Shamelessly copy Josiah

source/lib/json/tests/CMakeLists.txt

@@ -0,0 +1,184 @@
+cmake_minimum_required(VERSION 3.13...3.14)
+
+option(JSON_Valgrind    "Execute test suite with Valgrind." OFF)
+option(JSON_FastTests   "Skip expensive/slow tests." OFF)
+
+set(JSON_32bitTest     AUTO CACHE STRING "Enable the 32bit unit test (ON/OFF/AUTO/ONLY).")
+set(JSON_TestStandards "" CACHE STRING "The list of standards to test explicitly.")
+
+# using an env var, since this will also affect targets executing cmake (such as "ci_test_compiler_default")
+set(JSON_FORCED_GLOBAL_COMPILE_OPTIONS $ENV{JSON_FORCED_GLOBAL_COMPILE_OPTIONS})
+if (NOT "" STREQUAL "$ENV{JSON_FORCED_GLOBAL_COMPILE_OPTIONS}")
+    add_compile_options($ENV{JSON_FORCED_GLOBAL_COMPILE_OPTIONS})
+endif()
+if (NOT "" STREQUAL "$ENV{JSON_FORCED_GLOBAL_LINK_OPTIONS}")
+    add_link_options($ENV{JSON_FORCED_GLOBAL_LINK_OPTIONS})
+endif()
+
+include(test)
+
+#############################################################################
+# override standard support
+#############################################################################
+
+# Clang only supports C++17 starting from Clang 5.0
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
+    unset(compiler_supports_cpp_17)
+endif()
+# MSVC 2015 (14.0) does not support C++17
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.1)
+    unset(compiler_supports_cpp_17)
+endif()
+
+# Clang C++20 support appears insufficient prior to Clang 9.0 (based on CI build failure)
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+    unset(compiler_supports_cpp_20)
+endif()
+# GCC started supporting C++20 features in 8.0 but a test for #3070 segfaults prior to 9.0
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+    unset(compiler_supports_cpp_20)
+endif()
+
+#############################################################################
+# test_main library with shared code to speed up build and common settings
+#############################################################################
+
+add_library(test_main OBJECT src/unit.cpp)
+target_compile_definitions(test_main PUBLIC
+    DOCTEST_CONFIG_SUPER_FAST_ASSERTS
+    JSON_TEST_KEEP_MACROS
+    JSON_TEST_USING_MULTIPLE_HEADERS=$<BOOL:${JSON_MultipleHeaders}>)
+target_compile_features(test_main PRIVATE cxx_std_11)
+target_compile_options(test_main PUBLIC
+    $<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>
+    # MSVC: Force to always compile with W4
+    #       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<...>::operator <<': was declared deprecated
+    $<$<CXX_COMPILER_ID:MSVC>:/W4 /wd4566 /wd4996>
+    # https://github.com/nlohmann/json/issues/1114
+    $<$<CXX_COMPILER_ID:MSVC>:/bigobj> $<$<BOOL:${MINGW}>:-Wa,-mbig-obj>
+
+    # https://github.com/nlohmann/json/pull/3229
+    $<$<CXX_COMPILER_ID:Intel>:-diag-disable=2196>
+
+    $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-deprecated;-Wno-float-equal>
+    $<$<CXX_COMPILER_ID:GNU>:-Wno-deprecated-declarations>
+    $<$<CXX_COMPILER_ID:Intel>:-diag-disable=1786>)
+target_include_directories(test_main PUBLIC
+    thirdparty/doctest
+    thirdparty/fifo_map
+    ${PROJECT_BINARY_DIR}/include)
+target_link_libraries(test_main PUBLIC ${NLOHMANN_JSON_TARGET_NAME})
+
+#############################################################################
+# define test- and standard-specific build settings
+#############################################################################
+
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
+    AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.0
+    AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0 AND NOT MINGW)
+    # fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90050
+    json_test_set_test_options(all CXX_STANDARDS 17 LINK_LIBRARIES stdc++fs)
+endif()
+
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    # avoid stack overflow, see https://github.com/nlohmann/json/issues/2955
+    json_test_set_test_options("test-cbor;test-msgpack;test-ubjson;test-bjdata;test-binary_formats" LINK_OPTIONS /STACK:4000000)
+endif()
+
+# disable exceptions for test-disabled_exceptions
+json_test_set_test_options(test-disabled_exceptions
+    COMPILE_DEFINITIONS
+        JSON_NOEXCEPTION
+        # disabled due to https://github.com/nlohmann/json/discussions/2824
+        #$<$<CXX_COMPILER_ID:MSVC>:_HAS_EXCEPTIONS=0>
+    COMPILE_OPTIONS
+        $<$<CXX_COMPILER_ID:AppleClang>:-fno-exceptions> $<$<CXX_COMPILER_ID:Clang>:-fno-exceptions>
+        $<$<CXX_COMPILER_ID:GNU>:-fno-exceptions>
+        $<$<CXX_COMPILER_ID:Intel>:-fno-exceptions> $<$<CXX_COMPILER_ID:IntelLLVM>:-fno-exceptions>
+        # disabled due to https://github.com/nlohmann/json/discussions/2824
+        #$<$<CXX_COMPILER_ID:MSVC>:/EH>
+)
+
+# raise timeout of expensive Unicode test
+json_test_set_test_options(test-unicode4 TEST_PROPERTIES TIMEOUT 3000)
+
+#############################################################################
+# add unit tests
+#############################################################################
+
+if("${JSON_TestStandards}" STREQUAL "")
+    set(test_cxx_standards 11 14 17 20 23)
+    unset(test_force)
+else()
+    set(test_cxx_standards ${JSON_TestStandards})
+    set(test_force FORCE)
+endif()
+
+# Print selected standards marking unavailable ones with brackets
+set(msg_standards "")
+foreach(cxx_standard ${test_cxx_standards})
+    if(compiler_supports_cpp_${cxx_standard})
+        list(APPEND msg_standards ${cxx_standard})
+    else()
+        list(APPEND msg_standards [${cxx_standard}])
+    endif()
+endforeach()
+string(JOIN " " msg_standards ${msg_standards})
+set(msg "Testing standards: ${msg_standards}")
+if(test_force)
+    string(APPEND msg " (forced)")
+endif()
+message(STATUS "${msg}")
+
+# *DO* use json_test_set_test_options() above this line
+
+json_test_should_build_32bit_test(json_32bit_test json_32bit_test_only "${JSON_32bitTest}")
+file(GLOB files src/unit-*.cpp)
+if(json_32bit_test_only)
+    set(files src/unit-32bit.cpp)    
+elseif(NOT json_32bit_test)
+    list(FILTER files EXCLUDE REGEX src/unit-32bit.cpp)
+endif()
+
+foreach(file ${files})
+    json_test_add_test_for(${file} MAIN test_main CXX_STANDARDS ${test_cxx_standards} ${test_force})
+endforeach()
+
+if(json_32bit_test_only)
+    # Skip all other tests in this file
+    return()
+endif()
+
+# test legacy comparison of discarded values
+json_test_set_test_options(test-comparison_legacy
+    COMPILE_DEFINITIONS JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1
+)
+json_test_add_test_for(src/unit-comparison.cpp
+    NAME test-comparison_legacy
+    MAIN test_main CXX_STANDARDS ${test_cxx_standards} ${test_force}
+)
+
+# *DO NOT* use json_test_set_test_options() below this line
+
+#############################################################################
+# test ABI compatibility
+#############################################################################
+
+add_subdirectory(abi)
+
+#############################################################################
+# Test the generated build configs
+#############################################################################
+
+# these tests depend on the generated file nlohmann_jsonConfig.cmake
+if (JSON_Install)
+    add_subdirectory(cmake_import)
+    add_subdirectory(cmake_import_minver)
+endif()
+
+add_subdirectory(cmake_add_subdirectory)
+add_subdirectory(cmake_fetch_content)
+add_subdirectory(cmake_fetch_content2)
+add_subdirectory(cmake_target_include_directories)

source/lib/json/tests/abi/CMakeLists.txt

@@ -0,0 +1,30 @@
+# common build settings
+add_library(abi_compat_common INTERFACE)
+target_compile_definitions(abi_compat_common INTERFACE
+    DOCTEST_CONFIG_SUPER_FAST_ASSERTS
+    JSON_TEST_KEEP_MACROS)
+target_compile_features(abi_compat_common INTERFACE cxx_std_11)
+target_compile_options(abi_compat_common INTERFACE
+    $<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>
+    # MSVC: Force to always compile with W4
+    $<$<CXX_COMPILER_ID:MSVC>:/W4>
+
+    # https://github.com/nlohmann/json/pull/3229
+    $<$<CXX_COMPILER_ID:Intel>:-diag-disable=2196>
+
+    $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-deprecated;-Wno-float-equal>
+    $<$<CXX_COMPILER_ID:GNU>:-Wno-deprecated-declarations>
+    $<$<CXX_COMPILER_ID:Intel>:-diag-disable=1786>)
+target_include_directories(abi_compat_common SYSTEM INTERFACE
+    ../thirdparty/doctest
+    include)
+target_link_libraries(abi_compat_common INTERFACE ${NLOHMANN_JSON_TARGET_NAME})
+
+# shared main()
+add_library(abi_compat_main STATIC main.cpp)
+target_link_libraries(abi_compat_main PUBLIC abi_compat_common)
+
+# add individual tests
+add_subdirectory(config)
+add_subdirectory(diag)
+add_subdirectory(inline_ns)

source/lib/json/tests/abi/config/CMakeLists.txt

@@ -0,0 +1,22 @@
+# test the different options to change the namespace
+
+# test default namespace
+add_executable(abi_config_default default.cpp)
+target_link_libraries(abi_config_default PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_default
+    COMMAND abi_config_default ${DOCTEST_TEST_FILTER})
+
+# test no version namespace
+add_executable(abi_config_noversion noversion.cpp)
+target_link_libraries(abi_config_noversion PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_noversion
+    COMMAND abi_config_noversion ${DOCTEST_TEST_FILTER})
+
+# test custom namespace
+add_executable(abi_config_custom custom.cpp)
+target_link_libraries(abi_config_custom PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_custom
+    COMMAND abi_config_custom ${DOCTEST_TEST_FILTER})

source/lib/json/tests/abi/config/config.hpp

@@ -0,0 +1,35 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include "doctest.h"
+
+#include <iostream>
+#include <regex>
+#include <string>
+
+#define STRINGIZE_EX(x) #x
+#define STRINGIZE(x) STRINGIZE_EX(x)
+
+template<typename T>
+std::string namespace_name(std::string ns, T* /*unused*/ = nullptr) // NOLINT(performance-unnecessary-value-param)
+{
+#if DOCTEST_MSVC && !DOCTEST_CLANG
+    ns = __FUNCSIG__;
+#elif !DOCTEST_CLANG
+    ns = __PRETTY_FUNCTION__;
+#endif
+    std::smatch m;
+
+    // extract the true namespace name from the function signature
+    CAPTURE(ns);
+    CHECK(std::regex_search(ns, m, std::regex("nlohmann(::[a-zA-Z0-9_]+)*::basic_json")));
+
+    return m.str();
+}

source/lib/json/tests/abi/config/custom.cpp

@@ -0,0 +1,33 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+// define custom namespace
+#define NLOHMANN_JSON_NAMESPACE nlohmann // this line may be omitted
+#define NLOHMANN_JSON_NAMESPACE_BEGIN namespace nlohmann {
+#define NLOHMANN_JSON_NAMESPACE_END }
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("custom namespace")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::basic_json";
+
+        // fallback for Clang
+        const std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

source/lib/json/tests/abi/config/default.cpp

@@ -0,0 +1,41 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("default namespace")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::json_abi";
+
+#if JSON_DIAGNOSTICS
+        expected += "_diag";
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        expected += "_ldvcmp";
+#endif
+
+        expected += "_v" STRINGIZE(NLOHMANN_JSON_VERSION_MAJOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_MINOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_PATCH) "::basic_json";
+
+        // fallback for Clang
+        const std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

source/lib/json/tests/abi/config/noversion.cpp

@@ -0,0 +1,40 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 1
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("default namespace without version component")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::json_abi";
+
+#if JSON_DIAGNOSTICS
+        expected += "_diag";
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        expected += "_ldvcmp";
+#endif
+
+        expected += "::basic_json";
+
+        // fallback for Clang
+        const std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

source/lib/json/tests/abi/diag/CMakeLists.txt

@@ -0,0 +1,19 @@
+# test linking library built with different JSON_DIAGNOSTICS setting
+# into the same executable
+
+# compile code using JSON_DIAGNOSTICS=1
+add_library(abi_compat_diag_on STATIC diag_on.cpp)
+target_link_libraries(abi_compat_diag_on PUBLIC abi_compat_common)
+
+# compile code using JSON_DIAGNOSTICS=0
+add_library(abi_compat_diag_off STATIC diag_off.cpp)
+target_link_libraries(abi_compat_diag_off PUBLIC abi_compat_common)
+
+# build test executable and add test
+add_executable(abi_compat_diag diag.cpp)
+target_link_libraries(abi_compat_diag PRIVATE
+    abi_compat_main abi_compat_diag_on abi_compat_diag_off)
+
+add_test(
+    NAME test-abi_compat_diag
+    COMMAND abi_compat_diag ${DOCTEST_TEST_FILTER})

source/lib/json/tests/abi/diag/diag.cpp

@@ -0,0 +1,29 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include "diag.hpp"
+
+TEST_CASE("ABI compatible diagnostics")
+{
+    SECTION("basic_json size")
+    {
+        // basic_json with diagnostics is larger because of added data members
+        CHECK(json_sizeof_diag_on() == json_sizeof_diag_on_explicit());
+        CHECK(json_sizeof_diag_off() == json_sizeof_diag_off_explicit());
+        CHECK(json_sizeof_diag_on() > json_sizeof_diag_off());
+    }
+
+    SECTION("basic_json at")
+    {
+        // accessing a nonexistent key throws different exception with diagnostics
+        CHECK_THROWS_WITH(json_at_diag_on(), "[json.exception.out_of_range.403] (/foo) key 'bar' not found");
+        CHECK_THROWS_WITH(json_at_diag_off(), "[json.exception.out_of_range.403] key 'bar' not found");
+    }
+}

source/lib/json/tests/abi/diag/diag.hpp

@@ -0,0 +1,20 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <cstddef>
+
+std::size_t json_sizeof_diag_on();
+std::size_t json_sizeof_diag_on_explicit();
+
+std::size_t json_sizeof_diag_off();
+std::size_t json_sizeof_diag_off_explicit();
+
+void json_at_diag_on();
+void json_at_diag_off();

source/lib/json/tests/abi/diag/diag_off.cpp

@@ -0,0 +1,30 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#undef JSON_DIAGNOSTICS
+#define JSON_DIAGNOSTICS 0
+#include <nlohmann/json.hpp>
+
+#include "diag.hpp"
+
+std::size_t json_sizeof_diag_off()
+{
+    return sizeof(nlohmann::json);
+}
+
+std::size_t json_sizeof_diag_off_explicit()
+{
+    return sizeof(::NLOHMANN_JSON_NAMESPACE::json);
+}
+
+void json_at_diag_off()
+{
+    using nlohmann::json;
+    json j = json{{"foo", json::object()}};
+    j.at(json::json_pointer("/foo/bar"));
+}

source/lib/json/tests/abi/diag/diag_on.cpp

@@ -0,0 +1,30 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#undef JSON_DIAGNOSTICS
+#define JSON_DIAGNOSTICS 1
+#include <nlohmann/json.hpp>
+
+#include "diag.hpp"
+
+std::size_t json_sizeof_diag_on()
+{
+    return sizeof(nlohmann::json);
+}
+
+std::size_t json_sizeof_diag_on_explicit()
+{
+    return sizeof(::NLOHMANN_JSON_NAMESPACE::json);
+}
+
+void json_at_diag_on()
+{
+    using nlohmann::json;
+    json j = json{{"foo", json::object()}};
+    j.at(json::json_pointer("/foo/bar"));
+}

