8.9125197712484552e+192 */,  "8912519771248455",  177);
+        check_double(make_double(7363326733505337,  +272) /* 5.5876975736230114e+097 */, "55876975736230114",   81);
+        check_double(make_double(8549497411294502,  -448) /* 1.1762578307285404e-119 */, "11762578307285404", -135);
+
+        // Table 20: Stress Inputs for Converting 56-bit Binary to Decimal, < 1/2 ULP
+        check_double(make_double(50883641005312716, -172) /* 8.4999999999999993e-036 */,  "8499999999999999",  -51);
+        check_double(make_double(38162730753984537, -170) /* 2.5499999999999999e-035 */,               "255",  -37);
+        check_double(make_double(50832789069151999, -101) /* 2.0049999999999997e-014 */, "20049999999999997",  -30);
+        check_double(make_double(51822367833714164, -109) /* 7.9844999999999994e-017 */,  "7984499999999999",  -32);
+        check_double(make_double(66840152193508133, -172) /* 1.1165499999999999e-035 */, "11165499999999999",  -51);
+        check_double(make_double(55111239245584393, -138) /*           1.581615e-025 */,           "1581615",  -31);
+        check_double(make_double(71704866733321482, -112) /*          1.3809855e-017 */,          "13809855",  -24);
+        check_double(make_double(67160949328233173, -142) /* 1.2046404499999999e-026 */, "12046404499999999",  -42);
+        check_double(make_double(53237141308040189, -152) /* 9.3251405449999991e-030 */,  "9325140544999999",  -45);
+        check_double(make_double(62785329394975786, -112) /*       1.2092014595e-017 */,       "12092014595",  -27);
+        check_double(make_double(48367680154689523,  -77) /* 3.2007045838499998e-007 */,      "320070458385",  -18);
+        check_double(make_double(42552223180606797, -102) /*  8.391946324354999e-015 */,  "8391946324354999",  -30);
+        check_double(make_double(63626356173011241, -112) /*    1.2253990460585e-017 */,    "12253990460585",  -30);
+        check_double(make_double(43566388595783643,  -99) /* 6.8735641489760495e-014 */,   "687356414897605",  -28);
+        check_double(make_double(54512669636675272, -159) /*  7.459816430480385e-032 */,  "7459816430480385",  -47);
+        check_double(make_double(52306490527514614, -167) /* 2.7960588398142552e-034 */,  "2796058839814255",  -49);
+        check_double(make_double(52306490527514614, -168) /* 1.3980294199071276e-034 */, "13980294199071276",  -50);
+        check_double(make_double(41024721590449423,  -89) /* 6.6279012373057359e-011 */,  "6627901237305736",  -26);
+        check_double(make_double(37664020415894738, -132) /* 6.9177880043968072e-024 */,  "6917788004396807",  -39);
+        check_double(make_double(37549883692866294,  -93) /* 3.7915693108349708e-012 */,  "3791569310834971",  -27);
+        check_double(make_double(69124110374399839, -104) /* 3.4080817676591365e-015 */, "34080817676591365",  -31);
+        check_double(make_double(69124110374399839, -105) /* 1.7040408838295683e-015 */, "17040408838295683",  -31);
+
+        // Table 21: Stress Inputs for Converting 56-bit Binary to Decimal, > 1/2 ULP
+        check_double(make_double(49517601571415211,  -94) /* 2.4999999999999998e-012 */,                "25",  -13);
+        check_double(make_double(49517601571415211,  -95) /* 1.2499999999999999e-012 */,               "125",  -14);
+        check_double(make_double(54390733528642804, -133) /* 4.9949999999999996e-024 */, "49949999999999996",  -40); // shortest: 4995e-27
+        check_double(make_double(71805402319113924, -157) /* 3.9304999999999998e-031 */, "39304999999999998",  -47); // shortest: 39305e-35
+        check_double(make_double(40435277969631694, -179) /* 5.2770499999999992e-038 */,  "5277049999999999",  -53);
+        check_double(make_double(57241991568619049, -165) /*           1.223955e-033 */,           "1223955",  -39);
+        check_double(make_double(65224162876242886,  +58) /* 1.8799584999999998e+034 */, "18799584999999998",   18);
+        check_double(make_double(70173376848895368, -138) /*         2.01387715e-025 */,         "201387715",  -33);
+        check_double(make_double(37072848117383207,  -99) /* 5.8490641049999989e-014 */,  "5849064104999999",  -29);
+        check_double(make_double(56845051585389697, -176) /* 5.9349003054999999e-037 */,       "59349003055",  -47);
+        check_double(make_double(54791673366936431, -145) /* 1.2284718039499998e-027 */, "12284718039499998",  -43);
+        check_double(make_double(66800318669106231, -169) /* 8.9270767180849991e-035 */,  "8927076718084999",  -50);
+        check_double(make_double(66800318669106231, -170) /* 4.4635383590424995e-035 */, "44635383590424995",  -51);
+        check_double(make_double(66574323440112438, -119) /* 1.0016990862549499e-019 */, "10016990862549499",  -35);
+        check_double(make_double(65645179969330963, -173) /* 5.4829412628024647e-036 */,  "5482941262802465",  -51);
+        check_double(make_double(61847254334681076, -109) /* 9.5290783281036439e-017 */,  "9529078328103644",  -32);
+        check_double(make_double(39990712921393606, -145) /* 8.9662279366405553e-028 */,  "8966227936640555",  -43);
+        check_double(make_double(59292318184400283, -149) /* 8.3086234418058538e-029 */,  "8308623441805854",  -44);
+        check_double(make_double(69116558615326153, -143) /* 6.1985873566126555e-027 */, "61985873566126555",  -43);
+        check_double(make_double(69116558615326153, -144) /* 3.0992936783063277e-027 */, "30992936783063277",  -43);
+        check_double(make_double(39462549494468513, -152) /* 6.9123512506176015e-030 */,  "6912351250617602",  -45);
+        check_double(make_double(39462549494468513, -153) /* 3.4561756253088008e-030 */,  "3456175625308801",  -45);
+    }
+}
+
+TEST_CASE("formatting")
+{
+    SECTION("single precision")
+    {
+        auto check_float = [](float number, const std::string & expected)
+        {
+            std::array<char, 33> buf{};
+            char* end = nlohmann::detail::to_chars(buf.data(), buf.data() + 32, number);
+            std::string actual(buf.data(), end);
+
+            CHECK(actual == expected);
+        };
+        // %.9g
+        check_float( -1.2345e-22f, "-1.2345e-22"  ); // -1.23450004e-22
+        check_float( -1.2345e-21f, "-1.2345e-21"  ); // -1.23450002e-21
+        check_float( -1.2345e-20f, "-1.2345e-20"  ); // -1.23450002e-20
+        check_float( -1.2345e-19f, "-1.2345e-19"  ); // -1.23449999e-19
+        check_float( -1.2345e-18f, "-1.2345e-18"  ); // -1.23449996e-18
+        check_float( -1.2345e-17f, "-1.2345e-17"  ); // -1.23449998e-17
+        check_float( -1.2345e-16f, "-1.2345e-16"  ); // -1.23449996e-16
+        check_float( -1.2345e-15f, "-1.2345e-15"  ); // -1.23450002e-15
+        check_float( -1.2345e-14f, "-1.2345e-14"  ); // -1.23450004e-14
+        check_float( -1.2345e-13f, "-1.2345e-13"  ); // -1.23449997e-13
+        check_float( -1.2345e-12f, "-1.2345e-12"  ); // -1.23450002e-12
+        check_float( -1.2345e-11f, "-1.2345e-11"  ); // -1.2345e-11
+        check_float( -1.2345e-10f, "-1.2345e-10"  ); // -1.2345e-10
+        check_float( -1.2345e-9f,  "-1.2345e-09"  ); // -1.23449995e-09
+        check_float( -1.2345e-8f,  "-1.2345e-08"  ); // -1.23449997e-08
+        check_float( -1.2345e-7f,  "-1.2345e-07"  ); // -1.23449993e-07
+        check_float( -1.2345e-6f,  "-1.2345e-06"  ); // -1.23450002e-06
+        check_float( -1.2345e-5f,  "-1.2345e-05"  ); // -1.2345e-05
+        check_float( -1.2345e-4f,  "-0.00012345"  ); // -0.000123449994
+        check_float( -1.2345e-3f,  "-0.0012345"   ); // -0.00123449997
+        check_float( -1.2345e-2f,  "-0.012345"    ); // -0.0123450002
+        check_float( -1.2345e-1f,  "-0.12345"     ); // -0.123450004
+        check_float( -0.0f,        "-0.0"         ); // -0
+        check_float(  0.0f,         "0.0"         ); //  0
+        check_float(  1.2345e+0f,   "1.2345"      ); //  1.23450005
+        check_float(  1.2345e+1f,   "12.345"      ); //  12.3450003
