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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href=https://json.nlohmann.me/api/basic_json/patch_inplace/ rel=canonical><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>patch_inplace - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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md-nav__item--active md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_1 type=checkbox id=__nav_4_1 checked> <div class="md-nav__link md-nav__link--index "> <a href=../ >basic_json</a> <label for=__nav_4_1> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=basic_json data-md-level=2> <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=../basic_json/ class=md-nav__link> (Constructor) </a> </li> <li class=md-nav__item> <a href=../~basic_json/ class=md-nav__link> (Destructor) </a> </li> <li class=md-nav__item> <a href=../accept/ class=md-nav__link> accept </a> </li> <li class=md-nav__item> <a href=../array/ class=md-nav__link> array </a> </li> <li class=md-nav__item> <a href=../array_t/ class=md-nav__link> array_t </a> </li> <li class=md-nav__item> <a href=../at/ class=md-nav__link> at </a> </li> <li class=md-nav__item> <a href=../back/ class=md-nav__link> back </a> </li> <li class=md-nav__item> <a href=../begin/ class=md-nav__link> begin </a> </li> <li class=md-nav__item> <a href=../binary/ class=md-nav__link> binary </a> </li> <li class=md-nav__item> <a href=../binary_t/ class=md-nav__link> binary_t </a> </li> <li class=md-nav__item> <a href=../boolean_t/ class=md-nav__link> boolean_t </a> </li> <li class=md-nav__item> <a href=../cbegin/ class=md-nav__link> cbegin </a> </li> <li class=md-nav__item> <a href=../cbor_tag_handler_t/ class=md-nav__link> cbor_tag_handler_t </a> </li> <li class=md-nav__item> <a href=../cend/ class=md-nav__link> cend </a> </li> <li class=md-nav__item> <a href=../clear/ class=md-nav__link> clear </a> </li> <li class=md-nav__item> <a href=../contains/ class=md-nav__link> contains </a> </li> <li class=md-nav__item> <a href=../count/ class=md-nav__link> count </a> </li> <li class=md-nav__item> <a href=../crbegin/ class=md-nav__link> crbegin </a> </li> <li class=md-nav__item> <a href=../crend/ class=md-nav__link> crend </a> </li> <li class=md-nav__item> <a href=../default_object_comparator_t/ class=md-nav__link> default_object_comparator_t </a> </li> <li class=md-nav__item> <a href=../diff/ class=md-nav__link> diff </a> </li> <li class=md-nav__item> <a href=../dump/ class=md-nav__link> dump </a> </li> <li class=md-nav__item> <a href=../emplace/ class=md-nav__link> emplace </a> </li> <li class=md-nav__item> <a href=../emplace_back/ class=md-nav__link> emplace_back </a> </li> <li class=md-nav__item> <a href=../empty/ class=md-nav__link> empty </a> </li> <li class=md-nav__item> <a href=../end/ class=md-nav__link> end </a> </li> <li class=md-nav__item> <a href=../erase/ class=md-nav__link> erase </a> </li> <li class=md-nav__item> <a href=../error_handler_t/ class=md-nav__link> error_handler_t </a> </li> <li class=md-nav__item> <a href=../exception/ class=md-nav__link> exception </a> </li> <li class=md-nav__item> <a href=../find/ class=md-nav__link> find </a> </li> <li class=md-nav__item> <a href=../flatten/ class=md-nav__link> flatten </a> </li> <li class=md-nav__item> <a href=../from_bjdata/ class=md-nav__link> from_bjdata </a> </li> <li class=md-nav__item> <a href=../from_bson/ class=md-nav__link> from_bson </a> </li> <li class=md-nav__item> <a href=../from_cbor/ class=md-nav__link> from_cbor </a> </li> <li class=md-nav__item> <a href=../from_msgpack/ class=md-nav__link> from_msgpack </a> </li> <li class=md-nav__item> <a href=../from_ubjson/ class=md-nav__link> from_ubjson </a> </li> <li class=md-nav__item> <a href=../front/ class=md-nav__link> front </a> </li> <li class=md-nav__item> <a href=../get/ class=md-nav__link> get </a> </li> <li class=md-nav__item> <a href=../get_allocator/ class=md-nav__link> get_allocator </a> </li> <li class=md-nav__item> <a href=../get_binary/ class=md-nav__link> get_binary </a> </li> <li class=md-nav__item> <a href=../get_ptr/ class=md-nav__link> get_ptr </a> </li> <li class=md-nav__item> <a href=../get_ref/ class=md-nav__link> get_ref </a> </li> <li class=md-nav__item> <a href=../get_to/ class=md-nav__link> get_to </a> </li> <li class=md-nav__item> <a href=../std_hash/ class=md-nav__link> std::hash&lt;basic_json&gt; </a> </li> <li class=md-nav__item> <a href=../input_format_t/ class=md-nav__link> input_format_t </a> </li> <li class=md-nav__item> <a href=../insert/ class=md-nav__link> insert </a> </li> <li class=md-nav__item> <a href=../invalid_iterator/ class=md-nav__link> invalid_iterator </a> </li> <li class=md-nav__item> <a href=../is_array/ class=md-nav__link> is_array </a> </li> <li class=md-nav__item> <a href=../is_binary/ class=md-nav__link> is_binary </a> </li> <li class=md-nav__item> <a href=../is_boolean/ class=md-nav__link> is_boolean </a> </li> <li class=md-nav__item> <a href=../is_discarded/ class=md-nav__link> is_discarded </a> </li> <li class=md-nav__item> <a href=../is_null/ class=md-nav__link> is_null </a> </li> <li class=md-nav__item> <a href=../is_number/ class=md-nav__link> is_number </a> </li> <li class=md-nav__item> <a href=../is_number_float/ class=md-nav__link> is_number_float </a> </li> <li class=md-nav__item> <a href=../is_number_integer/ class=md-nav__link> is_number_integer </a> </li> <li class=md-nav__item> <a href=../is_number_unsigned/ class=md-nav__link> is_number_unsigned </a> </li> <li class=md-nav__item> <a href=../is_object/ class=md-nav__link> is_object </a> </li> <li class=md-nav__item> <a href=../is_primitive/ class=md-nav__link> is_primitive </a> </li> <li class=md-nav__item> <a href=../is_string/ class=md-nav__link> is_string </a> </li> <li class=md-nav__item> <a href=../is_structured/ class=md-nav__link> is_structured </a> </li> <li class=md-nav__item> <a href=../items/ class=md-nav__link> items </a> </li> <li class=md-nav__item> <a href=../json_base_class_t/ class=md-nav__link> json_base_class_t </a> </li> <li class=md-nav__item> <a href=../json_serializer/ class=md-nav__link> json_serializer </a> </li> <li class=md-nav__item> <a href=../max_size/ class=md-nav__link> max_size </a> </li> <li class=md-nav__item> <a href=../meta/ class=md-nav__link> meta </a> </li> <li class=md-nav__item> <a href=../merge_patch/ class=md-nav__link> merge_patch </a> </li> <li class=md-nav__item> <a href=../number_float_t/ class=md-nav__link> number_float_t </a> </li> <li class=md-nav__item> <a href=../number_integer_t/ class=md-nav__link> number_integer_t </a> </li> <li class=md-nav__item> <a href=../number_unsigned_t/ class=md-nav__link> number_unsigned_t </a> </li> <li class=md-nav__item> <a href=../object/ class=md-nav__link> object </a> </li> <li class=md-nav__item> <a href=../object_comparator_t/ class=md-nav__link> object_comparator_t </a> </li> <li class=md-nav__item> <a href=../object_t/ class=md-nav__link> object_t </a> </li> <li class=md-nav__item> <a href=../operator_ValueType/ class=md-nav__link> operator ValueType </a> </li> <li class=md-nav__item> <a href=../operator_value_t/ class=md-nav__link> operator value_t </a> </li> <li class=md-nav__item> <a href=../operator%5B%5D/ class=md-nav__link> operator[] </a> </li> <li class=md-nav__item> <a href=../operator%3D/ class=md-nav__link> operator= </a> </li> <li class=md-nav__item> <a href=../operator%2B%3D/ class=md-nav__link> operator+= </a> </li> <li class=md-nav__item> <a href=../operator_eq/ class=md-nav__link> operator== </a> </li> <li class=md-nav__item> <a href=../operator_ne/ class=md-nav__link> operator!= </a> </li> <li class=md-nav__item> <a href=../operator_lt/ class=md-nav__link> operator< </a> </li> <li class=md-nav__item> <a href=../operator_gt/ class=md-nav__link> operator> </a> </li> <li class=md-nav__item> <a href=../operator_le/ class=md-nav__link> operator<= </a> </li> <li class=md-nav__item> <a href=../operator_ge/ class=md-nav__link> operator>= </a> </li> <li class=md-nav__item> <a href=../operator_spaceship/ class=md-nav__link> operator<=> </a> </li> <li class=md-nav__item> <a href=../out_of_range/ class=md-nav__link> out_of_range </a> </li> <li class=md-nav__item> <a href=../other_error/ class=md-nav__link> other_error </a> </li> <li class=md-nav__item> <a href=../parse/ class=md-nav__link> parse </a> </li> <li class=md-nav__item> <a href=../parse_error/ class=md-nav__link> parse_error </a> </li> <li class=md-nav__item> <a href=../parse_event_t/ class=md-nav__link> parse_event_t </a> </li> <li class=md-nav__item> <a href=../parser_callback_t/ class=md-nav__link> parser_callback_t </a> </li> <li class=md-nav__item> <a href=../patch/ class=md-nav__link> patch </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" data-md-toggle=toc type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> patch_inplace <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> patch_inplace </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#parameters