source/lib/json/tests/abi/inline_ns/CMakeLists.txt

@@ -0,0 +1,12 @@
+# test linking an old library version without an inline namespace
+# with the current library using an inline namespace into the same executable
+
+# build test executable and add test
+add_executable(abi_compat_inline_ns
+    use_v3_10_5.cpp
+    use_current.cpp)
+target_link_libraries(abi_compat_inline_ns PRIVATE abi_compat_main)
+
+add_test(
+    NAME test-abi_compat_inline_ns
+    COMMAND abi_compat_inline_ns ${DOCTEST_TEST_FILTER})

source/lib/json/tests/abi/inline_ns/use_current.cpp

@@ -0,0 +1,36 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+
+TEST_CASE("use current library with inline namespace")
+{
+    SECTION("implicitly")
+    {
+        using nlohmann::json;
+        using nlohmann::ordered_json;
+
+        json j;
+        // In v3.10.5 mixing json_pointers of different basic_json types
+        // results in implicit string conversion
+        j[ordered_json::json_pointer("/root")] = json::object();
+        CHECK(j.dump() == "{\"root\":{}}");
+    }
+
+    SECTION("explicitly")
+    {
+        using NLOHMANN_JSON_NAMESPACE::json;
+        using NLOHMANN_JSON_NAMESPACE::ordered_json;
+
+        json j;
+        j[ordered_json::json_pointer("/root")] = json::object();
+        CHECK(j.dump() == "{\"root\":{}}");
+    }
+}

source/lib/json/tests/abi/inline_ns/use_v3_10_5.cpp

@@ -0,0 +1,22 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json_v3_10_5.hpp>
+using nlohmann::json;
+using nlohmann::ordered_json;
+
+TEST_CASE("use library v3.10.5 without inline namespace")
+{
+    json j;
+    j[ordered_json::json_pointer("/root")] = json::object();
+    // In v3.10.5 mixing json_pointers of different basic_json types
+    // results in implicit string conversion
+    CHECK(j.dump() == "{\"/root\":{}}");
+}

source/lib/json/tests/abi/main.cpp

@@ -0,0 +1,11 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest_compatibility.h"

source/lib/json/tests/benchmarks/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.11...3.14)
+project(JSON_Benchmarks LANGUAGES CXX)
+
+# set compiler flags
+if((CMAKE_CXX_COMPILER_ID MATCHES GNU) OR (CMAKE_CXX_COMPILER_ID MATCHES Clang))
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto -DNDEBUG -O3")
+endif()
+
+# configure Google Benchmarks
+include(FetchContent)
+FetchContent_Declare(
+    benchmark
+    GIT_REPOSITORY https://github.com/google/benchmark.git
+    GIT_TAG origin/main
+    GIT_SHALLOW TRUE
+)
+
+FetchContent_GetProperties(benchmark)
+if(NOT benchmark_POPULATED)
+    FetchContent_Populate(benchmark)
+    set(BENCHMARK_ENABLE_TESTING OFF CACHE INTERNAL "" FORCE)
+    add_subdirectory(${benchmark_SOURCE_DIR} ${benchmark_BINARY_DIR})
+endif()
+
+# download test data
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../cmake ${CMAKE_MODULE_PATH})
+include(download_test_data)
+
+# benchmark binary
+add_executable(json_benchmarks src/benchmarks.cpp)
+target_compile_features(json_benchmarks PRIVATE cxx_std_11)
+target_link_libraries(json_benchmarks benchmark ${CMAKE_THREAD_LIBS_INIT})
+add_dependencies(json_benchmarks download_test_data)
+target_include_directories(json_benchmarks PRIVATE ${CMAKE_SOURCE_DIR}/../../single_include ${CMAKE_BINARY_DIR}/include)

source/lib/json/tests/benchmarks/src/benchmarks.cpp

@@ -0,0 +1,177 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <benchmark/benchmark.h>
+#include <nlohmann/json.hpp>
+#include <fstream>
+#include <numeric>
+#include <vector>
+#include <test_data.hpp>
+
+using json = nlohmann::json;
+
+//////////////////////////////////////////////////////////////////////////////
+// parse JSON from file
+//////////////////////////////////////////////////////////////////////////////
+
+static void ParseFile(benchmark::State& state, const char* filename)
+{
+    while (state.KeepRunning())
+    {
+        state.PauseTiming();
+        auto* f = new std::ifstream(filename);
+        auto* j = new json();
+        state.ResumeTiming();
+
+        *j = json::parse(*f);
+
+        state.PauseTiming();
+        delete f;
+        delete j;
+        state.ResumeTiming();
+    }
+
+    std::ifstream file(filename, std::ios::binary | std::ios::ate);
+    state.SetBytesProcessed(state.iterations() * file.tellg());
+}
+BENCHMARK_CAPTURE(ParseFile, jeopardy,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
+BENCHMARK_CAPTURE(ParseFile, canada,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
+BENCHMARK_CAPTURE(ParseFile, citm_catalog,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
+BENCHMARK_CAPTURE(ParseFile, twitter,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
+BENCHMARK_CAPTURE(ParseFile, floats,            TEST_DATA_DIRECTORY "/regression/floats.json");
+BENCHMARK_CAPTURE(ParseFile, signed_ints,       TEST_DATA_DIRECTORY "/regression/signed_ints.json");
+BENCHMARK_CAPTURE(ParseFile, unsigned_ints,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
+BENCHMARK_CAPTURE(ParseFile, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
+
+//////////////////////////////////////////////////////////////////////////////
+// parse JSON from string
+//////////////////////////////////////////////////////////////////////////////
+
+static void ParseString(benchmark::State& state, const char* filename)
+{
+    std::ifstream f(filename);
+    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
+
+    while (state.KeepRunning())
+    {
+        state.PauseTiming();
+        auto* j = new json();
+        state.ResumeTiming();
+
+        *j = json::parse(str);
+
+        state.PauseTiming();
+        delete j;
+        state.ResumeTiming();
+    }
+
+    state.SetBytesProcessed(state.iterations() * str.size());
+}
+BENCHMARK_CAPTURE(ParseString, jeopardy,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
+BENCHMARK_CAPTURE(ParseString, canada,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
+BENCHMARK_CAPTURE(ParseString, citm_catalog,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
+BENCHMARK_CAPTURE(ParseString, twitter,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
+BENCHMARK_CAPTURE(ParseString, floats,            TEST_DATA_DIRECTORY "/regression/floats.json");
+BENCHMARK_CAPTURE(ParseString, signed_ints,       TEST_DATA_DIRECTORY "/regression/signed_ints.json");
+BENCHMARK_CAPTURE(ParseString, unsigned_ints,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
+BENCHMARK_CAPTURE(ParseString, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
+
+//////////////////////////////////////////////////////////////////////////////
+// serialize JSON
+//////////////////////////////////////////////////////////////////////////////
+
+static void Dump(benchmark::State& state, const char* filename, int indent)
+{
+    std::ifstream f(filename);
+    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
+    json j = json::parse(str);
+
+    while (state.KeepRunning())
+    {
+        j.dump(indent);
+    }
+
+    state.SetBytesProcessed(state.iterations() * j.dump(indent).size());
+}
+BENCHMARK_CAPTURE(Dump, jeopardy / -,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json",                 -1);
+BENCHMARK_CAPTURE(Dump, jeopardy / 4,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json",                 4);
+BENCHMARK_CAPTURE(Dump, canada / -,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json",       -1);
+BENCHMARK_CAPTURE(Dump, canada / 4,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json",       4);
+BENCHMARK_CAPTURE(Dump, citm_catalog / -,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", -1);
+BENCHMARK_CAPTURE(Dump, citm_catalog / 4,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", 4);
+BENCHMARK_CAPTURE(Dump, twitter / -,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json",      -1);
+BENCHMARK_CAPTURE(Dump, twitter / 4,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json",      4);
+BENCHMARK_CAPTURE(Dump, floats / -,            TEST_DATA_DIRECTORY "/regression/floats.json",                 -1);
+BENCHMARK_CAPTURE(Dump, floats / 4,            TEST_DATA_DIRECTORY "/regression/floats.json",                 4);
+BENCHMARK_CAPTURE(Dump, signed_ints / -,       TEST_DATA_DIRECTORY "/regression/signed_ints.json",            -1);
+BENCHMARK_CAPTURE(Dump, signed_ints / 4,       TEST_DATA_DIRECTORY "/regression/signed_ints.json",            4);
+BENCHMARK_CAPTURE(Dump, unsigned_ints / -,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json",          -1);
+BENCHMARK_CAPTURE(Dump, unsigned_ints / 4,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json",          4);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / -, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json",      -1);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / 4, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json",      4);
+
+//////////////////////////////////////////////////////////////////////////////
+// serialize CBOR
+//////////////////////////////////////////////////////////////////////////////
+static void ToCbor(benchmark::State& state, const char* filename)
+{
+    std::ifstream f(filename);
+    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
+    json j = json::parse(str);
+
+    while (state.KeepRunning())
+    {
+        json::to_cbor(j);
+    }
+
+    state.SetBytesProcessed(state.iterations() * json::to_cbor(j).size());
+}
+BENCHMARK_CAPTURE(ToCbor, jeopardy,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
+BENCHMARK_CAPTURE(ToCbor, canada,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
+BENCHMARK_CAPTURE(ToCbor, citm_catalog,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
+BENCHMARK_CAPTURE(ToCbor, twitter,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
+BENCHMARK_CAPTURE(ToCbor, floats,            TEST_DATA_DIRECTORY "/regression/floats.json");
+BENCHMARK_CAPTURE(ToCbor, signed_ints,       TEST_DATA_DIRECTORY "/regression/signed_ints.json");
+BENCHMARK_CAPTURE(ToCbor, unsigned_ints,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
+BENCHMARK_CAPTURE(ToCbor, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
+
+//////////////////////////////////////////////////////////////////////////////
+// serialize binary CBOR
+//////////////////////////////////////////////////////////////////////////////
+static void BinaryToCbor(benchmark::State& state)
+{
+    std::vector<uint8_t> data(256);
+    std::iota(data.begin(), data.end(), 0);
+
+    auto it = data.begin();
+    std::vector<uint8_t> in;
+    in.reserve(state.range(0));
+    for (int i = 0; i < state.range(0); ++i)
+    {
+        if (it == data.end())
+        {
+            it = data.begin();
+        }
+
+        in.push_back(*it);
+        ++it;
+    }
+
+    json::binary_t bin{in};
+    json j{{"type", "binary"}, {"data", bin}};
+
+    while (state.KeepRunning())
+    {
+        json::to_cbor(j);
+    }
+
+    state.SetBytesProcessed(state.iterations() * json::to_cbor(j).size());
+}
+BENCHMARK(BinaryToCbor)->RangeMultiplier(2)->Range(8, 8 << 12);
+
+BENCHMARK_MAIN();

source/lib/json/tests/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
+)

source/lib/json/tests/cmake_add_subdirectory/project/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.1...3.14)
+
+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()

source/lib/json/tests/cmake_add_subdirectory/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/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()

source/lib/json/tests/cmake_fetch_content/project/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.11...3.14)
+
+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)

source/lib/json/tests/cmake_fetch_content/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/cmake_fetch_content2/CMakeLists.txt

@@ -0,0 +1,20 @@
+if (${CMAKE_VERSION} VERSION_GREATER "3.14.0")
+  add_test(NAME cmake_fetch_content2_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_content2_build
+    COMMAND ${CMAKE_COMMAND} --build .
+  )
+  set_tests_properties(cmake_fetch_content2_configure PROPERTIES
+    FIXTURES_SETUP cmake_fetch_content2
+    LABELS "git_required;not_reproducible"
+  )
+  set_tests_properties(cmake_fetch_content2_build PROPERTIES
+    FIXTURES_REQUIRED cmake_fetch_content2
+    LABELS "git_required;not_reproducible"
+  )
+endif()

source/lib/json/tests/cmake_fetch_content2/project/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.14)
+
+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_MakeAvailable(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)

source/lib/json/tests/cmake_fetch_content2/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/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
+)

source/lib/json/tests/cmake_import/project/CMakeLists.txt

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.1...3.14)
+
+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)
+

source/lib/json/tests/cmake_import/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/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
+)

source/lib/json/tests/cmake_import_minver/project/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.1...3.14)
+
+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)

source/lib/json/tests/cmake_import_minver/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/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
+)

source/lib/json/tests/cmake_target_include_directories/project/Bar.cpp

@@ -0,0 +1,11 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "Bar.hpp"
+
+class Bar;

source/lib/json/tests/cmake_target_include_directories/project/Bar.hpp

@@ -0,0 +1,12 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+#include "Foo.hpp"
+
+class Bar : public Foo {};

source/lib/json/tests/cmake_target_include_directories/project/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.1...3.14)
+
+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)

source/lib/json/tests/cmake_target_include_directories/project/Foo.cpp

@@ -0,0 +1,11 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "Foo.hpp"
+
+class Foo;

source/lib/json/tests/cmake_target_include_directories/project/Foo.hpp

@@ -0,0 +1,12 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+#include <nlohmann/json.hpp>
+
+class Foo {};

source/lib/json/tests/cmake_target_include_directories/project/main.cpp

@@ -0,0 +1,16 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main(int argc, char** argv)
+{
+    nlohmann::json j;
+
+    return 0;
+}

source/lib/json/tests/cuda_example/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.18)
+project(json_cuda LANGUAGES CUDA)
+
+add_executable(json_cuda json_cuda.cu)
+target_include_directories(json_cuda PRIVATE ../../include)
+target_compile_features(json_cuda PUBLIC cuda_std_11)
+set_target_properties(json_cuda PROPERTIES
+    CUDA_EXTENSIONS OFF
+    CUDA_STANDARD_REQUIRED ON
+)

source/lib/json/tests/cuda_example/json_cuda.cu

@@ -0,0 +1,19 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include <nlohmann/json.hpp>
+
+int main()
+{
+    nlohmann::ordered_json json = {"Test"};
+    json.dump();
+
+    // regression for #3013 (ordered_json::reset() compile error with nvcc)
+    nlohmann::ordered_json metadata;
+    metadata.erase("key");
+}

source/lib/json/tests/fuzzing.md

@@ -0,0 +1,81 @@
+# Fuzz testing
+
+Each parser of the library (JSON, BJData, BSON, CBOR, MessagePack, and UBJSON) can be fuzz tested. Currently,
+[libFuzzer](https://llvm.org/docs/LibFuzzer.html) and [afl++](https://github.com/AFLplusplus/AFLplusplus) are supported.
+
+## Corpus creation
+
+For most effective fuzzing, a [corpus](https://llvm.org/docs/LibFuzzer.html#corpus) should be provided. A corpus is a
+directory with some simple input files that cover several features of the parser and is hence a good starting point
+for mutations.
+
+```shell
+TEST_DATA_VERSION=3.1.0
+wget https://github.com/nlohmann/json_test_data/archive/refs/tags/v$TEST_DATA_VERSION.zip
+unzip v$TEST_DATA_VERSION.zip
+rm v$TEST_DATA_VERSION.zip
+for FORMAT in json bjdata bson cbor msgpack ubjson
+do
+  rm -fr corpus_$FORMAT
+  mkdir corpus_$FORMAT
+  find json_test_data-$TEST_DATA_VERSION -size -5k -name "*.$FORMAT" -exec cp "{}" "corpus_$FORMAT" \;
+done
+rm -fr json_test_data-$TEST_DATA_VERSION
+```
+
+The generated corpus can be used with both libFuzzer and afl++. The remainder of this documentation assumes the corpus
+directories have been created in the `tests` directory.
+
+## libFuzzer
+
+To use libFuzzer, you need to pass `-fsanitize=fuzzer` as `FUZZER_ENGINE`. In the `tests` directory, call
+
+```shell
+make fuzzers FUZZER_ENGINE="-fsanitize=fuzzer"
+```
+
+This creates a fuzz tester binary for each parser that supports these
+[command line options](https://llvm.org/docs/LibFuzzer.html#options).
+
+In case your default compiler is not a Clang compiler that includes libFuzzer (Clang 6.0 or later), you need to set the
+`CXX` variable accordingly. Note the compiler provided by Xcode (AppleClang) does not contain libFuzzer. Please install
+Clang via Homebrew calling `brew install llvm` and add `CXX=$(brew --prefix llvm)/bin/clang` to the `make` call:
+
+```shell
+make fuzzers FUZZER_ENGINE="-fsanitize=fuzzer" CXX=$(brew --prefix llvm)/bin/clang
+```
+
+Then pass the corpus directory as command-line argument (assuming it is located in `tests`):
+
+```shell
+./parse_cbor_fuzzer corpus_cbor
+```
+
+The fuzzer should be able to run indefinitely without crashing. In case of a crash, the tested input is dumped into
+a file starting with `crash-`.
+
+## afl++
+
+To use afl++, you need to pass `-fsanitize=fuzzer` as `FUZZER_ENGINE`. It will be replaced by a `libAFLDriver.a` to
+re-use the same code written for libFuzzer with afl++. Furthermore, set `afl-clang-fast++` as compiler.
+
+```shell
+CXX=afl-clang-fast++ make fuzzers FUZZER_ENGINE="-fsanitize=fuzzer" 
+```
+
+Then the fuzzer is called like this in the `tests` directory:
+
+```shell
+afl-fuzz -i corpus_cbor -o out  -- ./parse_cbor_fuzzer 
+```
+
+The fuzzer should be able to run indefinitely without crashing. In case of a crash, the tested input is written to the
+directory `out`.
+
+## OSS-Fuzz
+
+The library is further fuzz-tested 24/7 by Google's [OSS-Fuzz project](https://github.com/google/oss-fuzz). It uses
+the same `fuzzers` target as above and also relies on the `FUZZER_ENGINE` variable. See the used
+[build script](https://github.com/google/oss-fuzz/blob/master/projects/json/build.sh) for more information.
+
+In case the build at OSS-Fuzz fails, an issue will be created automatically.