+        check_float(  1.2345e+2f,   "123.45"      ); //  123.449997
+        check_float(  1.2345e+3f,   "1234.5"      ); //  1234.5
+        check_float(  1.2345e+4f,   "12345.0"     ); //  12345
+        check_float(  1.2345e+5f,   "123450.0"    ); //  123450
+        check_float(  1.2345e+6f,   "1.2345e+06"  ); //  1234500
+        check_float(  1.2345e+7f,   "1.2345e+07"  ); //  12345000
+        check_float(  1.2345e+8f,   "1.2345e+08"  ); //  123450000
+        check_float(  1.2345e+9f,   "1.2345e+09"  ); //  1.23449997e+09
+        check_float(  1.2345e+10f,  "1.2345e+10"  ); //  1.23449999e+10
+        check_float(  1.2345e+11f,  "1.2345e+11"  ); //  1.23449999e+11
+        check_float(  1.2345e+12f,  "1.2345e+12"  ); //  1.23450006e+12
+        check_float(  1.2345e+13f,  "1.2345e+13"  ); //  1.23449995e+13
+        check_float(  1.2345e+14f,  "1.2345e+14"  ); //  1.23450002e+14
+        check_float(  1.2345e+15f,  "1.2345e+15"  ); //  1.23450003e+15
+        check_float(  1.2345e+16f,  "1.2345e+16"  ); //  1.23449998e+16
+        check_float(  1.2345e+17f,  "1.2345e+17"  ); //  1.23449996e+17
+        check_float(  1.2345e+18f,  "1.2345e+18"  ); //  1.23450004e+18
+        check_float(  1.2345e+19f,  "1.2345e+19"  ); //  1.23449999e+19
+        check_float(  1.2345e+20f,  "1.2345e+20"  ); //  1.23449999e+20
+        check_float(  1.2345e+21f,  "1.2345e+21"  ); //  1.23449999e+21
+        check_float(  1.2345e+22f,  "1.2345e+22"  ); //  1.23450005e+22
+    }
+
+    SECTION("double precision")
+    {
+        auto check_double = [](double number, const std::string & expected)
+        {
+            std::array<char, 33> buf{};
+            char* end = nlohmann::detail::to_chars(buf.data(), buf.data() + 32, number);
+            std::string actual(buf.data(), end);
+
+            CHECK(actual == expected);
+        };
+        //                           dtoa                           %.15g                     %.17g                     shortest
+        check_double( -1.2345e-22,  "-1.2345e-22"             ); // -1.2345e-22               -1.2345000000000001e-22   -1.2345e-22
+        check_double( -1.2345e-21,  "-1.2345e-21"             ); // -1.2345e-21               -1.2345000000000001e-21   -1.2345e-21
+        check_double( -1.2345e-20,  "-1.2345e-20"             ); // -1.2345e-20               -1.2345e-20               -1.2345e-20
+        check_double( -1.2345e-19,  "-1.2345e-19"             ); // -1.2345e-19               -1.2345000000000001e-19   -1.2345e-19
+        check_double( -1.2345e-18,  "-1.2345e-18"             ); // -1.2345e-18               -1.2345000000000001e-18   -1.2345e-18
+        check_double( -1.2345e-17,  "-1.2345e-17"             ); // -1.2345e-17               -1.2345e-17               -1.2345e-17
+        check_double( -1.2345e-16,  "-1.2345e-16"             ); // -1.2345e-16               -1.2344999999999999e-16   -1.2345e-16
+        check_double( -1.2345e-15,  "-1.2345e-15"             ); // -1.2345e-15               -1.2345e-15               -1.2345e-15
+        check_double( -1.2345e-14,  "-1.2345e-14"             ); // -1.2345e-14               -1.2345e-14               -1.2345e-14
+        check_double( -1.2345e-13,  "-1.2345e-13"             ); // -1.2345e-13               -1.2344999999999999e-13   -1.2345e-13
+        check_double( -1.2345e-12,  "-1.2345e-12"             ); // -1.2345e-12               -1.2345e-12               -1.2345e-12
+        check_double( -1.2345e-11,  "-1.2345e-11"             ); // -1.2345e-11               -1.2345e-11               -1.2345e-11
+        check_double( -1.2345e-10,  "-1.2345e-10"             ); // -1.2345e-10               -1.2345e-10               -1.2345e-10
+        check_double( -1.2345e-9,   "-1.2345e-09"             ); // -1.2345e-09               -1.2345e-09               -1.2345e-9
+        check_double( -1.2345e-8,   "-1.2345e-08"             ); // -1.2345e-08               -1.2345000000000001e-08   -1.2345e-8
+        check_double( -1.2345e-7,   "-1.2345e-07"             ); // -1.2345e-07               -1.2345000000000001e-07   -1.2345e-7
+        check_double( -1.2345e-6,   "-1.2345e-06"             ); // -1.2345e-06               -1.2345e-06               -1.2345e-6
+        check_double( -1.2345e-5,   "-1.2345e-05"             ); // -1.2345e-05               -1.2345e-05               -1.2345e-5
+        check_double( -1.2345e-4,   "-0.00012345"             ); // -0.00012345               -0.00012344999999999999   -0.00012345
+        check_double( -1.2345e-3,   "-0.0012345"              ); // -0.0012345                -0.0012344999999999999    -0.0012345
+        check_double( -1.2345e-2,   "-0.012345"               ); // -0.012345                 -0.012345                 -0.012345
+        check_double( -1.2345e-1,   "-0.12345"                ); // -0.12345                  -0.12345                  -0.12345
+        check_double( -0.0,         "-0.0"                    ); // -0                        -0                        -0
+        check_double(  0.0,          "0.0"                    ); //  0                         0                         0
+        check_double(  1.2345e+0,    "1.2345"                 ); //  1.2345                    1.2344999999999999        1.2345
+        check_double(  1.2345e+1,    "12.345"                 ); //  12.345                    12.345000000000001        12.345
+        check_double(  1.2345e+2,    "123.45"                 ); //  123.45                    123.45                    123.45
+        check_double(  1.2345e+3,    "1234.5"                 ); //  1234.5                    1234.5                    1234.5
+        check_double(  1.2345e+4,    "12345.0"                ); //  12345                     12345                     12345
+        check_double(  1.2345e+5,    "123450.0"               ); //  123450                    123450                    123450
+        check_double(  1.2345e+6,    "1234500.0"              ); //  1234500                   1234500                   1234500
+        check_double(  1.2345e+7,    "12345000.0"             ); //  12345000                  12345000                  12345000
+        check_double(  1.2345e+8,    "123450000.0"            ); //  123450000                 123450000                 123450000
+        check_double(  1.2345e+9,    "1234500000.0"           ); //  1234500000                1234500000                1234500000
+        check_double(  1.2345e+10,   "12345000000.0"          ); //  12345000000               12345000000               12345000000
+        check_double(  1.2345e+11,   "123450000000.0"         ); //  123450000000              123450000000              123450000000
+        check_double(  1.2345e+12,   "1234500000000.0"        ); //  1234500000000             1234500000000             1234500000000
+        check_double(  1.2345e+13,   "12345000000000.0"       ); //  12345000000000            12345000000000            12345000000000
+        check_double(  1.2345e+14,   "123450000000000.0"      ); //  123450000000000           123450000000000           123450000000000
+        check_double(  1.2345e+15,   "1.2345e+15"             ); //  1.2345e+15                1234500000000000          1.2345e15
+        check_double(  1.2345e+16,   "1.2345e+16"             ); //  1.2345e+16                12345000000000000         1.2345e16
+        check_double(  1.2345e+17,   "1.2345e+17"             ); //  1.2345e+17                1.2345e+17                1.2345e17
+        check_double(  1.2345e+18,   "1.2345e+18"             ); //  1.2345e+18                1.2345e+18                1.2345e18
+        check_double(  1.2345e+19,   "1.2345e+19"             ); //  1.2345e+19                1.2345e+19                1.2345e19
+        check_double(  1.2345e+20,   "1.2345e+20"             ); //  1.2345e+20                1.2345e+20                1.2345e20
