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\"json.hpp\"\nusing json = nlohmann::json ;\n\nusing namespace std ;\n\nint main(){\n json js = \"asd\" ;\n string s1 = js ;\n //string s2 = (string)js ;\n}\n","codes",[3346],{"_3347":3348,"_3342":3349},"file","json.hpp","/*\n __ _____ _____ _____\n __| | __| | | | JSON for Modern C++\n| | |__ | | | | | | version 2.1.1\n|_____|_____|_____|_|___| https://github.com/nlohmann/json\n\nLicensed under the MIT License .\nCopyright (c) 2013-2017 Niels Lohmann .\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n*/\n\n#ifndef NLOHMANN_JSON_HPP\n#define NLOHMANN_JSON_HPP\n\n#include // all_of, copy, fill, find, for_each, none_of, remove, reverse, transform\n#include // array\n#include // assert\n#include // isdigit\n#include // and, not, or\n#include // lconv, localeconv\n#include // isfinite, labs, ldexp, signbit\n#include // nullptr_t, ptrdiff_t, size_t\n#include // int64_t, uint64_t\n#include // abort, strtod, strtof, strtold, strtoul, strtoll, strtoull\n#include // strlen\n#include // forward_list\n#include // function, hash, less\n#include // initializer_list\n#include // setw\n#include // istream, ostream\n#include // advance, begin, back_inserter, bidirectional_iterator_tag, distance, end, inserter, iterator, iterator_traits, next, random_access_iterator_tag, reverse_iterator\n#include // numeric_limits\n#include // locale\n#include // map\n#include // addressof, allocator, allocator_traits, unique_ptr\n#include // accumulate\n#include // stringstream\n#include // domain_error, invalid_argument, out_of_range\n#include // getline, stoi, string, to_string\n#include // add_pointer, conditional, decay, enable_if, false_type, integral_constant, is_arithmetic, is_base_of, is_const, is_constructible, is_convertible, is_default_constructible, is_enum, is_floating_point, is_integral, is_nothrow_move_assignable, is_nothrow_move_constructible, is_pointer, is_reference, is_same, is_scalar, is_signed, remove_const, remove_cv, remove_pointer, remove_reference, true_type, underlying_type\n#include // declval, forward, make_pair, move, pair, swap\n#include // vector\n\n// exclude unsupported compilers\n#if defined(__clang__)\n #if (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__) < 30400\n #error \"unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers\"\n #endif\n#elif defined(__GNUC__)\n #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40900\n #error \"unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers\"\n #endif\n#endif\n\n// disable float-equal warnings on GCC/clang\n#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)\n #pragma GCC diagnostic push\n #pragma GCC diagnostic ignored \"-Wfloat-equal\"\n#endif\n\n// disable documentation warnings on clang\n#if defined(__clang__)\n #pragma GCC diagnostic push\n #pragma GCC diagnostic ignored \"-Wdocumentation\"\n#endif\n\n// allow to disable exceptions\n#if not defined(JSON_NOEXCEPTION) || defined(__EXCEPTIONS)\n #define JSON_THROW(exception) throw exception\n #define JSON_TRY try\n #define JSON_CATCH(exception) catch(exception)\n#else\n #define JSON_THROW(exception) std::abort()\n #define JSON_TRY if(true)\n #define JSON_CATCH(exception) if(false)\n#endif\n\n/*!\n@brief namespace for Niels Lohmann\n@see https://github.com/nlohmann\n@since version 1.0.0\n*/\nnamespace nlohmann\n{\n\n/*!\n@brief unnamed namespace with internal helper functions\n\nThis namespace collects some functions that could not be defined inside the\n@ref basic_json class.\n\n@since version 2.1.0\n*/\nnamespace detail\n{\n///////////////////////////\n// JSON type enumeration //\n///////////////////////////\n\n/*!\n@brief the JSON type enumeration\n\nThis enumeration collects the different JSON types. It is internally used to\ndistinguish the stored values, and the functions @ref basic_json::is_null(),\n@ref basic_json::is_object(), @ref basic_json::is_array(),\n@ref basic_json::is_string(), @ref basic_json::is_boolean(),\n@ref basic_json::is_number() (with @ref basic_json::is_number_integer(),\n@ref basic_json::is_number_unsigned(), and @ref basic_json::is_number_float()),\n@ref basic_json::is_discarded(), @ref basic_json::is_primitive(), and\n@ref basic_json::is_structured() rely on it.\n\n@note There are three enumeration entries (number_integer, number_unsigned, and\nnumber_float), because the library distinguishes these three types for numbers:\n@ref basic_json::number_unsigned_t is used for unsigned integers,\n@ref basic_json::number_integer_t is used for signed integers, and\n@ref basic_json::number_float_t is used for floating-point numbers or to\napproximate integers which do not fit in the limits of their respective type.\n\n@sa @ref basic_json::basic_json(const value_t value_type) -- create a JSON\nvalue with the default value for a given type\n\n@since version 1.0.0\n*/\nenum class value_t : uint8_t\n{\n null, ///< null value\n object, ///< object (unordered set of name/value pairs)\n array, ///< array (ordered collection of values)\n string, ///< string value\n boolean, ///< boolean value\n number_integer, ///< number value (signed integer)\n number_unsigned, ///< number value (unsigned integer)\n number_float, ///< number value (floating-point)\n discarded ///< discarded by the the parser callback function\n};\n\n/*!\n@brief comparison operator for JSON types\n\nReturns an ordering that is similar to Python:\n- order: null < boolean < number < object < array < string\n- furthermore, each type is not smaller than itself\n\n@since version 1.0.0\n*/\ninline bool operator<(const value_t lhs, const value_t rhs) noexcept\n{\n static constexpr std::array order = {{\n 0, // null\n 3, // object\n 4, // array\n 5, // string\n 1, // boolean\n 2, // integer\n 2, // unsigned\n 2, // float\n }\n };\n\n // discarded values are not comparable\n if (lhs == value_t::discarded or rhs == value_t::discarded)\n {\n return false;\n }\n\n return order[static_cast(lhs)] <\n order[static_cast(rhs)];\n}\n\n\n/////////////\n// helpers //\n/////////////\n\n// alias templates to reduce boilerplate\ntemplate\nusing enable_if_t = typename std::enable_if::type;\n\ntemplate\nusing uncvref_t = typename std::remove_cv::type>::type;\n\n// taken from http://stackoverflow.com/a/26936864/266378\ntemplate\nusing is_unscoped_enum =\n std::integral_constant::value and\n std::is_enum::value>;\n\n/*\nImplementation of two C++17 constructs: conjunction, negation. This is needed\nto avoid evaluating all the traits in a condition\n\nFor example: not std::is_same::value and has_value_type::value\nwill not compile when T = void (on MSVC at least). Whereas\nconjunction>, has_value_type>::value will\nstop evaluating if negation<...>::value == false\n\nPlease note that those constructs must be used with caution, since symbols can\nbecome very long quickly (which can slow down compilation and cause MSVC\ninternal compiler errors). Only use it when you have to (see example ahead).\n*/\ntemplate struct conjunction : std::true_type {};\ntemplate struct conjunction : B1 {};\ntemplate\nstruct conjunction : std::conditional, B1>::type {};\n\ntemplate struct negation : std::integral_constant < bool, !B::value > {};\n\n// dispatch utility (taken from ranges-v3)\ntemplate struct priority_tag : priority_tag < N - 1 > {};\ntemplate<> struct priority_tag<0> {};\n\n\n//////////////////\n// constructors //\n//////////////////\n\ntemplate struct external_constructor;\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, typename BasicJsonType::boolean_t b) noexcept\n {\n j.m_type = value_t::boolean;\n j.m_value = b;\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, const typename BasicJsonType::string_t& s)\n {\n j.m_type = value_t::string;\n j.m_value = s;\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, typename BasicJsonType::number_float_t val) noexcept\n {\n // replace infinity and NAN by null\n if (not std::isfinite(val))\n {\n j = BasicJsonType{};\n }\n else\n {\n j.m_type = value_t::number_float;\n j.m_value = val;\n }\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, typename BasicJsonType::number_unsigned_t val) noexcept\n {\n j.m_type = value_t::number_unsigned;\n j.m_value = val;\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, typename BasicJsonType::number_integer_t val) noexcept\n {\n j.m_type = value_t::number_integer;\n j.m_value = val;\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, const typename BasicJsonType::array_t& arr)\n {\n j.m_type = value_t::array;\n j.m_value = arr;\n j.assert_invariant();\n }\n\n template::value,\n int> = 0>\n static void construct(BasicJsonType& j, const CompatibleArrayType& arr)\n {\n using std::begin;\n using std::end;\n j.m_type = value_t::array;\n j.m_value.array = j.template create(begin(arr), end(arr));\n j.assert_invariant();\n }\n};\n\ntemplate<>\nstruct external_constructor\n{\n template\n static void construct(BasicJsonType& j, const typename BasicJsonType::object_t& obj)\n {\n j.m_type = value_t::object;\n j.m_value = obj;\n j.assert_invariant();\n }\n\n template::value,\n int> = 0>\n static void construct(BasicJsonType& j, const CompatibleObjectType& obj)\n {\n using std::begin;\n using std::end;\n\n j.m_type = value_t::object;\n j.m_value.object = j.template create(begin(obj), end(obj));\n j.assert_invariant();\n }\n};\n\n\n////////////////////////\n// has_/is_ functions //\n////////////////////////\n\n/*!\n@brief Helper to determine whether there's a key_type for T.\n\nThis helper is used to tell associative containers apart from other containers\nsuch as sequence containers. For instance, `std::map` passes the test as it\ncontains a `mapped_type`, whereas `std::vector` fails the test.