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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 md-nav__link--active"> <span class=md-ellipsis> Zero-copy views </span> </a> <label class="md-nav__link md-nav__link--active" 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> <a href=differences/ class=md-nav__link> <span class=md-ellipsis> Differences from basic_json </span> </a> </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&lt;basic_json&gt; </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/std_hash/ class=md-nav__link> <span class=md-ellipsis> std::hash&lt;basic_json&gt; </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/input_format_t/ class=md-nav__link> <span class=md-ellipsis> input_format_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/insert/ class=md-nav__link> <span class=md-ellipsis> insert </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/invalid_iterator/ class=md-nav__link> <span class=md-ellipsis> invalid_iterator </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_array/ class=md-nav__link> <span class=md-ellipsis> is_array </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_binary/ class=md-nav__link> <span class=md-ellipsis> is_binary </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_boolean/ class=md-nav__link> <span class=md-ellipsis> is_boolean </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_discarded/ class=md-nav__link> <span class=md-ellipsis> is_discarded </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_null/ class=md-nav__link> <span class=md-ellipsis> is_null </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number/ class=md-nav__link> <span class=md-ellipsis> is_number </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_float/ class=md-nav__link> <span class=md-ellipsis> is_number_float </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_integer/ class=md-nav__link> <span class=md-ellipsis> is_number_integer </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_number_unsigned/ class=md-nav__link> <span class=md-ellipsis> is_number_unsigned </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_object/ class=md-nav__link> <span class=md-ellipsis> is_object </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_primitive/ class=md-nav__link> <span class=md-ellipsis> is_primitive </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_string/ class=md-nav__link> <span class=md-ellipsis> is_string </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/is_structured/ class=md-nav__link> <span class=md-ellipsis> is_structured </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/items/ class=md-nav__link> <span class=md-ellipsis> items </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/json_base_class_t/ class=md-nav__link> <span class=md-ellipsis> json_base_class_t </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/json_serializer/ class=md-nav__link> <span class=md-ellipsis> json_serializer </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/max_size/ class=md-nav__link> <span class=md-ellipsis> max_size </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/meta/ class=md-nav__link> <span class=md-ellipsis> meta </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/merge_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&lt;basic_json&gt; </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bjdata/ class=md-nav__link> <span class=md-ellipsis> to_bjdata </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bon8/ class=md-nav__link> <span class=md-ellipsis> to_bon8 </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_bson/ class=md-nav__link> <span class=md-ellipsis> to_bson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_cbor/ class=md-nav__link> <span class=md-ellipsis> to_cbor </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_msgpack/ class=md-nav__link> <span class=md-ellipsis> to_msgpack </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_string/ class=md-nav__link> <span class=md-ellipsis> to_string </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/to_ubjson/ class=md-nav__link> <span class=md-ellipsis> to_ubjson </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type/ class=md-nav__link> <span class=md-ellipsis> type </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type_error/ class=md-nav__link> <span class=md-ellipsis> type_error </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/type_name/ class=md-nav__link> <span class=md-ellipsis> type_name </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/unflatten/ class=md-nav__link> <span