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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=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/json_view/differences/" rel="canonical"><link href=../lifetime/ rel=prev><link href=../reading/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.8.0"><title>Differences from basic_json - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.57a0d79d.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.fb2fffe2.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet 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class=md-ellipsis> v2.0.10 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.9/ class=md-nav__link> <span class=md-ellipsis> v2.0.9 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.8/ class=md-nav__link> <span class=md-ellipsis> v2.0.8 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.7/ class=md-nav__link> <span class=md-ellipsis> v2.0.7 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.6/ class=md-nav__link> <span class=md-ellipsis> v2.0.6 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.5/ class=md-nav__link> <span class=md-ellipsis> v2.0.5 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.4/ class=md-nav__link> <span class=md-ellipsis> v2.0.4 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.3/ class=md-nav__link> <span class=md-ellipsis> v2.0.3 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.2/ class=md-nav__link> <span class=md-ellipsis> v2.0.2 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.1/ class=md-nav__link> <span class=md-ellipsis> v2.0.1 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v2.0.0/ class=md-nav__link> <span class=md-ellipsis> v2.0.0 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v1.1.0/ class=md-nav__link> <span class=md-ellipsis> v1.1.0 </span> </a> </li> <li class=md-nav__item> <a href=../../../home/releases/v1.0.0/ class=md-nav__link> <span class=md-ellipsis> v1.0.0 </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_1_6> <label class=md-nav__link for=__nav_1_6 id=__nav_1_6_label tabindex=0> <span class=md-ellipsis> Blog </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_1_6_label aria-expanded=false> <label class=md-nav__title for=__nav_1_6> <span class="md-nav__icon md-icon"></span> Blog </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../home/blog/how_3_13_0_got_faster/ class=md-nav__link> <span class=md-ellipsis> How 3.13.0 got faster </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../../home/design_goals/ class=md-nav__link> <span class=md-ellipsis> Design goals </span> </a> </li> <li class=md-nav__item> <a href=../../../home/architecture/ class=md-nav__link> <span class=md-ellipsis> Architecture </span> </a> </li> <li class=md-nav__item> <a href=../../../home/customers/ class=md-nav__link> <span class=md-ellipsis> Customers </span> </a> </li> <li class=md-nav__item> <a href=../../../home/sponsors/ class=md-nav__link> <span class=md-ellipsis> Sponsors </span> </a> </li> <li class=md-nav__item> <a href=../../../home/debugging/ class=md-nav__link> <span class=md-ellipsis> Debugging </span> </a> </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_2 checked> <div class="md-nav__link md-nav__container"> <a href=../../ class="md-nav__link "> <span class=md-ellipsis> Features </span> </a> <label class="md-nav__link " for=__nav_2 id=__nav_2_label tabindex> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_2_label aria-expanded=true> <label class=md-nav__title for=__nav_2> <span class="md-nav__icon md-icon"></span> Features </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../arbitrary_types/ class=md-nav__link> <span class=md-ellipsis> Arbitrary Type Conversions </span> </a> </li> <li class=md-nav__item> <a href=../../type_recipes/ class=md-nav__link> <span class=md-ellipsis> Recipes for Common Types </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_4> <div class="md-nav__link md-nav__container"> <a href=../../binary_formats/ class="md-nav__link "> <span class=md-ellipsis> Binary Formats </span> </a> <label class="md-nav__link " for=__nav_2_4 id=__nav_2_4_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_4_label aria-expanded=false> <label class=md-nav__title for=__nav_2_4> <span class="md-nav__icon md-icon"></span> Binary Formats </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../binary_formats/bjdata/ class=md-nav__link> <span class=md-ellipsis> BJData </span> </a> </li> <li class=md-nav__item> <a href=../../binary_formats/bon8/ class=md-nav__link> <span class=md-ellipsis> BON8 </span> </a> </li> <li class=md-nav__item> <a href=../../binary_formats/bson/ class=md-nav__link> <span class=md-ellipsis> BSON </span> </a> </li> <li class=md-nav__item> <a href=../../binary_formats/cbor/ class=md-nav__link> <span class=md-ellipsis> CBOR </span> </a> </li> <li class=md-nav__item> <a href=../../binary_formats/messagepack/ class=md-nav__link> <span class=md-ellipsis> MessagePack </span> </a> </li> <li class=md-nav__item> <a href=../../binary_formats/ubjson/ class=md-nav__link> <span class=md-ellipsis> UBJSON </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../binary_values/ class=md-nav__link> <span class=md-ellipsis> Binary Values </span> </a> </li> <li class=md-nav__item> <a 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_9> <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_9 id=__nav_2_9_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_9_label aria-expanded=false> <label class=md-nav__title for=__nav_2_9> <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=../../files/ class=md-nav__link> <span class=md-ellipsis> Reading and writing files </span> </a> </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=../../no_exceptions/ class=md-nav__link> <span class=md-ellipsis> Working Without Exceptions </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_21> <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_21 id=__nav_2_21_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_21_label aria-expanded=false> <label class=md-nav__title for=__nav_2_21> <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/large_and_partial_input/ class=md-nav__link> <span class=md-ellipsis> Large, Streamed, and Partial Input </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> <a href=../../macros/ class=md-nav__link> <span class=md-ellipsis> Supported Macros </span> </a> </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_27> <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_27 id=__nav_2_27_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_27_label aria-expanded=false> <label class=md-nav__title for=__nav_2_27> <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> <li class="md-nav__item md-nav__item--active md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_28 checked> <div class="md-nav__link md-nav__container"> <a href=../ class="md-nav__link "> <span class=md-ellipsis> Zero-copy views </span> </a> <label class="md-nav__link " for=__nav_2_28 id=__nav_2_28_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_28_label aria-expanded=true> <label class=md-nav__title for=__nav_2_28> <span class="md-nav__icon md-icon"></span> Zero-copy views </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../lifetime/ class=md-nav__link> <span class=md-ellipsis> Ownership and lifetime </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> Differences from basic_json </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Differences from basic_json </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=#summary class=md-nav__link> <span class=md-ellipsis> Summary </span> </a> </li> <li class=md-nav__item> <a href=#parsing class=md-nav__link> <span class=md-ellipsis> Parsing </span> </a> <nav class=md-nav aria-label=Parsing> <ul class=md-nav__list> <li class=md-nav__item> <a href=#what-is-the-same class=md-nav__link> <span class=md-ellipsis> What is the same </span> </a> </li> <li class=md-nav__item> <a href=#what-is-different class=md-nav__link> <span class=md-ellipsis> What is different </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#element-access class=md-nav__link> <span class=md-ellipsis> Element access </span> </a> </li> <li class=md-nav__item> <a href=#objects class=md-nav__link> <span class=md-ellipsis> Objects </span> </a> <nav class=md-nav aria-label=Objects> <ul class=md-nav__list> <li class=md-nav__item> <a href=#object-member-order class=md-nav__link> <span class=md-ellipsis> Object member order </span> </a> </li> <li class=md-nav__item> <a href=#duplicate-keys class=md-nav__link> <span class=md-ellipsis> Duplicate keys </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#conversions class=md-nav__link> <span class=md-ellipsis> Conversions </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=#comparison class=md-nav__link> <span class=md-ellipsis> Comparison </span> </a> </li> <li class=md-nav__item> <a href=#exception-context class=md-nav__link> <span class=md-ellipsis> Exception context </span> </a> </li> <li class=md-nav__item> <a href=#what-a-view-does-not-have class=md-nav__link> <span class=md-ellipsis> What a view does not have </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> <li class=md-nav__item> <a href=#version-history class=md-nav__link> <span class=md-ellipsis> Version history </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../reading/ class=md-nav__link> <span class=md-ellipsis> Reading values </span> </a> </li> <li class=md-nav__item> <a href=../generic_code/ class=md-nav__link> <span class=md-ellipsis> Writing generic code </span> </a> </li> <li class=md-nav__item> <a href=../editing/ class=md-nav__link> <span class=md-ellipsis> Editing a document </span> </a> </li> <li class=md-nav__item> <a href=../images/ class=md-nav__link> <span class=md-ellipsis> Images </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/bjdata_version_t/ class=md-nav__link> <span class=md-ellipsis> bjdata_version_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_diff/ class=md-nav__link> <span class=md-ellipsis> merge_diff </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> <li class=md-nav__item> <a href=../../../api/basic_json/with_t/ class=md-nav__link> <span class=md-ellipsis> with_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/basic_json_document/ class="md-nav__link "> <span class=md-ellipsis> basic_json_document </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> basic_json_document </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../api/basic_json_document/basic_json_document/ class=md-nav__link> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/accept/ class=md-nav__link> <span class=md-ellipsis> accept </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/erase/ class=md-nav__link> <span class=md-ellipsis> erase </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/insert/ class=md-nav__link> <span class=md-ellipsis> insert </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/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_document/load/ class=md-nav__link> <span class=md-ellipsis> load </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/memory_usage/ class=md-nav__link> <span class=md-ellipsis> memory_usage </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/node_count/ class=md-nav__link> <span class=md-ellipsis> node_count </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/owns_source/ class=md-nav__link> <span class=md-ellipsis> owns_source </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/parse/ class=md-nav__link> <span class=md-ellipsis> parse </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/parse_copy/ class=md-nav__link> <span class=md-ellipsis> parse_copy </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/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_document/read/ class=md-nav__link> <span class=md-ellipsis> read </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/root/ class=md-nav__link> <span class=md-ellipsis> root </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/save/ class=md-nav__link> <span class=md-ellipsis> save </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/set/ class=md-nav__link> <span class=md-ellipsis> set </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/shrink_to_fit/ class=md-nav__link> <span class=md-ellipsis> shrink_to_fit </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_document/source/ class=md-nav__link> <span class=md-ellipsis> source </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/basic_json_view/ class="md-nav__link "> <span class=md-ellipsis> basic_json_view </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> basic_json_view </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../api/basic_json_view/basic_json_view/ class=md-nav__link> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/at/ class=md-nav__link> <span class=md-ellipsis> at </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/back/ class=md-nav__link> <span class=md-ellipsis> back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/begin/ class=md-nav__link> <span class=md-ellipsis> begin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/cbegin/ class=md-nav__link> <span class=md-ellipsis> cbegin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/cend/ class=md-nav__link> <span class=md-ellipsis> cend </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/contains/ class=md-nav__link> <span class=md-ellipsis> contains </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/count/ class=md-nav__link> <span class=md-ellipsis> count </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/dump/ class=md-nav__link> <span class=md-ellipsis> dump </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/empty/ class=md-nav__link> <span class=md-ellipsis> empty </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/end/ class=md-nav__link> <span class=md-ellipsis> end </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/find/ class=md-nav__link> <span class=md-ellipsis> find </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/front/ class=md-nav__link> <span class=md-ellipsis> front </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/get/ class=md-nav__link> <span class=md-ellipsis> get </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/get_string/ class=md-nav__link> <span class=md-ellipsis> get_string </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/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_view/items/ class=md-nav__link> <span class=md-ellipsis> items </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/materialize/ class=md-nav__link> <span class=md-ellipsis> materialize </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/number_format/ class=md-nav__link> <span class=md-ellipsis> number_format </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/number_token/ class=md-nav__link> <span class=md-ellipsis> number_token </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/operator_ltlt/ class=md-nav__link> <span class=md-ellipsis> operator<< </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/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_view/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/size/ class=md-nav__link> <span class=md-ellipsis> size </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/source_offset/ class=md-nav__link> <span class=md-ellipsis> source_offset </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/type/ class=md-nav__link> <span class=md-ellipsis> type </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json_view/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_view/value/ class=md-nav__link> <span class=md-ellipsis> value </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_4> <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_4 id=__nav_4_4_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_4_label aria-expanded=false> <label class=md-nav__title for=__nav_4_4> <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_5> <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_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> 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/is_json_view/ class=md-nav__link> <span class=md-ellipsis> is_json_view </span> </a> </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> <a href=../../../api/json_document/ class=md-nav__link> <span class=md-ellipsis> json_document </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_editable_document/ class=md-nav__link> <span class=md-ellipsis> json_editable_document </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_editable_view/ class=md-nav__link> <span class=md-ellipsis> json_editable_view </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_11> <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_11 id=__nav_4_11_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_11_label aria-expanded=false> <label class=md-nav__title for=__nav_4_11> <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_12> <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_12 id=__nav_4_12_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_12_label aria-expanded=false> <label class=md-nav__title for=__nav_4_12> <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/json_view/ class=md-nav__link> <span class=md-ellipsis> json_view </span> </a> </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_json_document/ class=md-nav__link> <span class=md-ellipsis> ordered_json_document </span> </a> </li> <li class=md-nav__item> <a href=../../../api/ordered_json_editable_document/ class=md-nav__link> <span class=md-ellipsis> ordered_json_editable_document </span> </a> </li> <li class=md-nav__item> <a href=../../../api/ordered_json_editable_view/ class=md-nav__link> <span class=md-ellipsis> ordered_json_editable_view </span> </a> </li> <li class=md-nav__item> <a href=../../../api/ordered_json_view/ class=md-nav__link> <span class=md-ellipsis> ordered_json_view </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> <a href=../../../api/view_mode/ class=md-nav__link> <span class=md-ellipsis> view_mode </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_25> <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_25 id=__nav_4_25_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_25_label aria-expanded=false> <label class=md-nav__title for=__nav_4_25> <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_stream_bulk_scan/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_STREAM_BULK_SCAN </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_disable_unlocked_file_io/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_UNLOCKED_FILE_IO </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_range_view_conversion/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_RANGE_VIEW_CONVERSION </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_simd/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_SIMD </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=#summary class=md-nav__link> <span class=md-ellipsis> Summary </span> </a> </li> <li class=md-nav__item> <a href=#parsing class=md-nav__link> <span class=md-ellipsis> Parsing </span> </a> <nav class=md-nav aria-label=Parsing> <ul class=md-nav__list> <li class=md-nav__item> <a href=#what-is-the-same class=md-nav__link> <span class=md-ellipsis> What is the same </span> </a> </li> <li class=md-nav__item> <a href=#what-is-different class=md-nav__link> <span class=md-ellipsis> What is different </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#element-access class=md-nav__link> <span class=md-ellipsis> Element access </span> </a> </li> <li class=md-nav__item> <a href=#objects class=md-nav__link> <span class=md-ellipsis> Objects </span> </a> <nav class=md-nav aria-label=Objects> <ul class=md-nav__list> <li class=md-nav__item> <a href=#object-member-order class=md-nav__link> <span class=md-ellipsis> Object member order </span> </a> </li> <li class=md-nav__item> <a href=#duplicate-keys class=md-nav__link> <span class=md-ellipsis> Duplicate keys </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#conversions class=md-nav__link> <span class=md-ellipsis> Conversions </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=#comparison class=md-nav__link> <span class=md-ellipsis> Comparison </span> </a> </li> <li class=md-nav__item> <a href=#exception-context class=md-nav__link> <span class=md-ellipsis> Exception context </span> </a> </li> <li class=md-nav__item> <a href=#what-a-view-does-not-have class=md-nav__link> <span class=md-ellipsis> What a view does not have </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> <li class=md-nav__item> <a href=#version-history class=md-nav__link> <span class=md-ellipsis> Version history </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/json_view/differences.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/json_view/differences.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=differences-from-basic_json>Differences from <code>basic_json</code><a class=headerlink href=#differences-from-basic_json title="Permanent link">¶</a></h1> <p>A <a href=../../../api/basic_json_view/ ><code>basic_json_view</code></a> offers the read-only part of the <a href=../../../api/basic_json/ ><code>basic_json</code></a> interface, and in most respects it behaves exactly like the value <a href=../../../api/basic_json/parse/ ><code>basic_json::parse()</code></a> would have built from the same text. This page lists where it does not: what a document parses differently, what a view's functions do differently, and which parts of the <code>basic_json</code> interface a view does not have.</p> <h2 id=summary>Summary<a class=headerlink href=#summary title="Permanent link">¶</a></h2> <table> <thead> <tr> <th></th> <th><code>basic_json</code> value from <code>parse()</code></th> <th>view of a <code>json_document</code></th> <th>to get the <code>basic_json</code> behavior</th> </tr> </thead> <tbody> <tr> <td><a href=#parsing>Integer types</a></td> <td>any <code>number_integer_t</code>/<code>number_unsigned_t</code></td> <td>64-bit only (compile-time check)</td> <td>—</td> </tr> <tr> <td><a href=#parsing>Input size</a></td> <td>unlimited</td> <td>less than 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr></td> <td>—</td> </tr> <tr> <td><a href=#parsing>Parser callbacks</a></td> <td><code>parser_callback_t</code></td> <td>none</td> <td>filter while iterating</td> </tr> <tr> <td><a href=#element-access><code>operator[]</code> on a missing key or index</a></td> <td>inserts (non-<code>const</code>) or undefined behavior (<code>const</code>)</td> <td>returns a discarded view</td> <td>—</td> </tr> <tr> <td><a href=#object-member-order>Object member order</a></td> <td>sorted by key (<code>json</code>), insertion order (<code>ordered_json</code>)</td> <td>document order</td> <td><code>materialize()</code></td> </tr> <tr> <td><a href=#duplicate-keys>Repeated keys</a></td> <td>the last value is kept</td> <td>lookups find the first member; iteration, <code>size()</code>, and <code>dump()</code> see all of them</td> <td><code>materialize()</code></td> </tr> <tr> <td><a href=#conversions>Conversions</a></td> <td><code>get<T>()</code>, implicit conversions, <code>get_ptr()</code>, <code>get_ref()</code></td> <td><code>get<T>()</code>, <code>get_string()</code>, <code>number_token()</code></td> <td><code>materialize()</code></td> </tr> <tr> <td><a href=#serialization>Number spelling</a></td> <td>lost when parsing</td> <td>kept: <code>number_token()</code>, <code>number_format::source</code></td> <td>—</td> </tr> <tr> <td><a href=#comparison>Comparison</a></td> <td><code>==</code>, <code>!