class=md-nav__link> Parameters </a> </li> <li class=md-nav__item> <a href=#exception-safety class=md-nav__link> Exception safety </a> </li> <li class=md-nav__item> <a href=#exceptions class=md-nav__link> Exceptions </a> </li> <li class=md-nav__item> <a href=#complexity class=md-nav__link> Complexity </a> </li> <li class=md-nav__item> <a href=#notes class=md-nav__link> Notes </a> </li> <li class=md-nav__item> <a href=#examples class=md-nav__link> Examples </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> See also </a> </li> <li class=md-nav__item> <a href=#version-history class=md-nav__link> Version history </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../push_back/ class=md-nav__link> push_back </a> </li> <li class=md-nav__item> <a href=../rbegin/ class=md-nav__link> rbegin </a> </li> <li class=md-nav__item> <a href=../rend/ class=md-nav__link> rend </a> </li> <li class=md-nav__item> <a href=../sax_parse/ class=md-nav__link> sax_parse </a> </li> <li class=md-nav__item> <a href=../size/ class=md-nav__link> size </a> </li> <li class=md-nav__item> <a href=../string_t/ class=md-nav__link> string_t </a> </li> <li class=md-nav__item> <a href=../swap/ class=md-nav__link> swap </a> </li> <li class=md-nav__item> <a href=../std_swap/ class=md-nav__link> std::swap&lt;basic_json&gt; </a> </li> <li class=md-nav__item> <a href=../to_bjdata/ class=md-nav__link> to_bjdata </a> </li> <li class=md-nav__item> <a href=../to_bson/ class=md-nav__link> to_bson </a> </li> <li class=md-nav__item> <a href=../to_cbor/ class=md-nav__link> to_cbor </a> </li> <li class=md-nav__item> <a href=../to_msgpack/ class=md-nav__link> to_msgpack </a> </li> <li class=md-nav__item> <a href=../to_string/ class=md-nav__link> to_string </a> </li> <li class=md-nav__item> <a href=../to_ubjson/ class=md-nav__link> to_ubjson </a> </li> <li class=md-nav__item> <a href=../type/ class=md-nav__link> type </a> </li> <li class=md-nav__item> <a href=../type_error/ class=md-nav__link> type_error </a> </li> <li class=md-nav__item> <a href=../type_name/ class=md-nav__link> type_name </a> </li> <li class=md-nav__item> <a href=../unflatten/ class=md-nav__link> unflatten </a> </li> <li class=md-nav__item> <a href=../update/ class=md-nav__link> update </a> </li> <li class=md-nav__item> <a href=../value/ class=md-nav__link> value </a> </li> <li class=md-nav__item> <a href=../value_t/ class=md-nav__link> value_t </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_2 type=checkbox id=__nav_4_2> <div class="md-nav__link md-nav__link--index "> <a href=../../byte_container_with_subtype/ >byte_container_with_subtype</a> <label for=__nav_4_2> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=byte_container_with_subtype data-md-level=2> <label class=md-nav__title for=__nav_4_2> <span class="md-nav__icon md-icon"></span> byte_container_with_subtype </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../byte_container_with_subtype/byte_container_with_subtype/ class=md-nav__link> (constructor) </a> </li> <li class=md-nav__item> <a href=../../byte_container_with_subtype/clear_subtype/ class=md-nav__link> clear_subtype </a> </li> <li class=md-nav__item> <a href=../../byte_container_with_subtype/has_subtype/ class=md-nav__link> has_subtype </a> </li> <li class=md-nav__item> <a href=../../byte_container_with_subtype/set_subtype/ class=md-nav__link> set_subtype </a> </li> <li class=md-nav__item> <a href=../../byte_container_with_subtype/subtype/ class=md-nav__link> subtype </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_3 type=checkbox id=__nav_4_3> <div class="md-nav__link md-nav__link--index "> <a href=../../adl_serializer/ >adl_serializer</a> <label for=__nav_4_3> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=adl_serializer data-md-level=2> <label class=md-nav__title for=__nav_4_3> <span class="md-nav__icon md-icon"></span> adl_serializer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../adl_serializer/from_json/ class=md-nav__link> from_json </a> </li> <li class=md-nav__item> <a href=../../adl_serializer/to_json/ class=md-nav__link> to_json </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../json/ class=md-nav__link> json </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_5 type=checkbox id=__nav_4_5> <div class="md-nav__link md-nav__link--index "> <a href=../../json_pointer/ >json_pointer</a> <label for=__nav_4_5> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=json_pointer data-md-level=2> <label class=md-nav__title for=__nav_4_5> <span