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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/macros/" rel="canonical"><link href=../enum_conversion/ rel=prev><link href=../trailing_commas/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Supported Macros - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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href=../comments/ class=md-nav__link> <span class=md-ellipsis> Comments </span> </a> </li> <li class=md-nav__item> <a href=../conversions/ class=md-nav__link> <span class=md-ellipsis> Converting values </span> </a> </li> <li class=md-nav__item> <a href=../creating_values/ class=md-nav__link> <span class=md-ellipsis> Creating JSON values </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_8> <div class="md-nav__link md-nav__container"> <a href=../element_access/ class="md-nav__link "> <span class=md-ellipsis> Element Access </span> </a> <label class="md-nav__link " for=__nav_2_8 id=__nav_2_8_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_8_label aria-expanded=false> <label class=md-nav__title for=__nav_2_8> <span class="md-nav__icon md-icon"></span> Element Access </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../element_access/unchecked_access/ class=md-nav__link> <span class=md-ellipsis> Unchecked access: operator[] </span> </a> </li> <li class=md-nav__item> <a href=../element_access/checked_access/ class=md-nav__link> <span class=md-ellipsis> Checked access: at </span> </a> </li> <li class=md-nav__item> <a href=../element_access/default_value/ class=md-nav__link> <span class=md-ellipsis> Access with default value: value </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../iterators/ class=md-nav__link> <span class=md-ellipsis> Iterators </span> </a> </li> <li class=md-nav__item> <a href=../merge_patch/ class=md-nav__link> <span class=md-ellipsis> JSON Merge Patch </span> </a> </li> <li class=md-nav__item> <a href=../json_patch/ class=md-nav__link> <span class=md-ellipsis> JSON Patch and Diff </span> </a> </li> <li class=md-nav__item> <a href=../json_pointer/ class=md-nav__link> <span class=md-ellipsis> JSON Pointer </span> </a> </li> <li class=md-nav__item> <a href=../modifying_values/ class=md-nav__link> <span class=md-ellipsis> Modifying values </span> </a> </li> <li class=md-nav__item> <a href=../modules/ class=md-nav__link> <span class=md-ellipsis> Modules </span> </a> </li> <li class=md-nav__item> <a href=../namespace/ class=md-nav__link> <span class=md-ellipsis> nlohmann Namespace </span> </a> </li> <li class=md-nav__item> <a href=../object_order/ class=md-nav__link> <span class=md-ellipsis> Object Order </span> </a> </li> <li class=md-nav__item> <a href=../performance/ class=md-nav__link> <span class=md-ellipsis> Performance </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_18> <div class="md-nav__link md-nav__container"> <a href=../parsing/ class="md-nav__link "> <span class=md-ellipsis> Parsing </span> </a> <label class="md-nav__link " for=__nav_2_18 id=__nav_2_18_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_18_label aria-expanded=false> <label class=md-nav__title for=__nav_2_18> <span class="md-nav__icon md-icon"></span> Parsing </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../parsing/json_lines/ class=md-nav__link> <span class=md-ellipsis> JSON Lines </span> </a> </li> <li class=md-nav__item> <a href=../parsing/parse_exceptions/ class=md-nav__link> <span class=md-ellipsis> Parsing and Exceptions </span> </a> </li> <li class=md-nav__item> <a href=../parsing/parser_callbacks/ class=md-nav__link> <span class=md-ellipsis> Parser Callbacks </span> </a> </li> <li class=md-nav__item> <a href=../parsing/sax_interface/ class=md-nav__link> <span class=md-ellipsis> SAX Interface </span> </a> </li> <li class=md-nav__item> <a href=../parsing/untrusted_input/ class=md-nav__link> <span class=md-ellipsis> Parsing Untrusted Input </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../assertions/ class=md-nav__link> <span class=md-ellipsis> Runtime Assertions </span> </a> </li> <li class=md-nav__item> <a href=../serialization/ class=md-nav__link> <span class=md-ellipsis> Serialization </span> </a> </li> <li class=md-nav__item> <a href=../enum_conversion/ class=md-nav__link> <span class=md-ellipsis> Specializing enum conversion </span> </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> <span class=md-ellipsis> Supported Macros </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Supported Macros </span> </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#json_assertx class=md-nav__link> <span class=md-ellipsis> JSON_ASSERT(x) </span> </a> </li> <li class=md-nav__item> <a href=#json_brace_init_copy_semantics class=md-nav__link> <span class=md-ellipsis> JSON_BRACE_INIT_COPY_SEMANTICS </span> </a> </li> <li class=md-nav__item> <a href=#json_catch_userexception class=md-nav__link> <span class=md-ellipsis> JSON_CATCH_USER(exception) </span> </a> </li> <li class=md-nav__item> <a href=#json_delete_deprecated_functions class=md-nav__link> <span class=md-ellipsis> JSON_DELETE_DEPRECATED_FUNCTIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_diagnostics class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTICS </span> </a> </li> <li class=md-nav__item> <a href=#json_diagnostic_positions class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTIC_POSITIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20-json_has_cpp_23-json_has_cpp_26 class=md-nav__link> <span class=md-ellipsis> JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20, JSON_HAS_CPP_23, JSON_HAS_CPP_26 </span> </a> </li> <li class=md-nav__item> <a href=#json_has_filesystem-json_has_experimental_filesystem class=md-nav__link> <span class=md-ellipsis> JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM </span> </a> </li> <li class=md-nav__item> <a href=#json_noexception class=md-nav__link> <span class=md-ellipsis> JSON_NOEXCEPTION </span> </a> </li> <li class=md-nav__item> <a href=#json_disable_enum_serialization class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_ENUM_SERIALIZATION </span> </a> </li> <li class=md-nav__item> <a href=#json_disable_tuple_reference_conversion class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_TUPLE_REFERENCE_CONVERSION </span> </a> </li> <li class=md-nav__item> <a href=#json_no_automatic_udls class=md-nav__link> <span class=md-ellipsis> JSON_NO_AUTOMATIC_UDLS </span> </a> </li> <li class=md-nav__item> <a href=#json_no_io class=md-nav__link> <span class=md-ellipsis> JSON_NO_IO </span> </a> </li> <li class=md-nav__item> <a href=#json_no_thread_local class=md-nav__link> <span class=md-ellipsis> JSON_NO_THREAD_LOCAL </span> </a> </li> <li class=md-nav__item> <a href=#json_precise_stream_position class=md-nav__link> <span class=md-ellipsis> JSON_PRECISE_STREAM_POSITION </span> </a> </li> <li class=md-nav__item> <a href=#json_skip_library_version_check class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_LIBRARY_VERSION_CHECK </span> </a> </li> <li class=md-nav__item> <a href=#json_skip_unsupported_compiler_check class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_UNSUPPORTED_COMPILER_CHECK </span> </a> </li> <li class=md-nav__item> <a href=#json_strict_binary_utf8 class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_BINARY_UTF8 </span> </a> </li> <li class=md-nav__item> <a href=#json_strict_nul_handling class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_NUL_HANDLING </span> </a> </li> <li class=md-nav__item> <a href=#json_throw_userexception class=md-nav__link> <span class=md-ellipsis> JSON_THROW_USER(exception) </span> </a> </li> <li class=md-nav__item> <a href=#json_try_user class=md-nav__link> <span class=md-ellipsis> JSON_TRY_USER </span> </a> </li> <li class=md-nav__item> <a href=#json_use_implicit_conversions class=md-nav__link> <span class=md-ellipsis> JSON_USE_IMPLICIT_CONVERSIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_global_udls class=md-nav__link> <span class=md-ellipsis> JSON_USE_GLOBAL_UDLS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_legacy_discarded_value_comparison class=md-nav__link> <span class=md-ellipsis> JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=#json_use_objects_for_enum_keyed_maps class=md-nav__link> <span