\n\n@sa http://stackoverflow.com/a/7728728/266378\n@since version 1.0.0, overworked in version 2.0.6\n*/\n#define NLOHMANN_JSON_HAS_HELPER(type) \\\n template struct has_##type { \\\n private: \\\n template \\\n static int detect(U &&); \\\n static void detect(...); \\\n public: \\\n static constexpr bool value = \\\n std::is_integral()))>::value; \\\n }\n\nNLOHMANN_JSON_HAS_HELPER(mapped_type);\nNLOHMANN_JSON_HAS_HELPER(key_type);\nNLOHMANN_JSON_HAS_HELPER(value_type);\nNLOHMANN_JSON_HAS_HELPER(iterator);\n\n#undef NLOHMANN_JSON_HAS_HELPER\n\n\ntemplate\nstruct is_compatible_object_type_impl : std::false_type {};\n\ntemplate\nstruct is_compatible_object_type_impl\n{\n static constexpr auto value =\n std::is_constructible::value and\n std::is_constructible::value;\n};\n\ntemplate\nstruct is_compatible_object_type\n{\n static auto constexpr value = is_compatible_object_type_impl <\n conjunction>,\n has_mapped_type,\n has_key_type>::value,\n typename BasicJsonType::object_t, CompatibleObjectType >::value;\n};\n\ntemplate\nstruct is_basic_json_nested_type\n{\n static auto constexpr value = std::is_same::value or\n std::is_same::value or\n std::is_same::value or\n std::is_same::value or\n std::is_same::value;\n};\n\ntemplate\nstruct is_compatible_array_type\n{\n static auto constexpr value =\n conjunction>,\n negation>,\n negation>,\n negation>,\n has_value_type,\n has_iterator>::value;\n};\n\ntemplate\nstruct is_compatible_integer_type_impl : std::false_type {};\n\ntemplate\nstruct is_compatible_integer_type_impl\n{\n // is there an assert somewhere on overflows?\n using RealLimits = std::numeric_limits;\n using CompatibleLimits = std::numeric_limits;\n\n static constexpr auto value =\n std::is_constructible::value and\n CompatibleLimits::is_integer and\n RealLimits::is_signed == CompatibleLimits::is_signed;\n};\n\ntemplate\nstruct is_compatible_integer_type\n{\n static constexpr auto value =\n is_compatible_integer_type_impl <\n std::is_integral::value and\n not std::is_same::value,\n RealIntegerType, CompatibleNumberIntegerType > ::value;\n};\n\n\n// trait checking if JSONSerializer::from_json(json const&, udt&) exists\ntemplate\nstruct has_from_json\n{\n private:\n // also check the return type of from_json\n template::from_json(\n std::declval(), std::declval()))>::value>>\n static int detect(U&&);\n static void detect(...);\n\n public:\n static constexpr bool value = std::is_integral>()))>::value;\n};\n\n// This trait checks if JSONSerializer::from_json(json const&) exists\n// this overload is used for non-default-constructible user-defined-types\ntemplate\nstruct has_non_default_from_json\n{\n private:\n template <\n typename U,\n typename = enable_if_t::from_json(std::declval()))>::value >>\n static int detect(U&&);\n static void detect(...);\n\n public:\n static constexpr bool value = std::is_integral>()))>::value;\n};\n\n// This trait checks if BasicJsonType::json_serializer::to_json exists\ntemplate\nstruct has_to_json\n{\n private:\n template::to_json(\n std::declval(), std::declval()))>\n static int detect(U&&);\n static void detect(...);\n\n public:\n static constexpr bool value = std::is_integral>()))>::value;\n};\n\n\n/////////////\n// to_json //\n/////////////\n\ntemplate::value, int> = 0>\nvoid to_json(BasicJsonType& j, T b) noexcept\n{\n external_constructor::construct(j, b);\n}\n\ntemplate::value, int> = 0>\nvoid to_json(BasicJsonType& j, const CompatibleString& s)\n{\n external_constructor::construct(j, s);\n}\n\ntemplate::value, int> = 0>\nvoid to_json(BasicJsonType& j, FloatType val) noexcept\n{\n external_constructor::construct(j, static_cast(val));\n}\n\ntemplate <\n typename BasicJsonType, typename CompatibleNumberUnsignedType,\n enable_if_t::value, int> = 0 >\nvoid to_json(BasicJsonType& j, CompatibleNumberUnsignedType val) noexcept\n{\n external_constructor::construct(j, static_cast(val));\n}\n\ntemplate <\n typename BasicJsonType, typename CompatibleNumberIntegerType,\n enable_if_t::value, int> = 0 >\nvoid to_json(BasicJsonType& j, CompatibleNumberIntegerType val) noexcept\n{\n external_constructor::construct(j, static_cast(val));\n}\n\ntemplate::value, int> = 0>\nvoid to_json(BasicJsonType& j, UnscopedEnumType e) noexcept\n{\n external_constructor::construct(j, e);\n}\n\ntemplate <\n typename BasicJsonType, typename CompatibleArrayType,\n enable_if_t <\n is_compatible_array_type::value or\n std::is_same::value,\n int > = 0 >\nvoid to_json(BasicJsonType& j, const CompatibleArrayType& arr)\n{\n external_constructor::construct(j, arr);\n}\n\ntemplate <\n typename BasicJsonType, typename CompatibleObjectType,\n enable_if_t::value,\n int> = 0 >\nvoid to_json(BasicJsonType& j, const CompatibleObjectType& arr)\n{\n external_constructor::construct(j, arr);\n}\n\n\n///////////////\n// from_json //\n///////////////\n\n// overloads for basic_json template parameters\ntemplate::value and\n not std::is_same::value,\n int> = 0>\nvoid get_arithmetic_value(const BasicJsonType& j, ArithmeticType& val)\n{\n switch (static_cast(j))\n {\n case value_t::number_unsigned:\n {\n val = static_cast(\n *j.template get_ptr());\n break;\n }\n case value_t::number_integer:\n {\n val = static_cast(\n *j.template get_ptr());\n break;\n }\n case value_t::number_float:\n {\n val = static_cast(\n *j.template get_ptr());\n break;\n }\n default:\n {\n JSON_THROW(\n std::domain_error(\"type must be number, but is \" + j.type_name()));\n }\n }\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::boolean_t& b)\n{\n if (not j.is_boolean())\n {\n JSON_THROW(std::domain_error(\"type must be boolean, but is \" + j.type_name()));\n }\n b = *j.template get_ptr();\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::string_t& s)\n{\n if (not j.is_string())\n {\n JSON_THROW(std::domain_error(\"type must be string, but is \" + j.type_name()));\n }\n s = *j.template get_ptr();\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::number_float_t& val)\n{\n get_arithmetic_value(j, val);\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::number_unsigned_t& val)\n{\n get_arithmetic_value(j, val);\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::number_integer_t& val)\n{\n get_arithmetic_value(j, val);\n}\n\ntemplate::value, int> = 0>\nvoid from_json(const BasicJsonType& j, UnscopedEnumType& e)\n{\n typename std::underlying_type::type val;\n get_arithmetic_value(j, val);\n e = static_cast(val);\n}\n\ntemplate\nvoid from_json(const BasicJsonType& j, typename BasicJsonType::array_t& arr)\n{\n if (not j.is_array())\n {\n JSON_THROW(std::domain_error(\"type must be array, but is \" + j.type_name()));\n }\n arr = *j.template get_ptr();\n}\n\n// forward_list doesn't have an insert method\ntemplate\nvoid from_json(const BasicJsonType& j, std::forward_list& l)\n{\n // do not perform the check when user wants to retrieve jsons\n // (except when it's null.. ?)\n if (j.is_null())\n {\n JSON_THROW(std::domain_error(\"type must be array, but is \" + j.type_name()));\n }\n if (not std::is_same::value)\n {\n if (not j.is_array())\n {\n JSON_THROW(std::domain_error(\"type must be array, but is \" + j.type_name()));\n }\n }\n for (auto it = j.rbegin(), end = j.rend(); it != end; ++it)\n {\n l.push_front(it->template get());\n }\n}\n\ntemplate\nvoid from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<0>)\n{\n using std::begin;\n using std::end;\n\n std::transform(j.begin(), j.end(),\n std::inserter(arr, end(arr)), [](const BasicJsonType & i)\n {\n // get() returns *this, this won't call a from_json\n // method when value_type is BasicJsonType\n return i.template get();\n });\n}\n\ntemplate\nauto from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<1>)\n-> decltype(\n arr.reserve(std::declval()),\n void())\n{\n using std::begin;\n using std::end;\n\n arr.reserve(j.size());\n std::transform(\n j.begin(), j.end(), std::inserter(arr, end(arr)), [](const BasicJsonType & i)\n {\n // get() returns *this, this won't call a from_json\n // method when value_type is BasicJsonType\n return i.template get();\n });\n}\n\ntemplate::value and\n not std::is_same::value, int> = 0>\nvoid from_json(const BasicJsonType& j, CompatibleArrayType& arr)\n{\n if (j.is_null())\n {\n JSON_THROW(std::domain_error(\"type must be array, but is \" + j.type_name()));\n }\n\n // when T == BasicJsonType, do not check if value_t is correct\n if (not std::is_same::value)\n {\n if (not j.is_array())\n {\n JSON_THROW(std::domain_error(\"type must be array, but is \" + j.type_name()));\n }\n }\n from_json_array_impl(j, arr, priority_tag<1> {});\n}\n\ntemplate::value, int> = 0>\nvoid from_json(const BasicJsonType& j, CompatibleObjectType& obj)\n{\n if (not j.is_object())\n {\n JSON_THROW(std::domain_error(\"type must be object, but is \" + j.type_name()));\n }\n\n auto inner_object = j.template get_ptr();\n using std::begin;\n using std::end;\n // we could avoid the assignment, but this might require a for loop, which\n // might be less efficient than the container constructor for some\n // containers (would it?)\n obj = CompatibleObjectType(begin(*inner_object), end(*inner_object));\n}\n\n// overload for arithmetic types, not chosen for basic_json template arguments\n// (BooleanType, etc..); note: Is it really necessary to provide explicit\n// overloads for boolean_t etc. in case of a custom BooleanType which is not\n// an arithmetic type?