+        check_double(  1.2345e+21,   "1.2344999999999999e+21" ); //  1.2345e+21                1.2344999999999999e+21    1.2345e21
+        check_double(  1.2345e+22,   "1.2345e+22"             ); //  1.2345e+22                1.2345e+22                1.2345e22
+    }
+
+    SECTION("integer")
+    {
+        auto check_integer = [](std::int64_t number, const std::string & expected)
+        {
+            nlohmann::json j = number;
+            CHECK(j.dump() == expected);
+        };
+
+        // edge cases
+        check_integer(INT64_MIN, "-9223372036854775808");
+        check_integer(INT64_MAX, "9223372036854775807");
+
+        // few random big integers
+        check_integer(-3456789012345678901LL, "-3456789012345678901");
+        check_integer(3456789012345678901LL, "3456789012345678901");
+        check_integer(-5678901234567890123LL, "-5678901234567890123");
+        check_integer(5678901234567890123LL, "5678901234567890123");
+
+        // integers with various digit counts
+        check_integer(-1000000000000000000LL, "-1000000000000000000");
+        check_integer(-100000000000000000LL, "-100000000000000000");
+        check_integer(-10000000000000000LL, "-10000000000000000");
+        check_integer(-1000000000000000LL, "-1000000000000000");
+        check_integer(-100000000000000LL, "-100000000000000");
+        check_integer(-10000000000000LL, "-10000000000000");
+        check_integer(-1000000000000LL, "-1000000000000");
+        check_integer(-100000000000LL, "-100000000000");
+        check_integer(-10000000000LL, "-10000000000");
+        check_integer(-1000000000LL, "-1000000000");
+        check_integer(-100000000LL, "-100000000");
+        check_integer(-10000000LL, "-10000000");
+        check_integer(-1000000LL, "-1000000");
+        check_integer(-100000LL, "-100000");
+        check_integer(-10000LL, "-10000");
+        check_integer(-1000LL, "-1000");
+        check_integer(-100LL, "-100");
+        check_integer(-10LL, "-10");
+        check_integer(-1LL, "-1");
+        check_integer(0, "0");
+        check_integer(1LL, "1");
+        check_integer(10LL, "10");
+        check_integer(100LL, "100");
+        check_integer(1000LL, "1000");
+        check_integer(10000LL, "10000");
+        check_integer(100000LL, "100000");
+        check_integer(1000000LL, "1000000");
+        check_integer(10000000LL, "10000000");
+        check_integer(100000000LL, "100000000");
+        check_integer(1000000000LL, "1000000000");
+        check_integer(10000000000LL, "10000000000");
+        check_integer(100000000000LL, "100000000000");
+        check_integer(1000000000000LL, "1000000000000");
+        check_integer(10000000000000LL, "10000000000000");
+        check_integer(100000000000000LL, "100000000000000");
+        check_integer(1000000000000000LL, "1000000000000000");
+        check_integer(10000000000000000LL, "10000000000000000");
+        check_integer(100000000000000000LL, "100000000000000000");
+        check_integer(1000000000000000000LL, "1000000000000000000");
+    }
+}

vendor/json/test/src/unit-udt.cpp

@@ -0,0 +1,845 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <array>
+#include <map>
+#include <string>
+#include <memory>
+
+namespace udt
+{
+enum class country
+{
+    china,
+    france,
+    russia
+};
+
+struct age
+{
+    int m_val;
+    age(int rhs = 0) : m_val(rhs) {}
+};
+
+struct name
+{
+    std::string m_val;
+    name(const std::string rhs = "") : m_val(rhs) {}
+};
+
+struct address
+{
+    std::string m_val;
+    address(const std::string rhs = "") : m_val(rhs) {}
+};
+
+struct person
+{
+    age m_age;
+    name m_name;
+    country m_country;
+    person() : m_age(), m_name(), m_country() {}
+    person(const age& a, const name& n, const country& c) : m_age(a), m_name(n), m_country(c) {}
+};
+
+struct contact
+{
+    person m_person;
+    address m_address;
+    contact() : m_person(), m_address() {}
+    contact(const person& p, const address& a) : m_person(p), m_address(a) {}
+};
+
+struct contact_book
+{
+    name m_book_name;
+    std::vector<contact> m_contacts;
+    contact_book() : m_book_name(), m_contacts() {}
+    contact_book(const name& n, const std::vector<contact>& c) : m_book_name(n), m_contacts(c) {}
+};
+}
+
+// to_json methods
+namespace udt
+{
+// templates because of the custom_json tests (see below)
+template <typename BasicJsonType>
+static void to_json(BasicJsonType& j, age a)
+{
+    j = a.m_val;
+}
+
+template <typename BasicJsonType>
+static void to_json(BasicJsonType& j, const name& n)
+{
+    j = n.m_val;
+}
+
+template <typename BasicJsonType>
+static void to_json(BasicJsonType& j, country c)
+{
+    switch (c)
+    {
+        case country::china:
+            j = "中华人民共和国";
+            return;
+        case country::france:
+            j = "France";
+            return;
+        case country::russia:
+            j = "Российская Федерация";
+            return;
+        default:
+            break;
+    }
+}
+
+template <typename BasicJsonType>
+static void to_json(BasicJsonType& j, const person& p)
+{
+    j = BasicJsonType{{"age", p.m_age}, {"name", p.m_name}, {"country", p.m_country}};
+}
+
+static void to_json(nlohmann::json& j, const address& a)
+{
+    j = a.m_val;
+}
+
+static void to_json(nlohmann::json& j, const contact& c)
+{
+    j = json{{"person", c.m_person}, {"address", c.m_address}};
+}
+
+static void to_json(nlohmann::json& j, const contact_book& cb)
+{
+    j = json{{"name", cb.m_book_name}, {"contacts", cb.m_contacts}};
+}
+
+// operators
+static bool operator==(age lhs, age rhs)
+{
+    return lhs.m_val == rhs.m_val;
+}
+
+static bool operator==(const address& lhs, const address& rhs)
+{
+    return lhs.m_val == rhs.m_val;
+}
+
+static bool operator==(const name& lhs, const name& rhs)
+{
+    return lhs.m_val == rhs.m_val;
+}
+
+static bool operator==(const person& lhs, const person& rhs)
+{
+    return std::tie(lhs.m_name, lhs.m_age) == std::tie(rhs.m_name, rhs.m_age);
+}
+
+static bool operator==(const contact& lhs, const contact& rhs)
+{
+    return std::tie(lhs.m_person, lhs.m_address) ==
+           std::tie(rhs.m_person, rhs.m_address);
+}
+
+static bool operator==(const contact_book& lhs, const contact_book& rhs)
+{
+    return std::tie(lhs.m_book_name, lhs.m_contacts) ==
+           std::tie(rhs.m_book_name, rhs.m_contacts);
+}
+}
+
+// from_json methods
+namespace udt
+{
+template <typename BasicJsonType>
+static void from_json(const BasicJsonType& j, age& a)
+{
+    a.m_val = j.template get<int>();
+}
+
+template <typename BasicJsonType>
+static void from_json(const BasicJsonType& j, name& n)
+{
+    n.m_val = j.template get<std::string>();
+}
+
+template <typename BasicJsonType>
+static void from_json(const BasicJsonType& j, country& c)
+{
+    const auto str = j.template get<std::string>();
+    static const std::map<std::string, country> m =
+    {
+        {"中华人民共和国", country::china},
+        {"France", country::france},
+        {"Российская Федерация", country::russia}
+    };
+
+    const auto it = m.find(str);
+    // TODO test exceptions
+    c = it->second;
+}
+
+template <typename BasicJsonType>
+static void from_json(const BasicJsonType& j, person& p)
+{
+    p.m_age = j["age"].template get<age>();
+    p.m_name = j["name"].template get<name>();
+    p.m_country = j["country"].template get<country>();
+}
+
+static void from_json(const nlohmann::json& j, address& a)
+{
+    a.m_val = j.get<std::string>();
+}
+
+static void from_json(const nlohmann::json& j, contact& c)
+{
+    c.m_person = j["person"].get<person>();
+    c.m_address = j["address"].get<address>();
+}
+
+static void from_json(const nlohmann::json& j, contact_book& cb)
+{
+    cb.m_book_name = j["name"].get<name>();
+    cb.m_contacts = j["contacts"].get<std::vector<contact>>();
+}
+}
+
+TEST_CASE("basic usage" * doctest::test_suite("udt"))
+{
+
+    // a bit narcissistic maybe :) ?