class="md-nav__icon md-icon"></span> json_pointer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../json_pointer/json_pointer/ class=md-nav__link> (Constructor) </a> </li> <li class=md-nav__item> <a href=../../json_pointer/back/ class=md-nav__link> back </a> </li> <li class=md-nav__item> <a href=../../json_pointer/empty/ class=md-nav__link> empty </a> </li> <li class=md-nav__item> <a href=../../json_pointer/operator_string_t/ class=md-nav__link> operator string_t </a> </li> <li class=md-nav__item> <a href=../../json_pointer/operator_eq/ class=md-nav__link> operator== </a> </li> <li class=md-nav__item> <a href=../../json_pointer/operator_ne/ class=md-nav__link> operator!= </a> </li> <li class=md-nav__item> <a href=../../json_pointer/operator_slash/ class=md-nav__link> operator/ </a> </li> <li class=md-nav__item> <a href=../../json_pointer/operator_slasheq/ class=md-nav__link> operator/= </a> </li> <li class=md-nav__item> <a href=../../json_pointer/parent_pointer/ class=md-nav__link> parent_pointer </a> </li> <li class=md-nav__item> <a href=../../json_pointer/pop_back/ class=md-nav__link> pop_back </a> </li> <li class=md-nav__item> <a href=../../json_pointer/push_back/ class=md-nav__link> push_back </a> </li> <li class=md-nav__item> <a href=../../json_pointer/string_t/ class=md-nav__link> string_t </a> </li> <li class=md-nav__item> <a href=../../json_pointer/to_string/ class=md-nav__link> to_string </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_6 type=checkbox id=__nav_4_6> <div class="md-nav__link md-nav__link--index "> <a href=../../json_sax/ >json_sax</a> <label for=__nav_4_6> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=json_sax data-md-level=2> <label class=md-nav__title for=__nav_4_6> <span class="md-nav__icon md-icon"></span> json_sax </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../json_sax/binary/ class=md-nav__link> binary </a> </li> <li class=md-nav__item> <a href=../../json_sax/boolean/ class=md-nav__link> boolean </a> </li> <li class=md-nav__item> <a href=../../json_sax/end_array/ class=md-nav__link> end_array </a> </li> <li class=md-nav__item> <a href=../../json_sax/end_object/ class=md-nav__link> end_object </a> </li> <li class=md-nav__item> <a href=../../json_sax/key/ class=md-nav__link> key </a> </li> <li class=md-nav__item> <a href=../../json_sax/null/ class=md-nav__link> null </a> </li> <li class=md-nav__item> <a href=../../json_sax/number_float/ class=md-nav__link> number_float </a> </li> <li class=md-nav__item> <a href=../../json_sax/number_integer/ class=md-nav__link> number_integer </a> </li> <li class=md-nav__item> <a href=../../json_sax/number_unsigned/ class=md-nav__link> number_unsigned </a> </li> <li class=md-nav__item> <a href=../../json_sax/parse_error/ class=md-nav__link> parse_error </a> </li> <li class=md-nav__item> <a href=../../json_sax/start_array/ class=md-nav__link> start_array </a> </li> <li class=md-nav__item> <a href=../../json_sax/start_object/ class=md-nav__link> start_object </a> </li> <li class=md-nav__item> <a href=../../json_sax/string/ class=md-nav__link> string </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../operator_ltlt/ class=md-nav__link> operator<<(basic_json) </a> </li> <li class=md-nav__item> <a href=../../operator_ltlt/ class=md-nav__link> operator<<(json_pointer) </a> </li> <li class=md-nav__item> <a href=../../operator_gtgt/ class=md-nav__link> operator>>(basic_json) </a> </li> <li class=md-nav__item> <a href=../../operator_literal_json/ class=md-nav__link> operator""_json </a> </li> <li class=md-nav__item> <a href=../../operator_literal_json_pointer/ class=md-nav__link> operator""_json_pointer </a> </li> <li class=md-nav__item> <a href=../../ordered_json/ class=md-nav__link> ordered_json </a> </li> <li class=md-nav__item> <a href=../../ordered_map/ class=md-nav__link> ordered_map </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_14 type=checkbox id=__nav_4_14> <div class="md-nav__link md-nav__link--index "> <a href=../../macros/ >macros</a> <label for=__nav_4_14> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=macros data-md-level=2> <label class=md-nav__title for=__nav_4_14> <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=../../macros/json_assert/ class=md-nav__link> JSON_ASSERT </a> </li> <li class=md-nav__item> <a href=../../macros/json_throw_user/ class=md-nav__link> JSON_CATCH_USER </a> </li> <li class=md-nav__item> <a href=../../macros/json_diagnostics/ class=md-nav__link> JSON_DIAGNOSTICS </a> </li> <li