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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/integration/compile_times/" rel="canonical"><link href=../pkg-config/ rel=prev><link href=../../api/basic_json/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Compile times - 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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class=md-ellipsis> Binary Values </span> </a> </li> <li class=md-nav__item> <a href=../../features/comments/ class=md-nav__link> <span class=md-ellipsis> Comments </span> </a> </li> <li class=md-nav__item> <a href=../../features/conversions/ class=md-nav__link> <span class=md-ellipsis> Converting values </span> </a> </li> <li class=md-nav__item> <a href=../../features/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=../../features/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=../../features/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=../../features/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=../../features/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=../../features/iterators/ class=md-nav__link> <span class=md-ellipsis> Iterators </span> </a> </li> <li class=md-nav__item> <a href=../../features/merge_patch/ class=md-nav__link> <span class=md-ellipsis> JSON Merge Patch </span> </a> </li> <li class=md-nav__item> <a href=../../features/json_patch/ class=md-nav__link> <span class=md-ellipsis> JSON Patch and Diff </span> </a> </li> <li class=md-nav__item> <a href=../../features/json_pointer/ class=md-nav__link> <span class=md-ellipsis> JSON Pointer </span> </a> </li> <li class=md-nav__item> <a href=../../features/modifying_values/ class=md-nav__link> <span class=md-ellipsis> Modifying values </span> </a> </li> <li class=md-nav__item> <a href=../../features/modules/ class=md-nav__link> <span class=md-ellipsis> Modules </span> </a> </li> <li class=md-nav__item> <a href=../../features/namespace/ class=md-nav__link> <span class=md-ellipsis> nlohmann Namespace </span> </a> </li> <li class=md-nav__item> <a href=../../features/object_order/ class=md-nav__link> <span class=md-ellipsis> Object Order </span> </a> </li> <li class=md-nav__item> <a href=../../features/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=../../features/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=../../features/parsing/json_lines/ class=md-nav__link> <span class=md-ellipsis> JSON Lines </span> </a> </li> <li class=md-nav__item> <a href=../../features/parsing/parse_exceptions/ class=md-nav__link> <span class=md-ellipsis> Parsing and Exceptions </span> </a> </li> <li class=md-nav__item> <a href=../../features/parsing/parser_callbacks/ class=md-nav__link> <span class=md-ellipsis> Parser Callbacks </span> </a> </li> <li class=md-nav__item> <a href=../../features/parsing/sax_interface/ class=md-nav__link> <span class=md-ellipsis> SAX Interface </span> </a> </li> <li class=md-nav__item> <a href=../../features/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=../../features/assertions/ class=md-nav__link> <span class=md-ellipsis> Runtime Assertions </span> </a> </li> <li class=md-nav__item> <a href=../../features/serialization/ class=md-nav__link> <span class=md-ellipsis> Serialization </span> </a> </li> <li class=md-nav__item> <a href=../../features/enum_conversion/ class=md-nav__link> <span class=md-ellipsis> Specializing enum conversion </span> </a> </li> <li class=md-nav__item> <a href=../../features/macros/ class=md-nav__link> <span class=md-ellipsis> Supported Macros </span> </a> </li> <li class=md-nav__item> <a href=../../features/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=../../features/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=../../features/types/number_handling/ class=md-nav__link> <span class=md-ellipsis> Number Handling </span> </a> </li> <li class=md-nav__item> <a href=../../features/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--active md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3 checked> <div class="md-nav__link md-nav__container"> <a href=../ class="md-nav__link "> <span class=md-ellipsis> Integration </span> </a> <label class="md-nav__link " for=__nav_3 id=__nav_3_label tabindex> <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=true> <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=../migration_guide/ class=md-nav__link> <span class=md-ellipsis> Migration Guide </span> </a> </li> <li class=md-nav__item> <a href=../cmake/ class=md-nav__link> <span class=md-ellipsis> CMake </span> </a> </li> <li class=md-nav__item> <a href=../package_managers/ class=md-nav__link> <span class=md-ellipsis> Package Managers </span> </a> </li> <li class=md-nav__item> <a href=../pkg-config/ class=md-nav__link> <span class=md-ellipsis> Pkg-config </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> Compile times </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Compile times </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=#include-json_fwdhpp-in-headers class=md-nav__link> <span class=md-ellipsis> Include json_fwd.hpp in headers </span> </a> </li> <li class=md-nav__item> <a