class=md-ellipsis> unflatten </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/update/ class=md-nav__link> <span class=md-ellipsis> update </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/value/ class=md-nav__link> <span class=md-ellipsis> value </span> </a> </li> <li class=md-nav__item> <a href=../../api/basic_json/value_t/ class=md-nav__link> <span class=md-ellipsis> value_t </span> </a> </li> <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 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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 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data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#the-problem class=md-nav__link> <span class=md-ellipsis> The problem </span> </a> </li> <li class=md-nav__item> <a href=#the-idea class=md-nav__link> <span class=md-ellipsis> The idea </span> </a> </li> <li class=md-nav__item> <a href=#how-to-use-it class=md-nav__link> <span class=md-ellipsis> How to use it </span> </a> </li> <li class=md-nav__item> <a href=#where-to-go-next class=md-nav__link> <span class=md-ellipsis> Where to go next </span> </a> </li> <li class=md-nav__item> <a href=#choosing-between-json-ordered_json-the-sax-interface-and-json_view class=md-nav__link> <span class=md-ellipsis> Choosing between json, ordered_json, the SAX interface, and json_view </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/index.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/index.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=zero-copy-json-views>Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views<a class=headerlink href=#zero-copy-json-views title="Permanent link">&para;</a></h1> <p><code class=highlight><span class=o>&lt;</span><span class=n>nlohmann</span><span class=o>/</span><span class=n>json_view</span><span class=p>.</span><span class=n>hpp</span><span class=o>&gt;</span></code> adds a read-only, non-owning way to look at a parsed <abbr title="JavaScript Object Notation">JSON</abbr> text, as an alternative to building a <a href=../../api/basic_json/ ><code>basic_json</code></a> tree with <a href=../../api/basic_json/parse/ ><code>parse()</code></a>.</p> <h2 id=the-problem>The problem<a class=headerlink href=#the-problem title="Permanent link">&para;</a></h2> <p><a href=../../api/basic_json/parse/ ><code>basic_json::parse()</code></a> builds a tree of <code>basic_json</code> values: one allocation for every array and object, and every string copied into its own <code>std::string</code>. That is the right trade-off when the program goes on to read and write the value freely, but it does more work than necessary when only a small part of a large <abbr title="JavaScript Object Notation">JSON</abbr> text is actually needed, or when the same text is parsed over and over (many small messages, for instance) and most of the resulting tree is thrown away almost immediately.</p> <h2 id=the-idea>The idea<a class=headerlink href=#the-idea title="Permanent link">&para;</a></h2> <p><a href=../../api/basic_json_document/parse/ ><code>basic_json_document::parse()</code></a> parses the same <abbr title="JavaScript Object Notation">JSON</abbr> grammar, with the same options, but instead of a tree it builds a flat index of the values it found: one <a href=../../home/architecture/#node-index-of-json-views>16-byte entry</a> per value (and one per object key), in document order. Integers are converted while parsing and stored in their entry. Floating-point numbers and strings are referenced in place in the source text: a float is converted when it is read, and only strings that contain escape sequences are decoded, into one shared buffer owned by the document.</p> <p><a href=../../api/basic_json_view/ ><code>basic_json_view</code></a> is a small, trivially copyable handle (two pointers) into that index. It gives you the read-only, type-inspection part of the <code>basic_json</code> interface — <a href=../../api/basic_json_view/type/ ><code>type()</code></a> and the <code>is_*()</code> predicates, <a href=../../api/basic_json_view/size/ ><code>size()</code></a>/<a href=../../api/basic_json_view/empty/ ><code>empty()</code></a> — as well as element access (<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/front/ ><code>front</code></a>/<a href=../../api/basic_json_view/back/ ><code>back</code></a>), lookup (<a href=../../api/basic_json_view/find/ ><code>find</code></a>, <a href=../../api/basic_json_view/contains/ ><code>contains</code></a>, <a href=../../api/basic_json_view/count/ ><code>count</code></a>), and iteration (<a href=../../api/basic_json_view/begin/ ><code>begin</code></a>/<a href=../../api/basic_json_view/end/ ><code>end</code></a>, <a href=../../api/basic_json_view/items/ ><code>items</code></a>) — without ever allocating a <code>basic_json</code> value. When you do need an actual <code>basic_json</code> value for a subtree, <a href=../../api/basic_json_view/materialize/ ><code>materialize()</code></a> builds exactly the one <a href=../../api/basic_json/parse/ ><code>parse()</code></a> would have produced for it.