class=md-ellipsis> JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_simdutf class=md-nav__link> <span class=md-ellipsis> JSON_USE_SIMDUTF </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_define_type_-nlohmann_define_derived_type_ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...) </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_namespace-nlohmann_json_namespace_begin-nlohmann_json_namespace_end-nlohmann_json_namespace_no_version class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE, NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END, NLOHMANN_JSON_NAMESPACE_NO_VERSION </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_serialize_enumtype class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM(type, ...) </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../trailing_commas/ class=md-nav__link> <span class=md-ellipsis> Trailing Commas </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_24> <div class="md-nav__link md-nav__container"> <a href=../types/ class="md-nav__link "> <span class=md-ellipsis> Types </span> </a> <label class="md-nav__link " for=__nav_2_24 id=__nav_2_24_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_24_label aria-expanded=false> <label class=md-nav__title for=__nav_2_24> <span class="md-nav__icon md-icon"></span> Types </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../types/number_handling/ class=md-nav__link> <span class=md-ellipsis> Number Handling </span> </a> </li> <li class=md-nav__item> <a href=../types/template_parameters/ class=md-nav__link> <span class=md-ellipsis> Template Parameter Requirements </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3> <div class="md-nav__link md-nav__container"> <a href=../../integration/ class="md-nav__link "> <span class=md-ellipsis> Integration </span> </a> <label class="md-nav__link " for=__nav_3 id=__nav_3_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_3_label aria-expanded=false> <label class=md-nav__title for=__nav_3> <span class="md-nav__icon md-icon"></span> Integration </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../integration/migration_guide/ class=md-nav__link> <span class=md-ellipsis> Migration Guide </span> </a> </li> <li class=md-nav__item> <a href=../../integration/cmake/ class=md-nav__link> <span class=md-ellipsis> CMake </span> </a> </li> <li class=md-nav__item> <a href=../../integration/package_managers/ class=md-nav__link> <span class=md-ellipsis> Package Managers </span> </a> </li> <li class=md-nav__item> <a href=../../integration/pkg-config/ class=md-nav__link> <span class=md-ellipsis> Pkg-config </span> </a> </li> <li class=md-nav__item> <a href=../../integration/compile_times/ class=md-nav__link> <span class=md-ellipsis> Compile times </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4 id=__nav_4_label tabindex=0> <span class=md-ellipsis> API Documentation </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_4_label aria-expanded=false> <label class=md-nav__title for=__nav_4> <span class="md-nav__icon md-icon"></span> API Documentation </label> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_1> <div class="md-nav__link md-nav__container"> <a href=../../api/basic_json/ class="md-nav__link "> <span class=md-ellipsis> basic_json </span> </a> <label class="md-nav__link " for=__nav_4_1 id=__nav_4_1_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_1_label aria-expanded=false> <label class=md-nav__title for=__nav_4_1> <span class="md-nav__icon md-icon"></span> basic_json </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/basic_json/basic_json/ class=md-nav__link> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/~basic_json/ class=md-nav__link> <span class=md-ellipsis> (Destructor) </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/accept/ class=md-nav__link> <span class=md-ellipsis> accept </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/array/ class=md-nav__link> <span class=md-ellipsis> array </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/array_t/ class=md-nav__link> <span class=md-ellipsis> array_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/as_base_class/ class=md-nav__link> <span class=md-ellipsis> as_base_class </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/at/ class=md-nav__link> <span class=md-ellipsis> at </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/back/ class=md-nav__link> <span class=md-ellipsis> back </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/begin/ class=md-nav__link> <span class=md-ellipsis> begin </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/binary/ class=md-nav__link> <span class=md-ellipsis> binary </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/binary_t/ class=md-nav__link> <span class=md-ellipsis> binary_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/boolean_t/ class=md-nav__link> <span class=md-ellipsis> boolean_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/cbegin/ class=md-nav__link> <span class=md-ellipsis> cbegin </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/cbor_tag_handler_t/ class=md-nav__link> <span class=md-ellipsis> cbor_tag_handler_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/cend/ class=md-nav__link> <span class=md-ellipsis> cend </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/clear/ class=md-nav__link> <span class=md-ellipsis> clear </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/contains/ class=md-nav__link> <span class=md-ellipsis> contains </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/count/ class=md-nav__link> <span class=md-ellipsis> count </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/crbegin/ class=md-nav__link> <span class=md-ellipsis> crbegin </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/crend/ class=md-nav__link> <span class=md-ellipsis> crend </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/default_object_comparator_t/ class=md-nav__link> <span class=md-ellipsis> default_object_comparator_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/diff/ class=md-nav__link> <span class=md-ellipsis> diff </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/dump/ class=md-nav__link> <span class=md-ellipsis> dump </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/emplace/ class=md-nav__link> <span class=md-ellipsis> emplace </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/emplace_back/ class=md-nav__link> <span class=md-ellipsis> emplace_back </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/empty/ class=md-nav__link> <span class=md-ellipsis> empty </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/end/ class=md-nav__link> <span class=md-ellipsis> end </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/end_pos/ class=md-nav__link> <span class=md-ellipsis> end_pos </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/erase/ class=md-nav__link> <span class=md-ellipsis> erase </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/error_handler_t/ class=md-nav__link> <span class=md-ellipsis> error_handler_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/exception/ class=md-nav__link> <span class=md-ellipsis> exception </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/find/ class=md-nav__link> <span class=md-ellipsis> find </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/flatten/ class=md-nav__link> <span class=md-ellipsis> flatten </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/format_as/ class=md-nav__link> <span class=md-ellipsis> format_as </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_bjdata/ class=md-nav__link> <span class=md-ellipsis> from_bjdata </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_bon8/ class=md-nav__link> <span class=md-ellipsis> from_bon8 </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_bson/ class=md-nav__link> <span class=md-ellipsis> from_bson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_cbor/ class=md-nav__link> <span class=md-ellipsis> from_cbor </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_msgpack/ class=md-nav__link> <span class=md-ellipsis> from_msgpack </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/from_ubjson/ class=md-nav__link> <span class=md-ellipsis> from_ubjson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/front/ class=md-nav__link> <span