+    const udt::age a
+    {
+        23
+    };
+    const udt::name n{"theo"};
+    const udt::country c{udt::country::france};
+    const udt::person sfinae_addict{a, n, c};
+    const udt::person senior_programmer{{42}, {"王芳"}, udt::country::china};
+    const udt::address addr{"Paris"};
+    const udt::contact cpp_programmer{sfinae_addict, addr};
+    const udt::contact_book book{{"C++"}, {cpp_programmer, {senior_programmer, addr}}};
+
+    SECTION("conversion to json via free-functions")
+    {
+        CHECK(json(a) == json(23));
+        CHECK(json(n) == json("theo"));
+        CHECK(json(c) == json("France"));
+        CHECK(json(sfinae_addict) == R"({"name":"theo", "age":23, "country":"France"})"_json);
+        CHECK(json("Paris") == json(addr));
+        CHECK(json(cpp_programmer) ==
+              R"({"person" : {"age":23, "name":"theo", "country":"France"}, "address":"Paris"})"_json);
+
+        CHECK(
+            json(book) ==
+            R"({"name":"C++", "contacts" : [{"person" : {"age":23, "name":"theo", "country":"France"}, "address":"Paris"}, {"person" : {"age":42, "country":"中华人民共和国", "name":"王芳"}, "address":"Paris"}]})"_json);
+
+    }
+
+    SECTION("conversion from json via free-functions")
+    {
+        const auto big_json =
+            R"({"name":"C++", "contacts" : [{"person" : {"age":23, "name":"theo", "country":"France"}, "address":"Paris"}, {"person" : {"age":42, "country":"中华人民共和国", "name":"王芳"}, "address":"Paris"}]})"_json;
+        SECTION("via explicit calls to get")
+        {
+            const auto parsed_book = big_json.get<udt::contact_book>();
+            const auto book_name = big_json["name"].get<udt::name>();
+            const auto contacts =
+                big_json["contacts"].get<std::vector<udt::contact>>();
+            const auto contact_json = big_json["contacts"].at(0);
+            const auto contact = contact_json.get<udt::contact>();
+            const auto person = contact_json["person"].get<udt::person>();
+            const auto address = contact_json["address"].get<udt::address>();
+            const auto age = contact_json["person"]["age"].get<udt::age>();
+            const auto country =
+                contact_json["person"]["country"].get<udt::country>();
+            const auto name = contact_json["person"]["name"].get<udt::name>();
+
+            CHECK(age == a);
+            CHECK(name == n);
+            CHECK(country == c);
+            CHECK(address == addr);
+            CHECK(person == sfinae_addict);
+            CHECK(contact == cpp_programmer);
+            CHECK(contacts == book.m_contacts);
+            CHECK(book_name == udt::name{"C++"});
+            CHECK(book == parsed_book);
+        }
+
+        SECTION("via explicit calls to get_to")
+        {
+            udt::person person;
+            udt::name name;
+
+            json person_json = big_json["contacts"][0]["person"];
+            CHECK(person_json.get_to(person) == sfinae_addict);
+
+            // correct reference gets returned
+            person_json["name"].get_to(name).m_val = "new name";
+            CHECK(name.m_val == "new name");
+        }
+
+#if JSON_USE_IMPLICIT_CONVERSIONS
+        SECTION("implicit conversions")
+        {
+            const udt::contact_book parsed_book = big_json;
+            const udt::name book_name = big_json["name"];
+            const std::vector<udt::contact> contacts = big_json["contacts"];
+            const auto contact_json = big_json["contacts"].at(0);
+            const udt::contact contact = contact_json;
+            const udt::person person = contact_json["person"];
+            const udt::address address = contact_json["address"];
+            const udt::age age = contact_json["person"]["age"];
+            const udt::country country = contact_json["person"]["country"];
+            const udt::name name = contact_json["person"]["name"];
+
+            CHECK(age == a);
+            CHECK(name == n);
+            CHECK(country == c);
+            CHECK(address == addr);
+            CHECK(person == sfinae_addict);
+            CHECK(contact == cpp_programmer);
+            CHECK(contacts == book.m_contacts);
+            CHECK(book_name == udt::name{"C++"});
+            CHECK(book == parsed_book);
+        }
+#endif
+    }
+}
+
+namespace udt
+{
+struct legacy_type
+{
+    std::string number;
+    legacy_type() : number() {}
+    legacy_type(const std::string& n) : number(n) {}
+};
+}
+
+namespace nlohmann
+{
+template <typename T>
+struct adl_serializer<std::shared_ptr<T>>
+{
+    static void to_json(json& j, const std::shared_ptr<T>& opt)
+    {
+        if (opt)
+        {
+            j = *opt;
+        }
+        else
+        {
+            j = nullptr;
+        }
+    }
+
+    static void from_json(const json& j, std::shared_ptr<T>& opt)
+    {
+        if (j.is_null())
+        {
+            opt = nullptr;
+        }
+        else
+        {
+            opt.reset(new T(j.get<T>()));
+        }
+    }
+};
+
+template <>
+struct adl_serializer<udt::legacy_type>
+{
+    static void to_json(json& j, const udt::legacy_type& l)
+    {
+        j = std::stoi(l.number);
+    }
+
+    static void from_json(const json& j, udt::legacy_type& l)
+    {
+        l.number = std::to_string(j.get<int>());
+    }
+};
+}
+
+TEST_CASE("adl_serializer specialization" * doctest::test_suite("udt"))
+{
+    SECTION("partial specialization")
+    {
+        SECTION("to_json")
+        {
+            std::shared_ptr<udt::person> optPerson;
+
+            json j = optPerson;
+            CHECK(j.is_null());
+
+            optPerson.reset(new udt::person{{42}, {"John Doe"}, udt::country::russia});
+            j = optPerson;
+            CHECK_FALSE(j.is_null());
+
+            CHECK(j.get<udt::person>() == *optPerson);
+        }
+
+        SECTION("from_json")
+        {
+            auto person = udt::person{{42}, {"John Doe"}, udt::country::russia};
+            json j = person;
+
+            auto optPerson = j.get<std::shared_ptr<udt::person>>();
+            REQUIRE(optPerson);
+            CHECK(*optPerson == person);
+
+            j = nullptr;
+            optPerson = j.get<std::shared_ptr<udt::person>>();
+            CHECK(!optPerson);
+        }
+    }
+
+    SECTION("total specialization")
+    {
+        SECTION("to_json")
+        {
+            udt::legacy_type lt{"4242"};
+
+            json j = lt;
+            CHECK(j.get<int>() == 4242);
+        }
+
+        SECTION("from_json")
+        {
+            json j = 4242;
+            auto lt = j.get<udt::legacy_type>();
+            CHECK(lt.number == "4242");
+        }
+    }
+}
+
+namespace nlohmann
+{
+template <>
+struct adl_serializer<std::vector<float>>
+{
+    using type = std::vector<float>;
+    static void to_json(json& j, const type&)
+    {
+        j = "hijacked!";
+    }
+
+    static void from_json(const json&, type& opt)
+    {
+        opt = {42.0, 42.0, 42.0};
+    }
+
+    // preferred version
+    static type from_json(const json&)
+    {
+        return {4.0, 5.0, 6.0};
+    }
+};
+}
+
+TEST_CASE("even supported types can be specialized" * doctest::test_suite("udt"))
+{
+    json j = std::vector<float> {1.0, 2.0, 3.0};
+    CHECK(j.dump() == R"("hijacked!")");
+    auto f = j.get<std::vector<float>>();
+    // the single argument from_json method is preferred
+    CHECK((f == std::vector<float> {4.0, 5.0, 6.0}));
+}
+
+namespace nlohmann
+{
+template <typename T>
+struct adl_serializer<std::unique_ptr<T>>
+{
+    static void to_json(json& j, const std::unique_ptr<T>& opt)
+    {
+        if (opt)
+        {
+            j = *opt;
+        }
+        else
+        {
+            j = nullptr;
+        }
+    }
+
+    // this is the overload needed for non-copyable types,
+    static std::unique_ptr<T> from_json(const json& j)
+    {
+        if (j.is_null())
+        {
+            return nullptr;
+        }
+        else
+        {
+            return std::unique_ptr<T>(new T(j.get<T>()));
+        }
+    }
+};
+}
+
+TEST_CASE("Non-copyable types" * doctest::test_suite("udt"))
+{
+    SECTION("to_json")
+    {
+        std::unique_ptr<udt::person> optPerson;
+
+        json j = optPerson;
+        CHECK(j.is_null());
+
+        optPerson.reset(new udt::person{{42}, {"John Doe"}, udt::country::russia});
+        j = optPerson;
+        CHECK_FALSE(j.is_null());
+
+        CHECK(j.get<udt::person>() == *optPerson);
+    }
+
+    SECTION("from_json")
+    {
+        auto person = udt::person{{42}, {"John Doe"}, udt::country::russia};
+        json j = person;
+
+        auto optPerson = j.get<std::unique_ptr<udt::person>>();
+        REQUIRE(optPerson);
+        CHECK(*optPerson == person);
+
+        j = nullptr;
+        optPerson = j.get<std::unique_ptr<udt::person>>();
+        CHECK(!optPerson);
+    }
+}
+
+// custom serializer - advanced usage
+// pack structs that are pod-types (but not scalar types)
+// relies on adl for any other type
+template <typename T, typename = void>
+struct pod_serializer
+{
+    // use adl for non-pods, or scalar types
+    template <
+        typename BasicJsonType, typename U = T,
+        typename std::enable_if <
+            !(std::is_pod<U>::value && std::is_class<U>::value), int >::type = 0 >
+    static void from_json(const BasicJsonType& j, U& t)
+    {
+        using nlohmann::from_json;
+        from_json(j, t);
+    }
+
+    // special behaviour for pods
+    template < typename BasicJsonType, typename U = T,
+               typename std::enable_if <
+                   std::is_pod<U>::value && std::is_class<U>::value, int >::type = 0 >
+    static void from_json(const  BasicJsonType& j, U& t)
+    {
+        std::uint64_t value;
+        // TODO The following block is no longer relevant in this serializer, make another one that shows the issue
+        // the problem arises only when one from_json method is defined without any constraint
+        //
+        // Why cannot we simply use: j.get<std::uint64_t>() ?