</p> <p>The same small text, parsed both ways:</p> <div class=nj-fig-wrap> <p><svg class="nj-fig nj-jsonview " viewbox="0 0 840 692" role=img aria-labelledby="fig-jvl-title fig-jvl-title-d" xmlns=http://www.w3.org/2000/svg> <title id=fig-jvl-title>The same J&#8203;SON text parsed by basic_json::parse() and by json_document::parse()</title> <desc id=fig-jvl-title-d>The text {&quot;port&quot;: 6379, &quot;price&quot;: 19.90, &quot;tags&quot;: [&quot;eu&quot;, &quot;a\&quot;b&quot;]}. Top: basic_json::parse() builds a tree: the root json value points to a std::map whose three nodes are separate heap allocations; the price is stored as the double 19.9; the tags array is a std::vector of two json values, each pointing to its own std::string. Bottom: json_document::parse() keeps the 54 bytes of source text and builds a flat index of nine 16-byte nodes in document order: object, key port, unsigned integer 6379 (the converted value is in the node), key price, float, key tags, array, string eu, and an escaped string. Keys, the float, and the plain string point back into the source text; the escaped string points into the document&#x27;s buffer of decoded strings. A json_view is two pointers: one to the document and one to a node, here the array.</desc> <defs> <marker id=jvl-line viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-line nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-str viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-str nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-key viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-key nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-num viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-num nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-dec viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-dec nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-own viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-own nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-struct viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-struct nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> <marker id=jvl-bad viewbox="0 0 10 10" refx=9 refy=5 markerwidth=6.5 markerheight=6.5 orient=auto-start-reverse><path class="nj-jsonview-c-bad nj-jsonview-head" d="M0 1 L10 5 L0 9 z"/></marker> </defs> <text class=nj-jsonview-h x=16 y=26 xml:space=preserve>basic_json::parse(): a tree, every array, object, and string in its own heap allocation</text> <rect class=nj-jsonview-box x=16 y=98 width=60 height=34 rx=5 /> <text class=nj-jsonview-mono x=46 y=120 text-anchor=middle xml:space=preserve>json</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M76 115 L106 115"/> <rect class=nj-jsonview-heap x=108 y=98 width=84 height=34 rx=5 /> <text class=nj-jsonview-mono x=150 y=120 text-anchor=middle xml:space=preserve>std::map</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M192 115 L226 67"/> <rect class=nj-jsonview-heap x=228 y=50 width=180 height=34 rx=5 /> <text class="nj-jsonview-mono nj-jsonview-c-key" x=240 y=72 xml:space=preserve>&quot;port&quot;</text> <text class="nj-jsonview-mono nj-jsonview-c-num" x=396 y=72 text-anchor=end xml:space=preserve>6379</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M192 115 L226 115"/> <rect class=nj-jsonview-heap x=228 y=98 width=180 height=34 rx=5 /> <text class="nj-jsonview-mono nj-jsonview-c-key" x=240 y=120 xml:space=preserve>&quot;price&quot;</text> <text class="nj-jsonview-mono nj-jsonview-c-num" x=396 y=120 text-anchor=end xml:space=preserve>19.9</text> <text class=nj-jsonview-note x=418 y=120 xml:space=preserve>double: 19.90 is gone</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M192 115 L226 163"/> <rect class=nj-jsonview-heap x=228 y=146 width=180 height=34 rx=5 /> <text class="nj-jsonview-mono nj-jsonview-c-key" x=240 y=168 xml:space=preserve>&quot;tags&quot;</text> <text class="nj-jsonview-mono nj-jsonview-c-line" x=396 y=168 text-anchor=end xml:space=preserve>•</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M408 163 L442 163"/> <rect class=nj-jsonview-heap x=444 