=</code>, <code><</code>, <code><=></code>, ...</td> <td><code>==</code> and <code>!=</code> only</td> <td><code>materialize()</code></td> </tr> <tr> <td><a href=#what-a-view-does-not-have>Modification</a></td> <td>member functions of the value</td> <td>only through an <a href=../editing/ >editable document</a></td> <td><code>materialize()</code></td> </tr> <tr> <td><a href=#what-a-view-does-not-have>Iterators</a></td> <td>bidirectional (<code>rbegin()</code>/<code>rend()</code>)</td> <td>forward only</td> <td><code>materialize()</code></td> </tr> </tbody> </table> <p class=nj-table-caption>Each row is one difference; the last column names the way to get <code>basic_json</code>'s behavior from a view, where there is one.</p> <h2 id=parsing>Parsing<a class=headerlink href=#parsing title="Permanent link">¶</a></h2> <h3 id=what-is-the-same>What is the same<a class=headerlink href=#what-is-the-same title="Permanent link">¶</a></h3> <ul> <li><strong>Accept/reject.</strong> <a href=../../../api/basic_json_document/accept/ ><code>accept()</code></a> and <a href=../../../api/basic_json_document/parse/ ><code>parse()</code></a> accept and reject exactly the same inputs as <a href=../../../api/basic_json/accept/ ><code>basic_json::accept()</code></a>/<a href=../../../api/basic_json/parse/ ><code>basic_json::parse()</code></a>, with the same <code>ignore_comments</code> and <code>ignore_trailing_commas</code> options.</li> <li><strong>Errors.</strong> A failing parse throws the same exception — the same id, message, and position — because on failure the library's own parser is run on the same bytes to produce the diagnostic. Valid input never pays for this, and the replay builds no values: it costs about a lexing pass up to the error. <code class=highlight><span class=n>allow_exceptions</span><span class=w> </span><span class=o>==</span><span class=w> </span><span class=nb>false</span></code> skips the replay and gives a <a href=../../../api/basic_json_document/is_discarded/ >discarded</a> document instead of throwing, just as it gives a discarded value for <code class=highlight><span class=n>basic_json</span><span class=o>::</span><span class=n>parse</span><span class=p>()</span></code>.</li> <li><strong>Number classification.</strong> An integer literal that does not fit into the 64-bit integer type becomes a floating-point value, exactly as it does for <code class=highlight><span class=n>basic_json</span><span class=o>::</span><span class=n>parse</span><span class=p>()</span></code>.</li> <li><strong>Macros.</strong> <a href=../../../api/macros/json_strict_nul_handling/ ><code>JSON_STRICT_NUL_HANDLING</code></a> and <a href=../../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a>/<a href=../../../api/macros/json_throw_user/ ><code>JSON_THROW_USER</code></a> behave the same way they do for <code><nlohmann/json.hpp></code>. These are the macros that change what the parser accepts or how it reports errors. The other macros only affect the values <code>materialize()</code> produces, through <code>BasicJsonType</code>. Two of them also add context to the exceptions of views, see <a href=#exception-context>Exception context</a>.</li> </ul> <h3 id=what-is-different>What is different<a class=headerlink href=#what-is-different title="Permanent link">¶</a></h3> <ul> <li><strong>Only 64-bit integers.</strong> <code>basic_json_document<BasicJsonType></code> requires <code>BasicJsonType::number_integer_t</code> and <code>number_unsigned_t</code> to both be 64 bits wide; this is a compile-time <code class=highlight><span class=k>static_assert</span></code>.</li> <li><strong>A 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> input limit.</strong> An input of 4294967280 bytes (4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes) or more throws <a href=../../../home/exceptions/#jsonexceptionout_of_range416><code>out_of_range.416</code></a>, a limit <code class=highlight><span class=n>basic_json</span><span class=o>::</span><span class=n>parse</span><span class=p>()</span></code> does not have. It keeps an index entry at 16 bytes: offsets and counts are 32 bits wide. The limit is 16 bytes below 2^32, because the parser reads in 16-byte steps, and a position one step past the end must still fit.</li> <li><strong>A stream is always read to its end.</strong> There is no partial/streaming read of an <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>istream</span></code>: the stream is read to its end into a buffer the document owns, and parsing starts after that. For a file, reading it into a <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>string</span></code> yourself and parsing that (an lvalue is borrowed) is therefore not more expensive in memory, and was about 6 to 12 % faster than parsing from an <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>ifstream</span></code>.</li> <li><strong>No parser callbacks.</strong> <a href=../../../api/basic_json_document/parse/ ><code>parse()</code></a> takes no <a href=../../../api/basic_json/parser_callback_t/ ><code>parser_callback_t</code></a>: a document always indexes the whole text. Skip the values you do not need when reading the view instead.</li> <li><strong><abbr title="JavaScript Object Notation">JSON</abbr> text only.