+        // Well, with the current experiment, the get method looks for a from_json
+        // function, which we are currently defining!
+        // This would end up in a stack overflow. Calling nlohmann::from_json is a
+        // workaround (is it?).
+        // I shall find a good way to avoid this once all constructors are converted
+        // to free methods
+        //
+        // In short, constructing a json by constructor calls to_json
+        // calling get calls from_json, for now, we cannot do this in custom
+        // serializers
+        nlohmann::from_json(j, value);
+        auto bytes = static_cast<char*>(static_cast<void*>(&value));
+        std::memcpy(&t, bytes, sizeof(value));
+    }
+
+    template <
+        typename BasicJsonType, typename U = T,
+        typename std::enable_if <
+            !(std::is_pod<U>::value && std::is_class<U>::value), int >::type = 0 >
+    static void to_json(BasicJsonType& j, const  T& t)
+    {
+        using nlohmann::to_json;
+        to_json(j, t);
+    }
+
+    template < typename BasicJsonType, typename U = T,
+               typename std::enable_if <
+                   std::is_pod<U>::value && std::is_class<U>::value, int >::type = 0 >
+    static void to_json(BasicJsonType& j, const  T& t) noexcept
+    {
+        auto bytes = static_cast< const unsigned char*>(static_cast<const void*>(&t));
+        std::uint64_t value;
+        std::memcpy(&value, bytes, sizeof(value));
+        nlohmann::to_json(j, value);
+    }
+};
+
+namespace udt
+{
+struct small_pod
+{
+    int begin;
+    char middle;
+    short end;
+};
+
+struct non_pod
+{
+    std::string s;
+    non_pod() : s() {}
+    non_pod(const std::string& S) : s(S) {}
+};
+
+template <typename BasicJsonType>
+static void to_json(BasicJsonType& j, const non_pod& np)
+{
+    j = np.s;
+}
+
+template <typename BasicJsonType>
+static void from_json(const BasicJsonType& j, non_pod& np)
+{
+    np.s = j.template get<std::string>();
+}
+
+static bool operator==(small_pod lhs, small_pod rhs) noexcept
+{
+    return std::tie(lhs.begin, lhs.middle, lhs.end) ==
+           std::tie(rhs.begin, rhs.middle, rhs.end);
+}
+
+static bool operator==(const  non_pod& lhs, const  non_pod& rhs) noexcept
+{
+    return lhs.s == rhs.s;
+}
+
+static std::ostream& operator<<(std::ostream& os, small_pod l)
+{
+    return os << "begin: " << l.begin << ", middle: " << l.middle << ", end: " << l.end;
+}
+}
+
+TEST_CASE("custom serializer for pods" * doctest::test_suite("udt"))
+{
+    using custom_json =
+        nlohmann::basic_json<std::map, std::vector, std::string, bool,
+        std::int64_t, std::uint64_t, double, std::allocator, pod_serializer>;
+
+    auto p = udt::small_pod{42, '/', 42};
+    custom_json j = p;
+
+    auto p2 = j.get<udt::small_pod>();
+
+    CHECK(p == p2);
+
+    auto np = udt::non_pod{{"non-pod"}};
+    custom_json j2 = np;
+    auto np2 = j2.get<udt::non_pod>();
+    CHECK(np == np2);
+}
+
+template <typename T, typename>
+struct another_adl_serializer;
+
+using custom_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, double, std::allocator, another_adl_serializer>;
+
+template <typename T, typename>
+struct another_adl_serializer
+{
+    static void from_json(const custom_json& j, T& t)
+    {
+        using nlohmann::from_json;
+        from_json(j, t);
+    }
+
+    static void to_json(custom_json& j, const T& t)
+    {
+        using nlohmann::to_json;
+        to_json(j, t);
+    }
+};
+
+TEST_CASE("custom serializer that does adl by default" * doctest::test_suite("udt"))
+{
+    auto me = udt::person{{23}, {"theo"}, udt::country::france};
+
+    json j = me;
+    custom_json cj = me;
+
+    CHECK(j.dump() == cj.dump());
+
+    CHECK(me == j.get<udt::person>());
+    CHECK(me == cj.get<udt::person>());
+}
+
+TEST_CASE("different basic_json types conversions")
+{
+    SECTION("null")
+    {
+        json j;
+        custom_json cj = j;
+        CHECK(cj == nullptr);
+    }
+
+    SECTION("boolean")
+    {
+        json j = true;
+        custom_json cj = j;
+        CHECK(cj == true);
+    }
+
+    SECTION("discarded")
+    {
+        json j(json::value_t::discarded);
+        custom_json cj;
+        CHECK_NOTHROW(cj = j);
+        CHECK(cj.type() == custom_json::value_t::discarded);
+    }
+
+    SECTION("array")
+    {
+        json j = {1, 2, 3};
+        custom_json cj = j;
+        CHECK((cj == std::vector<int> {1, 2, 3}));
+    }
+
+    SECTION("integer")
+    {
+        json j = 42;
+        custom_json cj = j;
+        CHECK(cj == 42);
+    }
+
+    SECTION("float")
+    {
+        json j = 42.0;
+        custom_json cj = j;
+        CHECK(cj == 42.0);
+    }
+
+    SECTION("unsigned")
+    {
+        json j = 42u;
+        custom_json cj = j;
+        CHECK(cj == 42u);
+    }
+
+    SECTION("string")
+    {
+        json j = "forty-two";
+        custom_json cj = j;
+        CHECK(cj == "forty-two");
+    }
+
+    SECTION("binary")
+    {
+        json j = json::binary({1, 2, 3}, 42);
+        custom_json cj = j;
+        CHECK(cj.get_binary().subtype() == 42);
+        std::vector<std::uint8_t> cv = cj.get_binary();
+        std::vector<std::uint8_t> v = j.get_binary();
+        CHECK(cv == v);
+    }
+
+    SECTION("object")
+    {
+        json j = {{"forty", "two"}};
+        custom_json cj = j;
+        auto m = j.get<std::map<std::string, std::string>>();
+        CHECK(cj == m);
+    }
+
+    SECTION("get<custom_json>")
+    {
+        json j = 42;
+        custom_json cj = j.get<custom_json>();
+        CHECK(cj == 42);
+    }
+}
+
+namespace
+{
+struct incomplete;
+
+// std::is_constructible is broken on macOS' libc++
+// use the cppreference implementation
+
+template <typename T, typename = void>
+struct is_constructible_patched : std::false_type {};
+
+template <typename T>
+struct is_constructible_patched<T, decltype(void(json(std::declval<T>())))> : std::true_type {};
+}
+
+TEST_CASE("an incomplete type does not trigger a compiler error in non-evaluated context" * doctest::test_suite("udt"))
+{
+    static_assert(!is_constructible_patched<json, incomplete>::value, "");
+}
+
+namespace
+{
+class Evil
+{
+  public:
+    Evil() = default;
+    template <typename T>
+    Evil(T t) : m_i(sizeof(t)) {}
+
+    int m_i = 0;
+};
+
+void from_json(const json&, Evil&) {}
+}
+
+TEST_CASE("Issue #924")
+{
+    // Prevent get<std::vector<Evil>>() to throw
+    auto j = json::array();
+
+    CHECK_NOTHROW(j.get<Evil>());
+    CHECK_NOTHROW(j.get<std::vector<Evil>>());
+
+    // silence Wunused-template warnings
+    Evil e(1);
+    CHECK(e.m_i >= 0);
+}
+
+TEST_CASE("Issue #1237")
+{
+    struct non_convertible_type {};
+    static_assert(!std::is_convertible<json, non_convertible_type>::value, "");
+}

vendor/json/test/src/unit-udt_macro.cpp

@@ -0,0 +1,330 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+namespace persons
+{
+class person_with_private_data
+{
+  private:
+    std::string name = "";
+    int age = 0;
+    json metadata = nullptr;
+
+  public:
+    bool operator==(const person_with_private_data& rhs) const
+    {
+        return name == rhs.name && age == rhs.age && metadata == rhs.metadata;
+    }
+
+    person_with_private_data() = default;
+    person_with_private_data(std::string name_, int age_, json metadata_)
+        : name(std::move(name_))
+        , age(age_)
+        , metadata(std::move(metadata_))
+    {}
+