y=146 width=104 height=34 rx=5 /> <text class=nj-jsonview-mono x=496 y=168 text-anchor=middle xml:space=preserve>std::vector</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M548 163 L576 163"/> <rect class=nj-jsonview-heap x=578 y=146 width=92 height=34 rx=5 /> <path class=nj-jsonview-sep d="M624 146 V180"/> <text class=nj-jsonview-mono x=601 y=168 text-anchor=middle xml:space=preserve>json</text> <text class=nj-jsonview-mono x=647 y=168 text-anchor=middle xml:space=preserve>json</text> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M601 146 C601 130 641 130 706 130"/> <path class="nj-jsonview-arr nj-jsonview-c-line" marker-end=url(#jvl-line) d="M647 180 C647 196 687 196 706 196"/> <rect class=nj-jsonview-heap x=708 y=113 width=126 height=34 rx=5 /> <text class="nj-jsonview-mono nj-jsonview-sm nj-jsonview-c-str" x=771 y=135 text-anchor=middle xml:space=preserve>std::string eu</text> <rect class=nj-jsonview-heap x=708 y=179 width=126 height=34 rx=5 /> <text class="nj-jsonview-mono nj-jsonview-sm nj-jsonview-c-str" x=771 y=201 text-anchor=middle xml:space=preserve>std::string a&quot;b</text> <rect class=nj-jsonview-heap x=16 y=186 width=18 height=14 rx=3 /> <text class=nj-jsonview-note x=42 y=198 xml:space=preserve>a separate heap allocation</text> <path class=nj-jsonview-sep d="M16 234 H824"/> <text class=nj-jsonview-h x=16 y=262 xml:space=preserve>json_document::parse(): the source text stays where it is; one flat index of 16-byte nodes</text> <text class=nj-jsonview-note x=16 y=290 xml:space=preserve>source text, 54 bytes (borrowed, or owned by the document)</text> <rect class=nj-jsonview-ribbon x=42 y=300 width=756 height=26 rx=4 /> <rect x=71 y=302 width=54 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-key"/> <rect x=169 y=302 width=54 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-num"/> <rect x=267 y=302 width=68 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-key"/> <rect x=379 y=302 width=68 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-num"/> <rect x=491 y=302 width=54 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-key"/> <rect x=617 y=302 width=26 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-str"/> <rect x=701 y=302 width=54 height=22 rx=3 class="nj-jsonview-span nj-jsonview-c-dec"/> <text class="nj-jsonview-mono nj-jsonview-byte" x=49 y=317.5 text-anchor=middle xml:space=preserve>{</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=63 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=77 y=317.5 text-anchor=middle xml:space=preserve>p</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=91 y=317.5 text-anchor=middle xml:space=preserve>o</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=105 y=317.5 text-anchor=middle xml:space=preserve>r</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=119 y=317.5 text-anchor=middle xml:space=preserve>t</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=133 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=147 y=317.5 text-anchor=middle xml:space=preserve>:</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=175 y=317.5 text-anchor=middle xml:space=preserve>6</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=189 y=317.5 text-anchor=middle xml:space=preserve>3</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=203 y=317.5 text-anchor=middle xml:space=preserve>7</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=217 y=317.5 text-anchor=middle xml:space=preserve>9</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=231 y=317.5 text-anchor=middle xml:space=preserve>,</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=259 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=273 y=317.5 text-anchor=middle xml:space=preserve>p</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=287 y=317.5 text-anchor=middle xml:space=preserve>r</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=301 y=317.5 text-anchor=middle xml:space=preserve>i</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=315 y=317.5 text-anchor=middle xml:space=preserve>c</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=329 y=317.5 text-anchor=middle xml:space=preserve>e</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=343 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=357 y=317.5 text-anchor=middle xml:space=preserve>:</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=385 y=317.5 text-anchor=middle xml:space=preserve>1</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=399 y=317.5 text-anchor=middle xml:space=preserve>9</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=413 y=317.5 text-anchor=middle xml:space=preserve>.