\ntemplate::value and\n not std::is_same::value and\n not std::is_same::value and\n not std::is_same::value and\n not std::is_same::value,\n int> = 0>\nvoid from_json(const BasicJsonType& j, ArithmeticType& val)\n{\n switch (static_cast(j))\n {\n case value_t::number_unsigned:\n {\n val = static_cast(*j.template get_ptr());\n break;\n }\n case value_t::number_integer:\n {\n val = static_cast(*j.template get_ptr());\n break;\n }\n case value_t::number_float:\n {\n val = static_cast(*j.template get_ptr());\n break;\n }\n case value_t::boolean:\n {\n val = static_cast(*j.template get_ptr());\n break;\n }\n default:\n {\n JSON_THROW(std::domain_error(\"type must be number, but is \" + j.type_name()));\n }\n }\n}\n\nstruct to_json_fn\n{\n private:\n template\n auto call(BasicJsonType& j, T&& val, priority_tag<1>) const noexcept(noexcept(to_json(j, std::forward(val))))\n -> decltype(to_json(j, std::forward(val)), void())\n {\n return to_json(j, std::forward(val));\n }\n\n template\n void call(BasicJsonType&, T&&, priority_tag<0>) const noexcept\n {\n static_assert(sizeof(BasicJsonType) == 0,\n \"could not find to_json() method in T's namespace\");\n }\n\n public:\n template\n void operator()(BasicJsonType& j, T&& val) const\n noexcept(noexcept(std::declval().call(j, std::forward(val), priority_tag<1> {})))\n {\n return call(j, std::forward(val), priority_tag<1> {});\n }\n};\n\nstruct from_json_fn\n{\n private:\n template\n auto call(const BasicJsonType& j, T& val, priority_tag<1>) const\n noexcept(noexcept(from_json(j, val)))\n -> decltype(from_json(j, val), void())\n {\n return from_json(j, val);\n }\n\n template\n void call(const BasicJsonType&, T&, priority_tag<0>) const noexcept\n {\n static_assert(sizeof(BasicJsonType) == 0,\n \"could not find from_json() method in T's namespace\");\n }\n\n public:\n template\n void operator()(const BasicJsonType& j, T& val) const\n noexcept(noexcept(std::declval().call(j, val, priority_tag<1> {})))\n {\n return call(j, val, priority_tag<1> {});\n }\n};\n\n// taken from ranges-v3\ntemplate\nstruct static_const\n{\n static constexpr T value{};\n};\n\ntemplate\nconstexpr T static_const::value;\n} // namespace detail\n\n\n/// namespace to hold default `to_json` / `from_json` functions\nnamespace\n{\nconstexpr const auto& to_json = detail::static_const::value;\nconstexpr const auto& from_json = detail::static_const::value;\n}\n\n\n/*!\n@brief default JSONSerializer template argument\n\nThis serializer ignores the template arguments and uses ADL\n([argument-dependent lookup](http://en.cppreference.com/w/cpp/language/adl))\nfor serialization.\n*/\ntemplate\nstruct adl_serializer\n{\n /*!\n @brief convert a JSON value to any value type\n\n This function is usually called by the `get()` function of the\n @ref basic_json class (either explicit or via conversion operators).\n\n @param[in] j JSON value to read from\n @param[in,out] val value to write to\n */\n template\n static void from_json(BasicJsonType&& j, ValueType& val) noexcept(\n noexcept(::nlohmann::from_json(std::forward(j), val)))\n {\n ::nlohmann::from_json(std::forward(j), val);\n }\n\n /*!\n @brief convert any value type to a JSON value\n\n This function is usually called by the constructors of the @ref basic_json\n class.\n\n @param[in,out] j JSON value to write to\n @param[in] val value to read from\n */\n template\n static void to_json(BasicJsonType& j, ValueType&& val) noexcept(\n noexcept(::nlohmann::to_json(j, std::forward(val))))\n {\n ::nlohmann::to_json(j, std::forward(val));\n }\n};\n\n\n/*!\n@brief a class to store JSON values\n\n@tparam ObjectType type for JSON objects (`std::map` by default; will be used\nin @ref object_t)\n@tparam ArrayType type for JSON arrays (`std::vector` by default; will be used\nin @ref array_t)\n@tparam StringType type for JSON strings and object keys (`std::string` by\ndefault; will be used in @ref string_t)\n@tparam BooleanType type for JSON booleans (`bool` by default; will be used\nin @ref boolean_t)\n@tparam NumberIntegerType type for JSON integer numbers (`int64_t` by\ndefault; will be used in @ref number_integer_t)\n@tparam NumberUnsignedType type for JSON unsigned integer numbers (@c\n`uint64_t` by default; will be used in @ref number_unsigned_t)\n@tparam NumberFloatType type for JSON floating-point numbers (`double` by\ndefault; will be used in @ref number_float_t)\n@tparam AllocatorType type of the allocator to use (`std::allocator` by\ndefault)\n@tparam JSONSerializer the serializer to resolve internal calls to `to_json()`\nand `from_json()` (@ref adl_serializer by default)\n\n@requirement The class satisfies the following concept requirements:\n- Basic\n - [DefaultConstructible](http://en.cppreference.com/w/cpp/concept/DefaultConstructible):\n JSON values can be default constructed. The result will be a JSON null\n value.\n - [MoveConstructible](http://en.cppreference.com/w/cpp/concept/MoveConstructible):\n A JSON value can be constructed from an rvalue argument.\n - [CopyConstructible](http://en.cppreference.com/w/cpp/concept/CopyConstructible):\n A JSON value can be copy-constructed from an lvalue expression.\n - [MoveAssignable](http://en.cppreference.com/w/cpp/concept/MoveAssignable):\n A JSON value van be assigned from an rvalue argument.\n - [CopyAssignable](http://en.cppreference.com/w/cpp/concept/CopyAssignable):\n A JSON value can be copy-assigned from an lvalue expression.\n - [Destructible](http://en.cppreference.com/w/cpp/concept/Destructible):\n JSON values can be destructed.\n- Layout\n - [StandardLayoutType](http://en.cppreference.com/w/cpp/concept/StandardLayoutType):\n JSON values have\n [standard layout](http://en.cppreference.com/w/cpp/language/data_members#Standard_layout):\n All non-static data members are private and standard layout types, the\n class has no virtual functions or (virtual) base classes.\n- Library-wide\n - [EqualityComparable](http://en.cppreference.com/w/cpp/concept/EqualityComparable):\n JSON values can be compared with `==`, see @ref\n operator==(const_reference,const_reference).\n - [LessThanComparable](http://en.cppreference.com/w/cpp/concept/LessThanComparable):\n JSON values can be compared with `<`, see @ref\n operator<(const_reference,const_reference).\n - [Swappable](http://en.cppreference.com/w/cpp/concept/Swappable):\n Any JSON lvalue or rvalue of can be swapped with any lvalue or rvalue of\n other compatible types, using unqualified function call @ref swap().\n - [NullablePointer](http://en.cppreference.com/w/cpp/concept/NullablePointer):\n JSON values can be compared against `std::nullptr_t` objects which are used\n to model the `null` value.\n- Container\n - [Container](http://en.cppreference.com/w/cpp/concept/Container):\n JSON values can be used like STL containers and provide iterator access.\n - [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer);\n JSON values can be used like STL containers and provide reverse iterator\n access.\n\n@invariant The member variables @a m_value and @a m_type have the following\nrelationship:\n- If `m_type == value_t::object`, then `m_value.object != nullptr`.\n- If `m_type == value_t::array`, then `m_value.array != nullptr`.\n- If `m_type == value_t::string`, then `m_value.string != nullptr`.\nThe invariants are checked by member function assert_invariant().\n\n@internal\n@note ObjectType trick from http://stackoverflow.com/a/9860911\n@endinternal\n\n@see [RFC 7159: The JavaScript Object Notation (JSON) Data Interchange\nFormat](http://rfc7159.net/rfc7159)\n\n@since version 1.0.0\n\n@nosubgrouping\n*/\ntemplate <\n template class ObjectType = std::map,\n template class ArrayType = std::vector,\n class StringType = std::string,\n class BooleanType = bool,\n class NumberIntegerType = std::int64_t,\n class NumberUnsignedType = std::uint64_t,\n class NumberFloatType = double,\n template class AllocatorType = std::allocator,\n template class JSONSerializer = adl_serializer\n >\nclass basic_json\n{\n private:\n template friend struct detail::external_constructor;\n /// workaround type for MSVC\n using basic_json_t = basic_json;\n\n public:\n using value_t = detail::value_t;\n // forward declarations\n template class iter_impl;\n template class json_reverse_iterator;\n class json_pointer;\n template\n using json_serializer = JSONSerializer;\n\n /////////////////////\n // container types //\n /////////////////////\n\n /// @name container types\n /// The canonic container types to use @ref basic_json like any other STL\n /// container.\n /// @{\n\n /// the type of elements in a basic_json container\n using value_type = basic_json;\n\n /// the type of an element reference\n using reference = value_type&;\n /// the type of an element const reference\n using const_reference = const value_type&;\n\n /// a type to represent differences between iterators\n using difference_type = std::ptrdiff_t;\n /// a type to represent container sizes\n using size_type = std::size_t;\n\n /// the allocator type\n using allocator_type = AllocatorType;\n\n /// the type of an element pointer\n using pointer = typename std::allocator_traits::pointer;\n /// the type of an element const pointer\n using const_pointer = typename std::allocator_traits::const_pointer;\n\n /// an iterator for a basic_json container\n using iterator = iter_impl;\n /// a const iterator for a basic_json container\n using const_iterator = iter_impl;\n /// a reverse iterator for a basic_json container\n using reverse_iterator = json_reverse_iterator;\n /// a const reverse iterator for a basic_json container\n using const_reverse_iterator = json_reverse_iterator;\n\n /// @}\n\n\n /*!\n @brief returns the allocator associated with the container\n */\n static allocator_type get_allocator()\n {\n return allocator_type();\n }\n\n /*!\n @brief returns version information on the library\n\n This function returns a JSON object with information about the library,\n including the version number and information on the platform and compiler.\n\n @return JSON object holding version information\n key | description\n ----------- | ---------------\n `compiler` | Information on the used compiler. It is an object with the following keys: `c++` (the used C++ standard), `family` (the compiler family; possible values are `clang`, `icc`, `gcc`, `ilecpp`, `msvc`, `pgcpp`, `sunpro`, and `unknown`), and `version` (the compiler version).\n `copyright` | The copyright line for the library as string.\n `name` | The name of the library as string.\n `platform` | The used platform as string. Possible values are `win32`, `linux`, `apple`, `unix`, and `unknown`.\n `url` | The URL of the project as string.\n `version` | The version of the library. It is an object with the following keys: `major`, `minor`, and `patch` as defined by [Semantic Versioning](http://semver.org), and `string` (the version string).