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_with_private_data, age, name, metadata)
+};
+
+class person_without_private_data_1
+{
+  public:
+    std::string name = "";
+    int age = 0;
+    json metadata = nullptr;
+
+    bool operator==(const person_without_private_data_1& rhs) const
+    {
+        return name == rhs.name && age == rhs.age && metadata == rhs.metadata;
+    }
+
+    person_without_private_data_1() = default;
+    person_without_private_data_1(std::string name_, int age_, json metadata_)
+        : name(std::move(name_))
+        , age(age_)
+        , metadata(std::move(metadata_))
+    {}
+
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_without_private_data_1, age, name, metadata)
+};
+
+class person_without_private_data_2
+{
+  public:
+    std::string name = "";
+    int age = 0;
+    json metadata = nullptr;
+
+    bool operator==(const person_without_private_data_2& rhs) const
+    {
+        return name == rhs.name && age == rhs.age && metadata == rhs.metadata;
+    }
+
+    person_without_private_data_2() = default;
+    person_without_private_data_2(std::string name_, int age_, json metadata_)
+        : name(std::move(name_))
+        , age(age_)
+        , metadata(std::move(metadata_))
+    {}
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person_without_private_data_2, age, name, metadata)
+
+class person_with_private_alphabet
+{
+  public:
+    bool operator==(const person_with_private_alphabet& other) const
+    {
+        return  a == other.a &&
+                b == other.b &&
+                c == other.c &&
+                d == other.d &&
+                e == other.e &&
+                f == other.f &&
+                g == other.g &&
+                h == other.h &&
+                i == other.i &&
+                j == other.j &&
+                k == other.k &&
+                l == other.l &&
+                m == other.m &&
+                n == other.n &&
+                o == other.o &&
+                p == other.p &&
+                q == other.q &&
+                r == other.r &&
+                s == other.s &&
+                t == other.t &&
+                u == other.u &&
+                v == other.v &&
+                w == other.w &&
+                x == other.x &&
+                y == other.y &&
+                z == other.z;
+    }
+
+  private:
+    int a = 0;
+    int b = 0;
+    int c = 0;
+    int d = 0;
+    int e = 0;
+    int f = 0;
+    int g = 0;
+    int h = 0;
+    int i = 0;
+    int j = 0;
+    int k = 0;
+    int l = 0;
+    int m = 0;
+    int n = 0;
+    int o = 0;
+    int p = 0;
+    int q = 0;
+    int r = 0;
+    int s = 0;
+    int t = 0;
+    int u = 0;
+    int v = 0;
+    int w = 0;
+    int x = 0;
+    int y = 0;
+    int z = 0;
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_with_private_alphabet, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)
+};
+
+class person_with_public_alphabet
+{
+  public:
+    bool operator==(const person_with_public_alphabet& other) const
+    {
+        return  a == other.a &&
+                b == other.b &&
+                c == other.c &&
+                d == other.d &&
+                e == other.e &&
+                f == other.f &&
+                g == other.g &&
+                h == other.h &&
+                i == other.i &&
+                j == other.j &&
+                k == other.k &&
+                l == other.l &&
+                m == other.m &&
+                n == other.n &&
+                o == other.o &&
+                p == other.p &&
+                q == other.q &&
+                r == other.r &&
+                s == other.s &&
+                t == other.t &&
+                u == other.u &&
+                v == other.v &&
+                w == other.w &&
+                x == other.x &&
+                y == other.y &&
+                z == other.z;
+    }
+
+    int a = 0;
+    int b = 0;
+    int c = 0;
+    int d = 0;
+    int e = 0;
+    int f = 0;
+    int g = 0;
+    int h = 0;
+    int i = 0;
+    int j = 0;
+    int k = 0;
+    int l = 0;
+    int m = 0;
+    int n = 0;
+    int o = 0;
+    int p = 0;
+    int q = 0;
+    int r = 0;
+    int s = 0;
+    int t = 0;
+    int u = 0;
+    int v = 0;
+    int w = 0;
+    int x = 0;
+    int y = 0;
+    int z = 0;
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person_with_public_alphabet, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)
+
+} // namespace persons
+
+TEST_CASE_TEMPLATE("Serialization/deserialization via NLOHMANN_DEFINE_TYPE_INTRUSIVE", T,
+                   persons::person_with_private_data,
+                   persons::person_without_private_data_1,
+                   persons::person_without_private_data_2)
+{
+    SECTION("person")
+    {
+        // serialization
+        T p1("Erik", 1, {{"haircuts", 2}});
+        CHECK(json(p1).dump() == "{\"age\":1,\"metadata\":{\"haircuts\":2},\"name\":\"Erik\"}");
+
+        // deserialization
+        auto p2 = json(p1).get<T>();
+        CHECK(p2 == p1);
+
+        // roundtrip
+        CHECK(T(json(p1)) == p1);
+        CHECK(json(T(json(p1))) == json(p1));
+
+        // check exception in case of missing field
+        json j = json(p1);
+        j.erase("age");
+        CHECK_THROWS_WITH_AS(j.get<T>(), "[json.exception.out_of_range.403] key 'age' not found", json::out_of_range);
+    }
+}
+
+TEST_CASE_TEMPLATE("Serialization/deserialization of classes with 26 public/private member variables via NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE", T,
+                   persons::person_with_private_alphabet,
+                   persons::person_with_public_alphabet)
+{
+    SECTION("alphabet")
+    {
+        {
+            T obj1;
+            nlohmann::json j = obj1; //via json object
+            T obj2;
+            j.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+
+        {
+            T obj1;
+            nlohmann::json j1 = obj1; //via json string
+            std::string s = j1.dump();
+            nlohmann::json j2 = nlohmann::json::parse(s);
+            T obj2;
+            j2.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+
+        {
+            T obj1;
+            nlohmann::json j1 = obj1; //via msgpack
+            std::vector<uint8_t> buf = nlohmann::json::to_msgpack(j1);
+            nlohmann::json j2 = nlohmann::json::from_msgpack(buf);
+            T obj2;
+            j2.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+
+        {
+            T obj1;
+            nlohmann::json j1 = obj1; //via bson
+            std::vector<uint8_t> buf = nlohmann::json::to_bson(j1);
+            nlohmann::json j2 = nlohmann::json::from_bson(buf);
+            T obj2;
+            j2.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+
+        {
+            T obj1;
+            nlohmann::json j1 = obj1; //via cbor
+            std::vector<uint8_t> buf = nlohmann::json::to_cbor(j1);
+            nlohmann::json j2 = nlohmann::json::from_cbor(buf);
+            T obj2;
+            j2.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+
+        {
+            T obj1;
+            nlohmann::json j1 = obj1; //via ubjson
+            std::vector<uint8_t> buf = nlohmann::json::to_ubjson(j1);
+            nlohmann::json j2 = nlohmann::json::from_ubjson(buf);
+            T obj2;
+            j2.get_to(obj2);
+            bool ok = (obj1 == obj2);