</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=427 y=317.5 text-anchor=middle xml:space=preserve>9</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=441 y=317.5 text-anchor=middle xml:space=preserve>0</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=455 y=317.5 text-anchor=middle xml:space=preserve>,</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=483 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=497 y=317.5 text-anchor=middle xml:space=preserve>t</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=511 y=317.5 text-anchor=middle xml:space=preserve>a</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=525 y=317.5 text-anchor=middle xml:space=preserve>g</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=539 y=317.5 text-anchor=middle xml:space=preserve>s</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=553 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=567 y=317.5 text-anchor=middle xml:space=preserve>:</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=595 y=317.5 text-anchor=middle xml:space=preserve>[</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=609 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=623 y=317.5 text-anchor=middle xml:space=preserve>e</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=637 y=317.5 text-anchor=middle xml:space=preserve>u</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=651 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=665 y=317.5 text-anchor=middle xml:space=preserve>,</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=693 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=707 y=317.5 text-anchor=middle xml:space=preserve>a</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=721 y=317.5 text-anchor=middle xml:space=preserve>\</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=735 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=749 y=317.5 text-anchor=middle xml:space=preserve>b</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=763 y=317.5 text-anchor=middle xml:space=preserve>&quot;</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=777 y=317.5 text-anchor=middle xml:space=preserve>]</text> <text class="nj-jsonview-mono nj-jsonview-byte" x=791 y=317.5 text-anchor=middle xml:space=preserve>}</text> <text class=nj-jsonview-tiny x=49 y=340 text-anchor=middle xml:space=preserve>0</text> <text class=nj-jsonview-tiny x=189 y=340 text-anchor=middle xml:space=preserve>10</text> <text class=nj-jsonview-tiny x=329 y=340 text-anchor=middle xml:space=preserve>20</text> <text class=nj-jsonview-tiny x=469 y=340 text-anchor=middle xml:space=preserve>30</text> <text class=nj-jsonview-tiny x=609 y=340 text-anchor=middle xml:space=preserve>40</text> <text class=nj-jsonview-tiny x=749 y=340 text-anchor=middle xml:space=preserve>50</text> <rect class=nj-jsonview-frame x=16 y=366 width=808 height=254 rx=10 /> <text class="nj-jsonview-note nj-jsonview-strong" x=30 y=602 xml:space=preserve>json_document: owns the node index and the buffer of decoded strings</text> <text class=nj-jsonview-note x=30 y=500 xml:space=preserve>node index: 9 nodes × 16 bytes = 144 bytes, in document order</text> <rect x=36 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-struct"/> <text class=nj-jsonview-tiny x=42 y=420 xml:space=preserve>0</text> <text class="nj-jsonview-kind nj-jsonview-c-struct" x=78 y=434 text-anchor=middle xml:space=preserve>object</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=78 y=451 text-anchor=middle xml:space=preserve>len 3</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=78 y=465 text-anchor=middle xml:space=preserve>next 9</text> <rect x=124 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-key"/> <text class=nj-jsonview-tiny x=130 y=420 xml:space=preserve>1</text> <text class="nj-jsonview-kind nj-jsonview-c-key" x=166 y=434 text-anchor=middle xml:space=preserve>key</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=166 y=451 text-anchor=middle xml:space=preserve>off 2</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=166 y=465 text-anchor=middle xml:space=preserve>len 4</text> <path class="nj-jsonview-arr nj-jsonview-c-key" marker-end=url(#jvl-key) d="M166 406 C166 367 98 367 98 328"/> <rect x=212 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-num"/> <text class=nj-jsonview-tiny x=218 y=420 xml:space=preserve>2</text> <text class="nj-jsonview-kind nj-jsonview-c-num" x=254 y=434 text-anchor=middle xml:space=preserve>uint</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=254 y=451 