\n\n @liveexample{The following code shows an example output of the `meta()`\n function.,meta}\n\n @complexity Constant.\n\n @since 2.1.0\n */\n static basic_json meta()\n {\n basic_json result;\n\n result[\"copyright\"] = \"(C) 2013-2017 Niels Lohmann\";\n result[\"name\"] = \"JSON for Modern C++\";\n result[\"url\"] = \"https://github.com/nlohmann/json\";\n result[\"version\"] =\n {\n {\"string\", \"2.1.1\"}, {\"major\", 2}, {\"minor\", 1}, {\"patch\", 1}\n };\n\n#ifdef _WIN32\n result[\"platform\"] = \"win32\";\n#elif defined __linux__\n result[\"platform\"] = \"linux\";\n#elif defined __APPLE__\n result[\"platform\"] = \"apple\";\n#elif defined __unix__\n result[\"platform\"] = \"unix\";\n#else\n result[\"platform\"] = \"unknown\";\n#endif\n\n#if defined(__clang__)\n result[\"compiler\"] = {{\"family\", \"clang\"}, {\"version\", __clang_version__}};\n#elif defined(__ICC) || defined(__INTEL_COMPILER)\n result[\"compiler\"] = {{\"family\", \"icc\"}, {\"version\", __INTEL_COMPILER}};\n#elif defined(__GNUC__) || defined(__GNUG__)\n result[\"compiler\"] = {{\"family\", \"gcc\"}, {\"version\", std::to_string(__GNUC__) + \".\" + std::to_string(__GNUC_MINOR__) + \".\" + std::to_string(__GNUC_PATCHLEVEL__)}};\n#elif defined(__HP_cc) || defined(__HP_aCC)\n result[\"compiler\"] = \"hp\"\n#elif defined(__IBMCPP__)\n result[\"compiler\"] = {{\"family\", \"ilecpp\"}, {\"version\", __IBMCPP__}};\n#elif defined(_MSC_VER)\n result[\"compiler\"] = {{\"family\", \"msvc\"}, {\"version\", _MSC_VER}};\n#elif defined(__PGI)\n result[\"compiler\"] = {{\"family\", \"pgcpp\"}, {\"version\", __PGI}};\n#elif defined(__SUNPRO_CC)\n result[\"compiler\"] = {{\"family\", \"sunpro\"}, {\"version\", __SUNPRO_CC}};\n#else\n result[\"compiler\"] = {{\"family\", \"unknown\"}, {\"version\", \"unknown\"}};\n#endif\n\n#ifdef __cplusplus\n result[\"compiler\"][\"c++\"] = std::to_string(__cplusplus);\n#else\n result[\"compiler\"][\"c++\"] = \"unknown\";\n#endif\n return result;\n }\n\n\n ///////////////////////////\n // JSON value data types //\n ///////////////////////////\n\n /// @name JSON value data types\n /// The data types to store a JSON value. These types are derived from\n /// the template arguments passed to class @ref basic_json.\n /// @{\n\n /*!\n @brief a type for an object\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes JSON objects as follows:\n > An object is an unordered collection of zero or more name/value pairs,\n > where a name is a string and a value is a string, number, boolean, null,\n > object, or array.\n\n To store objects in C++, a type is defined by the template parameters\n described below.\n\n @tparam ObjectType the container to store objects (e.g., `std::map` or\n `std::unordered_map`)\n @tparam StringType the type of the keys or names (e.g., `std::string`).\n The comparison function `std::less` is used to order elements\n inside the container.\n @tparam AllocatorType the allocator to use for objects (e.g.,\n `std::allocator`)\n\n #### Default type\n\n With the default values for @a ObjectType (`std::map`), @a StringType\n (`std::string`), and @a AllocatorType (`std::allocator`), the default\n value for @a object_t is:\n\n @code {.cpp}\n std::map<\n std::string, // key_type\n basic_json, // value_type\n std::less, // key_compare\n std::allocator> // allocator_type\n >\n @endcode\n\n #### Behavior\n\n The choice of @a object_t influences the behavior of the JSON class. With\n the default type, objects have the following behavior:\n\n - When all names are unique, objects will be interoperable in the sense\n that all software implementations receiving that object will agree on\n the name-value mappings.\n - When the names within an object are not unique, later stored name/value\n pairs overwrite previously stored name/value pairs, leaving the used\n names unique. For instance, `{\"key\": 1}` and `{\"key\": 2, \"key\": 1}` will\n be treated as equal and both stored as `{\"key\": 1}`.\n - Internally, name/value pairs are stored in lexicographical order of the\n names. Objects will also be serialized (see @ref dump) in this order.\n For instance, `{\"b\": 1, \"a\": 2}` and `{\"a\": 2, \"b\": 1}` will be stored\n and serialized as `{\"a\": 2, \"b\": 1}`.\n - When comparing objects, the order of the name/value pairs is irrelevant.\n This makes objects interoperable in the sense that they will not be\n affected by these differences. For instance, `{\"b\": 1, \"a\": 2}` and\n `{\"a\": 2, \"b\": 1}` will be treated as equal.\n\n #### Limits\n\n [RFC 7159](http://rfc7159.net/rfc7159) specifies:\n > An implementation may set limits on the maximum depth of nesting.\n\n In this class, the object's limit of nesting is not constraint explicitly.\n However, a maximum depth of nesting may be introduced by the compiler or\n runtime environment. A theoretical limit can be queried by calling the\n @ref max_size function of a JSON object.\n\n #### Storage\n\n Objects are stored as pointers in a @ref basic_json type. That is, for any\n access to object values, a pointer of type `object_t*` must be\n dereferenced.\n\n @sa @ref array_t -- type for an array value\n\n @since version 1.0.0\n\n @note The order name/value pairs are added to the object is *not*\n preserved by the library. Therefore, iterating an object may return\n name/value pairs in a different order than they were originally stored. In\n fact, keys will be traversed in alphabetical order as `std::map` with\n `std::less` is used by default. Please note this behavior conforms to [RFC\n 7159](http://rfc7159.net/rfc7159), because any order implements the\n specified \"unordered\" nature of JSON objects.\n */\n using object_t = ObjectType,\n AllocatorType>>;\n\n /*!\n @brief a type for an array\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes JSON arrays as follows:\n > An array is an ordered sequence of zero or more values.\n\n To store objects in C++, a type is defined by the template parameters\n explained below.\n\n @tparam ArrayType container type to store arrays (e.g., `std::vector` or\n `std::list`)\n @tparam AllocatorType allocator to use for arrays (e.g., `std::allocator`)\n\n #### Default type\n\n With the default values for @a ArrayType (`std::vector`) and @a\n AllocatorType (`std::allocator`), the default value for @a array_t is:\n\n @code {.cpp}\n std::vector<\n basic_json, // value_type\n std::allocator // allocator_type\n >\n @endcode\n\n #### Limits\n\n [RFC 7159](http://rfc7159.net/rfc7159) specifies:\n > An implementation may set limits on the maximum depth of nesting.\n\n In this class, the array's limit of nesting is not constraint explicitly.\n However, a maximum depth of nesting may be introduced by the compiler or\n runtime environment. A theoretical limit can be queried by calling the\n @ref max_size function of a JSON array.\n\n #### Storage\n\n Arrays are stored as pointers in a @ref basic_json type. That is, for any\n access to array values, a pointer of type `array_t*` must be dereferenced.\n\n @sa @ref object_t -- type for an object value\n\n @since version 1.0.0\n */\n using array_t = ArrayType>;\n\n /*!\n @brief a type for a string\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes JSON strings as follows:\n > A string is a sequence of zero or more Unicode characters.\n\n To store objects in C++, a type is defined by the template parameter\n described below. Unicode values are split by the JSON class into\n byte-sized characters during deserialization.\n\n @tparam StringType the container to store strings (e.g., `std::string`).\n Note this container is used for keys/names in objects, see @ref object_t.\n\n #### Default type\n\n With the default values for @a StringType (`std::string`), the default\n value for @a string_t is:\n\n @code {.cpp}\n std::string\n @endcode\n\n #### Encoding\n\n Strings are stored in UTF-8 encoding. Therefore, functions like\n `std::string::size()` or `std::string::length()` return the number of\n bytes in the string rather than the number of characters or glyphs.\n\n #### String comparison\n\n [RFC 7159](http://rfc7159.net/rfc7159) states:\n > Software implementations are typically required to test names of object\n > members for equality. Implementations that transform the textual\n > representation into sequences of Unicode code units and then perform the\n > comparison numerically, code unit by code unit, are interoperable in the\n > sense that implementations will agree in all cases on equality or\n > inequality of two strings. For example, implementations that compare\n > strings with escaped characters unconverted may incorrectly find that\n > `\"a\\\\b\"` and `\"a\\u005Cb\"` are not equal.\n\n This implementation is interoperable as it does compare strings code unit\n by code unit.\n\n #### Storage\n\n String values are stored as pointers in a @ref basic_json type. That is,\n for any access to string values, a pointer of type `string_t*` must be\n dereferenced.\n\n @since version 1.0.0\n */\n using string_t = StringType;\n\n /*!\n @brief a type for a boolean\n\n [RFC 7159](http://rfc7159.net/rfc7159) implicitly describes a boolean as a\n type which differentiates the two literals `true` and `false`.\n\n To store objects in C++, a type is defined by the template parameter @a\n BooleanType which chooses the type to use.\n\n #### Default type\n\n With the default values for @a BooleanType (`bool`), the default value for\n @a boolean_t is:\n\n @code {.cpp}\n bool\n @endcode\n\n #### Storage\n\n Boolean values are stored directly inside a @ref basic_json type.\n\n @since version 1.0.0\n */\n using boolean_t = BooleanType;\n\n /*!\n @brief a type for a number (integer)\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:\n > The representation of numbers is similar to that used in most\n > programming languages. A number is represented in base 10 using decimal\n > digits. It contains an integer component that may be prefixed with an\n > optional minus sign, which may be followed by a fraction part and/or an\n > exponent part. Leading zeros are not allowed. (...) Numeric values that\n > cannot be represented in the grammar below (such as Infinity and NaN)\n > are not permitted.