</strong> A document is parsed from <abbr title="JavaScript Object Notation">JSON</abbr> text; there is no counterpart of <a href=../../../api/basic_json/from_cbor/ ><code>from_cbor()</code></a> and the other binary formats, and <a href=../../../api/basic_json_view/is_binary/ ><code>is_binary()</code></a> is always <code class=highlight><span class=nb>false</span></code>.</li> </ul> <h2 id=element-access>Element access<a class=headerlink href=#element-access title="Permanent link">¶</a></h2> <p><strong>Chained access is safe.</strong> <a href=../../../api/basic_json_view/operator%5B%5D/ ><code>operator[]</code></a> with a missing key, an index out of range, or an unresolvable <abbr title="JavaScript Object Notation">JSON</abbr> pointer returns a <a href=../../../api/basic_json_view/is_discarded/ >discarded</a> view, and <code>operator[]</code> on a discarded view returns a discarded view without throwing: <code class=highlight><span class=n>v</span><span class=p>[</span><span class=s>"a"</span><span class=p>][</span><span class=s>"b"</span><span class=p>][</span><span class=mi>0</span><span class=p>]</span></code> can be tested once at the end. Type errors on values that exist (a key on an array, an index on an object) still throw, and <a href=../../../api/basic_json_view/at/ ><code>at</code></a> throws for every missing value.</p> <p><code>basic_json</code>'s non-<code>const</code> <code>operator[]</code> instead inserts a missing key, and its <code>const</code> <code>operator[]</code> has undefined behavior for one.</p> <h2 id=objects>Objects<a class=headerlink href=#objects title="Permanent link">¶</a></h2> <h3 id=object-member-order>Object member order<a class=headerlink href=#object-member-order title="Permanent link">¶</a></h3> <p><a href=../../../api/basic_json_view/begin/ ><code>begin()</code></a>/<a href=../../../api/basic_json_view/end/ ><code>end()</code></a> and <a href=../../../api/basic_json_view/items/ ><code>items()</code></a> visit an object's members in the order they appear in the source text. <code>basic_json</code>'s default <code>object_t</code> is a <code>std::map</code>, which sorts by key, so iterating a <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a>d value can print members in a different order than iterating the view they came from. <a href=../../../api/basic_json_view/dump/ ><code>dump()</code></a> of a view writes members in document order as well.</p> <h3 id=duplicate-keys>Duplicate keys<a class=headerlink href=#duplicate-keys title="Permanent link">¶</a></h3> <div class="admonition warning"> <p class=admonition-title>A lookup in a view and in the parsed value can give different answers</p> <p>If an object in the source text repeats a key, <a href=../../../api/basic_json_view/operator%5B%5D/ ><code>operator[]</code></a>, <a href=../../../api/basic_json_view/at/ ><code>at</code></a>, <a href=../../../api/basic_json_view/find/ ><code>find</code></a>, <a href=../../../api/basic_json_view/value/ ><code>value</code></a>, <a href=../../../api/basic_json_view/contains/ ><code>contains</code></a>, and <abbr title="JavaScript Object Notation">JSON</abbr> pointer resolution all return the <strong>first</strong> member with that key. <code>basic_json::parse()</code> instead keeps the <strong>last</strong> value of a repeated key, so for <code class=highlight><span class=p>{</span><span class=s>"a"</span><span class=o>:</span><span class=mi>1</span><span class=p>,</span><span class=s>"a"</span><span class=o>:</span><span class=mi>2</span><span class=p>}</span></code>, <code class=highlight><span class=n>view</span><span class=p>[</span><span class=s>"a"</span><span class=p>]</span></code> is <code class=highlight><span class=mi>1</span></code> while <code class=highlight><span class=n>parse</span><span class=p>(</span><span class=n>text</span><span class=p>)[</span><span class=s>"a"</span><span class=p>]</span></code> is <code class=highlight><span class=mi>2</span></code>. <a href=../../../api/basic_json_view/count/ ><code>count</code></a> counts every member with the key, so it is <code class=highlight><span class=mi>2</span></code> here.</p> </div> <p><a href=../../../api/basic_json_view/begin/ ><code>begin()</code></a>/<a href=../../../api/basic_json_view/end/ ><code>end()</code></a> and <a href=../../../api/basic_json_view/items/ ><code>items()</code></a> visit <em>every</em> occurrence, in document order, and <a href=../../../api/basic_json_view/size/ ><code>size()</code></a> counts all of them, so <code class=highlight><span class=n>view</span><span class=p>.</span><span class=n>size</span><span class=p>()</span></code> can be larger than <code class=highlight><span class=n>view</span><span class=p>.</span><span class=n>materialize</span><span class=p>().</span><span class=n>size</span><span class=p>()</span></code>. <a href=../../../api/basic_json_view/dump/ ><code>dump()</code></a> writes every occurrence, too, so <code class=highlight><span class=n>materialize</span><span class=p>().</span><span class=n>dump</span><span class=p>()</span></code> gives a different result for such an object.</p> <p><strong>Why the first?</strong> A lookup can stop as soon as it finds a match. Returning the last member would force every lookup to scan all members of the object, even when the key is found at the very first one: this made lookups in small objects 1.6 to 3.4 times slower. The hash index of the keys of objects with 128 members or more leads to the first member of a key as well. Other zero-copy parsers that index the source text, such as yyjson and simdjson, also return the first member. <abbr title="Request for Comments">RFC</abbr> 8259 only says that names within an object SHOULD be unique and that the behavior of a receiver that sees duplicates is unpredictable, so neither choice is wrong.