text-anchor=middle xml:space=preserve>6379</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=254 y=465 text-anchor=middle xml:space=preserve>(converted)</text> <rect x=300 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-key"/> <text class=nj-jsonview-tiny x=306 y=420 xml:space=preserve>3</text> <text class="nj-jsonview-kind nj-jsonview-c-key" x=342 y=434 text-anchor=middle xml:space=preserve>key</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=342 y=451 text-anchor=middle xml:space=preserve>off 16</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=342 y=465 text-anchor=middle xml:space=preserve>len 5</text> <path class="nj-jsonview-arr nj-jsonview-c-key" marker-end=url(#jvl-key) d="M342 406 C342 367 301 367 301 328"/> <rect x=388 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-num"/> <text class=nj-jsonview-tiny x=394 y=420 xml:space=preserve>4</text> <text class="nj-jsonview-kind nj-jsonview-c-num" x=430 y=434 text-anchor=middle xml:space=preserve>float</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=430 y=451 text-anchor=middle xml:space=preserve>off 24</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=430 y=465 text-anchor=middle xml:space=preserve>len 5</text> <path class="nj-jsonview-arr nj-jsonview-c-num" marker-end=url(#jvl-num) d="M430 406 C430 367 413 367 413 328"/> <rect x=476 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-key"/> <text class=nj-jsonview-tiny x=482 y=420 xml:space=preserve>5</text> <text class="nj-jsonview-kind nj-jsonview-c-key" x=518 y=434 text-anchor=middle xml:space=preserve>key</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=518 y=451 text-anchor=middle xml:space=preserve>off 32</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=518 y=465 text-anchor=middle xml:space=preserve>len 4</text> <path class="nj-jsonview-arr nj-jsonview-c-key" marker-end=url(#jvl-key) d="M518 406 C518 367 518 367 518 328"/> <rect x=564 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-struct"/> <text class=nj-jsonview-tiny x=570 y=420 xml:space=preserve>6</text> <text class="nj-jsonview-kind nj-jsonview-c-struct" x=606 y=434 text-anchor=middle xml:space=preserve>array</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=606 y=451 text-anchor=middle xml:space=preserve>len 2</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=606 y=465 text-anchor=middle xml:space=preserve>next 3</text> <rect x=652 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-str"/> <text class=nj-jsonview-tiny x=658 y=420 xml:space=preserve>7</text> <text class="nj-jsonview-kind nj-jsonview-c-str" x=694 y=434 text-anchor=middle xml:space=preserve>string</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=694 y=451 text-anchor=middle xml:space=preserve>off 41</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=694 y=465 text-anchor=middle xml:space=preserve>len 2</text> <path class="nj-jsonview-arr nj-jsonview-c-str" marker-end=url(#jvl-str) d="M694 406 C694 367 630 367 630 328"/> <rect x=740 y=406 width=84 height=68 rx=5 class="nj-jsonview-node nj-jsonview-c-dec"/> <text class=nj-jsonview-tiny x=746 y=420 xml:space=preserve>8</text> <text class="nj-jsonview-kind nj-jsonview-c-dec" x=782 y=434 text-anchor=middle xml:space=preserve>string</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=782 y=451 text-anchor=middle xml:space=preserve>escaped</text> <text class="nj-jsonview-mono nj-jsonview-xs" x=782 y=465 text-anchor=middle xml:space=preserve>len 3</text> <text class=nj-jsonview-note x=773 y=568 text-anchor=middle xml:space=preserve>decoded strings</text> <rect x=740 y=518 width=66 height=30 rx=4 class="nj-jsonview-node nj-jsonview-c-dec"/> <text class=nj-jsonview-mono x=751 y=538 text-anchor=middle xml:space=preserve>a</text> <text class=nj-jsonview-mono x=773 y=538 text-anchor=middle xml:space=preserve>&quot;</text> <text class=nj-jsonview-mono x=795 y=538 text-anchor=middle xml:space=preserve>b</text> <path class="nj-jsonview-arr nj-jsonview-c-dec" marker-end=url(#jvl-dec) d="M782 474 C782 496 773 496 773 518"/> <text class="nj-jsonview-mono nj-jsonview-sm" x=470 y=670 text-anchor=end xml:space=preserve>json_view v = doc.root()[&quot;tags&quot;]</text> <rect x=480 y=648 width=140 height=34 rx=6 class="nj-jsonview-node nj-jsonview-c-struct"/> <path class=nj-jsonview-sep d="M550 648 V682"/> <text class=nj-jsonview-mono x=515 y=670 text-anchor=middle xml:space=preserve>doc*</text> <text class=nj-jsonview-mono x=585 y=670 text-anchor=middle xml:space=preserve>node*</text> <path class="nj-jsonview-arr nj-jsonview-c-struct" marker-end=url(#jvl-struct) d="M515 648 L515 622"/> <path class="nj-jsonview-arr nj-jsonview-c-struct" marker-end=url(#jvl-struct) d="M585 648 C585 561 606 561 606 474"/> <text class=nj-jsonview-note x=30 y=524 xml:space=preserve>integers are converted while parsing and kept in their node;</text> <text class=nj-jsonview-note x=30 y=542 xml:space=preserve>floats and strings point back into the text</text> </svg></p> </div> <p class=nj-caption>Top: the tree of separate heap allocations that <code>basic_json::parse()</code> builds. Bottom: <code>json_document::parse()</code> keeps the source text and builds one flat index of 16-byte nodes that point back into it, plus a buffer of decoded strings.