\n\n This description includes both integer and floating-point numbers.\n However, C++ allows more precise storage if it is known whether the number\n is a signed integer, an unsigned integer or a floating-point number.\n Therefore, three different types, @ref number_integer_t, @ref\n number_unsigned_t and @ref number_float_t are used.\n\n To store integer numbers in C++, a type is defined by the template\n parameter @a NumberIntegerType which chooses the type to use.\n\n #### Default type\n\n With the default values for @a NumberIntegerType (`int64_t`), the default\n value for @a number_integer_t is:\n\n @code {.cpp}\n int64_t\n @endcode\n\n #### Default behavior\n\n - The restrictions about leading zeros is not enforced in C++. Instead,\n leading zeros in integer literals lead to an interpretation as octal\n number. Internally, the value will be stored as decimal number. For\n instance, the C++ integer literal `010` will be serialized to `8`.\n During deserialization, leading zeros yield an error.\n - Not-a-number (NaN) values will be serialized to `null`.\n\n #### Limits\n\n [RFC 7159](http://rfc7159.net/rfc7159) specifies:\n > An implementation may set limits on the range and precision of numbers.\n\n When the default type is used, the maximal integer number that can be\n stored is `9223372036854775807` (INT64_MAX) and the minimal integer number\n that can be stored is `-9223372036854775808` (INT64_MIN). Integer numbers\n that are out of range will yield over/underflow when used in a\n constructor. During deserialization, too large or small integer numbers\n will be automatically be stored as @ref number_unsigned_t or @ref\n number_float_t.\n\n [RFC 7159](http://rfc7159.net/rfc7159) further states:\n > Note that when such software is used, numbers that are integers and are\n > in the range \\f$[-2^{53}+1, 2^{53}-1]\\f$ are interoperable in the sense\n > that implementations will agree exactly on their numeric values.\n\n As this range is a subrange of the exactly supported range [INT64_MIN,\n INT64_MAX], this class's integer type is interoperable.\n\n #### Storage\n\n Integer number values are stored directly inside a @ref basic_json type.\n\n @sa @ref number_float_t -- type for number values (floating-point)\n\n @sa @ref number_unsigned_t -- type for number values (unsigned integer)\n\n @since version 1.0.0\n */\n using number_integer_t = NumberIntegerType;\n\n /*!\n @brief a type for a number (unsigned)\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:\n > The representation of numbers is similar to that used in most\n > programming languages. A number is represented in base 10 using decimal\n > digits. It contains an integer component that may be prefixed with an\n > optional minus sign, which may be followed by a fraction part and/or an\n > exponent part. Leading zeros are not allowed. (...) Numeric values that\n > cannot be represented in the grammar below (such as Infinity and NaN)\n > are not permitted.\n\n This description includes both integer and floating-point numbers.\n However, C++ allows more precise storage if it is known whether the number\n is a signed integer, an unsigned integer or a floating-point number.\n Therefore, three different types, @ref number_integer_t, @ref\n number_unsigned_t and @ref number_float_t are used.\n\n To store unsigned integer numbers in C++, a type is defined by the\n template parameter @a NumberUnsignedType which chooses the type to use.\n\n #### Default type\n\n With the default values for @a NumberUnsignedType (`uint64_t`), the\n default value for @a number_unsigned_t is:\n\n @code {.cpp}\n uint64_t\n @endcode\n\n #### Default behavior\n\n - The restrictions about leading zeros is not enforced in C++. Instead,\n leading zeros in integer literals lead to an interpretation as octal\n number. Internally, the value will be stored as decimal number. For\n instance, the C++ integer literal `010` will be serialized to `8`.\n During deserialization, leading zeros yield an error.\n - Not-a-number (NaN) values will be serialized to `null`.\n\n #### Limits\n\n [RFC 7159](http://rfc7159.net/rfc7159) specifies:\n > An implementation may set limits on the range and precision of numbers.\n\n When the default type is used, the maximal integer number that can be\n stored is `18446744073709551615` (UINT64_MAX) and the minimal integer\n number that can be stored is `0`. Integer numbers that are out of range\n will yield over/underflow when used in a constructor. During\n deserialization, too large or small integer numbers will be automatically\n be stored as @ref number_integer_t or @ref number_float_t.\n\n [RFC 7159](http://rfc7159.net/rfc7159) further states:\n > Note that when such software is used, numbers that are integers and are\n > in the range \\f$[-2^{53}+1, 2^{53}-1]\\f$ are interoperable in the sense\n > that implementations will agree exactly on their numeric values.\n\n As this range is a subrange (when considered in conjunction with the\n number_integer_t type) of the exactly supported range [0, UINT64_MAX],\n this class's integer type is interoperable.\n\n #### Storage\n\n Integer number values are stored directly inside a @ref basic_json type.\n\n @sa @ref number_float_t -- type for number values (floating-point)\n @sa @ref number_integer_t -- type for number values (integer)\n\n @since version 2.0.0\n */\n using number_unsigned_t = NumberUnsignedType;\n\n /*!\n @brief a type for a number (floating-point)\n\n [RFC 7159](http://rfc7159.net/rfc7159) describes numbers as follows:\n > The representation of numbers is similar to that used in most\n > programming languages. A number is represented in base 10 using decimal\n > digits. It contains an integer component that may be prefixed with an\n > optional minus sign, which may be followed by a fraction part and/or an\n > exponent part. Leading zeros are not allowed. (...) Numeric values that\n > cannot be represented in the grammar below (such as Infinity and NaN)\n > are not permitted.\n\n This description includes both integer and floating-point numbers.\n However, C++ allows more precise storage if it is known whether the number\n is a signed integer, an unsigned integer or a floating-point number.\n Therefore, three different types, @ref number_integer_t, @ref\n number_unsigned_t and @ref number_float_t are used.\n\n To store floating-point numbers in C++, a type is defined by the template\n parameter @a NumberFloatType which chooses the type to use.\n\n #### Default type\n\n With the default values for @a NumberFloatType (`double`), the default\n value for @a number_float_t is:\n\n @code {.cpp}\n double\n @endcode\n\n #### Default behavior\n\n - The restrictions about leading zeros is not enforced in C++. Instead,\n leading zeros in floating-point literals will be ignored. Internally,\n the value will be stored as decimal number. For instance, the C++\n floating-point literal `01.2` will be serialized to `1.2`. During\n deserialization, leading zeros yield an error.\n - Not-a-number (NaN) values will be serialized to `null`.\n\n #### Limits\n\n [RFC 7159](http://rfc7159.net/rfc7159) states:\n > This specification allows implementations to set limits on the range and\n > precision of numbers accepted. Since software that implements IEEE\n > 754-2008 binary64 (double precision) numbers is generally available and\n > widely used, good interoperability can be achieved by implementations\n > that expect no more precision or range than these provide, in the sense\n > that implementations will approximate JSON numbers within the expected\n > precision.\n\n This implementation does exactly follow this approach, as it uses double\n precision floating-point numbers. Note values smaller than\n `-1.79769313486232e+308` and values greater than `1.79769313486232e+308`\n will be stored as NaN internally and be serialized to `null`.\n\n #### Storage\n\n Floating-point number values are stored directly inside a @ref basic_json\n type.\n\n @sa @ref number_integer_t -- type for number values (integer)\n\n @sa @ref number_unsigned_t -- type for number values (unsigned integer)\n\n @since version 1.0.0\n */\n using number_float_t = NumberFloatType;\n\n /// @}\n\n private:\n\n /// helper for exception-safe object creation\n template\n static T* create(Args&& ... args)\n {\n AllocatorType alloc;\n auto deleter = [&](T * object)\n {\n alloc.deallocate(object, 1);\n };\n std::unique_ptr object(alloc.allocate(1), deleter);\n alloc.construct(object.get(), std::forward(args)...);\n assert(object != nullptr);\n return object.release();\n }\n\n ////////////////////////\n // JSON value storage //\n ////////////////////////\n\n /*!\n @brief a JSON value\n\n The actual storage for a JSON value of the @ref basic_json class. This\n union combines the different storage types for the JSON value types\n defined in @ref value_t.\n\n JSON type | value_t type | used type\n --------- | --------------- | ------------------------\n object | object | pointer to @ref object_t\n array | array | pointer to @ref array_t\n string | string | pointer to @ref string_t\n boolean | boolean | @ref boolean_t\n number | number_integer | @ref number_integer_t\n number | number_unsigned | @ref number_unsigned_t\n number | number_float | @ref number_float_t\n null | null | *no value is stored*\n\n @note Variable-length types (objects, arrays, and strings) are stored as\n pointers. The size of the union should not exceed 64 bits if the default\n value types are used.