source/lib/json/tests/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>
+

source/lib/json/tests/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/

source/lib/json/tests/reports/2016-09-09-nativejson_benchmark/conformance_Nlohmann (C++11).md

@@ -0,0 +1,670 @@
+
+
+
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+Fixed #43">Update sample result for 41 libraries</a>
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+  <div id="readme" class="readme blob instapaper_body">
+    <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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source/lib/json/tests/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>
+

source/lib/json/tests/src/fuzzer-driver_afl.cpp

@@ -0,0 +1,39 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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 = 0;
+        while (std::cin.get(c))
+        {
+            vec.push_back(static_cast<uint8_t>(c));
+        }
+
+        LLVMFuzzerTestOneInput(vec.data(), vec.size());
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    }
+#endif
+}

source/lib/json/tests/src/fuzzer-parse_bjdata.cpp

@@ -0,0 +1,85 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+This file implements a parser test suitable for fuzz testing. Given a byte
+array data, it performs the following steps:
+
+- j1 = from_bjdata(data)
+- vec = to_bjdata(j1)
+- j2 = from_bjdata(vec)
+- assert(j1 == j2)
+- vec2 = to_bjdata(j1, use_size = true, use_type = false)
+- j3 = from_bjdata(vec2)
+- assert(j1 == j3)
+- vec3 = to_bjdata(j1, use_size = true, use_type = true)
+- j4 = from_bjdata(vec3)
+- assert(j1 == j4)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+*/
+
+#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> const vec1(data, data + size);
+        json const j1 = json::from_bjdata(vec1);
+
+        try
+        {
+            // step 2.1: round trip without adding size annotations to container types
+            std::vector<uint8_t> const vec2 = json::to_bjdata(j1, false, false);
+
+            // step 2.2: round trip with adding size annotations but without adding type annotations to container types
+            std::vector<uint8_t> const vec3 = json::to_bjdata(j1, true, false);
+
+            // step 2.3: round trip with adding size as well as type annotations to container types
+            std::vector<uint8_t> const vec4 = json::to_bjdata(j1, true, true);
+
+            // parse serialization
+            json const j2 = json::from_bjdata(vec2);
+            json const j3 = json::from_bjdata(vec3);
+            json const j4 = json::from_bjdata(vec4);
+
+            // serializations must match
+            assert(json::to_bjdata(j2, false, false) == vec2);
+            assert(json::to_bjdata(j3, true, false) == vec3);
+            assert(json::to_bjdata(j4, true, true) == vec4);
+        }
+        catch (const json::parse_error&)
+        {
+            // parsing a BJData 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;
+}

source/lib/json/tests/src/fuzzer-parse_bson.cpp

@@ -0,0 +1,74 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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> const vec1(data, data + size);
+        json const j1 = json::from_bson(vec1);
+
+        if (j1.is_discarded())
+        {
+            return 0;
+        }
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> const vec2 = json::to_bson(j1);
+
+            // parse serialization
+            json const 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;
+}

source/lib/json/tests/src/fuzzer-parse_cbor.cpp

@@ -0,0 +1,69 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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> const vec1(data, data + size);
+        json const j1 = json::from_cbor(vec1);
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> const vec2 = json::to_cbor(j1);
+
+            // parse serialization
+            json const 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;
+}

source/lib/json/tests/src/fuzzer-parse_json.cpp

@@ -0,0 +1,70 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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 const j1 = json::parse(data, data + size);
+
+        try
+        {
+            // step 2: round trip
+
+            // first serialization
+            std::string const s1 = j1.dump();
+
+            // parse serialization
+            json const j2 = json::parse(s1);
+
+            // second serialization
+            std::string const 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;
+}

source/lib/json/tests/src/fuzzer-parse_msgpack.cpp

@@ -0,0 +1,69 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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> const vec1(data, data + size);
+        json const j1 = json::from_msgpack(vec1);
+
+        try
+        {
+            // step 2: round trip
+            std::vector<uint8_t> const vec2 = json::to_msgpack(j1);
+
+            // parse serialization
+            json const 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;
+}

source/lib/json/tests/src/fuzzer-parse_ubjson.cpp

@@ -0,0 +1,85 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+/*
+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.
+*/
+
+#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> const vec1(data, data + size);
+        json const j1 = json::from_ubjson(vec1);
+
+        try
+        {
+            // step 2.1: round trip without adding size annotations to container types
+            std::vector<uint8_t> const vec2 = json::to_ubjson(j1, false, false);
+
+            // step 2.2: round trip with adding size annotations but without adding type annotations to container types
+            std::vector<uint8_t> const 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> const vec4 = json::to_ubjson(j1, true, true);
+
+            // parse serialization
+            json const j2 = json::from_ubjson(vec2);
+            json const j3 = json::from_ubjson(vec3);
+            json const 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;
+}

source/lib/json/tests/src/make_test_data_available.hpp

@@ -0,0 +1,30 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <cstdio>   // fopen, fclose, FILE
+#include <memory> // unique_ptr
+#include <test_data.hpp>
+#include <doctest.h>
+
+namespace utils
+{
+
+inline bool check_testsuite_downloaded()
+{
+    const std::unique_ptr<std::FILE, decltype(&std::fclose)> file(std::fopen(TEST_DATA_DIRECTORY "/README.md", "r"), &std::fclose);
+    return file != nullptr;
+}
+
+TEST_CASE("check test suite is downloaded")
+{
+    REQUIRE_MESSAGE(utils::check_testsuite_downloaded(), "Test data not found in '" TEST_DATA_DIRECTORY "'. Please execute target 'download_test_data' before running this test suite. See <https://github.com/nlohmann/json#execute-unit-tests> for more information.");
+}
+
+}  // namespace utils

source/lib/json/tests/src/test_utils.hpp

@@ -0,0 +1,33 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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

source/lib/json/tests/src/unit-32bit.cpp

@@ -0,0 +1,134 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <climits> // SIZE_MAX
+#include <limits> // numeric_limits
+
+template <typename OfType, typename T, bool MinInRange, bool MaxInRange>
+struct trait_test_arg
+{
+    using of_type = OfType;
+    using type = T;
+    static constexpr bool min_in_range = MinInRange;
+    static constexpr bool max_in_range = MaxInRange;
+};
+
+TEST_CASE_TEMPLATE_DEFINE("value_in_range_of trait", T, value_in_range_of_test)
+{
+    using nlohmann::detail::value_in_range_of;
+
+    using of_type = typename T::of_type;
+    using type = typename T::type;
+    constexpr bool min_in_range = T::min_in_range;
+    constexpr bool max_in_range = T::max_in_range;
+
+    type const val_min = std::numeric_limits<type>::min();
+    type const val_min2 = val_min + 1;
+    type const val_max = std::numeric_limits<type>::max();
+    type const val_max2 = val_max - 1;
+
+    REQUIRE(CHAR_BIT == 8);
+
+    std::string of_type_str;
+    if (std::is_unsigned<of_type>::value)
+    {
+        of_type_str += "u";
+    }
+    of_type_str += "int";
+    of_type_str += std::to_string(sizeof(of_type) * 8);
+
+    INFO("of_type := ", of_type_str);
+
+    std::string type_str;
+    if (std::is_unsigned<type>::value)
+    {
+        type_str += "u";
+    }
+    type_str += "int";
+    type_str += std::to_string(sizeof(type) * 8);
+
+    INFO("type := ", type_str);
+
+    CAPTURE(val_min);
+    CAPTURE(min_in_range);
+    CAPTURE(val_max);
+    CAPTURE(max_in_range);
+
+    if (min_in_range)
+    {
+        CHECK(value_in_range_of<of_type>(val_min));
+        CHECK(value_in_range_of<of_type>(val_min2));
+    }
+    else
+    {
+        CHECK_FALSE(value_in_range_of<of_type>(val_min));
+        CHECK_FALSE(value_in_range_of<of_type>(val_min2));
+    }
+
+    if (max_in_range)
+    {
+        CHECK(value_in_range_of<of_type>(val_max));
+        CHECK(value_in_range_of<of_type>(val_max2));
+    }
+    else
+    {
+        CHECK_FALSE(value_in_range_of<of_type>(val_max));
+        CHECK_FALSE(value_in_range_of<of_type>(val_max2));
+    }
+}
+
+TEST_CASE("32bit")
+{
+    REQUIRE(SIZE_MAX == 0xffffffff);
+}
+
+TEST_CASE_TEMPLATE_INVOKE(value_in_range_of_test, \
+                          trait_test_arg<std::size_t, std::int32_t, false, true>, \
+                          trait_test_arg<std::size_t, std::uint32_t, true, true>, \
+                          trait_test_arg<std::size_t, std::int64_t, false, false>, \
+                          trait_test_arg<std::size_t, std::uint64_t, true, false>);
+
+TEST_CASE("BJData")
+{
+    SECTION("parse errors")
+    {
+        SECTION("array")
+        {
+            SECTION("optimized array: negative size")
+            {
+                std::vector<uint8_t> const vM = {'[', '$', 'M', '#', '[', 'I', 0x00, 0x20, 'M', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0xFF, ']'};
+                std::vector<uint8_t> const vMX = {'[', '$', 'U', '#', '[', 'M', 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 'U', 0x01, ']'};
+
+                json _;
+                CHECK_THROWS_WITH_AS(_ = json::from_bjdata(vM), "[json.exception.out_of_range.408] syntax error while parsing BJData size: integer value overflow", json::out_of_range&);
+                CHECK(json::from_bjdata(vM, true, false).is_discarded());
+
+                CHECK_THROWS_WITH_AS(_ = json::from_bjdata(vMX), "[json.exception.out_of_range.408] syntax error while parsing BJData size: integer value overflow", json::out_of_range&);
+                CHECK(json::from_bjdata(vMX, true, false).is_discarded());
+            }
+
+            SECTION("optimized array: integer value overflow")
+            {
+                std::vector<uint8_t> const vL = {'[', '#', 'L', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F};
+                std::vector<uint8_t> const vM = {'[', '$', 'M', '#', '[', 'I', 0x00, 0x20, 'M', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0xFF, ']'};
+
+                json _;
+                CHECK_THROWS_WITH_AS(_ = json::from_bjdata(vL), "[json.exception.out_of_range.408] syntax error while parsing BJData size: integer value overflow", json::out_of_range&);
+                CHECK(json::from_bjdata(vL, true, false).is_discarded());
+
+                CHECK_THROWS_WITH_AS(_ = json::from_bjdata(vM), "[json.exception.out_of_range.408] syntax error while parsing BJData size: integer value overflow", json::out_of_range&);
+                CHECK(json::from_bjdata(vM, true, false).is_discarded());
+            }
+        }
+    }
+}

source/lib/json/tests/src/unit-algorithms.cpp

@@ -0,0 +1,365 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <algorithm>
+#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.empty();
+            }));
+            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.empty();
+            }));
+            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_WITH_AS(std::sort(j.begin(), j.end()), "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
+            }
+        }
+
+        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"}));
+    }
+
+    SECTION("iota")
+    {
+        SECTION("int")
+        {
+            json json_arr = {0, 5, 2, 4, 10, 20, 30, 40, 50, 1};
+            std::iota(json_arr.begin(), json_arr.end(), 0);
+            CHECK(json_arr == json({0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
+        }
+        SECTION("double")
+        {
+            json json_arr = {0.5, 1.5, 1.3, 4.1, 10.2, 20.5, 30.6, 40.1, 50.22, 1.5};
+            std::iota(json_arr.begin(), json_arr.end(), 0.5);
+            CHECK(json_arr == json({0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5}));
+        }
+
+        SECTION("char")
+        {
+            json json_arr = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', '0', '1'};
+            std::iota(json_arr.begin(), json_arr.end(), '0');
+            CHECK(json_arr == json({'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}));
+        }
+    }
+
+    SECTION("copy")
+    {
+        SECTION("copy without if")
+        {
+            json dest_arr;
+            const json source_arr = {1, 2, 3, 4};
+
+            std::copy(source_arr.begin(), source_arr.end(), std::back_inserter(dest_arr));
+
+            CHECK(dest_arr == source_arr);
+        }
+        SECTION("copy if")
+        {
+            json dest_arr;
+            const json source_arr = {0, 3, 6, 9, 12, 15, 20};
+
+            std::copy_if(source_arr.begin(), source_arr.end(), std::back_inserter(dest_arr), [](const json & _value)
+            {
+                return _value.get<int>() % 3 == 0;
+            });
+            CHECK(dest_arr == json({0, 3, 6, 9, 12, 15}));
+        }
+        SECTION("copy n")
+        {
+            const json source_arr = {0, 1, 2, 3, 4, 5, 6, 7};
+            json dest_arr;
+            const unsigned char numToCopy = 2;
+
+            std::copy_n(source_arr.begin(), numToCopy, std::back_inserter(dest_arr));
+            CHECK(dest_arr == json{0, 1});
+
+        }
+        SECTION("copy n chars")
+        {
+            const json source_arr = {'1', '2', '3', '4', '5', '6', '7'};
+            json dest_arr;
+            const unsigned char numToCopy = 4;
+
+            std::copy_n(source_arr.begin(), numToCopy, std::back_inserter(dest_arr));
+            CHECK(dest_arr == json{'1', '2', '3', '4'});
+        }
+    }
+
+}