class=md-ellipsis> front </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get/ class=md-nav__link> <span class=md-ellipsis> get </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get_allocator/ class=md-nav__link> <span class=md-ellipsis> get_allocator </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get_binary/ class=md-nav__link> <span class=md-ellipsis> get_binary </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get_ptr/ class=md-nav__link> <span class=md-ellipsis> get_ptr </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get_ref/ class=md-nav__link> <span class=md-ellipsis> get_ref </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/get_to/ class=md-nav__link> <span class=md-ellipsis> get_to </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/std_formatter/ class=md-nav__link> <span class=md-ellipsis> std::formatter<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/std_hash/ class=md-nav__link> <span class=md-ellipsis> std::hash<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/input_format_t/ class=md-nav__link> <span class=md-ellipsis> input_format_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/insert/ class=md-nav__link> <span class=md-ellipsis> insert </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/invalid_iterator/ class=md-nav__link> <span class=md-ellipsis> invalid_iterator </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_array/ class=md-nav__link> <span class=md-ellipsis> is_array </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_binary/ class=md-nav__link> <span class=md-ellipsis> is_binary </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_boolean/ class=md-nav__link> <span class=md-ellipsis> is_boolean </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_discarded/ class=md-nav__link> <span class=md-ellipsis> is_discarded </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_null/ class=md-nav__link> <span class=md-ellipsis> is_null </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number/ class=md-nav__link> <span class=md-ellipsis> is_number </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_float/ class=md-nav__link> <span class=md-ellipsis> is_number_float </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_integer/ class=md-nav__link> <span class=md-ellipsis> is_number_integer </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_unsigned/ class=md-nav__link> <span class=md-ellipsis> is_number_unsigned </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_object/ class=md-nav__link> <span class=md-ellipsis> is_object </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_primitive/ class=md-nav__link> <span class=md-ellipsis> is_primitive </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_string/ class=md-nav__link> <span class=md-ellipsis> is_string </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_structured/ class=md-nav__link> <span class=md-ellipsis> is_structured </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/items/ class=md-nav__link> <span class=md-ellipsis> items </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/json_base_class_t/ class=md-nav__link> <span class=md-ellipsis> json_base_class_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/json_serializer/ class=md-nav__link> <span class=md-ellipsis> json_serializer </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/max_size/ class=md-nav__link> <span class=md-ellipsis> max_size </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/meta/ class=md-nav__link> <span class=md-ellipsis> meta </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/merge_patch/ class=md-nav__link> <span class=md-ellipsis> merge_patch </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/number_float_t/ class=md-nav__link> <span class=md-ellipsis> number_float_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/number_integer_t/ class=md-nav__link> <span class=md-ellipsis> number_integer_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/number_unsigned_t/ class=md-nav__link> <span class=md-ellipsis> number_unsigned_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/object/ class=md-nav__link> <span class=md-ellipsis> object </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/object_comparator_t/ class=md-nav__link> <span class=md-ellipsis> object_comparator_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/object_t/ class=md-nav__link> <span class=md-ellipsis> object_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_ValueType/ class=md-nav__link> <span class=md-ellipsis> operator ValueType </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_value_t/ class=md-nav__link> <span class=md-ellipsis> operator value_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator%5B%5D/ class=md-nav__link> <span class=md-ellipsis> operator[] </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator%3D/ class=md-nav__link> <span class=md-ellipsis> operator= </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator%2B%3D/ class=md-nav__link> <span class=md-ellipsis> operator+= </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_lt/ class=md-nav__link> <span class=md-ellipsis> operator< </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_gt/ class=md-nav__link> <span class=md-ellipsis> operator> </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_le/ class=md-nav__link> <span class=md-ellipsis> operator<= </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_ge/ class=md-nav__link> <span class=md-ellipsis> operator>= </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/operator_spaceship/ class=md-nav__link> <span class=md-ellipsis> operator<=> </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/out_of_range/ class=md-nav__link> <span class=md-ellipsis> out_of_range </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/other_error/ class=md-nav__link> <span class=md-ellipsis> other_error </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/parse/ class=md-nav__link> <span class=md-ellipsis> parse </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/parse_error/ class=md-nav__link> <span class=md-ellipsis> parse_error </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/parse_event_t/ class=md-nav__link> <span class=md-ellipsis> parse_event_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/parser_callback_t/ class=md-nav__link> <span class=md-ellipsis> parser_callback_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/patch/ class=md-nav__link> <span class=md-ellipsis> patch </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/patch_inplace/ class=md-nav__link> <span class=md-ellipsis> patch_inplace </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/push_back/ class=md-nav__link> <span class=md-ellipsis> push_back </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/rbegin/ class=md-nav__link> <span class=md-ellipsis> rbegin </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/rend/ class=md-nav__link> <span class=md-ellipsis> rend </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/sax_parse/ class=md-nav__link> <span class=md-ellipsis> sax_parse </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/size/ class=md-nav__link> <span class=md-ellipsis> size </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/start_pos/ class=md-nav__link> <span class=md-ellipsis> start_pos </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/string_t/ class=md-nav__link> <span class=md-ellipsis> string_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/swap/ class=md-nav__link> <span class=md-ellipsis> swap </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/std_swap/ class=md-nav__link> <span class=md-ellipsis> std::swap<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bjdata/ class=md-nav__link> <span class=md-ellipsis> to_bjdata </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bon8/ class=md-nav__link> <span class=md-ellipsis> to_bon8 </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bson/ class=md-nav__link> <span class=md-ellipsis> to_bson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_cbor/ class=md-nav__link> <span class=md-ellipsis> to_cbor </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_msgpack/ class=md-nav__link> <span class=md-ellipsis> to_msgpack </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_string/ class=md-nav__link> <span class=md-ellipsis> to_string </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_ubjson/ class=md-nav__link> <span class=md-ellipsis> to_ubjson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type/ class=md-nav__link> <span class=md-ellipsis> type </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type_error/ class=md-nav__link> <span class=md-ellipsis> type_error </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type_name/ class=md-nav__link> <span class=md-ellipsis> type_name </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/unflatten/ class=md-nav__link> <span class=md-ellipsis> unflatten </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/update/ class=md-nav__link> <span class=md-ellipsis> update </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/value/ class=md-nav__link> <span class=md-ellipsis> value </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/value_t/ class=md-nav__link> <span class=md-ellipsis> value_t </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_2> <div class="md-nav__link md-nav__container"> <a href=../../api/byte_container_with_subtype/ class="md-nav__link "> <span class=md-ellipsis> byte_container_with_subtype </span> </a> <label class="md-nav__link " for=__nav_4_2 id=__nav_4_2_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_2_label aria-expanded=false> <label class=md-nav__title for=__nav_4_2> <span class="md-nav__icon md-icon"></span> byte_container_with_subtype </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/byte_container_with_subtype/ class=md-nav__link> <span class=md-ellipsis> (constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/clear_subtype/ class=md-nav__link> <span class=md-ellipsis> clear_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/has_subtype/ class=md-nav__link> <span class=md-ellipsis> has_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/set_subtype/ class=md-nav__link> <span class=md-ellipsis> set_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../api/byte_container_with_subtype/subtype/ class=md-nav__link> <span class=md-ellipsis> subtype </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_3> <div class="md-nav__link md-nav__container"> <a href=../../api/adl_serializer/ class="md-nav__link "> <span class=md-ellipsis> adl_serializer </span> </a> <label class="md-nav__link " for=__nav_4_3 id=__nav_4_3_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_3_label aria-expanded=false> <label class=md-nav__title for=__nav_4_3> <span class="md-nav__icon md-icon"></span> adl_serializer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/adl_serializer/from_json/ class=md-nav__link> <span class=md-ellipsis> from_json </span> </a> </li> <li class=md-nav__item> <a href=../../api/adl_serializer/to_json/ class=md-nav__link> <span class=md-ellipsis> to_json </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../api/json/ class=md-nav__link> <span class=md-ellipsis> json </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_5> <div class="md-nav__link md-nav__container"> <a href=../../api/json_pointer/ class="md-nav__link "> <span class=md-ellipsis> json_pointer </span> </a> <label class="md-nav__link " for=__nav_4_5 id=__nav_4_5_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_5_label aria-expanded=false> <label class=md-nav__title for=__nav_4_5> <span class="md-nav__icon md-icon"></span> json_pointer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/json_pointer/json_pointer/ class=md-nav__link> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/back/ class=md-nav__link> <span class=md-ellipsis> back </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/empty/ class=md-nav__link> <span class=md-ellipsis> empty </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/front/ class=md-nav__link> <span class=md-ellipsis> front </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_string_t/ class=md-nav__link> <span class=md-ellipsis> operator string_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_spaceship/ class=md-nav__link> <span class=md-ellipsis> operator<=> </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_slash/ class=md-nav__link> <span class=md-ellipsis> operator/ </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/operator_slasheq/ class=md-nav__link> <span class=md-ellipsis> operator/= </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/parent_pointer/ class=md-nav__link> <span class=md-ellipsis> parent_pointer </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/pop_back/ class=md-nav__link> <span class=md-ellipsis> pop_back </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/pop_front/ class=md-nav__link> <span class=md-ellipsis> pop_front </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/push_back/ class=md-nav__link> <span class=md-ellipsis> push_back </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/push_front/ class=md-nav__link> <span class=md-ellipsis> push_front </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/string_t/ class=md-nav__link> <span class=md-ellipsis> string_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_pointer/to_string/ class=md-nav__link> <span class=md-ellipsis> to_string </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_6> <div class="md-nav__link md-nav__container"> <a href=../../api/json_sax/ class="md-nav__link "> <span class=md-ellipsis> json_sax </span> </a> <label class="md-nav__link " for=__nav_4_6 id=__nav_4_6_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_6_label aria-expanded=false> <label class=md-nav__title for=__nav_4_6> <span class="md-nav__icon md-icon"></span> json_sax </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/json_sax/binary/ class=md-nav__link> <span class=md-ellipsis> binary </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/boolean/ class=md-nav__link> <span class=md-ellipsis> boolean </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/end_array/ class=md-nav__link> <span class=md-ellipsis> end_array </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/end_object/ class=md-nav__link> <span class=md-ellipsis> end_object </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/key/ class=md-nav__link> <span class=md-ellipsis> key </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/null/ class=md-nav__link> <span class=md-ellipsis> null </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/number_float/ class=md-nav__link> <span class=md-ellipsis> number_float </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/number_integer/ class=md-nav__link> <span class=md-ellipsis> number_integer </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/number_unsigned/ class=md-nav__link> <span class=md-ellipsis> number_unsigned </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/parse_error/ class=md-nav__link> <span class=md-ellipsis> parse_error </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/start_array/ class=md-nav__link> <span class=md-ellipsis> start_array </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/start_object/ class=md-nav__link> <span class=md-ellipsis> start_object </span> </a> </li> <li class=md-nav__item> <a href=../../api/json_sax/string/ class=md-nav__link> <span class=md-ellipsis> string </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../api/operator_ltlt/ class=md-nav__link> <span class=md-ellipsis> operator<<(basic_json), operator<<(json_pointer) </span> </a> </li> <li class=md-nav__item> <a href=../../api/operator_gtgt/ class=md-nav__link> <span class=md-ellipsis> operator>>(basic_json) </span> </a> </li> <li class=md-nav__item> <a href=../../api/operator_literal_json/ class=md-nav__link> <span class=md-ellipsis> operator""_json </span> </a> </li> <li class=md-nav__item> <a href=../../api/operator_literal_json_pointer/ class=md-nav__link> <span class=md-ellipsis> operator""_json_pointer </span> </a> </li> <li class=md-nav__item> <a href=../../api/ordered_json/ class=md-nav__link> <span class=md-ellipsis> ordered_json </span> </a> </li> <li class=md-nav__item> <a href=../../api/ordered_map/ class=md-nav__link> <span class=md-ellipsis> ordered_map </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_13> <div class="md-nav__link md-nav__container"> <a