+            CHECK(ok);
+        }
+    }
+}

vendor/json/test/src/unit-user_defined_input.cpp

@@ -0,0 +1,144 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <list>
+
+namespace
+{
+TEST_CASE("Use arbitrary stdlib container")
+{
+    std::string raw_data = "[1,2,3,4]";
+    std::list<char> data(raw_data.begin(), raw_data.end());
+
+    json as_json = json::parse(data.begin(), data.end());
+    CHECK(as_json.at(0) == 1);
+    CHECK(as_json.at(1) == 2);
+    CHECK(as_json.at(2) == 3);
+    CHECK(as_json.at(3) == 4);
+}
+
+struct MyContainer
+{
+    const char* data;
+};
+
+const char* begin(const MyContainer& c)
+{
+    return c.data;
+}
+
+const char* end(const MyContainer& c)
+{
+    return c.data + strlen(c.data);
+}
+
+TEST_CASE("Custom container non-member begin/end")
+{
+
+    MyContainer data{"[1,2,3,4]"};
+    json as_json = json::parse(data);
+    CHECK(as_json.at(0) == 1);
+    CHECK(as_json.at(1) == 2);
+    CHECK(as_json.at(2) == 3);
+    CHECK(as_json.at(3) == 4);
+
+}
+
+TEST_CASE("Custom container member begin/end")
+{
+    struct MyContainer2
+    {
+        const char* data;
+
+        const char* begin() const
+        {
+            return data;
+        }
+
+        const char* end() const
+        {
+            return data + strlen(data);
+        }
+    };
+
+    MyContainer2 data{"[1,2,3,4]"};
+    json as_json = json::parse(data);
+    CHECK(as_json.at(0) == 1);
+    CHECK(as_json.at(1) == 2);
+    CHECK(as_json.at(2) == 3);
+    CHECK(as_json.at(3) == 4);
+}
+
+TEST_CASE("Custom iterator")
+{
+    const char* raw_data = "[1,2,3,4]";
+
+    struct MyIterator
+    {
+        using difference_type = std::size_t;
+        using value_type = char;
+        using pointer = const char*;
+        using reference = const char&;
+        using iterator_category = std::input_iterator_tag;
+
+        MyIterator& operator++()
+        {
+            ++ptr;
+            return *this;
+        }
+
+        reference operator*() const
+        {
+            return *ptr;
+        }
+
+        bool operator!=(const MyIterator& rhs) const
+        {
+            return ptr != rhs.ptr;
+        }
+
+        const char* ptr;
+    };
+
+    MyIterator begin{raw_data};
+    MyIterator end{raw_data + strlen(raw_data)};
+
+    json as_json = json::parse(begin, end);
+    CHECK(as_json.at(0) == 1);
+    CHECK(as_json.at(1) == 2);
+    CHECK(as_json.at(2) == 3);
+    CHECK(as_json.at(3) == 4);
+}
+
+} // namespace

vendor/json/test/src/unit-wstring.cpp

@@ -0,0 +1,117 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+namespace
+{
+bool wstring_is_utf16();
+bool wstring_is_utf16()
+{
+    return (std::wstring(L"💩") == std::wstring(L"\U0001F4A9"));
+}
+
+bool u16string_is_utf16();
+bool u16string_is_utf16()
+{
+    return (std::u16string(u"💩") == std::u16string(u"\U0001F4A9"));
+}
+
+bool u32string_is_utf32();
+bool u32string_is_utf32()
+{
+    return (std::u32string(U"💩") == std::u32string(U"\U0001F4A9"));
+}
+}
+
+TEST_CASE("wide strings")
+{
+    SECTION("std::wstring")
+    {
+        if (wstring_is_utf16())
+        {
+            std::wstring w = L"[12.2,\"Ⴥaäö💤🧢\"]";
+            json j = json::parse(w);
+            CHECK(j.dump() == "[12.2,\"Ⴥaäö💤🧢\"]");
+        }
+    }
+
+    SECTION("invalid std::wstring")
+    {
+        if (wstring_is_utf16())
+        {
+            std::wstring w = L"\"\xDBFF";
+            json _;
+            CHECK_THROWS_AS(_ = json::parse(w), json::parse_error&);
+        }
+    }
+
+    SECTION("std::u16string")
+    {
+        if (u16string_is_utf16())
+        {
+            std::u16string w = u"[12.2,\"Ⴥaäö💤🧢\"]";
+            json j = json::parse(w);
+            CHECK(j.dump() == "[12.2,\"Ⴥaäö💤🧢\"]");
+        }
+    }
+
+    SECTION("invalid std::u16string")
+    {
+        if (wstring_is_utf16())
+        {
+            std::u16string w = u"\"\xDBFF";
+            json _;
+            CHECK_THROWS_AS(_ = json::parse(w), json::parse_error&);
+        }
+    }
+
+    SECTION("std::u32string")
+    {
+        if (u32string_is_utf32())
+        {
+            std::u32string w = U"[12.2,\"Ⴥaäö💤🧢\"]";
+            json j = json::parse(w);
+            CHECK(j.dump() == "[12.2,\"Ⴥaäö💤🧢\"]");
+        }
+    }
+
+    SECTION("invalid std::u32string")
+    {
+        if (u32string_is_utf32())
+        {
+            std::u32string w = U"\"\x110000";
+            json _;
+            CHECK_THROWS_AS(_ = json::parse(w), json::parse_error&);
+        }
+    }
+}

vendor/json/test/src/unit.cpp

@@ -0,0 +1,31 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.9.1
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+SPDX-License-Identifier: MIT
+Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
+
+Permission is hereby  granted, free of charge, to any  person obtaining a copy
+of this software and associated  documentation files (the "Software"), to deal
+in the Software  without restriction, including without  limitation the rights
+to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
+copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
+IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
+FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
+AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
+LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest_compatibility.h"

vendor/json/test/thirdparty/Fuzzer/CMakeLists.txt

@@ -0,0 +1,45 @@
+set(LIBFUZZER_FLAGS_BASE "${CMAKE_CXX_FLAGS}")
+# Disable the coverage and sanitizer instrumentation for the fuzzer itself.
+set(CMAKE_CXX_FLAGS "${LIBFUZZER_FLAGS_BASE} -fno-sanitize-coverage=trace-pc-guard,edge,trace-cmp,indirect-calls,8bit-counters -Werror")
+if( LLVM_USE_SANITIZE_COVERAGE )
+  if(NOT "${LLVM_USE_SANITIZER}" STREQUAL "Address")
+    message(FATAL_ERROR
+      "LibFuzzer and its tests require LLVM_USE_SANITIZER=Address and "
+      "LLVM_USE_SANITIZE_COVERAGE=YES to be set."
+      )
+  endif()
+  add_library(LLVMFuzzerNoMainObjects OBJECT
+    FuzzerCrossOver.cpp
+    FuzzerDriver.cpp
+    FuzzerExtFunctionsDlsym.cpp
+    FuzzerExtFunctionsWeak.cpp
+    FuzzerExtFunctionsWeakAlias.cpp
+    FuzzerIO.cpp
+    FuzzerIOPosix.cpp
+    FuzzerIOWindows.cpp
+    FuzzerLoop.cpp
+    FuzzerMerge.cpp
+    FuzzerMutate.cpp
+    FuzzerSHA1.cpp
+    FuzzerTracePC.cpp
+    FuzzerTraceState.cpp
+    FuzzerUtil.cpp
+    FuzzerUtilDarwin.cpp
+    FuzzerUtilLinux.cpp
+    FuzzerUtilPosix.cpp
+    FuzzerUtilWindows.cpp
+    )
+  add_library(LLVMFuzzerNoMain STATIC
+    $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
+    )
+  target_link_libraries(LLVMFuzzerNoMain ${PTHREAD_LIB})
+  add_library(LLVMFuzzer STATIC
+    FuzzerMain.cpp
+    $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
+    )
+  target_link_libraries(LLVMFuzzer ${PTHREAD_LIB})
+
+  if( LLVM_INCLUDE_TESTS )
+    add_subdirectory(test)
+  endif()
+endif()

vendor/json/test/thirdparty/Fuzzer/FuzzerCorpus.h

@@ -0,0 +1,217 @@
+//===- FuzzerCorpus.h - Internal header for the Fuzzer ----------*- C++ -* ===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::InputCorpus
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_CORPUS
+#define LLVM_FUZZER_CORPUS
+
+#include "FuzzerDefs.h"
+#include "FuzzerIO.h"
+#include "FuzzerRandom.h"
+#include "FuzzerSHA1.h"
+#include "FuzzerTracePC.h"
+#include <numeric>
+#include <random>
+#include <unordered_set>
+
+namespace fuzzer {
+
+struct InputInfo {
+  Unit U;  // The actual input data.