source/lib/json/tests/src/unit-allocator.cpp

@@ -0,0 +1,263 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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>
+{
+    using std::allocator<T>::allocator;
+
+    bad_allocator() = default;
+    template<class U> bad_allocator(const bad_allocator<U>& /*unused*/) { }
+
+    template<class... Args>
+    void construct(T* /*unused*/, Args&& ... /*unused*/) // NOLINT(cppcoreguidelines-missing-std-forward)
+    {
+        throw std::bad_alloc();
+    }
+
+    template <class U>
+    struct rebind
+    {
+        using other = bad_allocator<U>;
+    };
+};
+} // namespace
+
+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();
+        }
+
+        ::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();
+        }
+
+        std::allocator<T>::deallocate(p, n);
+    }
+
+    void destroy(T* p)
+    {
+        if (next_destroy_fails)
+        {
+            next_destroy_fails = false;
+            throw std::bad_alloc();
+        }
+
+        static_cast<void>(p); // fix MSVC's C4100 warning
+        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);
+}
+} // namespace
+
+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;
+            const 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;
+            const 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;
+            const 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;
+            const 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() = default;
+    template <class U>
+    allocator_no_forward(allocator_no_forward<U> /*unused*/) {}
+
+    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...);
+    }
+};
+} // namespace
+
+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");
+    }
+}

source/lib/json/tests/src/unit-alt-string.cpp

@@ -0,0 +1,322 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-FileCopyrightText: 2018 Vitaliy Manushkin <agri@akamo.info>
+// SPDX-License-Identifier: MIT
+
+#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) noexcept;
+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;
+
+    static constexpr auto npos = static_cast<std::size_t>(-1);
+
+    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 noexcept
+    {
+        return str_impl < op;
+    }
+
+    bool operator<(const alt_string& op) const noexcept
+    {
+        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() const
+    {
+        return str_impl.data();
+    }
+
+    bool empty() const
+    {
+        return str_impl.empty();
+    }
+
+    std::size_t find(const alt_string& str, std::size_t pos = 0) const
+    {
+        return str_impl.find(str.str_impl, pos);
+    }
+
+    std::size_t find_first_of(char c, std::size_t pos = 0) const
+    {
+        return str_impl.find_first_of(c, pos);
+    }
+
+    alt_string substr(std::size_t pos = 0, std::size_t count = npos) const
+    {
+        const std::string s = str_impl.substr(pos, count);
+        return {s.data(), s.size()};
+    }
+
+    alt_string& replace(std::size_t pos, std::size_t count, const alt_string& str)
+    {
+        str_impl.replace(pos, count, str.str_impl);
+        return *this;
+    }
+
+  private:
+    std::string str_impl {};
+
+    friend bool operator<(const char* /*op1*/, const alt_string& /*op2*/) noexcept;
+};
+
+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) noexcept
+{
+    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(R"({"foo": "bar"})");
+        alt_string dump = doc.dump();
+        CHECK(dump == R"({"foo":"bar"})");
+    }
+
+    SECTION("items")
+    {
+        auto doc = alt_json::parse(R"({"foo": "bar"})");
+
+        for (const auto& item : doc.items())
+        {
+            CHECK(item.key() == "foo");
+            CHECK(item.value() == "bar");
+        }
+
+        auto doc_array = alt_json::parse(R"(["foo", "bar"])");
+
+        for (const 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");
+        }
+    }
+
+    SECTION("JSON pointer")
+    {
+        // conversion from json to alt_json fails to compile (see #3425);
+        // attempted fix(*) produces: [[['b','a','r'],['b','a','z']]] (with each char being an integer)
+        // (*) disable implicit conversion for json_refs of any basic_json type
+        // alt_json j = R"(
+        // {
+        //     "foo": ["bar", "baz"]
+        // }
+        // )"_json;
+        auto j = alt_json::parse(R"({"foo": ["bar", "baz"]})");
+
+        CHECK(j.at(alt_json::json_pointer("/foo/0")) == j["foo"][0]);
+        CHECK(j.at(alt_json::json_pointer("/foo/1")) == j["foo"][1]);
+    }
+}

source/lib/json/tests/src/unit-assert_macro.cpp

@@ -0,0 +1,48 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+// avoid warning when assert does not abort
+DOCTEST_GCC_SUPPRESS_WARNING_PUSH
+DOCTEST_GCC_SUPPRESS_WARNING("-Wstrict-overflow")
+DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wstrict-overflow")
+
+/// 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);
+
+        const 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
+
+DOCTEST_GCC_SUPPRESS_WARNING_POP
+DOCTEST_CLANG_SUPPRESS_WARNING_POP

source/lib/json/tests/src/unit-binary_formats.cpp

@@ -0,0 +1,211 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <fstream>
+#include "make_test_data_available.hpp"
+
+TEST_CASE("Binary Formats" * doctest::skip())
+{
+    SECTION("canada.json")
+    {
+        const auto* filename = TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json";
+        const json j = json::parse(std::ifstream(filename));
+
+        const auto json_size = j.dump().size();
+        const auto bjdata_1_size = json::to_bjdata(j).size();
+        const auto bjdata_2_size = json::to_bjdata(j, true).size();
+        const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
+        const auto bson_size = json::to_bson(j).size();
+        const auto cbor_size = json::to_cbor(j).size();
+        const auto msgpack_size = json::to_msgpack(j).size();
+        const auto ubjson_1_size = json::to_ubjson(j).size();
+        const auto ubjson_2_size = json::to_ubjson(j, true).size();
+        const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
+
+        CHECK(json_size == 2090303);
+        CHECK(bjdata_1_size == 1112030);
+        CHECK(bjdata_2_size == 1224148);
+        CHECK(bjdata_3_size == 1224148);
+        CHECK(bson_size == 1794522);
+        CHECK(cbor_size == 1055552);
+        CHECK(msgpack_size == 1056145);
+        CHECK(ubjson_1_size == 1112030);
+        CHECK(ubjson_2_size == 1224148);
+        CHECK(ubjson_3_size == 1169069);
+
+        CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
+        CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(53.199));
+        CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(58.563));
+        CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(58.563));
+        CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(85.849));
+        CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(50.497));
+        CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(50.526));
+        CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(53.199));
+        CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(58.563));
+        CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(55.928));
+    }
+
+    SECTION("twitter.json")
+    {
+        const auto* filename = TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json";
+        const json j = json::parse(std::ifstream(filename));
+
+        const auto json_size = j.dump().size();
+        const auto bjdata_1_size = json::to_bjdata(j).size();
+        const auto bjdata_2_size = json::to_bjdata(j, true).size();
+        const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
+        const auto bson_size = json::to_bson(j).size();
+        const auto cbor_size = json::to_cbor(j).size();
+        const auto msgpack_size = json::to_msgpack(j).size();
+        const auto ubjson_1_size = json::to_ubjson(j).size();
+        const auto ubjson_2_size = json::to_ubjson(j, true).size();
+        const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
+
+        CHECK(json_size == 466906);
+        CHECK(bjdata_1_size == 425342);
+        CHECK(bjdata_2_size == 429970);
+        CHECK(bjdata_3_size == 429970);
+        CHECK(bson_size == 444568);
+        CHECK(cbor_size == 402814);
+        CHECK(msgpack_size == 401510);
+        CHECK(ubjson_1_size == 426160);
+        CHECK(ubjson_2_size == 430788);
+        CHECK(ubjson_3_size == 430798);
+
+        CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
+        CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(91.097));
+        CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(92.089));
+        CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(92.089));
+        CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(95.215));
+        CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(86.273));
+        CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(85.993));
+        CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(91.273));
+        CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(92.264));
+        CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(92.266));
+    }
+
+    SECTION("citm_catalog.json")
+    {
+        const auto* filename = TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json";
+        const json j = json::parse(std::ifstream(filename));
+
+        const auto json_size = j.dump().size();
+        const auto bjdata_1_size = json::to_bjdata(j).size();
+        const auto bjdata_2_size = json::to_bjdata(j, true).size();
+        const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
+        const auto bson_size = json::to_bson(j).size();
+        const auto cbor_size = json::to_cbor(j).size();
+        const auto msgpack_size = json::to_msgpack(j).size();
+        const auto ubjson_1_size = json::to_ubjson(j).size();
+        const auto ubjson_2_size = json::to_ubjson(j, true).size();
+        const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
+
+        CHECK(json_size == 500299);
+        CHECK(bjdata_1_size == 390781);
+        CHECK(bjdata_2_size == 433557);
+        CHECK(bjdata_3_size == 432964);
+        CHECK(bson_size == 479430);
+        CHECK(cbor_size == 342373);
+        CHECK(msgpack_size == 342473);
+        CHECK(ubjson_1_size == 391463);
+        CHECK(ubjson_2_size == 434239);
+        CHECK(ubjson_3_size == 425073);
+
+        CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
+        CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(78.109));
+        CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(86.659));
+        CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(86.541));
+        CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(95.828));
+        CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(68.433));
+        CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(68.453));
+        CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(78.245));
+        CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(86.795));
+        CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(84.963));
+    }
+
+    SECTION("jeopardy.json")
+    {
+        const auto* filename = TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json";
+        json j = json::parse(std::ifstream(filename));
+
+        const auto json_size = j.dump().size();
+        const auto bjdata_1_size = json::to_bjdata(j).size();
+        const auto bjdata_2_size = json::to_bjdata(j, true).size();
+        const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
+        const auto bson_size = json::to_bson({{"", j}}).size(); // wrap array in object for BSON
+        const auto cbor_size = json::to_cbor(j).size();
+        const auto msgpack_size = json::to_msgpack(j).size();
+        const auto ubjson_1_size = json::to_ubjson(j).size();
+        const auto ubjson_2_size = json::to_ubjson(j, true).size();
+        const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
+
+        CHECK(json_size == 52508728);
+        CHECK(bjdata_1_size == 50710965);
+        CHECK(bjdata_2_size == 51144830);
+        CHECK(bjdata_3_size == 51144830);
+        CHECK(bson_size == 56008520);
+        CHECK(cbor_size == 46187320);
+        CHECK(msgpack_size == 46158575);
+        CHECK(ubjson_1_size == 50710965);
+        CHECK(ubjson_2_size == 51144830);
+        CHECK(ubjson_3_size == 49861422);
+
+        CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
+        CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(96.576));
+        CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(97.402));
+        CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(97.402));
+        CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(106.665));
+        CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(87.961));
+        CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(87.906));
+        CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(96.576));
+        CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(97.402));
+        CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(94.958));
+    }
+
+    SECTION("sample.json")
+    {
+        const auto* filename = TEST_DATA_DIRECTORY "/json_testsuite/sample.json";
+        const json j = json::parse(std::ifstream(filename));
+
+        const auto json_size = j.dump().size();
+        const auto bjdata_1_size = json::to_bjdata(j).size();
+        const auto bjdata_2_size = json::to_bjdata(j, true).size();
+        const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
+        // BSON cannot process the file as it contains code point  U+0000
+        const auto cbor_size = json::to_cbor(j).size();
+        const auto msgpack_size = json::to_msgpack(j).size();
+        const auto ubjson_1_size = json::to_ubjson(j).size();
+        const auto ubjson_2_size = json::to_ubjson(j, true).size();
+        const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
+
+        CHECK(json_size == 168677);
+        CHECK(bjdata_1_size == 148695);
+        CHECK(bjdata_2_size == 150569);
+        CHECK(bjdata_3_size == 150569);
+        CHECK(cbor_size == 147095);
+        CHECK(msgpack_size == 147017);
+        CHECK(ubjson_1_size == 148695);
+        CHECK(ubjson_2_size == 150569);
+        CHECK(ubjson_3_size == 150883);
+
+        CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
+        CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(88.153));
+        CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(89.264));
+        CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(89.264));
+        CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(87.205));
+        CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(87.158));
+        CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(88.153));
+        CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(89.264));
+        CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(89.450));
+    }
+}

source/lib/json/tests/src/unit-byte_container_with_subtype.cpp

@@ -0,0 +1,77 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("byte_container_with_subtype")
+{
+    using subtype_type = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>::subtype_type;
+
+    SECTION("empty container")
+    {
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container;
+
+        CHECK(!container.has_subtype());
+        CHECK(container.subtype() == static_cast<subtype_type>(-1));
+
+        container.clear_subtype();
+        CHECK(!container.has_subtype());
+        CHECK(container.subtype() == static_cast<subtype_type>(-1));
+
+        container.set_subtype(42);
+        CHECK(container.has_subtype());
+        CHECK(container.subtype() == 42);
+    }
+
+    SECTION("subtyped container")
+    {
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container({}, 42);
+        CHECK(container.has_subtype());
+        CHECK(container.subtype() == 42);
+
+        container.clear_subtype();
+        CHECK(!container.has_subtype());
+        CHECK(container.subtype() == static_cast<subtype_type>(-1));
+    }
+
+    SECTION("comparisons")
+    {
+        std::vector<std::uint8_t> const bytes = {{0xCA, 0xFE, 0xBA, 0xBE}};
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container1;
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container2({}, 42);
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container3(bytes);
+        nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>> container4(bytes, 42);
+
+        CHECK(container1 == container1);
+        CHECK(container1 != container2);
+        CHECK(container1 != container3);
+        CHECK(container1 != container4);
+        CHECK(container2 != container1);
+        CHECK(container2 == container2);
+        CHECK(container2 != container3);
+        CHECK(container2 != container4);
+        CHECK(container3 != container1);
+        CHECK(container3 != container2);
+        CHECK(container3 == container3);
+        CHECK(container3 != container4);
+        CHECK(container4 != container1);
+        CHECK(container4 != container2);
+        CHECK(container4 != container3);
+        CHECK(container4 == container4);
+
+        container3.clear();
+        container4.clear();
+
+        CHECK(container1 == container3);
+        CHECK(container2 == container4);
+    }
+}

source/lib/json/tests/src/unit-capacity.cpp

@@ -0,0 +1,543 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("capacity")
+{
+    SECTION("empty()")
+    {
+        SECTION("boolean")
+        {
+            json j = true; // NOLINT(misc-const-correctness)
+            const json j_const = true;
+
+            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"; // NOLINT(misc-const-correctness)
+            const json j_const = "hello world";
+
+            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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::array();
+
+                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}; // NOLINT(misc-const-correctness)
+                const json j_const = {1, 2, 3};
+
+                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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::object();
+
+                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}}; // NOLINT(misc-const-correctness)
+                const json j_const = {{"one", 1}, {"two", 2}, {"three", 3}};
+
+                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; // NOLINT(misc-const-correctness)
+            const json j_const = -23;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = 23u;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = 23.42;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = nullptr;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = true;
+
+            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"; // NOLINT(misc-const-correctness)
+            const json j_const = "hello world";
+
+            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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::array();
+
+                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}; // NOLINT(misc-const-correctness)
+                const json j_const = {1, 2, 3};
+
+                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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::object();
+
+                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}}; // NOLINT(misc-const-correctness)
+                const json j_const = {{"one", 1}, {"two", 2}, {"three", 3}};
+
+                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; // NOLINT(misc-const-correctness)
+            const json j_const = -23;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = 23u;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = 23.42;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = nullptr;
+
+            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; // NOLINT(misc-const-correctness)
+            const json j_const = true;
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("string")
+        {
+            json j = "hello world"; // NOLINT(misc-const-correctness)
+            const json j_const = "hello world";
+
+            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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::array();
+
+                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}; // NOLINT(misc-const-correctness)
+                const json j_const = {1, 2, 3};
+
+                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(); // NOLINT(misc-const-correctness)
+                const json j_const = json::object();
+
+                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}}; // NOLINT(misc-const-correctness)
+                const json j_const = {{"one", 1}, {"two", 2}, {"three", 3}};
+
+                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; // NOLINT(misc-const-correctness)
+            const json j_const = -23;
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j = 23u; // NOLINT(misc-const-correctness)
+            const json j_const = 23u;
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("number (float)")
+        {
+            json j = 23.42; // NOLINT(misc-const-correctness)
+            const json j_const = 23.42;
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 1);
+                CHECK(j_const.max_size() == 1);
+            }
+        }
+
+        SECTION("null")
+        {
+            json j = nullptr; // NOLINT(misc-const-correctness)
+            const json j_const = nullptr;
+
+            SECTION("result of max_size")
+            {
+                CHECK(j.max_size() == 0);
+                CHECK(j_const.max_size() == 0);
+            }
+        }
+    }
+}