</p> <p>The same holds for <a href=../../../api/basic_json_view/get/ ><code>get<T>()</code></a> of a type whose <code>from_json()</code> reads the view, such as the types of the <code>NLOHMANN_DEFINE_TYPE_*</code> macros: their members are looked up, so <code class=highlight><span class=n>get</span><span class=o><</span><span class=n>point</span><span class=o>></span><span class=p>()</span></code> of <code class=highlight><span class=p>{</span><span class=s>"x"</span><span class=o>:</span><span class=mi>1</span><span class=p>,</span><span class=s>"x"</span><span class=o>:</span><span class=mi>2</span><span class=p>}</span></code> reads <code class=highlight><span class=n>x</span><span class=w> </span><span class=o>==</span><span class=w> </span><span class=mi>1</span></code>, while <code class=highlight><span class=n>materialize</span><span class=p>().</span><span class=n>get</span><span class=o><</span><span class=n>point</span><span class=o>></span><span class=p>()</span></code> reads <code class=highlight><span class=mi>2</span></code>.</p> <p><strong>What stays the same as <code>parse()</code>?</strong> <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> and <a href=../../../api/basic_json_view/get/ ><code>get<std::map<...>>()</code></a> (and the other containers built from an object) replay every member in order, so they keep the <em>last</em> value exactly like <code class=highlight><span class=n>basic_json</span><span class=o>::</span><span class=n>parse</span><span class=p>()</span></code> (at the position of the first occurrence of the key, for an <a href=../../../api/ordered_json/ ><code>ordered_json</code></a>).</p> <p><strong>How do I get the value <code>parse()</code> would give?</strong> Either call <code class=highlight><span class=n>view</span><span class=p>.</span><span class=n>materialize</span><span class=p>()</span></code> and look the key up in the result, or iterate the members and keep the last match:</p> <div class=highlight><pre><span></span><code><span class=c1>// the last member with the key "a", as parse() would keep it</span>
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<span class=n>json_view</span><span class=w> </span><span class=n>last</span><span class=p>;</span>
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<span class=k>for</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>item</span><span class=w> </span><span class=o>:</span><span class=w> </span><span class=n>view</span><span class=p>.</span><span class=n>items</span><span class=p>())</span>
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<span class=p>{</span>
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<span class=w> </span><span class=k>if</span><span class=w> </span><span class=p>(</span><span class=n>item</span><span class=p>.</span><span class=n>key</span><span class=p>()</span><span class=w> </span><span class=o>==</span><span class=w> </span><span class=s>"a"</span><span class=p>)</span>
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<span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=n>last</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>item</span><span class=p>.</span><span class=n>value</span><span class=p>();</span>
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<span class=w> </span><span class=p>}</span>
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<span class=p>}</span>
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</code></pre></div> <p>If you cannot trust the source text to have unique keys, check <a href=../../../api/basic_json_view/size/ ><code>size()</code></a> against the number of distinct keys, or reject duplicates when iterating.</p> <h2 id=conversions>Conversions<a class=headerlink href=#conversions title="Permanent link">¶</a></h2> <ul> <li><strong>No implicit conversions.</strong> A view has no <code class=highlight><span class=k>operator</span><span class=w> </span><span class=n>ValueType</span><span class=p>()</span></code>, no <code class=highlight><span class=n>get_ptr</span><span class=p>()</span></code>, and no <code class=highlight><span class=n>get_ref</span><span class=p>()</span></code>; use <a href=../../../api/basic_json_view/get/ ><code>get<T>()</code></a>, or <a href=../../../api/basic_json_view/get_string/ ><code>get_string()</code></a> for a string without a copy.</li> <li><strong><code>from_json()</code> overloads.</strong> <a href=../../../api/basic_json_view/get/ ><code>get<T>()</code></a> calls <code>T</code>'s <code>from_json()</code> with the view only if that <code>from_json()</code> accepts views, and with <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> otherwise; see <a href=../generic_code/#a-from_json-that-reads-views>A <code>from_json()</code> that reads views</a>. Both give the same result except for <a href=#duplicate-keys>repeated keys</a>.</li> <li><strong><code>string_view</code> members.</strong> A struct with a <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>string_view</span></code> member decoded from a view points into the document, see <a href=../reading/#string_view-members><code>string_view</code> members</a>. Decoding the same struct from a <code>json</code> value compiles, too, but dangles at once if the value is a temporary.</li> </ul> <h2 id=serialization>Serialization<a class=headerlink href=#serialization title="Permanent link">¶</a></h2> <p><a href=../../../api/basic_json_view/dump/ ><code>dump()</code></a> writes numbers the way <a href=../../../api/basic_json/dump/ ><code>basic_json::dump()</code></a> would by default, but writes object members in <a href=#object-member-order>document order</a> and writes <a href=#duplicate-keys>every occurrence of a repeated key</a>.