href=../../api/macros/ class="md-nav__link "> <span class=md-ellipsis> macros </span> </a> <label class="md-nav__link " for=__nav_4_13 id=__nav_4_13_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_13_label aria-expanded=false> <label class=md-nav__title for=__nav_4_13> <span class="md-nav__icon md-icon"></span> macros </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../api/macros/json_assert/ class=md-nav__link> <span class=md-ellipsis> JSON_ASSERT </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_brace_init_copy_semantics/ class=md-nav__link> <span class=md-ellipsis> JSON_BRACE_INIT_COPY_SEMANTICS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_throw_user/ class=md-nav__link> <span class=md-ellipsis> JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_diagnostics/ class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTICS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_delete_deprecated_functions/ class=md-nav__link> <span class=md-ellipsis> JSON_DELETE_DEPRECATED_FUNCTIONS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_diagnostic_positions/ class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTIC_POSITIONS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_disable_enum_serialization/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_ENUM_SERIALIZATION </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_disable_tuple_reference_conversion/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_TUPLE_REFERENCE_CONVERSION </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_cpp_11/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20, JSON_HAS_CPP_23, JSON_HAS_CPP_26 </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_filesystem/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_EXPERIMENTAL_FILESYSTEM, JSON_HAS_FILESYSTEM </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_ranges/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_RANGES </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_static_rtti/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_STATIC_RTTI </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_std_format/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_STD_FORMAT </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_has_three_way_comparison/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_THREE_WAY_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_no_automatic_udls/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_AUTOMATIC_UDLS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_noexception/ class=md-nav__link> <span class=md-ellipsis> JSON_NOEXCEPTION </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_no_io/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_IO </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_no_thread_local/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_THREAD_LOCAL </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_precise_stream_position/ class=md-nav__link> <span class=md-ellipsis> JSON_PRECISE_STREAM_POSITION </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_skip_library_version_check/ class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_LIBRARY_VERSION_CHECK </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_skip_unsupported_compiler_check/ class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_UNSUPPORTED_COMPILER_CHECK </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_strict_binary_utf8/ class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_BINARY_UTF8 </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_strict_nul_handling/ class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_NUL_HANDLING </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_use_global_udls/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_GLOBAL_UDLS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_use_implicit_conversions/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_IMPLICIT_CONVERSIONS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_use_legacy_discarded_value_comparison/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_use_objects_for_enum_keyed_maps/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/json_use_simdutf/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_SIMDUTF </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_define_derived_type/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_define_type_intrusive/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_define_type_non_intrusive/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_define_type_with_names/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_namespace/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_namespace_begin/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_namespace_no_version/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE_NO_VERSION </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_serialize_enum/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_serialize_enum_strict/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM_STRICT </span> </a> </li> <li class=md-nav__item> <a href=../../api/macros/nlohmann_json_version_major/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_5> <div class="md-nav__link md-nav__container"> <a href=../../community/ class="md-nav__link "> <span class=md-ellipsis> Community </span> </a> <label class="md-nav__link " for=__nav_5 id=__nav_5_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_5_label aria-expanded=false> <label class=md-nav__title for=__nav_5> <span class="md-nav__icon md-icon"></span> Community </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../community/ecosystem/ class=md-nav__link> <span class=md-ellipsis> Ecosystem </span> </a> </li> <li class=md-nav__item> <a href=../../community/code_of_conduct/ class=md-nav__link> <span class=md-ellipsis> Code of Conduct </span> </a> </li> <li class=md-nav__item> <a href=../../community/contribution_guidelines/ class=md-nav__link> <span class=md-ellipsis> Contribution Guidelines </span> </a> </li> <li class=md-nav__item> <a href=../../community/quality_assurance/ class=md-nav__link> <span class=md-ellipsis> Quality assurance </span> </a> </li> <li class=md-nav__item> <a href=../../community/governance/ class=md-nav__link> <span class=md-ellipsis> Governance </span> </a> </li> <li class=md-nav__item> <a href=../../community/roadmap/ class=md-nav__link> <span class=md-ellipsis> Roadmap </span> </a> </li> <li class=md-nav__item> <a href=../../community/security_policy/ class=md-nav__link> <span class=md-ellipsis> Security Policy </span> </a> </li> <li class=md-nav__item> <a href=../../community/assurance_case/ class=md-nav__link> <span class=md-ellipsis> Assurance case </span> </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#json_assertx class=md-nav__link> <span class=md-ellipsis> JSON_ASSERT(x) </span> </a> </li> <li class=md-nav__item> <a href=#json_brace_init_copy_semantics class=md-nav__link> <span class=md-ellipsis> JSON_BRACE_INIT_COPY_SEMANTICS </span> </a> </li> <li class=md-nav__item> <a href=#json_catch_userexception class=md-nav__link> <span class=md-ellipsis> JSON_CATCH_USER(exception) </span> </a> </li> <li class=md-nav__item> <a href=#json_delete_deprecated_functions class=md-nav__link> <span class=md-ellipsis> JSON_DELETE_DEPRECATED_FUNCTIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_diagnostics class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTICS </span> </a> </li> <li class=md-nav__item> <a href=#json_diagnostic_positions class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTIC_POSITIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20-json_has_cpp_23-json_has_cpp_26 class=md-nav__link> <span class=md-ellipsis> JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20, JSON_HAS_CPP_23, JSON_HAS_CPP_26 </span> </a> </li> <li class=md-nav__item> <a href=#json_has_filesystem-json_has_experimental_filesystem class=md-nav__link> <span class=md-ellipsis> JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM </span> </a> </li> <li class=md-nav__item> <a href=#json_noexception class=md-nav__link> <span class=md-ellipsis> JSON_NOEXCEPTION </span> </a> </li> <li class=md-nav__item> <a href=#json_disable_enum_serialization class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_ENUM_SERIALIZATION </span> </a> </li> <li class=md-nav__item> <a href=#json_disable_tuple_reference_conversion class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_TUPLE_REFERENCE_CONVERSION </span> </a> </li> <li class=md-nav__item> <a href=#json_no_automatic_udls class=md-nav__link> <span class=md-ellipsis> JSON_NO_AUTOMATIC_UDLS </span> </a> </li> <li class=md-nav__item> <a href=#json_no_io class=md-nav__link> <span class=md-ellipsis> JSON_NO_IO </span> </a> </li> <li class=md-nav__item> <a href=#json_no_thread_local class=md-nav__link> <span class=md-ellipsis> JSON_NO_THREAD_LOCAL </span> </a> </li> <li class=md-nav__item> <a href=#json_precise_stream_position class=md-nav__link> <span class=md-ellipsis> JSON_PRECISE_STREAM_POSITION </span> </a> </li> <li class=md-nav__item> <a href=#json_skip_library_version_check class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_LIBRARY_VERSION_CHECK </span> </a> </li> <li class=md-nav__item> <a href=#json_skip_unsupported_compiler_check class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_UNSUPPORTED_COMPILER_CHECK </span> </a> </li> <li class=md-nav__item> <a href=#json_strict_binary_utf8 class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_BINARY_UTF8 </span> </a> </li> <li class=md-nav__item> <a href=#json_strict_nul_handling class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_NUL_HANDLING </span> </a> </li> <li class=md-nav__item> <a href=#json_throw_userexception class=md-nav__link> <span class=md-ellipsis> JSON_THROW_USER(exception) </span> </a> </li> <li class=md-nav__item> <a href=#json_try_user class=md-nav__link> <span class=md-ellipsis> JSON_TRY_USER </span> </a> </li> <li class=md-nav__item> <a href=#json_use_implicit_conversions class=md-nav__link> <span class=md-ellipsis> JSON_USE_IMPLICIT_CONVERSIONS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_global_udls class=md-nav__link> <span class=md-ellipsis> JSON_USE_GLOBAL_UDLS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_legacy_discarded_value_comparison class=md-nav__link> <span class=md-ellipsis> JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=#json_use_objects_for_enum_keyed_maps class=md-nav__link> <span class=md-ellipsis> JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS </span> </a> </li> <li class=md-nav__item> <a href=#json_use_simdutf class=md-nav__link> <span class=md-ellipsis> JSON_USE_SIMDUTF </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_define_type_-nlohmann_define_derived_type_ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...) </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_namespace-nlohmann_json_namespace_begin-nlohmann_json_namespace_end-nlohmann_json_namespace_no_version class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE, NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END, NLOHMANN_JSON_NAMESPACE_NO_VERSION </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_serialize_enumtype class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM(type, ...) </span> </a> </li> <li class=md-nav__item> <a href=#nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH </span> </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <a href="https://github.com/nlohmann/json/edit/develop/docs/mkdocs/docs/features/macros.md" title="Edit this page" class="md-content__button md-icon" rel="edit"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg> </a> <a href="https://github.com/nlohmann/json/raw/develop/docs/mkdocs/docs/features/macros.md" title="View source of this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg> </a> <h1 id=supported-macros>Supported Macros<a class=headerlink href=#supported-macros title="Permanent link">¶</a></h1> <p>Some aspects of the library can be configured by defining preprocessor macros before including the <code>json.hpp</code> header. See also the <a href=../../api/macros/ ><abbr title="Application Programming Interfaces">API</abbr> documentation for macros</a> for examples and more information.</p> <h2 id=json_assertx><code>JSON_ASSERT(x)</code><a class=headerlink href=#json_assertx title="Permanent link">¶</a></h2> <p>This macro controls which code is executed for <a href=../assertions/ >runtime assertions</a> of the library.</p> <p>See <a href=../../api/macros/json_assert/ >full documentation of <code>JSON_ASSERT(x)</code></a>.</p> <h2 id=json_brace_init_copy_semantics><code>JSON_BRACE_INIT_COPY_SEMANTICS</code><a class=headerlink href=#json_brace_init_copy_semantics title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, single-element brace initialization of a <code>basic_json</code> value (e.g., <code class=highlight><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>{</span><span class=n>value</span><span class=p>};</span></code>) is treated as a copy/move of the element rather than wrapping it in a single-element array. The default value is <code>0</code>, which preserves the existing behavior.</p> <p>See <a href=../../api/macros/json_brace_init_copy_semantics/ >full documentation of <code>JSON_BRACE_INIT_COPY_SEMANTICS</code></a>.</p> <h2 id=json_catch_userexception><code>JSON_CATCH_USER(exception)</code><a class=headerlink href=#json_catch_userexception title="Permanent link">¶</a></h2> <p>This macro overrides <a href="https://en.cppreference.com/w/cpp/language/try_catch"><code class=highlight><span class=k>catch</span></code></a> calls inside the library.</p> <p>See <a href=../../api/macros/json_throw_user/ >full documentation of <code>JSON_CATCH_USER(exception)</code></a>.</p> <h2 id=json_delete_deprecated_functions><code>JSON_DELETE_DEPRECATED_FUNCTIONS</code><a class=headerlink href=#json_delete_deprecated_functions title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, all deprecated functions are declared as deleted instead of only being marked as deprecated, so code that still calls them no longer compiles. This way, you can find all calls that need to be replaced before version 4.0.0 removes these functions.</p> <p>The macro can also be set with the CMake option <a href=../../integration/cmake/#json_deletedeprecatedfunctions><code>JSON_DeleteDeprecatedFunctions</code></a> (<code>OFF</code> by default).</p> <p>See <a href=../../api/macros/json_delete_deprecated_functions/ >full documentation of <code>JSON_DELETE_DEPRECATED_FUNCTIONS</code></a>.</p> <h2 id=json_diagnostics><code>JSON_DIAGNOSTICS</code><a class=headerlink href=#json_diagnostics title="Permanent link">¶</a></h2> <p>This macro enables extended diagnostics for exception messages. Possible values are <code>1</code> to enable or <code>0</code> to disable (default).</p> <p>When enabled, exception messages contain a <a href=../json_pointer/ ><abbr title="JavaScript Object Notation">JSON</abbr> Pointer</a> to the <abbr title="JavaScript Object Notation">JSON</abbr> value that triggered the exception, see <a href=../../home/exceptions/#extended-diagnostic-messages>Extended diagnostic messages</a> for an example. Note that enabling this macro increases the size of every <abbr title="JavaScript Object Notation">JSON</abbr> value by one pointer and adds some runtime overhead.</p> <p>The diagnostics messages can also be controlled with the CMake option <a href=../../integration/cmake/#json_diagnostics><code>JSON_Diagnostics</code></a> (<code>OFF</code> by default) which sets <code>JSON_DIAGNOSTICS</code> accordingly.</p> <p>See <a href=../../api/macros/json_diagnostics/ >full documentation of <code>JSON_DIAGNOSTICS</code></a>.</p> <h2 id=json_diagnostic_positions><code>JSON_DIAGNOSTIC_POSITIONS</code><a class=headerlink href=#json_diagnostic_positions title="Permanent link">¶</a></h2> <p>When enabled, two new member functions <a href=../../api/basic_json/start_pos/ ><code>start_pos()</code></a> and <a href=../../api/basic_json/end_pos/ ><code>end_pos()</code></a> are added to <a href=../../api/basic_json/ ><code>basic_json</code></a> values. If the value was created by calling the<a href=../../api/basic_json/parse/ ><code>parse</code></a> function, then these functions allow querying the byte positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate errors.</p> <p>The diagnostics positions can also be controlled with the CMake option <a href=../../integration/cmake/#json_diagnostic_positions><code>JSON_Diagnostic_Positions</code></a> (<code>OFF</code> by default) which sets <code>JSON_DIAGNOSTIC_POSITIONS</code> accordingly.