source/lib/json/tests/src/unit-class_const_iterator.cpp

@@ -0,0 +1,393 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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 const j(json::value_t::null);
+                json::const_iterator const it(&j);
+            }
+
+            SECTION("object")
+            {
+                json const j(json::value_t::object);
+                json::const_iterator const it(&j);
+            }
+
+            SECTION("array")
+            {
+                json const j(json::value_t::array);
+                json::const_iterator const it(&j);
+            }
+        }
+
+        SECTION("copy assignment")
+        {
+            json const j(json::value_t::null);
+            json::const_iterator const 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 const cit(it);
+            }
+
+            SECTION("create from initialized iterator")
+            {
+                json j;
+                const json::iterator it = j.begin();
+                json::const_iterator const cit(it);
+            }
+        }
+    }
+
+    SECTION("initialization")
+    {
+        SECTION("set_begin")
+        {
+            SECTION("null")
+            {
+                json const j(json::value_t::null);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+
+            SECTION("object")
+            {
+                json const j(json::value_t::object);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+
+            SECTION("array")
+            {
+                json const j(json::value_t::array);
+                json::const_iterator it(&j);
+                it.set_begin();
+                CHECK((it == j.cbegin()));
+            }
+        }
+
+        SECTION("set_end")
+        {
+            SECTION("null")
+            {
+                json const j(json::value_t::null);
+                json::const_iterator it(&j);
+                it.set_end();
+                CHECK((it == j.cend()));
+            }
+
+            SECTION("object")
+            {
+                json const j(json::value_t::object);
+                json::const_iterator it(&j);
+                it.set_end();
+                CHECK((it == j.cend()));
+            }
+
+            SECTION("array")
+            {
+                json const 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 const j(json::value_t::null);
+                json::const_iterator const it = j.cbegin();
+                CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("number")
+            {
+                json const j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK(*it == json(17));
+                it = j.cend();
+                CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("object")
+            {
+                json const j({{"foo", "bar"}});
+                json::const_iterator const it = j.cbegin();
+                CHECK(*it == json("bar"));
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator const it = j.cbegin();
+                CHECK(*it == json(1));
+            }
+        }
+
+        SECTION("operator->")
+        {
+            SECTION("null")
+            {
+                json const j(json::value_t::null);
+                json::const_iterator const it = j.cbegin();
+                CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("number")
+            {
+                json const j(17);
+                json::const_iterator it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "number");
+                it = j.cend();
+                CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("object")
+            {
+                json const j({{"foo", "bar"}});
+                json::const_iterator const it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "string");
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator const it = j.cbegin();
+                CHECK(std::string(it->type_name()) == "number");
+            }
+        }
+    }
+
+    SECTION("increment/decrement")
+    {
+        SECTION("post-increment")
+        {
+            SECTION("null")
+            {
+                json const 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 const 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 const j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
+                it++;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-increment")
+        {
+            SECTION("null")
+            {
+                json const 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 const 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 const j({{"foo", "bar"}});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
+                ++it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator it = j.cbegin();
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
+            }
+        }
+
+        SECTION("post-decrement")
+        {
+            SECTION("null")
+            {
+                json const j(json::value_t::null);
+                json::const_iterator const it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json const 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 const j({{"foo", "bar"}});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
+                it--;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-decrement")
+        {
+            SECTION("null")
+            {
+                json const j(json::value_t::null);
+                json::const_iterator const it = j.cend();
+                CHECK((it.m_it.primitive_iterator.m_it == 1));
+            }
+
+            SECTION("number")
+            {
+                json const 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 const j({{"foo", "bar"}});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
+                --it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
+            }
+
+            SECTION("array")
+            {
+                json const j({1, 2, 3, 4});
+                json::const_iterator it = j.cend();
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+            }
+        }
+    }
+}

source/lib/json/tests/src/unit-class_iterator.cpp

@@ -0,0 +1,468 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+template<typename Iter>
+using can_post_increment_temporary = decltype((std::declval<Iter>()++)++);
+
+template<typename Iter>
+using can_post_decrement_temporary = decltype((std::declval<Iter>()--)--);
+
+TEST_CASE("iterator class")
+{
+    SECTION("construction")
+    {
+        SECTION("constructor")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator const it(&j);
+            }
+
+            SECTION("object")
+            {
+                json j(json::value_t::object);
+                json::iterator const it(&j);
+            }
+
+            SECTION("array")
+            {
+                json j(json::value_t::array);
+                json::iterator const it(&j);
+            }
+        }
+
+        SECTION("copy assignment")
+        {
+            json j(json::value_t::null);
+            json::iterator const 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 const it = j.begin();
+                CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK(*it == json(17));
+                it = j.end();
+                CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator const it = j.begin();
+                CHECK(*it == json("bar"));
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator const it = j.begin();
+                CHECK(*it == json(1));
+            }
+        }
+
+        SECTION("operator->")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator const it = j.begin();
+                CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("number")
+            {
+                json j(17);
+                json::iterator it = j.begin();
+                CHECK(std::string(it->type_name()) == "number");
+                it = j.end();
+                CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+            }
+
+            SECTION("object")
+            {
+                json j({{"foo", "bar"}});
+                json::iterator const it = j.begin();
+                CHECK(std::string(it->type_name()) == "string");
+            }
+
+            SECTION("array")
+            {
+                json j({1, 2, 3, 4});
+                json::iterator const 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_data.m_value.object->begin()));
+                it++;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.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_data.m_value.array->begin()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it++;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.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_data.m_value.object->begin()));
+                ++it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.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_data.m_value.array->begin()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                ++it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
+            }
+        }
+
+        SECTION("post-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator const 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_data.m_value.object->end()));
+                it--;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.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_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                it--;
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+            }
+        }
+
+        SECTION("pre-decrement")
+        {
+            SECTION("null")
+            {
+                json j(json::value_t::null);
+                json::iterator const 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_data.m_value.object->end()));
+                --it;
+                CHECK((it.m_it.object_iterator == it.m_object->m_data.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_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+                --it;
+                CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
+                CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
+            }
+        }
+    }
+    SECTION("equality-preserving")
+    {
+        SECTION("post-increment")
+        {
+            SECTION("primitive_iterator_t")
+            {
+                using Iter = nlohmann::detail::primitive_iterator_t;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
+            }
+            SECTION("iter_impl")
+            {
+                using Iter = nlohmann::detail::iter_impl<json>;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
+            }
+            SECTION("json_reverse_iterator")
+            {
+                using Base = nlohmann::detail::iter_impl<json>;
+                using Iter = nlohmann::detail::json_reverse_iterator<Base>;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
+            }
+        }
+        SECTION("post-decrement")
+        {
+            SECTION("primitive_iterator_t")
+            {
+                using Iter = nlohmann::detail::primitive_iterator_t;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value);
+            }
+            SECTION("iter_impl")
+            {
+                using Iter = nlohmann::detail::iter_impl<json>;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
+            }
+            SECTION("json_reverse_iterator")
+            {
+                using Base = nlohmann::detail::iter_impl<json>;
+                using Iter = nlohmann::detail::json_reverse_iterator<Base>;
+                CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
+            }
+        }
+    }
+    // prevent "accidental mutation of a temporary object"
+    SECTION("cert-dcl21-cpp")
+    {
+        using nlohmann::detail::is_detected;
+        SECTION("post-increment")
+        {
+            SECTION("primitive_iterator_t")
+            {
+                using Iter = nlohmann::detail::primitive_iterator_t;
+                CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
+            }
+            SECTION("iter_impl")
+            {
+                using Iter = nlohmann::detail::iter_impl<json>;
+                CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
+            }
+            SECTION("json_reverse_iterator")
+            {
+                using Base = nlohmann::detail::iter_impl<json>;
+                using Iter = nlohmann::detail::json_reverse_iterator<Base>;
+                CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
+            }
+        }
+        SECTION("post-decrement")
+        {
+            SECTION("primitive_iterator_t")
+            {
+                using Iter = nlohmann::detail::primitive_iterator_t;
+                CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
+            }
+            SECTION("iter_impl")
+            {
+                using Iter = nlohmann::detail::iter_impl<json>;
+                CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
+            }
+            SECTION("json_reverse_iterator")
+            {
+                using Base = nlohmann::detail::iter_impl<json>;
+                using Iter = nlohmann::detail::json_reverse_iterator<Base>;
+                CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
+            }
+
+        }
+    }
+}

source/lib/json/tests/src/unit-class_lexer.cpp

@@ -0,0 +1,226 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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, 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(); // NOLINT(hicpp-move-const-arg,performance-move-const-arg)
+}
+} // namespace
+
+std::string get_error_message(const char* s, 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); // NOLINT(hicpp-move-const-arg,performance-move-const-arg)
+    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));
+    }
+}