</p> <p>A view can also do what a <code>basic_json</code> value cannot: <a href=../../../api/basic_json_view/number_token/ ><code>number_token()</code></a> and <a href=../../../api/basic_json_view/number_format/ ><code>number_format::source</code></a> give every number exactly as it was spelled in the source text, while parsing into <code>basic_json</code> already reduces a number to its <code class=highlight><span class=kt>double</span></code>/<code class=highlight><span class=kt>int64_t</span></code> value. See <a href=../reading/#writing-a-view-back>Writing a view back</a>.</p> <h2 id=comparison>Comparison<a class=headerlink href=#comparison title="Permanent link">¶</a></h2> <p><strong>Ordering comparisons are not provided</strong> by <code>basic_json_view</code> — there is no <code class=highlight><span class=k>operator</span><span class=o><</span></code>. <a href=../../../api/basic_json_view/operator_eq/ ><code>operator==</code></a> and <a href=../../../api/basic_json_view/operator_ne/ ><code>operator!=</code></a> are provided, though: two views, or a view and a <code>BasicJsonType</code> value, compare equal exactly when <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> or <a href=../../../api/basic_json/parse/ ><code>parse()</code></a> would produce equal values for them, without ever building a tree to do it. For ordering, <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> is the way to get a value you can compare.</p> <h2 id=exception-context>Exception context<a class=headerlink href=#exception-context title="Permanent link">¶</a></h2> <p>With <a href=../../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a>, an exception of a view names the <abbr title="JavaScript Object Notation">JSON</abbr> Pointer path of the value within the document, and with <a href=../../../api/macros/json_diagnostic_positions/ ><code>JSON_DIAGNOSTIC_POSITIONS</code></a>, it names the bytes of the value in the source text, as they do for the exceptions of <code class=highlight><span class=n>basic_json</span></code>.</p> <p>A view has neither parent pointers nor stored positions, so both are found from the document's index when the exception is thrown. This takes time linear in the size of the document. One exception has neither: <code>key()</code> of an iterator over an array or a primitive value (<a href=../../../home/exceptions/#jsonexceptioninvalid_iterator207><code>invalid_iterator.207</code></a>), because a view's iterator does not know the value it iterates over.</p> <p><strong>Fewer source positions after edits.</strong> With <a href=../../../api/macros/json_diagnostic_positions/ ><code>JSON_DIAGNOSTIC_POSITIONS</code></a> enabled, <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> sets the same positions as <code class=highlight><span class=n>basic_json</span><span class=o>::</span><span class=n>parse</span><span class=p>()</span></code>. In an <a href=../editing/ >editable document</a>, a value written by an edit has none, and neither has an array or object whose elements changed or whose last element has none; a <code>basic_json</code> value keeps its positions when it is changed. See <a href=../../../api/basic_json_view/materialize/#notes><code>materialize()</code></a>.</p> <h2 id=what-a-view-does-not-have>What a view does not have<a class=headerlink href=#what-a-view-does-not-have title="Permanent link">¶</a></h2> <p>A view is a read-only handle. These parts of the <code>basic_json</code> interface have no counterpart on a view; <a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> the subtree to use them:</p> <ul> <li><strong>Modifiers</strong> such as <code>push_back</code>, <code>insert</code>, <code>erase</code>, <code>update</code>, or <code>operator=</code>. A view never changes a value itself; an <a href=../editing/ >editable document</a> changes the values its views refer to through <a href=../../../api/basic_json_document/set/ ><code>set</code></a>, <a href=../../../api/basic_json_document/push_back/ ><code>push_back</code></a>, <a href=../../../api/basic_json_document/insert/ ><code>insert</code></a>, and <a href=../../../api/basic_json_document/erase/ ><code>erase</code></a>.</li> <li><strong>Reverse iteration.</strong> A view's iterator is a forward iterator; there is no <code>rbegin()</code>/<code>rend()</code>.</li> <li><strong><abbr title="JavaScript Object Notation">JSON</abbr> Patch and friends</strong>: <a href=../../../api/basic_json/patch/ ><code>patch()</code></a>, <a href=../../../api/basic_json/merge_patch/ ><code>merge_patch()</code></a>, <a href=../../../api/basic_json/diff/ ><code>diff()</code></a>, <a href=../../../api/basic_json/flatten/ ><code>flatten()</code></a>.</li> <li><strong>Binary formats</strong>: <a href=../../../api/basic_json/to_cbor/ ><code>to_cbor()</code></a> and the other writers, and binary values (<a href=../../../api/basic_json/get_binary/ ><code>get_binary()</code></a>).</li> </ul> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../ >Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views</a> - overview</li> <li><a href=../../../api/basic_json_view/ ><code>basic_json_view</code></a> - the full interface of a view</li> <li><a href=../../../api/basic_json_view/materialize/ ><code>materialize()</code></a> - build the <code>basic_json</code> value of a view</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> </ul> <!-- 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="November 9, 2026 07:12:00 UTC">November 9, 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> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../lifetime/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Ownership and lifetime"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Ownership and lifetime </div> </div> </a> <a href=../reading/ class="md-footer__link md-footer__link--next" aria-label="Next: Reading values"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Reading values </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <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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