href=#opt-out-of-the-automatic-user-defined-string-literals class=md-nav__link> <span class=md-ellipsis> Opt out of the automatic user-defined string literals </span> </a> </li> <li class=md-nav__item> <a href=#instantiate-basic_json-once class=md-nav__link> <span class=md-ellipsis> Instantiate basic_json once </span> </a> </li> <li class=md-nav__item> <a href=#use-c20-modules class=md-nav__link> <span class=md-ellipsis> Use C++20 modules </span> </a> </li> <li class=md-nav__item> <a href=#use-precompiled-headers class=md-nav__link> <span class=md-ellipsis> Use precompiled headers </span> </a> </li> <li class=md-nav__item> <a href=#options-without-effect-on-compile-times class=md-nav__link> <span class=md-ellipsis> Options without effect on compile times </span> </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> <span class=md-ellipsis> See also </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_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&lt;basic_json&gt; </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&lt;basic_json&gt; </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&lt;basic_json&gt; </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_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> 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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 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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=#include-json_fwdhpp-in-headers class=md-nav__link> <span class=md-ellipsis> Include json_fwd.hpp in headers </span> </a> </li> <li class=md-nav__item> <a href=#opt-out-of-the-automatic-user-defined-string-literals class=md-nav__link> <span class=md-ellipsis> Opt out of the automatic user-defined string literals </span> </a> </li> <li class=md-nav__item> <a href=#instantiate-basic_json-once class=md-nav__link> <span class=md-ellipsis> Instantiate basic_json once </span> </a> </li> <li class=md-nav__item> <a href=#use-c20-modules class=md-nav__link> <span class=md-ellipsis> Use C++20 modules </span> </a> </li> <li class=md-nav__item> <a href=#use-precompiled-headers class=md-nav__link> <span class=md-ellipsis> Use precompiled headers </span> </a> </li> <li class=md-nav__item> <a href=#options-without-effect-on-compile-times class=md-nav__link> <span class=md-ellipsis> Options without effect on compile times </span> </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> <span class=md-ellipsis> See also </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/integration/compile_times.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/integration/compile_times.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=compile-times>Compile times<a class=headerlink href=#compile-times title="Permanent link">&para;</a></h1> <p>The library is header-only and makes heavy use of templates, so every translation unit that includes <code>&lt;nlohmann/json.hpp&gt;</code> pays for parsing the header and instantiating what it uses. This page lists the options to reduce that cost, ordered by how much they typically save.</p> <div class="admonition info"> <p class=admonition-title>Measurements</p> <p>The numbers below are medians of nine runs compiling a single translation unit with <code>-std=c++17 -c</code> against the single-header version, with Apple clang and <abbr title="GNU Compiler Collection">GCC</abbr> 16 on macOS (Apple silicon). They show the order of magnitude to expect; measure your own code before and after a change.</p> </div> <h2 id=include-json_fwdhpp-in-headers>Include <code>json_fwd.hpp</code> in headers<a class=headerlink href=#include-json_fwdhpp-in-headers title="Permanent link">&para;</a></h2> <p>Header files that only need to <em>name</em> the <code>json</code> type — for function declarations, members held by pointer or reference, or friend declarations — can include <code>&lt;nlohmann/json_fwd.hpp&gt;</code> instead of <code>&lt;nlohmann/json.hpp&gt;</code>. It only forward-declares <code>basic_json</code>, <code>json</code>, <code>ordered_json</code>, <code>json_pointer</code>, and <code>adl_serializer</code>. The translation units that actually use the values then include <code>&lt;nlohmann/json.hpp&gt;</code>.</p> <div class=highlight><span class=filename>person.hpp</span><pre><span></span><code><span class=cp>#pragma once</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json_fwd.hpp&gt;</span>
<span class=k>struct</span><span class=w> </span><span class=nc>person</span><span class=p>;</span>
<span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>);</span>
<span class=kt>void</span><span class=w> </span><span class=nf>from_json</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>);</span>
</code></pre></div> <div class=highlight><span class=filename>person.cpp</span><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>"person.hpp"</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span>
<span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>)</span><span class=w> </span><span class=p>{</span><span class=w> </span><span class=cm>/* ... */</span><span class=w> </span><span class=p>}</span>