source/lib/json/tests/src/unit-comparison.cpp

@@ -0,0 +1,595 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+// cmake/test.cmake selects the C++ standard versions with which to build a
+// unit test based on the presence of JSON_HAS_CPP_<VERSION> macros.
+// When using macros that are only defined for particular versions of the standard
+// (e.g., JSON_HAS_FILESYSTEM for C++17 and up), please mention the corresponding
+// version macro in a comment close by, like this:
+// JSON_HAS_CPP_<VERSION> (do not remove; see note at top of file)
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#if JSON_HAS_THREE_WAY_COMPARISON
+// this can be replaced with the doctest stl extension header in version 2.5
+namespace doctest
+{
+template<> struct StringMaker<std::partial_ordering>
+{
+    static String convert(const std::partial_ordering& order)
+    {
+        if (order == std::partial_ordering::less)
+        {
+            return "std::partial_ordering::less";
+        }
+        if (order == std::partial_ordering::equivalent)
+        {
+            return "std::partial_ordering::equivalent";
+        }
+        if (order == std::partial_ordering::greater)
+        {
+            return "std::partial_ordering::greater";
+        }
+        if (order == std::partial_ordering::unordered)
+        {
+            return "std::partial_ordering::unordered";
+        }
+        return "{?}";
+    }
+};
+} // namespace doctest
+#endif
+
+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);
+}
+} // namespace
+
+TEST_CASE("lexicographical comparison operators")
+{
+    constexpr auto f_ = false;
+    constexpr auto _t = true;
+    constexpr auto nan = std::numeric_limits<json::number_float_t>::quiet_NaN();
+#if JSON_HAS_THREE_WAY_COMPARISON
+    constexpr auto lt = std::partial_ordering::less;
+    constexpr auto gt = std::partial_ordering::greater;
+    constexpr auto eq = std::partial_ordering::equivalent;
+    constexpr auto un = std::partial_ordering::unordered;
+#endif
+
+#if JSON_HAS_THREE_WAY_COMPARISON
+    INFO("using 3-way comparison");
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+    INFO("using legacy comparison");
+#endif
+
+    //REQUIRE(std::numeric_limits<json::number_float_t>::has_quiet_NaN);
+    REQUIRE(std::isnan(nan));
+
+    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,
+            json::value_t::discarded
+        };
+
+        std::vector<std::vector<bool>> expected_lt =
+        {
+            //0   1   2   3   4   5   6   7   8   9
+            {f_, _t, _t, _t, _t, _t, _t, _t, _t, f_}, //  0
+            {f_, f_, _t, _t, _t, _t, _t, _t, _t, f_}, //  1
+            {f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, //  2
+            {f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, //  3
+            {f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, //  4
+            {f_, f_, f_, f_, f_, f_, _t, _t, _t, f_}, //  5
+            {f_, f_, f_, f_, f_, f_, f_, _t, _t, f_}, //  6
+            {f_, f_, f_, f_, f_, f_, f_, f_, _t, f_}, //  7
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  8
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  9
+        };
+
+        SECTION("comparison: less")
+        {
+            REQUIRE(expected_lt.size() == j_types.size());
+            for (size_t i = 0; i < j_types.size(); ++i)
+            {
+                REQUIRE(expected_lt[i].size() == j_types.size());
+                for (size_t j = 0; j < j_types.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    // check precomputed values
+#if JSON_HAS_THREE_WAY_COMPARISON
+                    // JSON_HAS_CPP_20 (do not remove; see note at top of file)
+                    CHECK((j_types[i] < j_types[j]) == expected_lt[i][j]);
+#else
+                    CHECK(operator<(j_types[i], j_types[j]) == expected_lt[i][j]);
+#endif
+                    CHECK(f(j_types[i], j_types[j]) == expected_lt[i][j]);
+                }
+            }
+        }
+#if JSON_HAS_THREE_WAY_COMPARISON
+        // JSON_HAS_CPP_20 (do not remove; see note at top of file)
+        SECTION("comparison: 3-way")
+        {
+            std::vector<std::vector<std::partial_ordering>> expected =
+            {
+                //0   1   2   3   4   5   6   7   8   9
+                {eq, lt, lt, lt, lt, lt, lt, lt, lt, un}, //  0
+                {gt, eq, lt, lt, lt, lt, lt, lt, lt, un}, //  1
+                {gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, //  2
+                {gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, //  3
+                {gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, //  4
+                {gt, gt, gt, gt, gt, eq, lt, lt, lt, un}, //  5
+                {gt, gt, gt, gt, gt, gt, eq, lt, lt, un}, //  6
+                {gt, gt, gt, gt, gt, gt, gt, eq, lt, un}, //  7
+                {gt, gt, gt, gt, gt, gt, gt, gt, eq, un}, //  8
+                {un, un, un, un, un, un, un, un, un, un}, //  9
+            };
+
+            // check expected partial_ordering against expected boolean
+            REQUIRE(expected.size() == expected_lt.size());
+            for (size_t i = 0; i < expected.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == expected_lt[i].size());
+                for (size_t j = 0; j < expected[i].size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK(std::is_lt(expected[i][j]) == expected_lt[i][j]);
+                }
+            }
+
+            // check 3-way comparison against expected partial_ordering
+            REQUIRE(expected.size() == j_types.size());
+            for (size_t i = 0; i < j_types.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == j_types.size());
+                for (size_t j = 0; j < j_types.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK((j_types[i] <=> j_types[j]) == expected[i][j]); // *NOPAD*
+                }
+            }
+        }
+#endif
+    }
+
+    SECTION("values")
+    {
+        json j_values =
+        {
+            nullptr, nullptr,                                              // 0 1
+            -17, 42,                                                       // 2 3
+            8u, 13u,                                                       // 4 5
+            3.14159, 23.42,                                                // 6 7
+            nan, nan,                                                      // 8 9
+            "foo", "bar",                                                  // 10 11
+            true, false,                                                   // 12 13
+            {1, 2, 3}, {"one", "two", "three"},                            // 14 15
+            {{"first", 1}, {"second", 2}}, {{"a", "A"}, {"b", {"B"}}},     // 16 17
+            json::binary({1, 2, 3}), json::binary({1, 2, 4}),              // 18 19
+            json(json::value_t::discarded), json(json::value_t::discarded) // 20 21
+        };
+
+        std::vector<std::vector<bool>> expected_eq =
+        {
+            //0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21
+            {_t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  0
+            {_t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  1
+            {f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  2
+            {f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  3
+            {f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  4
+            {f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  5
+            {f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  6
+            {f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  7
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  8
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  9
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 10
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 11
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 12
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_}, // 13
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_}, // 14
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_}, // 15
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_}, // 16
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_}, // 17
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_}, // 18
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_}, // 19
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
+        };
+
+        std::vector<std::vector<bool>> expected_lt =
+        {
+            //0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21
+            {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_}, //  0
+            {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_}, //  1
+            {f_, f_, f_, _t, _t, _t, _t, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  2
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  3
+            {f_, f_, f_, _t, f_, _t, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  4
+            {f_, f_, f_, _t, f_, f_, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  5
+            {f_, f_, f_, _t, _t, _t, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  6
+            {f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  7
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  8
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, //  9
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 10
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 11
+            {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 12
+            {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 13
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, _t, f_, f_, _t, _t, f_, f_}, // 14
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 15
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, f_, f_, _t, _t, f_, f_}, // 16
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, f_, _t, _t, f_, f_}, // 17
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_}, // 18
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 19
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
+            {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
+        };
+
+        SECTION("compares unordered")
+        {
+            std::vector<std::vector<bool>> expected =
+            {
+                //0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  0
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  1
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  2
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  3
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  4
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  5
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  6
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  7
+                {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  8
+                {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, //  9
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 10
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 11
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 12
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 13
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 14
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 15
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 16
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 17
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 18
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 19
+                {_t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t}, // 20
+                {_t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t}, // 21
+            };
+
+            // check if two values compare unordered as expected
+            REQUIRE(expected.size() == j_values.size());
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == j_values.size());
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK(json::compares_unordered(j_values[i], j_values[j]) == expected[i][j]);
+                }
+            }
+        }
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        SECTION("compares unordered (inverse)")
+        {
+            std::vector<std::vector<bool>> expected =
+            {
+                //0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  0
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  1
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  2
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  3
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  4
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  5
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  6
+                {f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  7
+                {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  8
+                {f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, //  9
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 10
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 11
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 12
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 13
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 14
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 15
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 16
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 17
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 18
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 19
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
+                {f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
+            };
+
+            // check that two values compare unordered as expected (with legacy-mode enabled)
+            REQUIRE(expected.size() == j_values.size());
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == j_values.size());
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CAPTURE(j_values[i])
+                    CAPTURE(j_values[j])
+                    CHECK(json::compares_unordered(j_values[i], j_values[j], true) == expected[i][j]);
+                }
+            }
+        }
+#endif
+
+        SECTION("comparison: equal")
+        {
+            // check that two values compare equal
+            REQUIRE(expected_eq.size() == j_values.size());
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                REQUIRE(expected_eq[i].size() == j_values.size());
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK((j_values[i] == j_values[j]) == expected_eq[i][j]);
+                }
+            }
+
+            // compare with null pointer
+            json j_null;
+            CHECK(j_null == nullptr);
+            CHECK(nullptr == j_null);
+        }
+
+        SECTION("comparison: not equal")
+        {
+            // check that two values compare unequal as expected
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+
+                    if (json::compares_unordered(j_values[i], j_values[j], true))
+                    {
+                        // if two values compare unordered,
+                        // check that the boolean comparison result is always false
+                        CHECK_FALSE(j_values[i] != j_values[j]);
+                    }
+                    else
+                    {
+                        // otherwise, check that they compare according to their definition
+                        // as the inverse of equal
+                        CHECK((j_values[i] != j_values[j]) == !(j_values[i] == j_values[j]));
+                    }
+                }
+            }
+
+            // compare with null pointer
+            const 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")
+        {
+            // check that two values compare less than as expected
+            REQUIRE(expected_lt.size() == j_values.size());
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                REQUIRE(expected_lt[i].size() == j_values.size());
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK((j_values[i] < j_values[j]) == expected_lt[i][j]);
+                }
+            }
+        }
+
+        SECTION("comparison: less than or equal equal")
+        {
+            // check that two values compare less than or equal as expected
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    if (json::compares_unordered(j_values[i], j_values[j], true))
+                    {
+                        // if two values compare unordered,
+                        // check that the boolean comparison result is always false
+                        CHECK_FALSE(j_values[i] <= j_values[j]);
+                    }
+                    else
+                    {
+                        // otherwise, check that they compare according to their definition
+                        // as the inverse of less than with the operand order reversed
+                        CHECK((j_values[i] <= j_values[j]) == !(j_values[j] < j_values[i]));
+                    }
+                }
+            }
+        }
+
+        SECTION("comparison: greater than")
+        {
+            // check that two values compare greater than as expected
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    if (json::compares_unordered(j_values[i], j_values[j]))
+                    {
+                        // if two values compare unordered,
+                        // check that the boolean comparison result is always false
+                        CHECK_FALSE(j_values[i] > j_values[j]);
+                    }
+                    else
+                    {
+                        // otherwise, check that they compare according to their definition
+                        // as the inverse of less than or equal which is defined as
+                        // the inverse of less than with the operand order reversed
+                        CHECK((j_values[i] > j_values[j]) == !(j_values[i] <= j_values[j]));
+                        CHECK((j_values[i] > j_values[j]) == !!(j_values[j] < j_values[i]));
+                    }
+                }
+            }
+        }
+
+        SECTION("comparison: greater than or equal")
+        {
+            // check that two values compare greater than or equal as expected
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    if (json::compares_unordered(j_values[i], j_values[j], true))
+                    {
+                        // if two values compare unordered,
+                        // check that the boolean result is always false
+                        CHECK_FALSE(j_values[i] >= j_values[j]);
+                    }
+                    else
+                    {
+                        // otherwise, check that they compare according to their definition
+                        // as the inverse of less than
+                        CHECK((j_values[i] >= j_values[j]) == !(j_values[i] < j_values[j]));
+                    }
+                }
+            }
+        }
+
+#if JSON_HAS_THREE_WAY_COMPARISON
+        // JSON_HAS_CPP_20 (do not remove; see note at top of file)
+        SECTION("comparison: 3-way")
+        {
+            std::vector<std::vector<std::partial_ordering>> expected =
+            {
+                //0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21
+                {eq, eq, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, un, un}, //  0
+                {eq, eq, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, un, un}, //  1
+                {gt, gt, eq, lt, lt, lt, lt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  2
+                {gt, gt, gt, eq, gt, gt, gt, gt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  3
+                {gt, gt, gt, lt, eq, lt, gt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  4
+                {gt, gt, gt, lt, gt, eq, gt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  5
+                {gt, gt, gt, lt, lt, lt, eq, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  6
+                {gt, gt, gt, lt, gt, gt, gt, eq, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  7
+                {gt, gt, un, un, un, un, un, un, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  8
+                {gt, gt, un, un, un, un, un, un, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, //  9
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, gt, gt, gt, gt, gt, gt, gt, lt, lt, un, un}, // 10
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, eq, gt, gt, gt, gt, gt, gt, lt, lt, un, un}, // 11
+                {gt, gt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, eq, gt, lt, lt, lt, lt, lt, lt, un, un}, // 12
+                {gt, gt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, eq, lt, lt, lt, lt, lt, lt, un, un}, // 13
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, eq, lt, gt, gt, lt, lt, un, un}, // 14
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, gt, eq, gt, gt, lt, lt, un, un}, // 15
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, lt, lt, eq, gt, lt, lt, un, un}, // 16
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, lt, lt, lt, eq, lt, lt, un, un}, // 17
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, lt, un, un}, // 18
+                {gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, un, un}, // 19
+                {un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un}, // 20
+                {un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un}, // 21
+            };
+
+            // check expected partial_ordering against expected booleans
+            REQUIRE(expected.size() == expected_eq.size());
+            REQUIRE(expected.size() == expected_lt.size());
+            for (size_t i = 0; i < expected.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == expected_eq[i].size());
+                REQUIRE(expected[i].size() == expected_lt[i].size());
+                for (size_t j = 0; j < expected[i].size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK(std::is_eq(expected[i][j]) == expected_eq[i][j]);
+                    CHECK(std::is_lt(expected[i][j]) == expected_lt[i][j]);
+                    if (std::is_gt(expected[i][j]))
+                    {
+                        CHECK((!expected_eq[i][j] && !expected_lt[i][j]));
+                    }
+                }
+            }
+
+            // check that two values compare according to their expected ordering
+            REQUIRE(expected.size() == j_values.size());
+            for (size_t i = 0; i < j_values.size(); ++i)
+            {
+                REQUIRE(expected[i].size() == j_values.size());
+                for (size_t j = 0; j < j_values.size(); ++j)
+                {
+                    CAPTURE(i)
+                    CAPTURE(j)
+                    CHECK((j_values[i] <=> j_values[j]) == expected[i][j]); // *NOPAD*
+                }
+            }
+        }
+#endif
+    }
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+    SECTION("parser callback regression")
+    {
+        SECTION("filter specific element")
+        {
+            const auto* s_object = R"(
+                {
+                    "foo": 2,
+                    "bar": {
+                        "baz": 1
+                    }
+                }
+            )";
+            const auto* s_array = R"(
+                [1,2,[3,4,5],4,5]
+            )";
+
+            json j_object = json::parse(s_object, [](int /*unused*/, json::parse_event_t /*unused*/, const json & j) noexcept
+            {
+                // filter all number(2) elements
+                return j != json(2);
+            });
+
+            CHECK (j_object == json({{"bar", {{"baz", 1}}}}));
+
+            json j_array = json::parse(s_array, [](int /*unused*/, json::parse_event_t /*unused*/, const json & j) noexcept
+            {
+                return j != json(2);
+            });
+
+            CHECK (j_array == json({1, {3, 4, 5}, 4, 5}));
+        }
+    }
+#endif
+}

source/lib/json/tests/src/unit-concepts.cpp

@@ -0,0 +1,150 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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()"
+        {
+            const 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());
+            }
+        }
+    }
+}

source/lib/json/tests/src/unit-constructor2.cpp

@@ -0,0 +1,186 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("array")
+        {
+            json j {"foo", 1, 42.23, false};
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("null")
+        {
+            json j(nullptr);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("boolean")
+        {
+            json j(true);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("string")
+        {
+            json j("Hello world");
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (integer)")
+        {
+            json j(42);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json j(42u);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json j(42.23);
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            CHECK(j == k);
+        }
+
+        SECTION("binary")
+        {
+            json j = json::binary({1, 2, 3});
+            json k(j); // NOLINT(performance-unnecessary-copy-initialization)
+            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);
+        const json k(std::move(j));
+        CHECK(k.type() == json::value_t::object);
+        CHECK(j.type() == json::value_t::null); // NOLINT: access after move is OK here
+    }
+
+    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}}; // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+
+        SECTION("array")
+        {
+            auto* j = new json {"foo", 1, 1u, false, 23.42}; // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+
+        SECTION("string")
+        {
+            auto* j = new json("Hello world"); // NOLINT(cppcoreguidelines-owning-memory)
+            delete j; // NOLINT(cppcoreguidelines-owning-memory)
+        }
+    }
+}

source/lib/json/tests/src/unit-convenience.cpp

@@ -0,0 +1,205 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#define JSON_TESTS_PRIVATE
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <sstream>
+
+namespace
+{
+struct alt_string_iter
+{
+    alt_string_iter() = default;
+    alt_string_iter(const char* cstr)
+        : impl(cstr)
+    {}
+
+    void reserve(std::size_t s)
+    {
+        impl.reserve(s);
+    }
+
+    template<typename Iter>
+    void append(Iter first, Iter last)
+    {
+        impl.append(first, last);
+    }
+
+    std::string::const_iterator begin() const noexcept
+    {
+        return impl.begin();
+    }
+
+    std::string::const_iterator end() const noexcept
+    {
+        return impl.end();
+    }
+
+    std::size_t size() const noexcept
+    {
+        return impl.size();
+    }
+
+    alt_string_iter& operator+=(const char c)
+    {
+        impl += c;
+        return *this;
+    }
+
+    std::string impl{};
+};
+
+struct alt_string_data
+{
+    alt_string_data() = default;
+    alt_string_data(const char* cstr)
+        : impl(cstr)
+    {}
+
+    void reserve(std::size_t s)
+    {
+        impl.reserve(s);
+    }
+
+    void append(const char* p, std::size_t s)
+    {
+        impl.append(p, s);
+    }
+
+    const char* data() const
+    {
+        return impl.data();
+    }
+
+    std::size_t size() const
+    {
+        return impl.size();
+    }
+
+    alt_string_data& operator+=(const char c)
+    {
+        impl += c;
+        return *this;
+    }
+
+    std::string impl{};
+};
+
+void check_escaped(const char* original, const char* escaped = "", 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);
+}
+} // namespace
+
+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_WITH_AS(check_escaped("ä\xA9ü"), "[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9", json::type_error&);
+
+        CHECK_THROWS_WITH_AS(check_escaped("\xC2"), "[json.exception.type_error.316] incomplete UTF-8 string; last byte: 0xC2", json::type_error&);
+    }
+
+    SECTION("string concat")
+    {
+        using nlohmann::detail::concat;
+
+        const char* expected = "Hello, world!";
+        alt_string_iter const hello_iter{"Hello, "};
+        alt_string_data const hello_data{"Hello, "};
+        std::string const world = "world";
+
+        SECTION("std::string")
+        {
+            std::string str1 = concat(hello_iter, world, '!');
+            std::string str2 = concat(hello_data, world, '!');
+            std::string str3 = concat("Hello, ", world, '!');
+
+            CHECK(str1 == expected);
+            CHECK(str2 == expected);
+            CHECK(str3 == expected);
+        }
+
+        SECTION("alt_string_iter")
+        {
+            alt_string_iter str = concat<alt_string_iter>(hello_iter, world, '!');
+
+            CHECK(str.impl == expected);
+        }
+
+        SECTION("alt_string_data")
+        {
+            alt_string_data str = concat<alt_string_data>(hello_data, world, '!');
+
+            CHECK(str.impl == expected);
+        }
+    }
+}