\n\n @since version 1.0.0\n */\n union json_value\n {\n /// object (stored with pointer to save storage)\n object_t* object;\n /// array (stored with pointer to save storage)\n array_t* array;\n /// string (stored with pointer to save storage)\n string_t* string;\n /// boolean\n boolean_t boolean;\n /// number (integer)\n number_integer_t number_integer;\n /// number (unsigned integer)\n number_unsigned_t number_unsigned;\n /// number (floating-point)\n number_float_t number_float;\n\n /// default constructor (for null values)\n json_value() = default;\n /// constructor for booleans\n json_value(boolean_t v) noexcept : boolean(v) {}\n /// constructor for numbers (integer)\n json_value(number_integer_t v) noexcept : number_integer(v) {}\n /// constructor for numbers (unsigned)\n json_value(number_unsigned_t v) noexcept : number_unsigned(v) {}\n /// constructor for numbers (floating-point)\n json_value(number_float_t v) noexcept : number_float(v) {}\n /// constructor for empty values of a given type\n json_value(value_t t)\n {\n switch (t)\n {\n case value_t::object:\n {\n object = create();\n break;\n }\n\n case value_t::array:\n {\n array = create();\n break;\n }\n\n case value_t::string:\n {\n string = create(\"\");\n break;\n }\n\n case value_t::boolean:\n {\n boolean = boolean_t(false);\n break;\n }\n\n case value_t::number_integer:\n {\n number_integer = number_integer_t(0);\n break;\n }\n\n case value_t::number_unsigned:\n {\n number_unsigned = number_unsigned_t(0);\n break;\n }\n\n case value_t::number_float:\n {\n number_float = number_float_t(0.0);\n break;\n }\n\n case value_t::null:\n {\n break;\n }\n\n default:\n {\n if (t == value_t::null)\n {\n JSON_THROW(std::domain_error(\"961c151d2e87f2686a955a9be24d316f1362bf21 2.1.1\")); // LCOV_EXCL_LINE\n }\n break;\n }\n }\n }\n\n /// constructor for strings\n json_value(const string_t& value)\n {\n string = create(value);\n }\n\n /// constructor for objects\n json_value(const object_t& value)\n {\n object = create(value);\n }\n\n /// constructor for arrays\n json_value(const array_t& value)\n {\n array = create(value);\n }\n };\n\n /*!\n @brief checks the class invariants\n\n This function asserts the class invariants. It needs to be called at the\n end of every constructor to make sure that created objects respect the\n invariant. Furthermore, it has to be called each time the type of a JSON\n value is changed, because the invariant expresses a relationship between\n @a m_type and @a m_value.\n */\n void assert_invariant() const\n {\n assert(m_type != value_t::object or m_value.object != nullptr);\n assert(m_type != value_t::array or m_value.array != nullptr);\n assert(m_type != value_t::string or m_value.string != nullptr);\n }\n\n public:\n //////////////////////////\n // JSON parser callback //\n //////////////////////////\n\n /*!\n @brief JSON callback events\n\n This enumeration lists the parser events that can trigger calling a\n callback function of type @ref parser_callback_t during parsing.\n\n @image html callback_events.png \"Example when certain parse events are triggered\"\n\n @since version 1.0.0\n */\n enum class parse_event_t : uint8_t\n {\n /// the parser read `{` and started to process a JSON object\n object_start,\n /// the parser read `}` and finished processing a JSON object\n object_end,\n /// the parser read `[` and started to process a JSON array\n array_start,\n /// the parser read `]` and finished processing a JSON array\n array_end,\n /// the parser read a key of a value in an object\n key,\n /// the parser finished reading a JSON value\n value\n };\n\n /*!\n @brief per-element parser callback type\n\n With a parser callback function, the result of parsing a JSON text can be\n influenced. When passed to @ref parse(std::istream&, const\n parser_callback_t) or @ref parse(const CharT, const parser_callback_t),\n it is called on certain events (passed as @ref parse_event_t via parameter\n @a event) with a set recursion depth @a depth and context JSON value\n @a parsed. The return value of the callback function is a boolean\n indicating whether the element that emitted the callback shall be kept or\n not.\n\n We distinguish six scenarios (determined by the event type) in which the\n callback function can be called. The following table describes the values\n of the parameters @a depth, @a event, and @a parsed.\n\n parameter @a event | description | parameter @a depth | parameter @a parsed\n ------------------ | ----------- | ------------------ | -------------------\n parse_event_t::object_start | the parser read `{` and started to process a JSON object | depth of the parent of the JSON object | a JSON value with type discarded\n parse_event_t::key | the parser read a key of a value in an object | depth of the currently parsed JSON object | a JSON string containing the key\n parse_event_t::object_end | the parser read `}` and finished processing a JSON object | depth of the parent of the JSON object | the parsed JSON object\n parse_event_t::array_start | the parser read `[` and started to process a JSON array | depth of the parent of the JSON array | a JSON value with type discarded\n parse_event_t::array_end | the parser read `]` and finished processing a JSON array | depth of the parent of the JSON array | the parsed JSON array\n parse_event_t::value | the parser finished reading a JSON value | depth of the value | the parsed JSON value\n\n @image html callback_events.png \"Example when certain parse events are triggered\"\n\n Discarding a value (i.e., returning `false`) has different effects\n depending on the context in which function was called:\n\n - Discarded values in structured types are skipped. That is, the parser\n will behave as if the discarded value was never read.\n - In case a value outside a structured type is skipped, it is replaced\n with `null`. This case happens if the top-level element is skipped.\n\n @param[in] depth the depth of the recursion during parsing\n\n @param[in] event an event of type parse_event_t indicating the context in\n the callback function has been called\n\n @param[in,out] parsed the current intermediate parse result; note that\n writing to this value has no effect for parse_event_t::key events\n\n @return Whether the JSON value which called the function during parsing\n should be kept (`true`) or not (`false`). In the latter case, it is either\n skipped completely or replaced by an empty discarded object.\n\n @sa @ref parse(std::istream&, parser_callback_t) or\n @ref parse(const CharT, const parser_callback_t) for examples\n\n @since version 1.0.0\n */\n using parser_callback_t = std::function;\n\n\n //////////////////\n // constructors //\n //////////////////\n\n /// @name constructors and destructors\n /// Constructors of class @ref basic_json, copy/move constructor, copy\n /// assignment, static functions creating objects, and the destructor.\n /// @{\n\n /*!\n @brief create an empty value with a given type\n\n Create an empty JSON value with a given type. The value will be default\n initialized with an empty value which depends on the type:\n\n Value type | initial value\n ----------- | -------------\n null | `null`\n boolean | `false`\n string | `\"\"`\n number | `0`\n object | `{}`\n array | `[]`\n\n @param[in] value_type the type of the value to create\n\n @complexity Constant.\n\n @throw std::bad_alloc if allocation for object, array, or string value\n fails\n\n @liveexample{The following code shows the constructor for different @ref\n value_t values,basic_json__value_t}\n\n @since version 1.0.0\n */\n basic_json(const value_t value_type)\n : m_type(value_type), m_value(value_type)\n {\n assert_invariant();\n }\n\n /*!\n @brief create a null object\n\n Create a `null` JSON value. It either takes a null pointer as parameter\n (explicitly creating `null`) or no parameter (implicitly creating `null`).\n The passed null pointer itself is not read -- it is only used to choose\n the right constructor.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this constructor never throws\n exceptions.\n\n @liveexample{The following code shows the constructor with and without a\n null pointer parameter.,basic_json__nullptr_t}\n\n @since version 1.0.0\n */\n basic_json(std::nullptr_t = nullptr) noexcept\n : basic_json(value_t::null)\n {\n assert_invariant();\n }\n\n /*!\n @brief create a JSON value\n\n This is a \"catch all\" constructor for all compatible JSON types; that is,\n types for which a `to_json()` method exsits. The constructor forwards the\n parameter @a val to that method (to `json_serializer::to_json` method\n with `U = uncvref_t`, to be exact).\n\n Template type @a CompatibleType includes, but is not limited to, the\n following types:\n - **arrays**: @ref array_t and all kinds of compatible containers such as\n `std::vector`, `std::deque`, `std::list`, `std::forward_list`,\n `std::array`, `std::set`, `std::unordered_set`, `std::multiset`, and\n `unordered_multiset` with a `value_type` from which a @ref basic_json\n value can be constructed.\n - **objects**: @ref object_t and all kinds of compatible associative\n containers such as `std::map`, `std::unordered_map`, `std::multimap`,\n and `std::unordered_multimap` with a `key_type` compatible to\n @ref string_t and a `value_type` from which a @ref basic_json value can\n be constructed.\n - **strings**: @ref string_t, string literals, and all compatible string\n containers can be used.\n - **numbers**: @ref number_integer_t, @ref number_unsigned_t,\n @ref number_float_t, and all convertible number types such as `int`,\n `size_t`, `int64_t`, `float` or `double` can be used.\n - **boolean**: @ref boolean_t / `bool` can be used.\n\n See the examples below.\n\n @tparam CompatibleType a type such that:\n - @a CompatibleType is not derived from `std::istream`,\n - @a CompatibleType is not @ref basic_json (to avoid hijacking copy/move\n constructors),\n - @a CompatibleType is not a @ref basic_json nested type (e.g.,\n @ref json_pointer, @ref iterator, etc ...)\n - @ref @ref json_serializer has a\n `to_json(basic_json_t&, CompatibleType&&)` method\n\n @tparam U = `uncvref_t`\n\n @param[in] val the value to be forwarded\n\n @complexity Usually linear in the size of the passed @a val, also\n depending on the implementation of the called `to_json()`\n method.