class=md-nav__item> <a href=../../macros/json_disable_enum_serialization/ class=md-nav__link> JSON_DISABLE_ENUM_SERIALIZATION </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_11 </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_14 </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_17 </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_20 </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_filesystem/ class=md-nav__link> JSON_HAS_EXPERIMENTAL_FILESYSTEM </a> </li> <li class=md-nav__item> <a href=../../macros/json_has_filesystem/ class=md-nav__link> JSON_HAS_FILESYSTEM </a> </li> <li 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href=../../macros/nlohmann_json_version_major/ class=md-nav__link> NLOHMANN_JSON_VERSION_PATCH </a> </li> </ul> </nav> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#parameters class=md-nav__link> Parameters </a> </li> <li class=md-nav__item> <a href=#exception-safety class=md-nav__link> Exception safety </a> </li> <li class=md-nav__item> <a href=#exceptions class=md-nav__link> Exceptions </a> </li> <li class=md-nav__item> <a href=#complexity class=md-nav__link> Complexity </a> </li> <li class=md-nav__item> <a href=#notes class=md-nav__link> Notes </a> </li> <li class=md-nav__item> <a href=#examples class=md-nav__link> Examples </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> See also </a> </li> <li class=md-nav__item> <a href=#version-history class=md-nav__link> Version history </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/api/basic_json/patch_inplace.md title="Edit this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z"/></svg> </a> <h1 id=nlohmannbasic_jsonpatch_inplace><small>nlohmann::basic_json::</small>patch_inplace<a class=headerlink href=#nlohmannbasic_jsonpatch_inplace title="Permanent link">&para;</a></h1> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>patch_inplace</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_json</span><span class=o>&amp;</span><span class=w> </span><span class=n>json_patch</span><span class=p>)</span><span class=w> </span><span class=k>const</span><span class=p>;</span><span class=w></span>
</code></pre></div> <p><a href=http://jsonpatch.com>JSON Patch</a> defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch. This function applies a JSON patch in place and returns void.</p> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">&para;</a></h2> <dl> <dt><code>json_patch</code> (in)</dt> <dd>JSON patch document</dd> </dl> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">&para;</a></h2> <p>No guarantees, value may be corrupted by an unsuccessful patch operation.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">&para;</a></h2> <ul> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error104><code>parse_error.104</code></a> if the JSON patch does not consist of an array of objects.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error105><code>parse_error.105</code></a> if the JSON patch is malformed (e.g., mandatory attributes are missing); example: <code>"operation add must have member path"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range401><code>out_of_range.401</code></a> if an array index is out of range.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range403><code>out_of_range.403</code></a> if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: <code>"key baz not found"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range405><code>out_of_range.405</code></a> if JSON pointer has no parent ("add", "remove", "move")</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionother_error501><code>out_of_range.501</code></a> if "test" operation was unsuccessful.</li> </ul> <h2 id=complexity>Complexity<a class=headerlink href=#complexity title="Permanent link">&para;</a></h2> <p>Linear in the size of the JSON value and the length of the JSON patch. As usually only a fraction of the JSON value is affected by the patch, the complexity can usually be neglected.</p> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">&para;</a></h2> <p>Unlike <a href=../patch/ ><code>patch</code></a>, <code>patch_inplace</code> applies the operation "in place" and no copy of the JSON value is created. That makes it faster for large documents by avoiding the copy. However, the JSON value might be corrupted if the function throws an exception.</p> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">&para;</a></h2> <details class=example> <summary>Example</summary> <p>The following code shows how a JSON patch is applied to a value.</p> <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></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iomanip&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
