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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/number_float_t/ rel=canonical><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>number_float_t - 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 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> number_float_t <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> number_float_t </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=#notes class=md-nav__link> Notes </a> <nav class=md-nav aria-label=Notes> <ul class=md-nav__list> <li class=md-nav__item> <a href=#default-type class=md-nav__link> Default type </a> </li> <li class=md-nav__item> <a href=#default-behavior class=md-nav__link> Default behavior </a> </li> <li class=md-nav__item> <a href=#limits class=md-nav__link> Limits </a> </li> <li class=md-nav__item> <a href=#storage class=md-nav__link> Storage </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#examples class=md-nav__link> Examples </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=../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> <a href=../patch_inplace/ class=md-nav__link> patch_inplace </a> </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=#storage class=md-nav__link> Storage </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#examples class=md-nav__link> Examples </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/number_float_t.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_jsonnumber_float_t><small>nlohmann::basic_json::</small>number_float_t<a class=headerlink href=#nlohmannbasic_jsonnumber_float_t title="Permanent link">&para;</a></h1> <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>number_float_t</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>NumberFloatType</span><span class=p>;</span><span class=w></span>
</code></pre></div> <p>The type used to store JSON numbers (floating-point).</p> <p><a href=https://tools.ietf.org/html/rfc8259>RFC 8259</a> describes numbers as follows:</p> <blockquote> <p>The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.</p> </blockquote> <p>This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer or a floating-point number. Therefore, three different types, <a href=../number_integer_t/ ><code>number_integer_t</code></a>, <a href=../number_unsigned_t/ ><code>number_unsigned_t</code></a> and <code>number_float_t</code> are used.</p> <p>To store floating-point numbers in C++, a type is defined by the template parameter <code>NumberFloatType</code> which chooses the type to use.</p> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">&para;</a></h2> <h4 id=default-type>Default type<a class=headerlink href=#default-type title="Permanent link">&para;</a></h4> <p>With the default values for <code>NumberFloatType</code> (<code>double</code>), the default value for <code>number_float_t</code> is <code class=highlight><span class=kt>double</span><span class=w></span></code>.</p> <h4 id=default-behavior>Default behavior<a class=headerlink href=#default-behavior title="Permanent link">&para;</a></h4> <ul> <li>The restrictions about leading zeros is not enforced in C++. Instead, leading zeros in floating-point literals will be ignored. Internally, the value will be stored as decimal number. For instance, the C++ floating-point literal <code>01.2</code> will be serialized to <code>1.2</code>. During deserialization, leading zeros yield an error.</li> <li>Not-a-number (NaN) values will be serialized to <code>null</code>.</li> </ul> <h4 id=limits>Limits<a class=headerlink href=#limits title="Permanent link">&para;</a></h4> <p><a href=https://tools.ietf.org/html/rfc8259>RFC 8259</a> states:</p> <blockquote> <p>This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.</p> </blockquote> <p>This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than <code>-1.79769313486232e+308</code> and values greater than <code>1.79769313486232e+308</code> will be stored as NaN internally and be serialized to <code>null</code>.</p> <h4 id=storage>Storage<a class=headerlink href=#storage title="Permanent link">&para;</a></h4> <p>Floating-point number values are stored directly inside a <code>basic_json</code> type.</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 that <code>number_float_t</code> is by default, a typedef to <code class=highlight><span class=kt>double</span><span class=w></span></code>.</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=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=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=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>is_same</span><span class=o>&lt;</span><span class=kt>double</span><span class=p>,</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>number_float_t</span><span class=o>&gt;::</span><span class=n>value</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=kc>true</span><span class=w></span>
</code></pre></div> </details> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 1.0.0.</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=../merge_patch/ class="md-footer__link md-footer__link--prev" aria-label="Previous: merge_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> merge_patch </div> </div> </a> <a href=../number_integer_t/ class="md-footer__link md-footer__link--next" aria-label="Next: number_integer_t" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> number_integer_t </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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