\n\n @throw what `json_serializer::to_json()` throws\n\n @liveexample{The following code shows the constructor with several\n compatible types.,basic_json__CompatibleType}\n\n @since version 2.1.0\n */\n template,\n detail::enable_if_t::value and\n not std::is_same::value and\n not detail::is_basic_json_nested_type<\n basic_json_t, U>::value and\n detail::has_to_json::value,\n int> = 0>\n basic_json(CompatibleType && val) noexcept(noexcept(JSONSerializer::to_json(\n std::declval(), std::forward(val))))\n {\n JSONSerializer::to_json(*this, std::forward(val));\n assert_invariant();\n }\n\n /*!\n @brief create a container (array or object) from an initializer list\n\n Creates a JSON value of type array or object from the passed initializer\n list @a init. In case @a type_deduction is `true` (default), the type of\n the JSON value to be created is deducted from the initializer list @a init\n according to the following rules:\n\n 1. If the list is empty, an empty JSON object value `{}` is created.\n 2. If the list consists of pairs whose first element is a string, a JSON\n object value is created where the first elements of the pairs are\n treated as keys and the second elements are as values.\n 3. In all other cases, an array is created.\n\n The rules aim to create the best fit between a C++ initializer list and\n JSON values. The rationale is as follows:\n\n 1. The empty initializer list is written as `{}` which is exactly an empty\n JSON object.\n 2. C++ has now way of describing mapped types other than to list a list of\n pairs. As JSON requires that keys must be of type string, rule 2 is the\n weakest constraint one can pose on initializer lists to interpret them\n as an object.\n 3. In all other cases, the initializer list could not be interpreted as\n JSON object type, so interpreting it as JSON array type is safe.\n\n With the rules described above, the following JSON values cannot be\n expressed by an initializer list:\n\n - the empty array (`[]`): use @ref array(std::initializer_list)\n with an empty initializer list in this case\n - arrays whose elements satisfy rule 2: use @ref\n array(std::initializer_list) with the same initializer list\n in this case\n\n @note When used without parentheses around an empty initializer list, @ref\n basic_json() is called instead of this function, yielding the JSON null\n value.\n\n @param[in] init initializer list with JSON values\n\n @param[in] type_deduction internal parameter; when set to `true`, the type\n of the JSON value is deducted from the initializer list @a init; when set\n to `false`, the type provided via @a manual_type is forced. This mode is\n used by the functions @ref array(std::initializer_list) and\n @ref object(std::initializer_list).\n\n @param[in] manual_type internal parameter; when @a type_deduction is set\n to `false`, the created JSON value will use the provided type (only @ref\n value_t::array and @ref value_t::object are valid); when @a type_deduction\n is set to `true`, this parameter has no effect\n\n @throw std::domain_error if @a type_deduction is `false`, @a manual_type\n is `value_t::object`, but @a init contains an element which is not a pair\n whose first element is a string; example: `\"cannot create object from\n initializer list\"`\n\n @complexity Linear in the size of the initializer list @a init.\n\n @liveexample{The example below shows how JSON values are created from\n initializer lists.,basic_json__list_init_t}\n\n @sa @ref array(std::initializer_list) -- create a JSON array\n value from an initializer list\n @sa @ref object(std::initializer_list) -- create a JSON object\n value from an initializer list\n\n @since version 1.0.0\n */\n basic_json(std::initializer_list init,\n bool type_deduction = true,\n value_t manual_type = value_t::array)\n {\n // check if each element is an array with two elements whose first\n // element is a string\n bool is_an_object = std::all_of(init.begin(), init.end(),\n [](const basic_json & element)\n {\n return element.is_array() and element.size() == 2 and element[0].is_string();\n });\n\n // adjust type if type deduction is not wanted\n if (not type_deduction)\n {\n // if array is wanted, do not create an object though possible\n if (manual_type == value_t::array)\n {\n is_an_object = false;\n }\n\n // if object is wanted but impossible, throw an exception\n if (manual_type == value_t::object and not is_an_object)\n {\n JSON_THROW(std::domain_error(\"cannot create object from initializer list\"));\n }\n }\n\n if (is_an_object)\n {\n // the initializer list is a list of pairs -> create object\n m_type = value_t::object;\n m_value = value_t::object;\n\n std::for_each(init.begin(), init.end(), [this](const basic_json & element)\n {\n m_value.object->emplace(*(element[0].m_value.string), element[1]);\n });\n }\n else\n {\n // the initializer list describes an array -> create array\n m_type = value_t::array;\n m_value.array = create(init);\n }\n\n assert_invariant();\n }\n\n /*!\n @brief explicitly create an array from an initializer list\n\n Creates a JSON array value from a given initializer list. That is, given a\n list of values `a, b, c`, creates the JSON value `[a, b, c]`. If the\n initializer list is empty, the empty array `[]` is created.\n\n @note This function is only needed to express two edge cases that cannot\n be realized with the initializer list constructor (@ref\n basic_json(std::initializer_list, bool, value_t)). These cases\n are:\n 1. creating an array whose elements are all pairs whose first element is a\n string -- in this case, the initializer list constructor would create an\n object, taking the first elements as keys\n 2. creating an empty array -- passing the empty initializer list to the\n initializer list constructor yields an empty object\n\n @param[in] init initializer list with JSON values to create an array from\n (optional)\n\n @return JSON array value\n\n @complexity Linear in the size of @a init.\n\n @liveexample{The following code shows an example for the `array`\n function.,array}\n\n @sa @ref basic_json(std::initializer_list, bool, value_t) --\n create a JSON value from an initializer list\n @sa @ref object(std::initializer_list) -- create a JSON object\n value from an initializer list\n\n @since version 1.0.0\n */\n static basic_json array(std::initializer_list init =\n std::initializer_list())\n {\n return basic_json(init, false, value_t::array);\n }\n\n /*!\n @brief explicitly create an object from an initializer list\n\n Creates a JSON object value from a given initializer list. The initializer\n lists elements must be pairs, and their first elements must be strings. If\n the initializer list is empty, the empty object `{}` is created.\n\n @note This function is only added for symmetry reasons. In contrast to the\n related function @ref array(std::initializer_list), there are\n no cases which can only be expressed by this function. That is, any\n initializer list @a init can also be passed to the initializer list\n constructor @ref basic_json(std::initializer_list, bool,\n value_t).\n\n @param[in] init initializer list to create an object from (optional)\n\n @return JSON object value\n\n @throw std::domain_error if @a init is not a pair whose first elements are\n strings; thrown by\n @ref basic_json(std::initializer_list, bool, value_t)\n\n @complexity Linear in the size of @a init.\n\n @liveexample{The following code shows an example for the `object`\n function.,object}\n\n @sa @ref basic_json(std::initializer_list, bool, value_t) --\n create a JSON value from an initializer list\n @sa @ref array(std::initializer_list) -- create a JSON array\n value from an initializer list\n\n @since version 1.0.0\n */\n static basic_json object(std::initializer_list init =\n std::initializer_list())\n {\n return basic_json(init, false, value_t::object);\n }\n\n /*!\n @brief construct an array with count copies of given value\n\n Constructs a JSON array value by creating @a cnt copies of a passed value.\n In case @a cnt is `0`, an empty array is created. As postcondition,\n `std::distance(begin(),end()) == cnt` holds.\n\n @param[in] cnt the number of JSON copies of @a val to create\n @param[in] val the JSON value to copy\n\n @complexity Linear in @a cnt.\n\n @liveexample{The following code shows examples for the @ref\n basic_json(size_type\\, const basic_json&)\n constructor.,basic_json__size_type_basic_json}\n\n @since version 1.0.0\n */\n basic_json(size_type cnt, const basic_json& val)\n : m_type(value_t::array)\n {\n m_value.array = create(cnt, val);\n assert_invariant();\n }\n\n /*!\n @brief construct a JSON container given an iterator range\n\n Constructs the JSON value with the contents of the range `[first, last)`.\n The semantics depends on the different types a JSON value can have:\n - In case of primitive types (number, boolean, or string), @a first must\n be `begin()` and @a last must be `end()`. In this case, the value is\n copied. Otherwise, std::out_of_range is thrown.\n - In case of structured types (array, object), the constructor behaves as\n similar versions for `std::vector`.\n - In case of a null type, std::domain_error is thrown.\n\n @tparam InputIT an input iterator type (@ref iterator or @ref\n const_iterator)\n\n @param[in] first begin of the range to copy from (included)\n @param[in] last end of the range to copy from (excluded)\n\n @pre Iterators @a first and @a last must be initialized. **This\n precondition is enforced with an assertion.**\n\n @throw std::domain_error if iterators are not compatible; that is, do not\n belong to the same JSON value; example: `\"iterators are not compatible\"`\n @throw std::out_of_range if iterators are for a primitive type (number,\n boolean, or string) where an out of range error can be detected easily;\n example: `\"iterators out of range\"`\n @throw std::bad_alloc if allocation for object, array, or string fails\n @throw std::domain_error if called with a null value; example: `\"cannot\n use construct with iterators from null\"`\n\n @complexity Linear in distance between @a first and @a last.