+  uint8_t Sha1[kSHA1NumBytes];  // Checksum.
+  // Number of features that this input has and no smaller input has.
+  size_t NumFeatures = 0;
+  size_t Tmp = 0; // Used by ValidateFeatureSet.
+  // Stats.
+  size_t NumExecutedMutations = 0;
+  size_t NumSuccessfullMutations = 0;
+  bool MayDeleteFile = false;
+};
+
+class InputCorpus {
+ public:
+  static const size_t kFeatureSetSize = 1 << 16;
+  InputCorpus(const std::string &OutputCorpus) : OutputCorpus(OutputCorpus) {
+    memset(InputSizesPerFeature, 0, sizeof(InputSizesPerFeature));
+    memset(SmallestElementPerFeature, 0, sizeof(SmallestElementPerFeature));
+  }
+  ~InputCorpus() {
+    for (auto II : Inputs)
+      delete II;
+  }
+  size_t size() const { return Inputs.size(); }
+  size_t SizeInBytes() const {
+    size_t Res = 0;
+    for (auto II : Inputs)
+      Res += II->U.size();
+    return Res;
+  }
+  size_t NumActiveUnits() const {
+    size_t Res = 0;
+    for (auto II : Inputs)
+      Res += !II->U.empty();
+    return Res;
+  }
+  bool empty() const { return Inputs.empty(); }
+  const Unit &operator[] (size_t Idx) const { return Inputs[Idx]->U; }
+  void AddToCorpus(const Unit &U, size_t NumFeatures, bool MayDeleteFile = false) {
+    assert(!U.empty());
+    uint8_t Hash[kSHA1NumBytes];
+    if (FeatureDebug)
+      Printf("ADD_TO_CORPUS %zd NF %zd\n", Inputs.size(), NumFeatures);
+    ComputeSHA1(U.data(), U.size(), Hash);
+    Hashes.insert(Sha1ToString(Hash));
+    Inputs.push_back(new InputInfo());
+    InputInfo &II = *Inputs.back();
+    II.U = U;
+    II.NumFeatures = NumFeatures;
+    II.MayDeleteFile = MayDeleteFile;
+    memcpy(II.Sha1, Hash, kSHA1NumBytes);
+    UpdateCorpusDistribution();
+    ValidateFeatureSet();
+  }
+
+  bool HasUnit(const Unit &U) { return Hashes.count(Hash(U)); }
+  bool HasUnit(const std::string &H) { return Hashes.count(H); }
+  InputInfo &ChooseUnitToMutate(Random &Rand) {
+    InputInfo &II = *Inputs[ChooseUnitIdxToMutate(Rand)];
+    assert(!II.U.empty());
+    return II;
+  };
+
+  // Returns an index of random unit from the corpus to mutate.
+  // Hypothesis: units added to the corpus last are more likely to be
+  // interesting. This function gives more weight to the more recent units.
+  size_t ChooseUnitIdxToMutate(Random &Rand) {
+    size_t Idx = static_cast<size_t>(CorpusDistribution(Rand.Get_mt19937()));
+    assert(Idx < Inputs.size());
+    return Idx;
+  }
+
+  void PrintStats() {
+    for (size_t i = 0; i < Inputs.size(); i++) {
+      const auto &II = *Inputs[i];
+      Printf("  [%zd %s]\tsz: %zd\truns: %zd\tsucc: %zd\n", i,
+             Sha1ToString(II.Sha1).c_str(), II.U.size(),
+             II.NumExecutedMutations, II.NumSuccessfullMutations);
+    }
+  }
+
+  void PrintFeatureSet() {
+    for (size_t i = 0; i < kFeatureSetSize; i++) {
+      if(size_t Sz = GetFeature(i))
+        Printf("[%zd: id %zd sz%zd] ", i, SmallestElementPerFeature[i], Sz);
+    }
+    Printf("\n\t");
+    for (size_t i = 0; i < Inputs.size(); i++)
+      if (size_t N = Inputs[i]->NumFeatures)
+        Printf(" %zd=>%zd ", i, N);
+    Printf("\n");
+  }
+
+  void DeleteInput(size_t Idx) {
+    InputInfo &II = *Inputs[Idx];
+    if (!OutputCorpus.empty() && II.MayDeleteFile)
+      RemoveFile(DirPlusFile(OutputCorpus, Sha1ToString(II.Sha1)));
+    Unit().swap(II.U);
+    if (FeatureDebug)
+      Printf("EVICTED %zd\n", Idx);
+  }
+
+  bool AddFeature(size_t Idx, uint32_t NewSize, bool Shrink) {
+    assert(NewSize);
+    Idx = Idx % kFeatureSetSize;
+    uint32_t OldSize = GetFeature(Idx);
+    if (OldSize == 0 || (Shrink && OldSize > NewSize)) {
+      if (OldSize > 0) {
+        size_t OldIdx = SmallestElementPerFeature[Idx];
+        InputInfo &II = *Inputs[OldIdx];
+        assert(II.NumFeatures > 0);
+        II.NumFeatures--;
+        if (II.NumFeatures == 0)
+          DeleteInput(OldIdx);
+      }
+      if (FeatureDebug)
+        Printf("ADD FEATURE %zd sz %d\n", Idx, NewSize);
+      SmallestElementPerFeature[Idx] = Inputs.size();
+      InputSizesPerFeature[Idx] = NewSize;
+      CountingFeatures = true;
+      return true;
+    }
+    return false;
+  }
+
+  size_t NumFeatures() const {
+    size_t Res = 0;
+    for (size_t i = 0; i < kFeatureSetSize; i++)
+      Res += GetFeature(i) != 0;
+    return Res;
+  }
+
+  void ResetFeatureSet() {
+    assert(Inputs.empty());
+    memset(InputSizesPerFeature, 0, sizeof(InputSizesPerFeature));
+    memset(SmallestElementPerFeature, 0, sizeof(SmallestElementPerFeature));
+  }
+
+private:
+
+  static const bool FeatureDebug = false;
+
+  size_t GetFeature(size_t Idx) const { return InputSizesPerFeature[Idx]; }
+
+  void ValidateFeatureSet() {
+    if (!CountingFeatures) return;
+    if (FeatureDebug)
+      PrintFeatureSet();
+    for (size_t Idx = 0; Idx < kFeatureSetSize; Idx++)
+      if (GetFeature(Idx))
+        Inputs[SmallestElementPerFeature[Idx]]->Tmp++;
+    for (auto II: Inputs) {
+      if (II->Tmp != II->NumFeatures)
+        Printf("ZZZ %zd %zd\n", II->Tmp, II->NumFeatures);
+      assert(II->Tmp == II->NumFeatures);
+      II->Tmp = 0;
+    }
+  }
+
+  // Updates the probability distribution for the units in the corpus.
+  // Must be called whenever the corpus or unit weights are changed.
+  void UpdateCorpusDistribution() {
+    size_t N = Inputs.size();
+    Intervals.resize(N + 1);
+    Weights.resize(N);
+    std::iota(Intervals.begin(), Intervals.end(), 0);
+    if (CountingFeatures)
+      for (size_t i = 0; i < N; i++)
+        Weights[i] = Inputs[i]->NumFeatures * (i + 1);
+    else
+      std::iota(Weights.begin(), Weights.end(), 1);
+    CorpusDistribution = std::piecewise_constant_distribution<double>(
+        Intervals.begin(), Intervals.end(), Weights.begin());
+  }
+  std::piecewise_constant_distribution<double> CorpusDistribution;
+
+  std::vector<double> Intervals;
+  std::vector<double> Weights;
+
+  std::unordered_set<std::string> Hashes;
+  std::vector<InputInfo*> Inputs;
+
+  bool CountingFeatures = false;
+  uint32_t InputSizesPerFeature[kFeatureSetSize];
+  uint32_t SmallestElementPerFeature[kFeatureSetSize];
+
+  std::string OutputCorpus;
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_CORPUS