<span class=kt>void</span><span class=w> </span><span class=nf>from_json</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>)</span><span class=w> </span><span class=p>{</span><span class=w> </span><span class=cm>/* ... */</span><span class=w> </span><span class=p>}</span>
</code></pre></div> <table> <thead> <tr> <th>Compiler</th> <th style="text-align: right;"><code>json.hpp</code> (<code>-O0</code>)</th> <th style="text-align: right;"><code>json_fwd.hpp</code> (<code>-O0</code>)</th> <th style="text-align: right;">Change</th> </tr> </thead> <tbody> <tr> <td>Apple clang</td> <td style="text-align: right;">704 ms</td> <td style="text-align: right;">329 ms</td> <td style="text-align: right;">−53%</td> </tr> <tr> <td><abbr title="GNU Compiler Collection">GCC</abbr> 16</td> <td style="text-align: right;">779 ms</td> <td style="text-align: right;">242 ms</td> <td style="text-align: right;">−69%</td> </tr> </tbody> </table> <p>This is the most effective option, because it avoids the full header in every translation unit that includes <em>your</em> headers.</p> <h2 id=opt-out-of-the-automatic-user-defined-string-literals>Opt out of the automatic user-defined string literals<a class=headerlink href=#opt-out-of-the-automatic-user-defined-string-literals title="Permanent link">&para;</a></h2> <p>The user-defined string literals <a href=../../api/operator_literal_json/ ><code>operator""_json</code></a> and <a href=../../api/operator_literal_json_pointer/ ><code>operator""_json_pointer</code></a> are ordinary inline functions whose bodies call the parser. As <code>&lt;nlohmann/json.hpp&gt;</code> includes them by default, every translation unit instantiates the parser, even if it never parses anything itself.</p> <p>Define <a href=../../api/macros/json_no_automatic_udls/ ><code>JSON_NO_AUTOMATIC_UDLS</code></a> for the whole project and include <code>&lt;nlohmann/json_literals.hpp&gt;</code> instead of <code>&lt;nlohmann/json.hpp&gt;</code> in the files that use the literals (it includes <code>&lt;nlohmann/json.hpp&gt;</code> itself):</p> <div class=highlight><pre><span></span><code><span class=nb>target_compile_definitions</span><span class=p>(</span><span class=s>my_target</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>JSON_NO_AUTOMATIC_UDLS</span><span class=p>)</span>
</code></pre></div> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json_literals.hpp&gt;</span><span class=w> </span><span class=c1>// only where "..."_json is used; includes &lt;nlohmann/json.hpp&gt;</span>
</code></pre></div> <p>The saving applies to translation units that do not parse <abbr title="JavaScript Object Notation">JSON</abbr>, for example ones that define types and their conversions or only pass <code>json</code> values around:</p> <table> <thead> <tr> <th>Compiler</th> <th>Translation unit</th> <th style="text-align: right;">Default (<code>-O0</code> / <code>-O2</code>)</th> <th style="text-align: right;"><code>JSON_NO_AUTOMATIC_UDLS</code> (<code>-O0</code> / <code>-O2</code>)</th> <th style="text-align: right;">Change</th> </tr> </thead> <tbody> <tr> <td>Apple clang</td> <td>model</td> <td style="text-align: right;">776 ms / 846 ms</td> <td style="text-align: right;">629 ms / 692 ms</td> <td style="text-align: right;">−19% / −18%</td> </tr> <tr> <td><abbr title="GNU Compiler Collection">GCC</abbr> 16</td> <td>model</td> <td style="text-align: right;">1022 ms / 1120 ms</td> <td style="text-align: right;">882 ms / 965 ms</td> <td style="text-align: right;">−14% / −14%</td> </tr> <tr> <td>Apple clang</td> <td>parsing</td> <td style="text-align: right;">992 ms / 1815 ms</td> <td style="text-align: right;">1006 ms / 1823 ms</td> <td style="text-align: right;">+1% / 0%</td> </tr> <tr> <td><abbr title="GNU Compiler Collection">GCC</abbr> 16</td> <td>parsing</td> <td style="text-align: right;">2018 ms / 3420 ms</td> <td style="text-align: right;">1990 ms / 3454 ms</td> <td style="text-align: right;">−1% / +1%</td> </tr> </tbody> </table> <p>Translation units that include only the header save up to a third. Translation units that parse anyway instantiate the parser regardless and see no difference.</p> <h2 id=instantiate-basic_json-once>Instantiate <code>basic_json</code> once<a class=headerlink href=#instantiate-basic_json-once title="Permanent link">&para;</a></h2> <p>Each translation unit instantiates the member functions of <code>nlohmann::json</code> it uses. An explicit instantiation declaration tells the compiler that the non-template members are instantiated elsewhere, so it can skip them:</p> <div class=highlight><span class=filename>json_instance.hpp</span><pre><span></span><code><span class=cp>#pragma once</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span>
<span class=k>extern</span><span class=w> </span><span class=k>template</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>nlohmann</span><span class=o>::</span><span class=n>basic_json</span><span class=o>&lt;&gt;</span><span class=p>;</span>
</code></pre></div> <div class=highlight><span class=filename>json_instance.cpp</span><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>"json_instance.hpp"</span>