</p> <h2 id=how-to-use-it>How to use it<a class=headerlink href=#how-to-use-it title="Permanent link">&para;</a></h2> <p>Include <code>&lt;nlohmann/json_view.hpp&gt;</code> in addition to (or instead of) <code>&lt;nlohmann/json.hpp&gt;</code>. Parse into a <a href=../../api/json_document/ ><code>json_document</code></a>, inspect its <a href=../../api/basic_json_document/root/ ><code>root()</code></a>, and <code>materialize()</code> when you need a real value. <code>materialize()</code> works on any view, not just the root, so you can turn just the subtree you need into a value:</p> <details class=example> <summary>Example: parse a document, inspect its root, and materialize it</summary> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json_view.hpp&gt;</span>
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json_document</span><span class=p>;</span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
<span class=p>{</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>boolalpha</span><span class=p>;</span>
<span class=w> </span><span class=c1>// json_document is basic_json_document&lt;nlohmann::json&gt;: same value types</span>
<span class=w> </span><span class=c1>// and containers as the ordinary json specialization</span>
<span class=w> </span><span class=n>json_document</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json_document</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{"pi": 3.14, "numbers": [1, 2, 3]}</span><span class=dl>)</span><span class=s>"</span><span class=p>);</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>().</span><span class=n>is_object</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>().</span><span class=n>materialize</span><span class=p>().</span><span class=n>dump</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=p>}</span>
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=kc>true</span>
<span class=p>{</span><span class=nt>"numbers"</span><span class=p>:[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>],</span><span class=nt>"pi"</span><span class=p>:</span><span class=mf>3.14</span><span class=p>}</span>
</code></pre></div> </details> <p><a href=../../api/ordered_json_document/ ><code>ordered_json_document</code></a> is the equivalent for <a href=../../api/ordered_json/ ><code>ordered_json</code></a>, just as <a href=../../api/ordered_json/ ><code>ordered_json</code></a> is to <a href=../../api/json/ ><code>json</code></a>.</p> <p>A view behaves like a <code>basic_json</code> value in most respects, but not in all: lookups of a repeated key, the order in which an object's members are visited, and what a missing key does to chained <code>operator[]</code> are the most visible differences. <a href=differences/ >Differences from <code>basic_json</code></a> lists all of them.</p> <h2 id=where-to-go-next>Where to go next<a class=headerlink href=#where-to-go-next title="Permanent link">&para;</a></h2> <ul> <li><a href=lifetime/ >Ownership and lifetime</a> - when a document borrows its source text, and how long a view stays valid</li> <li><a href=differences/ >Differences from <code>basic_json</code></a> - everything a view does differently from a parsed <code>basic_json</code> value</li> <li><a href=reading/ >Reading values</a> - converting with <code>get&lt;T&gt;()</code>, reading strings and numbers without copying, and writing a view back with <code>dump()</code></li> <li><a href=generic_code/ >Writing generic code</a> - functions and <code>from_json()</code> overloads that accept views</li> <li><a href=editing/ >Editing a document</a> - patching a document in place, keeping its member order and number spellings</li> <li><a href=images/ >Images</a> - saving a parsed document and loading it back without parsing</li> </ul> <h2 id=choosing-between-json-ordered_json-the-sax-interface-and-json_view>Choosing between <code>json</code>, <code>ordered_json</code>, the <abbr title="Simple API for