</p> <p>See <a href=../../api/macros/json_diagnostic_positions/ >full documentation of <code>JSON_DIAGNOSTIC_POSITIONS</code></a></p> <h2 id=json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20-json_has_cpp_23-json_has_cpp_26><code>JSON_HAS_CPP_11</code>, <code>JSON_HAS_CPP_14</code>, <code>JSON_HAS_CPP_17</code>, <code>JSON_HAS_CPP_20</code>, <code>JSON_HAS_CPP_23</code>, <code>JSON_HAS_CPP_26</code><a class=headerlink href=#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20-json_has_cpp_23-json_has_cpp_26 title="Permanent link">¶</a></h2> <p>The library targets C++11, but also supports some features introduced in later C++ versions (e.g., <code>std::string_view</code> support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.</p> <p>See <a href=../../api/macros/json_has_cpp_11/ >full documentation of <code>JSON_HAS_CPP_11</code>, <code>JSON_HAS_CPP_14</code>, <code>JSON_HAS_CPP_17</code>, <code>JSON_HAS_CPP_20</code>, <code>JSON_HAS_CPP_23</code>, and <code>JSON_HAS_CPP_26</code></a>.</p> <h2 id=json_has_filesystem-json_has_experimental_filesystem><code>JSON_HAS_FILESYSTEM</code>, <code>JSON_HAS_EXPERIMENTAL_FILESYSTEM</code><a class=headerlink href=#json_has_filesystem-json_has_experimental_filesystem title="Permanent link">¶</a></h2> <p>When compiling with C++17, the library provides conversions from and to <code>std::filesystem::path</code>. As compiler support for filesystem is limited, the library tries to detect whether <code><filesystem></code>/<code>std::filesystem</code> (<code>JSON_HAS_FILESYSTEM</code>) or <code><experimental/filesystem></code>/<code>std::experimental::filesystem</code> (<code>JSON_HAS_EXPERIMENTAL_FILESYSTEM</code>) should be used. To override the built-in check, define <code>JSON_HAS_FILESYSTEM</code> or <code>JSON_HAS_EXPERIMENTAL_FILESYSTEM</code> to <code>1</code>.</p> <p>See <a href=../../api/macros/json_has_filesystem/ >full documentation of <code>JSON_HAS_FILESYSTEM</code> and <code>JSON_HAS_EXPERIMENTAL_FILESYSTEM</code></a>.</p> <h2 id=json_noexception><code>JSON_NOEXCEPTION</code><a class=headerlink href=#json_noexception title="Permanent link">¶</a></h2> <p>Exceptions can be switched off by defining the symbol <code>JSON_NOEXCEPTION</code>.</p> <p>See <a href=../../api/macros/json_noexception/ >full documentation of <code>JSON_NOEXCEPTION</code></a>.</p> <h2 id=json_disable_enum_serialization><code>JSON_DISABLE_ENUM_SERIALIZATION</code><a class=headerlink href=#json_disable_enum_serialization title="Permanent link">¶</a></h2> <p>When defined, default parse and serialize functions for enums are excluded and have to be provided by the user, for example, using <a href=../../api/macros/nlohmann_json_serialize_enum/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM</code></a>.</p> <p>See <a href=../../api/macros/json_disable_enum_serialization/ >full documentation of <code>JSON_DISABLE_ENUM_SERIALIZATION</code></a>.</p> <h2 id=json_disable_tuple_reference_conversion><code>JSON_DISABLE_TUPLE_REFERENCE_CONVERSION</code><a class=headerlink href=#json_disable_tuple_reference_conversion title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, a <abbr title="JavaScript Object Notation">JSON</abbr> value can no longer be created from a one-element <code>std::tuple</code> holding a reference to a <abbr title="JavaScript Object Notation">JSON</abbr> value, such as the result of <code>std::forward_as_tuple(j)</code>. This lets <code>std::tuple</code> convert such tuples element-wise. This is planned to become the default in version 4.0.0.</p> <p>See <a href=../../api/macros/json_disable_tuple_reference_conversion/ >full documentation of <code>JSON_DISABLE_TUPLE_REFERENCE_CONVERSION</code></a>.</p> <h2 id=json_no_automatic_udls><code>JSON_NO_AUTOMATIC_UDLS</code><a class=headerlink href=#json_no_automatic_udls title="Permanent link">¶</a></h2> <p>When defined, <code><nlohmann/json.hpp></code> does not include <code><nlohmann/json_literals.hpp></code> with the user-defined string literals <code>operator""_json</code> and <code>operator""_json_pointer</code>. This reduces the compile time of translation units that do not use them, because the literals instantiate the parser in every translation unit that includes them. Include <code><nlohmann/json_literals.hpp></code> where the literals are needed.</p> <p>See <a href=../../api/macros/json_no_automatic_udls/ >full documentation of <code>JSON_NO_AUTOMATIC_UDLS</code></a>.</p> <h2 id=json_no_io><code>JSON_NO_IO</code><a class=headerlink href=#json_no_io title="Permanent link">¶</a></h2> <p>When defined, headers <code><cstdio></code>, <code><ios></code>, <code><iosfwd></code>, <code><istream></code>, and <code><ostream></code> are not included and parse functions relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).</p> <p>See <a href=../../api/macros/json_no_io/ >full documentation of <code>JSON_NO_IO</code></a>.</p> <h2 id=json_no_thread_local><code>JSON_NO_THREAD_LOCAL</code><a class=headerlink href=#json_no_thread_local title="Permanent link">¶</a></h2> <p>When defined, the library does not use <code class=highlight><span class=k>thread_local</span></code> storage. Copying a value and comparing two values then always avoid the call stack rather than descending into a bounded number of levels first, which is slower but yields the same values and the same comparisons.</p> <p>See <a href=../../api/macros/json_no_thread_local/ >full documentation of <code>JSON_NO_THREAD_LOCAL</code></a>.</p> <h2 id=json_precise_stream_position><code>JSON_PRECISE_STREAM_POSITION</code><a class=headerlink href=#json_precise_stream_position title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, <a href=../../api/operator_gtgt/ ><code>operator>></code></a> and non-strict <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a> leave an input stream positioned right after the parsed value, instead of also consuming the character that terminates a number. The default value is <code>0</code>, which preserves the existing behavior; this is planned to become the default in version 4.0.0.</p> <p>See <a href=../../api/macros/json_precise_stream_position/ >full documentation of <code>JSON_PRECISE_STREAM_POSITION</code></a>.</p> <h2 id=json_skip_library_version_check><code>JSON_SKIP_LIBRARY_VERSION_CHECK</code><a class=headerlink href=#json_skip_library_version_check title="Permanent link">¶</a></h2> <p>When defined, the library will not create a compiler warning when a different version of the library was already included.</p> <p>See <a href=../../api/macros/json_skip_library_version_check/ >full documentation of <code>JSON_SKIP_LIBRARY_VERSION_CHECK</code></a>.</p> <h2 id=json_skip_unsupported_compiler_check><code>JSON_SKIP_UNSUPPORTED_COMPILER_CHECK</code><a class=headerlink href=#json_skip_unsupported_compiler_check title="Permanent link">¶</a></h2> <p>When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.</p> <p>See <a href=../../api/macros/json_skip_unsupported_compiler_check/ >full documentation of <code>JSON_SKIP_UNSUPPORTED_COMPILER_CHECK</code></a>.</p> <h2 id=json_strict_binary_utf8><code>JSON_STRICT_BINARY_UTF8</code><a class=headerlink href=#json_strict_binary_utf8 title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, <a href=../../api/basic_json/to_cbor/ ><code>to_cbor</code></a>, <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a>, <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata</code></a>, and <a href=../../api/basic_json/to_bson/ ><code>to_bson</code></a> throw <a href=../../home/exceptions/#jsonexceptiontype_error316><code>type_error.316</code></a> for a string value or object key that is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8. The default value is <code>0</code>, which writes the bytes unchanged as before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>; this is planned to become the default in version 4.0.0.</p> <p>The check can also be enabled with the CMake option <a href=../../integration/cmake/#json_strictbinaryutf8><code>JSON_StrictBinaryUTF8</code></a> (<code>OFF</code> by default) which sets <code>JSON_STRICT_BINARY_UTF8</code> accordingly.</p> <p>See <a href=../../api/macros/json_strict_binary_utf8/ >full documentation of <code>JSON_STRICT_BINARY_UTF8</code></a>.