source/lib/json/tests/src/unit-custom-base-class.cpp

@@ -0,0 +1,356 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (test suite)
+|  |  |__   |  |  | | | |  version 3.10.2
+|_____|_____|_____|_|___|  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 <set>
+#include <sstream>
+#include <string>
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+
+// Test extending nlohmann::json by using a custom base class.
+// Add some metadata to each node and test the behaviour of copy / move
+template<class MetaDataType>
+class json_metadata
+{
+  public:
+    using metadata_t = MetaDataType;
+    metadata_t& metadata()
+    {
+        return m_metadata;
+    }
+    const metadata_t& metadata() const
+    {
+        return m_metadata;
+    }
+  private:
+    metadata_t m_metadata = {};
+};
+
+template<class T>
+using json_with_metadata =
+    nlohmann::basic_json <
+    std::map,
+    std::vector,
+    std::string,
+    bool,
+    std::int64_t,
+    std::uint64_t,
+    double,
+    std::allocator,
+    nlohmann::adl_serializer,
+    std::vector<std::uint8_t>,
+    json_metadata<T>
+    >;
+
+TEST_CASE("JSON Node Metadata")
+{
+    SECTION("type int")
+    {
+        using json = json_with_metadata<int>;
+        json null;
+        auto obj   = json::object();
+        auto array = json::array();
+
+        null.metadata()  = 1;
+        obj.metadata()   = 2;
+        array.metadata() = 3;
+        auto copy = array;
+
+        CHECK(null.metadata()  == 1);
+        CHECK(obj.metadata()   == 2);
+        CHECK(array.metadata() == 3);
+        CHECK(copy.metadata()  == 3);
+    }
+    SECTION("type vector<int>")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        auto copy = value;
+        value.metadata().emplace_back(2);
+
+        CHECK(copy.metadata().size()  == 1);
+        CHECK(copy.metadata().at(0)   == 1);
+        CHECK(value.metadata().size() == 2);
+        CHECK(value.metadata().at(0)  == 1);
+        CHECK(value.metadata().at(1)  == 2);
+    }
+    SECTION("copy ctor")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        value.metadata().emplace_back(2);
+
+        json copy = value;
+
+        CHECK(copy.metadata().size()  == 2);
+        CHECK(copy.metadata().at(0)   == 1);
+        CHECK(copy.metadata().at(1)   == 2);
+        CHECK(value.metadata().size() == 2);
+        CHECK(value.metadata().at(0)  == 1);
+        CHECK(value.metadata().at(1)  == 2);
+
+        value.metadata().clear();
+        CHECK(copy.metadata().size()  == 2);
+        CHECK(value.metadata().size() == 0);
+    }
+    SECTION("move ctor")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        value.metadata().emplace_back(2);
+
+        const json moved = std::move(value);
+
+        CHECK(moved.metadata().size()  == 2);
+        CHECK(moved.metadata().at(0)   == 1);
+        CHECK(moved.metadata().at(1)   == 2);
+    }
+    SECTION("move assign")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        value.metadata().emplace_back(2);
+
+        json moved;
+        moved = std::move(value);
+
+        CHECK(moved.metadata().size()  == 2);
+        CHECK(moved.metadata().at(0)   == 1);
+        CHECK(moved.metadata().at(1)   == 2);
+    }
+    SECTION("copy assign")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        value.metadata().emplace_back(2);
+
+        json copy;
+        copy = value;
+
+        CHECK(copy.metadata().size()  == 2);
+        CHECK(copy.metadata().at(0)   == 1);
+        CHECK(copy.metadata().at(1)   == 2);
+        CHECK(value.metadata().size() == 2);
+        CHECK(value.metadata().at(0)  == 1);
+        CHECK(value.metadata().at(1)  == 2);
+
+        value.metadata().clear();
+        CHECK(copy.metadata().size()  == 2);
+        CHECK(value.metadata().size() == 0);
+    }
+    SECTION("type unique_ptr<int>")
+    {
+        using json = json_with_metadata<std::unique_ptr<int>>;
+        json value;
+        value.metadata().reset(new int(42)); // NOLINT(cppcoreguidelines-owning-memory)
+        auto moved = std::move(value);
+
+        CHECK(moved.metadata() != nullptr);
+        CHECK(*moved.metadata() == 42);
+    }
+    SECTION("type vector<int> in json array")
+    {
+        using json = json_with_metadata<std::vector<int>>;
+        json value;
+        value.metadata().emplace_back(1);
+        value.metadata().emplace_back(2);
+
+        json const array(10, value);
+
+        CHECK(value.metadata().size() == 2);
+        CHECK(value.metadata().at(0)  == 1);
+        CHECK(value.metadata().at(1)  == 2);
+
+        for (const auto& val : array)
+        {
+            CHECK(val.metadata().size() == 2);
+            CHECK(val.metadata().at(0)  == 1);
+            CHECK(val.metadata().at(1)  == 2);
+        }
+    }
+}
+
+// Test extending nlohmann::json by using a custom base class.
+// Add a custom member function template iterating over the whole json tree.
+class visitor_adaptor
+{
+  public:
+    template <class Fnc>
+    void visit(const Fnc& fnc) const;
+  private:
+    template <class Ptr, class Fnc>
+    void do_visit(const Ptr& ptr, const Fnc& fnc) const;
+};
+
+using json_with_visitor_t = nlohmann::basic_json <
+                            std::map,
+                            std::vector,
+                            std::string,
+                            bool,
+                            std::int64_t,
+                            std::uint64_t,
+                            double,
+                            std::allocator,
+                            nlohmann::adl_serializer,
+                            std::vector<std::uint8_t>,
+                            visitor_adaptor
+                            >;
+
+template <class Fnc>
+void visitor_adaptor::visit(const Fnc& fnc) const
+{
+    do_visit(json_with_visitor_t::json_pointer{}, fnc);
+}
+
+template <class Ptr, class Fnc>
+void visitor_adaptor::do_visit(const Ptr& ptr, const Fnc& fnc) const
+{
+    using value_t = nlohmann::detail::value_t;
+    const json_with_visitor_t& json = *static_cast<const json_with_visitor_t*>(this); // NOLINT(cppcoreguidelines-pro-type-static-cast-downcast)
+    switch (json.type())
+    {
+        case value_t::object:
+            for (const auto& entry : json.items())
+            {
+                entry.value().do_visit(ptr / entry.key(), fnc);
+            }
+            break;
+        case value_t::array:
+            for (std::size_t i = 0; i < json.size(); ++i)
+            {
+                json.at(i).do_visit(ptr / std::to_string(i), fnc);
+            }
+            break;
+        case value_t::discarded:
+            break;
+        case value_t::null:
+        case value_t::string:
+        case value_t::boolean:
+        case value_t::number_integer:
+        case value_t::number_unsigned:
+        case value_t::number_float:
+        case value_t::binary:
+        default:
+            fnc(ptr, json);
+    }
+}
+
+TEST_CASE("JSON Visit Node")
+{
+    json_with_visitor_t json;
+    json["null"];
+    json["int"]  = -1;
+    json["uint"] = 1U;
+    json["float"] = 1.0;
+    json["boolean"] = true;
+    json["string"] = "string";
+    json["array"].push_back(0);
+    json["array"].push_back(1);
+    json["array"].push_back(json);
+
+    std::set<std::string> expected
+    {
+        "/null - null - null",
+        "/int - number_integer - -1",
+        "/uint - number_unsigned - 1",
+        "/float - number_float - 1.0",
+        "/boolean - boolean - true",
+        "/string - string - \"string\"",
+        "/array/0 - number_integer - 0",
+        "/array/1 - number_integer - 1",
+
+        "/array/2/null - null - null",
+        "/array/2/int - number_integer - -1",
+        "/array/2/uint - number_unsigned - 1",
+        "/array/2/float - number_float - 1.0",
+        "/array/2/boolean - boolean - true",
+        "/array/2/string - string - \"string\"",
+        "/array/2/array/0 - number_integer - 0",
+        "/array/2/array/1 - number_integer - 1"
+    };
+
+    json.visit(
+        [&](const json_with_visitor_t::json_pointer & p,
+            const json_with_visitor_t& j)
+    {
+        std::stringstream str;
+        str << p.to_string() << " - " ;
+        using value_t = nlohmann::detail::value_t;
+        switch (j.type())
+        {
+            case value_t::object:
+                str << "object";
+                break;
+            case value_t::array:
+                str << "array";
+                break;
+            case value_t::discarded:
+                str << "discarded";
+                break;
+            case value_t::null:
+                str << "null";
+                break;
+            case value_t::string:
+                str << "string";
+                break;
+            case value_t::boolean:
+                str << "boolean";
+                break;
+            case value_t::number_integer:
+                str << "number_integer";
+                break;
+            case value_t::number_unsigned:
+                str << "number_unsigned";
+                break;
+            case value_t::number_float:
+                str << "number_float";
+                break;
+            case value_t::binary:
+                str << "binary";
+                break;
+            default:
+                str << "error";
+                break;
+        }
+        str << " - "  << j.dump();
+        CHECK(json.at(p) == j);
+        INFO(str.str());
+        CHECK(expected.count(str.str()) == 1);
+        expected.erase(str.str());
+    }
+    );
+    CHECK(expected.empty());
+}

source/lib/json/tests/src/unit-diagnostics.cpp

@@ -0,0 +1,246 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#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 const 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")
+    {
+        json _;
+        CHECK_THROWS_WITH_AS(_ = json::parse(""), "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error);
+    }
+
+    SECTION("Wrong type in update()")
+    {
+        json j = {{"foo", "bar"}};
+        json k = {{"bla", 1}};
+
+        CHECK_THROWS_WITH_AS(j.update(k["bla"].begin(), k["bla"].end()), "[json.exception.type_error.312] (/bla) cannot use update() with number", json::type_error);
+        CHECK_THROWS_WITH_AS(j.update(k["bla"]), "[json.exception.type_error.312] (/bla) cannot use update() with number", json::type_error);
+    }
+}
+
+TEST_CASE("Regression tests for extended diagnostics")
+{
+    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);
+    }
+
+    SECTION("Regression test for issue #2838 - Assertion failure when inserting into arrays with JSON_DIAGNOSTICS set")
+    {
+        // void push_back(basic_json&& val)
+        {
+            json j_arr = json::array();
+            j_arr.push_back(json::object());
+            j_arr.push_back(json::object());
+            j_arr.push_back(json::object());
+            j_arr.push_back(json::object());
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+
+        // void push_back(const basic_json& val)
+        {
+            json j_arr = json::array();
+            auto object = json::object();
+            j_arr.push_back(object);
+            j_arr.push_back(object);
+            j_arr.push_back(object);
+            j_arr.push_back(object);
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+
+        // reference emplace_back(Args&& ... args)
+        {
+            json j_arr = json::array();
+            j_arr.emplace_back(json::object());
+            j_arr.emplace_back(json::object());
+            j_arr.emplace_back(json::object());
+            j_arr.emplace_back(json::object());
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+
+        // iterator insert(const_iterator pos, const basic_json& val)
+        {
+            json j_arr = json::array();
+            j_arr.insert(j_arr.begin(), json::object());
+            j_arr.insert(j_arr.begin(), json::object());
+            j_arr.insert(j_arr.begin(), json::object());
+            j_arr.insert(j_arr.begin(), json::object());
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+
+        // iterator insert(const_iterator pos, size_type cnt, const basic_json& val)
+        {
+            json j_arr = json::array();
+            j_arr.insert(j_arr.begin(), 2, json::object());
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+
+        // iterator insert(const_iterator pos, const_iterator first, const_iterator last)
+        {
+            json j_arr = json::array();
+            json j_objects = {json::object(), json::object()};
+            j_arr.insert(j_arr.begin(), j_objects.begin(), j_objects.end());
+            json j_obj = json::object();
+            j_obj["key"] = j_arr;
+        }
+    }
+
+    SECTION("Regression test for issue #2962 - JSON_DIAGNOSTICS assertion for ordered_json")
+    {
+        nlohmann::ordered_json j;
+        nlohmann::ordered_json j2;
+        const std::string value;
+        j["first"] = value;
+        j["second"] = value;
+        j2["something"] = j;
+    }
+
+    SECTION("Regression test for issue #3007 - Parent pointers properly set when using update()")
+    {
+        // void update(const_reference j)
+        {
+            json j = json::object();
+
+            {
+                json j2 = json::object();
+                j2["one"] = 1;
+
+                j.update(j2);
+            }
+
+            // Must call operator[] on const element, otherwise m_parent gets updated.
+            auto const& constJ = j;
+            CHECK_THROWS_WITH_AS(constJ["one"].at(0), "[json.exception.type_error.304] (/one) cannot use at() with number", json::type_error);
+        }
+
+        // void update(const_iterator first, const_iterator last)
+        {
+            json j = json::object();
+
+            {
+                json j2 = json::object();
+                j2["one"] = 1;
+
+                j.update(j2.begin(), j2.end());
+            }
+
+            // Must call operator[] on const element, otherwise m_parent gets updated.
+            auto const& constJ = j;
+            CHECK_THROWS_WITH_AS(constJ["one"].at(0), "[json.exception.type_error.304] (/one) cannot use at() with number", json::type_error);
+        }
+
+        // Code from #3007 triggering unwanted assertion without fix to update().
+        {
+            json root = json::array();
+            json lower = json::object();
+
+            {
+                json lowest = json::object();
+                lowest["one"] = 1;
+
+                lower.update(lowest);
+            }
+
+            root.push_back(lower);
+        }
+    }
+
+    SECTION("Regression test for issue #3032 - Yet another assertion failure when inserting into arrays with JSON_DIAGNOSTICS set")
+    {
+        // reference operator[](size_type idx)
+        {
+            json j_arr = json::array();
+            j_arr[0] = 0;
+            j_arr[1] = 1;
+            j_arr[2] = 2;
+            j_arr[3] = 3;
+            j_arr[4] = 4;
+            j_arr[5] = 5;
+            j_arr[6] = 6;
+            j_arr[7] = 7;
+            json const j_arr_copy = j_arr;
+        }
+    }
+}

source/lib/json/tests/src/unit-disabled_exceptions.cpp

@@ -0,0 +1,52 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+// disable -Wnoexcept as exceptions are switched off for this test suite
+DOCTEST_GCC_SUPPRESS_WARNING_PUSH
+DOCTEST_GCC_SUPPRESS_WARNING("-Wnoexcept")
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+/////////////////////////////////////////////////////////////////////
+// for #2824
+/////////////////////////////////////////////////////////////////////
+
+class sax_no_exception : public nlohmann::detail::json_sax_dom_parser<json>
+{
+  public:
+    explicit sax_no_exception(json& j) : nlohmann::detail::json_sax_dom_parser<json>(j, false) {}
+
+    static bool parse_error(std::size_t /*position*/, const std::string& /*last_token*/, const json::exception& ex)
+    {
+        error_string = new std::string(ex.what()); // NOLINT(cppcoreguidelines-owning-memory)
+        return false;
+    }
+
+    static std::string* error_string;
+};
+
+std::string* sax_no_exception::error_string = nullptr;
+
+TEST_CASE("Tests with disabled exceptions")
+{
+    SECTION("issue #2824 - encoding of json::exception::what()")
+    {
+        json j;
+        sax_no_exception sax(j);
+
+        CHECK (!json::sax_parse("xyz", &sax));
+        CHECK(*sax_no_exception::error_string == "[json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - invalid literal; last read: 'x'");
+        delete sax_no_exception::error_string; // NOLINT(cppcoreguidelines-owning-memory)
+    }
+}
+
+DOCTEST_GCC_SUPPRESS_WARNING_POP