<span class=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>nlohmann</span><span class=o>::</span><span class=nn>literals</span><span class=p>;</span><span class=w></span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=c1>// the original document</span>
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>&quot;</span><span class=dl>(</span><span class=s></span>
<span class=s> {</span>
<span class=s> &quot;baz&quot;: &quot;qux&quot;,</span>
<span class=s> &quot;foo&quot;: &quot;bar&quot;</span>
<span class=s> }</span>
<span class=s> </span><span class=dl>)</span><span class=s>&quot;</span><span class=n>_json</span><span class=p>;</span><span class=w></span>
<span class=w> </span><span class=c1>// the patch</span>
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>patch</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>&quot;</span><span class=dl>(</span><span class=s></span>
<span class=s> [</span>
<span class=s> { &quot;op&quot;: &quot;replace&quot;, &quot;path&quot;: &quot;/baz&quot;, &quot;value&quot;: &quot;boo&quot; },</span>
<span class=s> { &quot;op&quot;: &quot;add&quot;, &quot;path&quot;: &quot;/hello&quot;, &quot;value&quot;: [&quot;world&quot;] },</span>
<span class=s> { &quot;op&quot;: &quot;remove&quot;, &quot;path&quot;: &quot;/foo&quot;}</span>
<span class=s> ]</span>
<span class=s> </span><span class=dl>)</span><span class=s>&quot;</span><span class=n>_json</span><span class=p>;</span><span class=w></span>
<span class=w> </span><span class=c1>// output original document</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=s>&quot;Before</span><span class=se>\n</span><span class=s>&quot;</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</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>endl</span><span class=p>;</span><span class=w></span>
<span class=w> </span><span class=c1>// apply the patch</span>
<span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>patch_inplace</span><span class=p>(</span><span class=n>patch</span><span class=p>);</span><span class=w></span>
<span class=w> </span><span class=c1>// output patched document</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=s>&quot;</span><span class=se>\n</span><span class=s>After</span><span class=se>\n</span><span class=s>&quot;</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</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>endl</span><span class=p>;</span><span class=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=err>Be</span><span class=kc>f</span><span class=err>ore</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;baz&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;qux&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;foo&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;bar&quot;</span><span class=w></span>
<span class=p>}</span><span class=w></span>
<span class=err>A</span><span class=kc>fter</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;baz&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;boo&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;hello&quot;</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=w></span>
<span class=w> </span><span class=s2>&quot;world&quot;</span><span class=w></span>
<span class=w> </span><span class=p>]</span><span class=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href=https://tools.ietf.org/html/rfc6902>RFC 6902 (JSON Patch)</a></li> <li><a href=https://tools.ietf.org/html/rfc6901>RFC 6901 (JSON Pointer)</a></li> <li><a href=../patch/ >patch</a> applies a JSON Merge Patch</li> <li><a href=../merge_patch/ >merge_patch</a> applies a JSON Merge Patch</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 3.11.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> </div> <a href=# class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../patch/ class="md-footer__link md-footer__link--prev" aria-label="Previous: patch" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> patch </div> </div> </a> <a href=../push_back/ class="md-footer__link md-footer__link--next" aria-label="Next: push_back" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> push_back </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright &copy; 2013 - 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