</p> <h2 id=json_strict_nul_handling><code>JSON_STRICT_NUL_HANDLING</code><a class=headerlink href=#json_strict_nul_handling title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, a <code>'\0'</code> (NUL) byte anywhere in the input is rejected with <code>parse_error.101</code>, like any other unexpected byte, instead of being silently treated as end of input (see the <a href=../../home/faq/#nul-bytes-in-the-input><abbr title="Frequently Asked Questions">FAQ</abbr> entry</a> for background). The default value is <code>0</code>, which preserves the existing behavior; this is planned to become the default in version 4.0.0.</p> <p>The strict handling can also be enabled with the CMake option <a href=../../integration/cmake/#json_strictnulhandling><code>JSON_StrictNulHandling</code></a> (<code>OFF</code> by default) which sets <code>JSON_STRICT_NUL_HANDLING</code> accordingly.</p> <p>See <a href=../../api/macros/json_strict_nul_handling/ >full documentation of <code>JSON_STRICT_NUL_HANDLING</code></a>.</p> <h2 id=json_throw_userexception><code>JSON_THROW_USER(exception)</code><a class=headerlink href=#json_throw_userexception title="Permanent link">¶</a></h2> <p>This macro overrides <code class=highlight><span class=k>throw</span></code> calls inside the library. The argument is the exception to be thrown.</p> <p>See <a href=../../api/macros/json_throw_user/ >full documentation of <code>JSON_THROW_USER(exception)</code></a>.</p> <h2 id=json_try_user><code>JSON_TRY_USER</code><a class=headerlink href=#json_try_user title="Permanent link">¶</a></h2> <p>This macro overrides <code class=highlight><span class=k>try</span></code> calls inside the library.</p> <p>See <a href=../../api/macros/json_throw_user/ >full documentation of <code>JSON_TRY_USER</code></a>.</p> <h2 id=json_use_implicit_conversions><code>JSON_USE_IMPLICIT_CONVERSIONS</code><a class=headerlink href=#json_use_implicit_conversions title="Permanent link">¶</a></h2> <p>When defined to <code>0</code>, implicit conversions are switched off. By default, implicit conversions are switched on.</p> <p>See <a href=../../api/macros/json_use_implicit_conversions/ >full documentation of <code>JSON_USE_IMPLICIT_CONVERSIONS</code></a>.</p> <h2 id=json_use_global_udls><code>JSON_USE_GLOBAL_UDLS</code><a class=headerlink href=#json_use_global_udls title="Permanent link">¶</a></h2> <p>When defined to <code>1</code> (default), the user-defined string literals <code>operator""_json</code> and <code>operator""_json_pointer</code> are placed into the global namespace instead of <code>nlohmann::literals::json_literals</code>.</p> <p>See <a href=../../api/macros/json_use_global_udls/ >full documentation of <code>JSON_USE_GLOBAL_UDLS</code></a>.</p> <h2 id=json_use_legacy_discarded_value_comparison><code>JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON</code><a class=headerlink href=#json_use_legacy_discarded_value_comparison title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, the library restores the legacy behavior in which a discarded value compared equal to itself. This behavior is <a href=../../integration/migration_guide/#miscellaneous-functions>deprecated</a> and switched off (<code>0</code>) by default.</p> <p>See <a href=../../api/macros/json_use_legacy_discarded_value_comparison/ >full documentation of <code>JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON</code></a>.</p> <h2 id=json_use_objects_for_enum_keyed_maps><code>JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS</code><a class=headerlink href=#json_use_objects_for_enum_keyed_maps title="Permanent link">¶</a></h2> <p>When defined to <code>1</code>, maps with enum keys (e.g., <code>std::map<E, T></code>) are stored as objects, using the enum's conversion for the keys, instead of arrays of <code>[key, value]</code> pairs. It is switched off (<code>0</code>) by default.</p> <p>See <a href=../../api/macros/json_use_objects_for_enum_keyed_maps/ >full documentation of <code>JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS</code></a>.</p> <h2 id=json_use_simdutf><code>JSON_USE_SIMDUTF</code><a class=headerlink href=#json_use_simdutf title="Permanent link">¶</a></h2> <p>When defined, <abbr title="Unicode Transformation Format">UTF</abbr>-8 validation of <abbr title="JavaScript Object Notation">JSON</abbr> strings read from contiguous byte input is delegated to the <a href="https://github.com/simdutf/simdutf">simdutf</a> library instead of the built-in scalar validator. This is an opt-in external dependency and is not defined by default.</p> <p>See <a href=../../api/macros/json_use_simdutf/ >full documentation of <code>JSON_USE_SIMDUTF</code></a>.</p> <h2 id=nlohmann_define_type_-nlohmann_define_derived_type_><code>NLOHMANN_DEFINE_TYPE_*(...)</code>, <code>NLOHMANN_DEFINE_DERIVED_TYPE_*(...)</code><a class=headerlink href=#nlohmann_define_type_-nlohmann_define_derived_type_ title="Permanent link">¶</a></h2> <p>The library defines 12 macros to simplify the serialization/deserialization of types. See the page on <a href=../arbitrary_types/#simplify-your-life-with-macros>arbitrary type conversion</a> for a detailed discussion.</p> <h2 id=nlohmann_json_namespace-nlohmann_json_namespace_begin-nlohmann_json_namespace_end-nlohmann_json_namespace_no_version><code>NLOHMANN_JSON_NAMESPACE</code>, <code>NLOHMANN_JSON_NAMESPACE_BEGIN</code>, <code>NLOHMANN_JSON_NAMESPACE_END</code>, <code>NLOHMANN_JSON_NAMESPACE_NO_VERSION</code><a class=headerlink href=#nlohmann_json_namespace-nlohmann_json_namespace_begin-nlohmann_json_namespace_end-nlohmann_json_namespace_no_version title="Permanent link">¶</a></h2> <p>These macros relate to the versioned, inline <code>nlohmann</code> namespace:</p> <ul> <li><code>NLOHMANN_JSON_NAMESPACE</code> evaluates to the full name of the <code>nlohmann</code> namespace (including the inline ABI namespace).</li> <li><code>NLOHMANN_JSON_NAMESPACE_BEGIN</code> / <code>NLOHMANN_JSON_NAMESPACE_END</code> open and close the namespace (for example, to add specializations).</li> <li><code>NLOHMANN_JSON_NAMESPACE_NO_VERSION</code>, when defined to <code>1</code>, omits the version component from the inline namespace.</li> </ul> <p>See the <a href=../namespace/ ><code>nlohmann</code> Namespace</a> page, and the full documentation of <a href=../../api/macros/nlohmann_json_namespace/ ><code>NLOHMANN_JSON_NAMESPACE</code></a>, <a href=../../api/macros/nlohmann_json_namespace_begin/ ><code>NLOHMANN_JSON_NAMESPACE_BEGIN</code> / <code>NLOHMANN_JSON_NAMESPACE_END</code></a>, and <a href=../../api/macros/nlohmann_json_namespace_no_version/ ><code>NLOHMANN_JSON_NAMESPACE_NO_VERSION</code></a>.</p> <h2 id=nlohmann_json_serialize_enumtype><code>NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)</code><a class=headerlink href=#nlohmann_json_serialize_enumtype title="Permanent link">¶</a></h2> <p>This macro simplifies the serialization/deserialization of enum types. See <a href=../enum_conversion/ >Specializing enum conversion</a> for more information.</p> <p>See <a href=../../api/macros/nlohmann_json_serialize_enum/ >full documentation of <code>NLOHMANN_JSON_SERIALIZE_ENUM</code></a>.</p> <p>A strict variant <a href=../../api/macros/nlohmann_json_serialize_enum_strict/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM_STRICT</code></a> throws an exception on undefined input instead of falling back to the first mapping.</p> <h2 id=nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch><code>NLOHMANN_JSON_VERSION_MAJOR</code>, <code>NLOHMANN_JSON_VERSION_MINOR</code>, <code>NLOHMANN_JSON_VERSION_PATCH</code><a class=headerlink href=#nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch title="Permanent link">¶</a></h2> <p>These macros are defined by the library and contain the version numbers according to <a href="https://semver.org/spec/v2.0.0.html">Semantic Versioning 2.0.0</a>.</p> <p>See <a href=../../api/macros/nlohmann_json_version_major/ >full documentation of <code>NLOHMANN_JSON_VERSION_MAJOR</code>, <code>NLOHMANN_JSON_VERSION_MINOR</code>, and <code>NLOHMANN_JSON_VERSION_PATCH</code></a>.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 4, 2026 20:11:34 UTC">October 4, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - 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