XML">SAX</abbr> interface, and <code>json_view</code><a class=headerlink href=#choosing-between-json-ordered_json-the-sax-interface-and-json_view title="Permanent link">&para;</a></h2> <table> <thead> <tr> <th></th> <th><a href=../../api/json/ ><code>json</code></a> / <a href=../../api/ordered_json/ ><code>ordered_json</code></a></th> <th><a href=../parsing/sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> interface</a></th> <th><a href=../../api/json_document/ ><code>json_document</code></a> / <a href=../../api/json_view/ ><code>json_view</code></a></th> <th><a href=../../api/json_editable_document/ ><code>json_editable_document</code></a> / <a href=../../api/json_editable_view/ ><code>json_editable_view</code></a></th> </tr> </thead> <tbody> <tr> <td><strong>Ownership</strong></td> <td>owns every value</td> <td>owns nothing; you decide what to keep, in your handler</td> <td>borrows or owns the <em>text</em>; the index is always owned by the document</td> <td>same as <code>json_document</code>; edits go to storage the document owns</td> </tr> <tr> <td><strong>Mutability</strong></td> <td>freely mutable</td> <td>not applicable (a one-shot event stream)</td> <td>read-only</td> <td><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>/<a href=../../api/basic_json_document/erase/ ><code>erase</code></a> edit in place; the source text is never rewritten</td> </tr> <tr> <td><strong>What you get</strong></td> <td>a full tree you can read, write, and keep as long as you like</td> <td>a sequence of callbacks; whatever your handler builds from them</td> <td>a flat index plus, on demand, <a href=../../api/basic_json_view/materialize/ ><code>materialize()</code></a>d <code>json</code>/<code>ordered_json</code> values for the parts you actually use</td> <td>the same, plus <a href=../../api/basic_json_view/dump/ ><code>dump()</code></a> of an edited document that keeps the member order and, with <a href=../../api/basic_json_view/number_format/ ><code>number_format::source</code></a>, the spelling of every untouched number</td> </tr> <tr> <td><strong>Typical use</strong></td> <td>general-purpose <abbr title="JavaScript Object Notation">JSON</abbr> handling: config, request/response bodies you build or modify, anything you hold onto</td> <td>validating or projecting a text into your own data structure without ever holding the whole thing as <abbr title="JavaScript Object Notation">JSON</abbr></td> <td>large or high-volume input where you only need part of it, or need it repeatedly, and can keep the source text (or a copy) alive for as long as the document lives</td> <td>a document you read, patch a few fields of, and write back — a configuration file, for instance — where the rest of it should come back exactly as it was</td> </tr> <tr> <td><strong>Caching/reload</strong></td> <td>not applicable — re-parse, or roll your own serialization</td> <td>not applicable</td> <td><a href=../../api/basic_json_document/save/ ><code>save()</code></a>/<a href=../../api/basic_json_document/load/ ><code>load()</code></a>: cache the parsed index as an <a href=images/ >image</a> and reload it without parsing</td> <td>same, saving the document's current — possibly edited — state</td> </tr> </tbody> </table> <p class=nj-table-caption>Each column is one way to work with <abbr title="JavaScript Object Notation">JSON</abbr> in this library, and each row compares one property of them.</p> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> - the document that owns the parsed index (parse, access, images, edits)</li> <li><a href=../../api/basic_json_view/ ><code>basic_json_view</code></a> - the non-owning handle to a value in a document</li> <li><a href=../../api/json_document/ ><code>json_document</code></a> - and <a href=../../api/ordered_json_document/ ><code>ordered_json_document</code></a> - the read-only documents</li> <li><a href=../../api/json_editable_document/ ><code>json_editable_document</code></a> - and <a href=../../api/ordered_json_editable_document/ ><code>ordered_json_editable_document</code></a> - the documents that can be edited in place</li> <li><a href=../../home/architecture/#node-index-of-json-views>Architecture</a> - the layout of the node index</li> <li><a href=../parsing/sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> interface</a> - event-based parsing without building a tree</li> <li><a href=../performance/ >Performance</a> - benchmarks and tuning of parsing and serialization</li> <li><a href=../parsing/large_and_partial_input/ >Large, Streamed, and Partial Input</a> - 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