<span class=k>template</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>nlohmann</span><span class=o>::</span><span class=n>basic_json</span><span class=o>&lt;&gt;</span><span class=p>;</span>
</code></pre></div> <p>Include <code>json_instance.hpp</code> instead of <code>&lt;nlohmann/json.hpp&gt;</code> and compile and link <code>json_instance.cpp</code> once.</p> <table> <thead> <tr> <th>Compiler</th> <th>Translation unit</th> <th style="text-align: right;">Default (<code>-O0</code> / <code>-O2</code>)</th> <th style="text-align: right;"><code>extern template</code> (<code>-O0</code> / <code>-O2</code>)</th> <th style="text-align: right;">Change</th> </tr> </thead> <tbody> <tr> <td>Apple clang</td> <td>parsing</td> <td style="text-align: right;">992 ms / 1815 ms</td> <td style="text-align: right;">953 ms / 1625 ms</td> <td style="text-align: right;">−4% / −10%</td> </tr> <tr> <td><abbr title="GNU Compiler Collection">GCC</abbr> 16</td> <td>parsing</td> <td style="text-align: right;">2018 ms / 3420 ms</td> <td style="text-align: right;">1522 ms / 2728 ms</td> <td style="text-align: right;">−25% / −20%</td> </tr> <tr> <td>Apple clang</td> <td><code>json_instance.cpp</code></td> <td style="text-align: right;">—</td> <td style="text-align: right;">2166 ms / 4660 ms</td> <td style="text-align: right;">—</td> </tr> <tr> <td><abbr title="GNU Compiler Collection">GCC</abbr> 16</td> <td><code>json_instance.cpp</code></td> <td style="text-align: right;">—</td> <td style="text-align: right;">5085 ms / 10616 ms</td> <td style="text-align: right;">—</td> </tr> </tbody> </table> <p>Notes:</p> <ul> <li>The saving grows with the number of translation units that use <code>json</code>, while the instantiation translation unit is compiled only once (and is rarely recompiled, as it does not depend on your code).</li> <li>Member function templates (such as <code>get&lt;T&gt;()</code>, <code>parse(InputType&amp;&amp;)</code>, or <code>value(key, default)</code>) are not covered by the explicit instantiation and are still instantiated where they are used.</li> <li>The declaration covers exactly <code>nlohmann::json</code>. Add the same lines for <code>nlohmann::ordered_json</code> (<code>nlohmann::basic_json&lt;nlohmann::ordered_map&gt;</code>) or your own <code>basic_json</code> specializations if you use them.</li> </ul> <h2 id=use-c20-modules>Use C++20 modules<a class=headerlink href=#use-c20-modules title="Permanent link">&para;</a></h2> <p>With a toolchain that supports named modules, <code>import nlohmann.json;</code> compiles the library once into a module and avoids parsing the header in every translation unit. See <a href=../../features/modules/ >Modules</a> for requirements and known issues. Module support is experimental and currently depends heavily on the compiler version.</p> <h2 id=use-precompiled-headers>Use precompiled headers<a class=headerlink href=#use-precompiled-headers title="Permanent link">&para;</a></h2> <p>Build systems can precompile <code>&lt;nlohmann/json.hpp&gt;</code> together with other stable headers, for example with CMake's <a href="https://cmake.org/cmake/help/latest/command/target_precompile_headers.html"><code>target_precompile_headers</code></a>:</p> <div class=highlight><pre><span></span><code><span class=nb>target_precompile_headers</span><span class=p>(</span><span class=s>my_target</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>&lt;nlohmann/json.hpp&gt;</span><span class=p>)</span>
</code></pre></div> <p>This removes the cost of parsing the header, but not of instantiating templates in each translation unit, so it combines well with the options above.</p> <h2 id=options-without-effect-on-compile-times>Options without effect on compile times<a class=headerlink href=#options-without-effect-on-compile-times title="Permanent link">&para;</a></h2> <p>Some configuration macros change what the library declares, but do not measurably change compile times:</p> <table> <thead> <tr> <th>Macro</th> <th style="text-align: right;">Apple clang, model (<code>-O0</code> / <code>-O2</code>)</th> <th style="text-align: right;"><abbr title="GNU Compiler Collection">GCC</abbr> 16, model (<code>-O0</code> / <code>-O2</code>)</th> </tr> </thead> <tbody> <tr> <td>default</td> <td style="text-align: right;">776 ms / 846 ms</td> <td style="text-align: right;">1022 ms / 1120 ms</td> </tr> <tr> <td><a href=../../api/macros/json_no_io/ ><code>JSON_NO_IO</code></a></td> <td style="text-align: right;">764 ms / 836 ms</td> <td style="text-align: right;">1022 ms / 1117 ms</td> </tr> <tr> <td><a href=../../api/macros/json_use_global_udls/ ><code>JSON_USE_GLOBAL_UDLS</code></a><code>=0</code></td> <td style="text-align: right;">763 ms / 852 ms</td> <td style="text-align: right;">1019 ms / 1106 ms</td> </tr> </tbody> </table> <p><code>JSON_USE_GLOBAL_UDLS</code> only controls <em>where</em> the literals are declared; to avoid their cost, use <code>JSON_NO_AUTOMATIC_UDLS</code> instead.</p> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href=../../api/macros/json_no_automatic_udls/ ><code>JSON_NO_AUTOMATIC_UDLS</code></a> - 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