source/lib/json/tests/src/unit-element_access1.cpp

@@ -0,0 +1,881 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+TEST_CASE("element access 1")
+{
+    SECTION("array")
+    {
+        json j = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+        const json j_const = j;
+
+        SECTION("access specified element with bounds checking")
+        {
+            SECTION("access within bounds")
+            {
+                CHECK(j.at(0) == json(1));
+                CHECK(j.at(1) == json(1u));
+                CHECK(j.at(2) == json(true));
+                CHECK(j.at(3) == json(nullptr));
+                CHECK(j.at(4) == json("string"));
+                CHECK(j.at(5) == json(42.23));
+                CHECK(j.at(6) == json::object());
+                CHECK(j.at(7) == json({1, 2, 3}));
+
+                CHECK(j_const.at(0) == json(1));
+                CHECK(j_const.at(1) == json(1u));
+                CHECK(j_const.at(2) == json(true));
+                CHECK(j_const.at(3) == json(nullptr));
+                CHECK(j_const.at(4) == json("string"));
+                CHECK(j_const.at(5) == json(42.23));
+                CHECK(j_const.at(6) == json::object());
+                CHECK(j_const.at(7) == json({1, 2, 3}));
+            }
+
+            SECTION("access outside bounds")
+            {
+                CHECK_THROWS_WITH_AS(j.at(8),
+                                     "[json.exception.out_of_range.401] array index 8 is out of range", json::out_of_range&);
+                CHECK_THROWS_WITH_AS(j_const.at(8),
+                                     "[json.exception.out_of_range.401] array index 8 is out of range", json::out_of_range&);
+            }
+
+            SECTION("access on non-array type")
+            {
+                SECTION("null")
+                {
+                    json j_nonarray(json::value_t::null);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with null", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with null", json::type_error&);
+                }
+
+                SECTION("boolean")
+                {
+                    json j_nonarray(json::value_t::boolean);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with boolean", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with boolean", json::type_error&);
+                }
+
+                SECTION("string")
+                {
+                    json j_nonarray(json::value_t::string);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with string", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with string", json::type_error&);
+                }
+
+                SECTION("object")
+                {
+                    json j_nonarray(json::value_t::object);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with object", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with object", json::type_error&);
+                }
+
+                SECTION("number (integer)")
+                {
+                    json j_nonarray(json::value_t::number_integer);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                }
+
+                SECTION("number (unsigned)")
+                {
+                    json j_nonarray(json::value_t::number_unsigned);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                }
+
+                SECTION("number (floating-point)")
+                {
+                    json j_nonarray(json::value_t::number_float);
+                    const json j_nonarray_const(j_nonarray);
+
+                    CHECK_THROWS_WITH_AS(j_nonarray.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const.at(0), "[json.exception.type_error.304] cannot use at() with number", json::type_error&);
+                }
+            }
+        }
+
+        SECTION("front and back")
+        {
+            CHECK(j.front() == json(1));
+            CHECK(j_const.front() == json(1));
+            CHECK(j.back() == json({1, 2, 3}));
+            CHECK(j_const.back() == json({1, 2, 3}));
+        }
+
+        SECTION("access specified element")
+        {
+            SECTION("access within bounds")
+            {
+                CHECK(j[0] == json(1));
+                CHECK(j[1] == json(1u));
+                CHECK(j[2] == json(true));
+                CHECK(j[3] == json(nullptr));
+                CHECK(j[4] == json("string"));
+                CHECK(j[5] == json(42.23));
+                CHECK(j[6] == json::object());
+                CHECK(j[7] == json({1, 2, 3}));
+
+                CHECK(j_const[0] == json(1));
+                CHECK(j_const[1] == json(1u));
+                CHECK(j_const[2] == json(true));
+                CHECK(j_const[3] == json(nullptr));
+                CHECK(j_const[4] == json("string"));
+                CHECK(j_const[5] == json(42.23));
+                CHECK(j_const[6] == json::object());
+                CHECK(j_const[7] == json({1, 2, 3}));
+            }
+
+            SECTION("access on non-array type")
+            {
+                SECTION("null")
+                {
+                    SECTION("standard tests")
+                    {
+                        json j_nonarray(json::value_t::null);
+                        const json j_nonarray_const(j_nonarray);
+                        CHECK_NOTHROW(j_nonarray[0]);
+                        CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with null", json::type_error&);
+                    }
+
+                    SECTION("implicit transformation to properly filled array")
+                    {
+                        json j_nonarray;
+                        j_nonarray[3] = 42;
+                        CHECK(j_nonarray == json({nullptr, nullptr, nullptr, 42}));
+                    }
+                }
+
+                SECTION("boolean")
+                {
+                    json j_nonarray(json::value_t::boolean);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with boolean", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with boolean", json::type_error&);
+                }
+
+                SECTION("string")
+                {
+                    json j_nonarray(json::value_t::string);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with string", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with string", json::type_error&);
+                }
+
+                SECTION("object")
+                {
+                    json j_nonarray(json::value_t::object);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with object", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with object", json::type_error&);
+                }
+
+                SECTION("number (integer)")
+                {
+                    json j_nonarray(json::value_t::number_integer);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                }
+
+                SECTION("number (unsigned)")
+                {
+                    json j_nonarray(json::value_t::number_unsigned);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                }
+
+                SECTION("number (floating-point)")
+                {
+                    json j_nonarray(json::value_t::number_float);
+                    const json j_nonarray_const(j_nonarray);
+                    CHECK_THROWS_WITH_AS(j_nonarray[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                    CHECK_THROWS_WITH_AS(j_nonarray_const[0], "[json.exception.type_error.305] cannot use operator[] with a numeric argument with number", json::type_error&);
+                }
+            }
+        }
+
+        SECTION("remove specified element")
+        {
+            SECTION("remove element by index")
+            {
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(0);
+                    CHECK(jarray == json({1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(1);
+                    CHECK(jarray == json({1, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(2);
+                    CHECK(jarray == json({1, 1u, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(3);
+                    CHECK(jarray == json({1, 1u, true, "string", 42.23, json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(4);
+                    CHECK(jarray == json({1, 1u, true, nullptr, 42.23, json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(5);
+                    CHECK(jarray == json({1, 1u, true, nullptr, "string", json::object(), {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(6);
+                    CHECK(jarray == json({1, 1u, true, nullptr, "string", 42.23, {1, 2, 3}}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    jarray.erase(7);
+                    CHECK(jarray == json({1, 1u, true, nullptr, "string", 42.23, json::object()}));
+                }
+                {
+                    json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                    CHECK_THROWS_WITH_AS(jarray.erase(8), "[json.exception.out_of_range.401] array index 8 is out of range", json::out_of_range&);
+                }
+            }
+
+            SECTION("remove element by iterator")
+            {
+                SECTION("erase(begin())")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::iterator const it2 = jarray.erase(jarray.begin());
+                        CHECK(jarray == json({1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(1u));
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::const_iterator const it2 = jarray.erase(jarray.cbegin());
+                        CHECK(jarray == json({1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(1u));
+                    }
+                }
+
+                SECTION("erase(begin(), end())")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::iterator it2 = jarray.erase(jarray.begin(), jarray.end());
+                        CHECK(jarray == json::array());
+                        CHECK(it2 == jarray.end());
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::const_iterator it2 = jarray.erase(jarray.cbegin(), jarray.cend());
+                        CHECK(jarray == json::array());
+                        CHECK(it2 == jarray.cend());
+                    }
+                }
+
+                SECTION("erase(begin(), begin())")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::iterator const it2 = jarray.erase(jarray.begin(), jarray.begin());
+                        CHECK(jarray == json({1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(1));
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::const_iterator const it2 = jarray.erase(jarray.cbegin(), jarray.cbegin());
+                        CHECK(jarray == json({1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(1));
+                    }
+                }
+
+                SECTION("erase at offset")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::iterator const it = jarray.begin() + 4;
+                        json::iterator const it2 = jarray.erase(it);
+                        CHECK(jarray == json({1, 1u, true, nullptr, 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(42.23));
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::const_iterator const it = jarray.cbegin() + 4;
+                        json::const_iterator const it2 = jarray.erase(it);
+                        CHECK(jarray == json({1, 1u, true, nullptr, 42.23, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json(42.23));
+                    }
+                }
+
+                SECTION("erase subrange")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::iterator const it2 = jarray.erase(jarray.begin() + 3, jarray.begin() + 6);
+                        CHECK(jarray == json({1, 1u, true, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json::object());
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json::const_iterator const it2 = jarray.erase(jarray.cbegin() + 3, jarray.cbegin() + 6);
+                        CHECK(jarray == json({1, 1u, true, json::object(), {1, 2, 3}}));
+                        CHECK(*it2 == json::object());
+                    }
+                }
+
+                SECTION("different arrays")
+                {
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json jarray2 = {"foo", "bar"};
+
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.begin()),
+                                             "[json.exception.invalid_iterator.202] iterator does not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray.begin(), jarray2.end()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.begin(), jarray.end()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.begin(), jarray2.end()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                    }
+                    {
+                        json jarray = {1, 1u, true, nullptr, "string", 42.23, json::object(), {1, 2, 3}};
+                        json const jarray2 = {"foo", "bar"};
+
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.cbegin()),
+                                             "[json.exception.invalid_iterator.202] iterator does not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray.cbegin(), jarray2.cend()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.cbegin(), jarray.cend()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                        CHECK_THROWS_WITH_AS(jarray.erase(jarray2.cbegin(), jarray2.cend()),
+                                             "[json.exception.invalid_iterator.203] iterators do not fit current value", json::invalid_iterator&);
+                    }
+                }
+            }
+
+            SECTION("remove element by index in non-array type")
+            {
+                SECTION("null")
+                {
+                    json j_nonobject(json::value_t::null);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with null", json::type_error&);
+                }
+
+                SECTION("boolean")
+                {
+                    json j_nonobject(json::value_t::boolean);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with boolean", json::type_error&);
+                }
+
+                SECTION("string")
+                {
+                    json j_nonobject(json::value_t::string);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with string", json::type_error&);
+                }
+
+                SECTION("object")
+                {
+                    json j_nonobject(json::value_t::object);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with object", json::type_error&);
+                }
+
+                SECTION("number (integer)")
+                {
+                    json j_nonobject(json::value_t::number_integer);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with number", json::type_error&);
+                }
+
+                SECTION("number (unsigned)")
+                {
+                    json j_nonobject(json::value_t::number_unsigned);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with number", json::type_error&);
+                }
+
+                SECTION("number (floating-point)")
+                {
+                    json j_nonobject(json::value_t::number_float);
+                    CHECK_THROWS_WITH_AS(j_nonobject.erase(0), "[json.exception.type_error.307] cannot use erase() with number", json::type_error&);
+                }
+            }
+        }
+    }
+
+    SECTION("other values")
+    {
+        SECTION("front and back")
+        {
+            SECTION("null")
+            {
+                {
+                    json j;
+                    CHECK_THROWS_WITH_AS(j.front(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.back(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+                }
+                {
+                    const json j{};
+                    CHECK_THROWS_WITH_AS(j.front(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.back(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("string")
+            {
+                {
+                    json j = "foo";
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+                {
+                    const json j = "bar";
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+            }
+
+            SECTION("number (boolean)")
+            {
+                {
+                    json j = false;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+                {
+                    const json j = true;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+            }
+
+            SECTION("number (integer)")
+            {
+                {
+                    json j = 17;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+                {
+                    const json j = 17;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+            }
+
+            SECTION("number (unsigned)")
+            {
+                {
+                    json j = 17u;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+                {
+                    const json j = 17u;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+            }
+
+            SECTION("number (floating point)")
+            {
+                {
+                    json j = 23.42;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+                {
+                    const json j = 23.42;
+                    CHECK(j.front() == j);
+                    CHECK(j.back() == j);
+                }
+            }
+        }
+
+        SECTION("erase with one valid iterator")
+        {
+            SECTION("null")
+            {
+                {
+                    json j;
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin()), "[json.exception.type_error.307] cannot use erase() with null", json::type_error&);
+                }
+                {
+                    json j;
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin()),
+                                         "[json.exception.type_error.307] cannot use erase() with null", json::type_error&);
+                }
+            }
+
+            SECTION("string")
+            {
+                {
+                    json j = "foo";
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = "bar";
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (boolean)")
+            {
+                {
+                    json j = false;
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = true;
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (integer)")
+            {
+                {
+                    json j = 17;
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 17;
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (unsigned)")
+            {
+                {
+                    json j = 17u;
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 17u;
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (floating point)")
+            {
+                {
+                    json j = 23.42;
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 23.42;
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("binary")
+            {
+                {
+                    json j = json::binary({1, 2, 3});
+                    json::iterator it = j.erase(j.begin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = json::binary({1, 2, 3});
+                    json::const_iterator it = j.erase(j.cbegin());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+        }
+
+        SECTION("erase with one invalid iterator")
+        {
+            SECTION("string")
+            {
+                {
+                    json j = "foo";
+                    CHECK_THROWS_WITH_AS(j.erase(j.end()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = "bar";
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (boolean)")
+            {
+                {
+                    json j = false;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = true;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (integer)")
+            {
+                {
+                    json j = 17;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 17;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (unsigned)")
+            {
+                {
+                    json j = 17u;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 17u;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (floating point)")
+            {
+                {
+                    json j = 23.42;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 23.42;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend()), "[json.exception.invalid_iterator.205] iterator out of range", json::invalid_iterator&);
+                }
+            }
+        }
+
+        SECTION("erase with two valid iterators")
+        {
+            SECTION("null")
+            {
+                {
+                    json j;
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.end()), "[json.exception.type_error.307] cannot use erase() with null", json::type_error&);
+                }
+                {
+                    json j;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cend()), "[json.exception.type_error.307] cannot use erase() with null", json::type_error&);
+                }
+            }
+
+            SECTION("string")
+            {
+                {
+                    json j = "foo";
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = "bar";
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (boolean)")
+            {
+                {
+                    json j = false;
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = true;
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (integer)")
+            {
+                {
+                    json j = 17;
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 17;
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (unsigned)")
+            {
+                {
+                    json j = 17u;
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 17u;
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("number (floating point)")
+            {
+                {
+                    json j = 23.42;
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = 23.42;
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+
+            SECTION("binary")
+            {
+                {
+                    json j = json::binary({1, 2, 3});
+                    json::iterator it = j.erase(j.begin(), j.end());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+                {
+                    json j = json::binary({1, 2, 3});
+                    json::const_iterator it = j.erase(j.cbegin(), j.cend());
+                    CHECK(j.type() == json::value_t::null);
+                    CHECK(it == j.end());
+                }
+            }
+        }
+
+        SECTION("erase with two invalid iterators")
+        {
+            SECTION("string")
+            {
+                {
+                    json j = "foo";
+                    CHECK_THROWS_WITH_AS(j.erase(j.end(), j.end()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.begin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = "bar";
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend(), j.cend()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cbegin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (boolean)")
+            {
+                {
+                    json j = false;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end(), j.end()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.begin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = true;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend(), j.cend()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cbegin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (integer)")
+            {
+                {
+                    json j = 17;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end(), j.end()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.begin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 17;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend(), j.cend()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cbegin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (unsigned)")
+            {
+                {
+                    json j = 17u;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end(), j.end()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.begin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 17u;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend(), j.cend()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cbegin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+            }
+
+            SECTION("number (floating point)")
+            {
+                {
+                    json j = 23.42;
+                    CHECK_THROWS_WITH_AS(j.erase(j.end(), j.end()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.begin(), j.begin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+                {
+                    json j = 23.42;
+                    CHECK_THROWS_WITH_AS(j.erase(j.cend(), j.cend()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                    CHECK_THROWS_WITH_AS(j.erase(j.cbegin(), j.cbegin()), "[json.exception.invalid_iterator.204] iterators out of range", json::invalid_iterator&);
+                }
+            }
+        }
+    }
+}

source/lib/json/tests/src/unit-hash.cpp

@@ -0,0 +1,113 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+using ordered_json = nlohmann::ordered_json;
+
+#include <set>
+
+TEST_CASE("hash<nlohmann::json>")
+{
+    // 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(static_cast<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);
+}
+
+TEST_CASE("hash<nlohmann::ordered_json>")
+{
+    // 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<ordered_json> {}(ordered_json(nullptr)));
+
+    // boolean
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(true)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(false)));
+
+    // string
+    hashes.insert(std::hash<ordered_json> {}(ordered_json("")));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json("foo")));
+
+    // number
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(0)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(static_cast<unsigned>(0))));
+
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(-1)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(0.0)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(42.23)));
+
+    // array
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::array()));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::array({1, 2, 3})));
+
+    // object
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::object()));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::object({{"foo", "bar"}})));
+
+    // binary
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({})));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({}, 0)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({}, 42)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3})));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3}, 0)));
+    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3}, 42)));
+
+    // discarded
+    hashes.insert(std::hash<ordered_json> {}(ordered_json(ordered_json::value_t::discarded)));
+
+    CHECK(hashes.size() == 21);
+}

source/lib/json/tests/src/unit-inspection.cpp

@@ -0,0 +1,459 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+// |  |  |__   |  |  | | | |  version 3.11.2
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+#include <fstream>
+#include <sstream>
+#include "make_test_data_available.hpp"
+
+TEST_CASE("object inspection")
+{
+    SECTION("convenience type checker")
+    {
+        SECTION("object")
+        {
+            json const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const 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 const j1 = json::parse(s);
+            std::string s1 = j1.dump();
+            json const j2 = json::parse(s1);
+            std::string s2 = j2.dump();
+            CHECK(s1 == s2);
+        }
+    }
+
+    SECTION("return the type of the object (explicit)")
+    {
+        SECTION("null")
+        {
+            json const j = nullptr;
+            CHECK(j.type() == json::value_t::null);
+        }
+
+        SECTION("object")
+        {
+            json const j = {{"foo", "bar"}};
+            CHECK(j.type() == json::value_t::object);
+        }
+
+        SECTION("array")
+        {
+            json const j = {1, 2, 3, 4};
+            CHECK(j.type() == json::value_t::array);
+        }
+
+        SECTION("boolean")
+        {
+            json const j = true;
+            CHECK(j.type() == json::value_t::boolean);
+        }
+
+        SECTION("string")
+        {
+            json const j = "Hello world";
+            CHECK(j.type() == json::value_t::string);
+        }
+
+        SECTION("number (integer)")
+        {
+            json const j = 23;
+            CHECK(j.type() == json::value_t::number_integer);
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json const j = 23u;
+            CHECK(j.type() == json::value_t::number_unsigned);
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json const j = 42.23;
+            CHECK(j.type() == json::value_t::number_float);
+        }
+    }
+
+    SECTION("return the type of the object (implicit)")
+    {
+        SECTION("null")
+        {
+            json const j = nullptr;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("object")
+        {
+            json const j = {{"foo", "bar"}};
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("array")
+        {
+            json const j = {1, 2, 3, 4};
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("boolean")
+        {
+            json const j = true;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("string")
+        {
+            json const j = "Hello world";
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (integer)")
+        {
+            json const j = 23;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (unsigned)")
+        {
+            json const j = 23u;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("number (floating-point)")
+        {
+            json const j = 42.23;
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+
+        SECTION("binary")
+        {
+            json const j = json::binary({});
+            json::value_t t = j;
+            CHECK(t == j.type());
+        }
+    }
+}