\n\n @liveexample{The example below shows several ways to create JSON values by\n specifying a subrange with iterators.,basic_json__InputIt_InputIt}\n\n @since version 1.0.0\n */\n template::value or\n std::is_same::value, int>::type = 0>\n basic_json(InputIT first, InputIT last)\n {\n assert(first.m_object != nullptr);\n assert(last.m_object != nullptr);\n\n // make sure iterator fits the current value\n if (first.m_object != last.m_object)\n {\n JSON_THROW(std::domain_error(\"iterators are not compatible\"));\n }\n\n // copy type from first iterator\n m_type = first.m_object->m_type;\n\n // check if iterator range is complete for primitive values\n switch (m_type)\n {\n case value_t::boolean:\n case value_t::number_float:\n case value_t::number_integer:\n case value_t::number_unsigned:\n case value_t::string:\n {\n if (not first.m_it.primitive_iterator.is_begin() or not last.m_it.primitive_iterator.is_end())\n {\n JSON_THROW(std::out_of_range(\"iterators out of range\"));\n }\n break;\n }\n\n default:\n {\n break;\n }\n }\n\n switch (m_type)\n {\n case value_t::number_integer:\n {\n m_value.number_integer = first.m_object->m_value.number_integer;\n break;\n }\n\n case value_t::number_unsigned:\n {\n m_value.number_unsigned = first.m_object->m_value.number_unsigned;\n break;\n }\n\n case value_t::number_float:\n {\n m_value.number_float = first.m_object->m_value.number_float;\n break;\n }\n\n case value_t::boolean:\n {\n m_value.boolean = first.m_object->m_value.boolean;\n break;\n }\n\n case value_t::string:\n {\n m_value = *first.m_object->m_value.string;\n break;\n }\n\n case value_t::object:\n {\n m_value.object = create(first.m_it.object_iterator,\n last.m_it.object_iterator);\n break;\n }\n\n case value_t::array:\n {\n m_value.array = create(first.m_it.array_iterator,\n last.m_it.array_iterator);\n break;\n }\n\n default:\n {\n JSON_THROW(std::domain_error(\"cannot use construct with iterators from \" + first.m_object->type_name()));\n }\n }\n\n assert_invariant();\n }\n\n\n ///////////////////////////////////////\n // other constructors and destructor //\n ///////////////////////////////////////\n\n /*!\n @brief copy constructor\n\n Creates a copy of a given JSON value.\n\n @param[in] other the JSON value to copy\n\n @complexity Linear in the size of @a other.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is linear.\n - As postcondition, it holds: `other == basic_json(other)`.\n\n @throw std::bad_alloc if allocation for object, array, or string fails.\n\n @liveexample{The following code shows an example for the copy\n constructor.,basic_json__basic_json}\n\n @since version 1.0.0\n */\n basic_json(const basic_json& other)\n : m_type(other.m_type)\n {\n // check of passed value is valid\n other.assert_invariant();\n\n switch (m_type)\n {\n case value_t::object:\n {\n m_value = *other.m_value.object;\n break;\n }\n\n case value_t::array:\n {\n m_value = *other.m_value.array;\n break;\n }\n\n case value_t::string:\n {\n m_value = *other.m_value.string;\n break;\n }\n\n case value_t::boolean:\n {\n m_value = other.m_value.boolean;\n break;\n }\n\n case value_t::number_integer:\n {\n m_value = other.m_value.number_integer;\n break;\n }\n\n case value_t::number_unsigned:\n {\n m_value = other.m_value.number_unsigned;\n break;\n }\n\n case value_t::number_float:\n {\n m_value = other.m_value.number_float;\n break;\n }\n\n default:\n {\n break;\n }\n }\n\n assert_invariant();\n }\n\n /*!\n @brief move constructor\n\n Move constructor. Constructs a JSON value with the contents of the given\n value @a other using move semantics. It \"steals\" the resources from @a\n other and leaves it as JSON null value.\n\n @param[in,out] other value to move to this object\n\n @post @a other is a JSON null value\n\n @complexity Constant.\n\n @liveexample{The code below shows the move constructor explicitly called\n via std::move.,basic_json__moveconstructor}\n\n @since version 1.0.0\n */\n basic_json(basic_json&& other) noexcept\n : m_type(std::move(other.m_type)),\n m_value(std::move(other.m_value))\n {\n // check that passed value is valid\n other.assert_invariant();\n\n // invalidate payload\n other.m_type = value_t::null;\n other.m_value = {};\n\n assert_invariant();\n }\n\n /*!\n @brief copy assignment\n\n Copy assignment operator. Copies a JSON value via the \"copy and swap\"\n strategy: It is expressed in terms of the copy constructor, destructor,\n and the swap() member function.\n\n @param[in] other value to copy from\n\n @complexity Linear.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is linear.\n\n @liveexample{The code below shows and example for the copy assignment. It\n creates a copy of value `a` which is then swapped with `b`. Finally\\, the\n copy of `a` (which is the null value after the swap) is\n destroyed.,basic_json__copyassignment}\n\n @since version 1.0.0\n */\n reference& operator=(basic_json other) noexcept (\n std::is_nothrow_move_constructible::value and\n std::is_nothrow_move_assignable::value and\n std::is_nothrow_move_constructible::value and\n std::is_nothrow_move_assignable::value\n )\n {\n // check that passed value is valid\n other.assert_invariant();\n\n using std::swap;\n swap(m_type, other.m_type);\n swap(m_value, other.m_value);\n\n assert_invariant();\n return *this;\n }\n\n /*!\n @brief destructor\n\n Destroys the JSON value and frees all allocated memory.\n\n @complexity Linear.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is linear.\n - All stored elements are destroyed and all memory is freed.\n\n @since version 1.0.0\n */\n ~basic_json()\n {\n assert_invariant();\n\n switch (m_type)\n {\n case value_t::object:\n {\n AllocatorType alloc;\n alloc.destroy(m_value.object);\n alloc.deallocate(m_value.object, 1);\n break;\n }\n\n case value_t::array:\n {\n AllocatorType alloc;\n alloc.destroy(m_value.array);\n alloc.deallocate(m_value.array, 1);\n break;\n }\n\n case value_t::string:\n {\n AllocatorType alloc;\n alloc.destroy(m_value.string);\n alloc.deallocate(m_value.string, 1);\n break;\n }\n\n default:\n {\n // all other types need no specific destructor\n break;\n }\n }\n }\n\n /// @}\n\n public:\n ///////////////////////\n // object inspection //\n ///////////////////////\n\n /// @name object inspection\n /// Functions to inspect the type of a JSON value.\n /// @{\n\n /*!\n @brief serialization\n\n Serialization function for JSON values. The function tries to mimic\n Python's `json.dumps()` function, and currently supports its @a indent\n parameter.\n\n @param[in] indent If indent is nonnegative, then array elements and object\n members will be pretty-printed with that indent level. An indent level of\n `0` will only insert newlines. `-1` (the default) selects the most compact\n representation.\n\n @return string containing the serialization of the JSON value\n\n @complexity Linear.\n\n @liveexample{The following example shows the effect of different @a indent\n parameters to the result of the serialization.,dump}\n\n @see https://docs.python.org/2/library/json.html#json.dump\n\n @since version 1.0.0\n */\n string_t dump(const int indent = -1) const\n {\n std::stringstream ss;\n serializer s(ss);\n\n if (indent >= 0)\n {\n s.dump(*this, true, static_cast(indent));\n }\n else\n {\n s.dump(*this, false, 0);\n }\n\n return ss.str();\n }\n\n /*!\n @brief return the type of the JSON value (explicit)\n\n Return the type of the JSON value as a value from the @ref value_t\n enumeration.\n\n @return the type of the JSON value\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `type()` for all JSON\n types.,type}\n\n @since version 1.0.0\n */\n constexpr value_t type() const noexcept\n {\n return m_type;\n }\n\n /*!\n @brief return whether type is primitive\n\n This function returns true iff the JSON type is primitive (string, number,\n boolean, or null).\n\n @return `true` if type is primitive (string, number, boolean, or null),\n `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_primitive()` for all JSON\n types.,is_primitive}\n\n @sa @ref is_structured() -- returns whether JSON value is structured\n @sa @ref is_null() -- returns whether JSON value is `null`\n @sa @ref is_string() -- returns whether JSON value is a string\n @sa @ref is_boolean() -- returns whether JSON value is a boolean\n @sa @ref is_number() -- returns whether JSON value is a number\n\n @since version 1.0.0\n */\n constexpr bool is_primitive() const noexcept\n {\n return is_null() or is_string() or is_boolean() or is_number();\n }\n\n /*!\n @brief return whether type is structured\n\n This function returns true iff the JSON type is structured (array or\n object).\n\n @return `true` if type is structured (array or object), `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_structured()` for all JSON\n types.,is_structured}\n\n @sa @ref is_primitive() -- returns whether value is primitive\n @sa @ref is_array() -- returns whether value is an array\n @sa @ref is_object() -- returns whether value is an object\n\n @since version 1.0.0\n */\n constexpr bool is_structured() const noexcept\n {\n return is_array() or is_object();\n }\n\n /*!\n @brief return whether value is null\n\n This function returns true iff the JSON value is null.\n\n @return `true` if type is null, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_null()` for all JSON\n types.,is_null}\n\n @since version 1.0.0\n */\n constexpr bool is_null() const noexcept\n {\n return m_type == value_t::null;\n }\n\n /*!\n @brief return whether value is a boolean\n\n This function returns true iff the JSON value is a boolean.\n\n @return `true` if type is boolean, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_boolean()` for all JSON\n types.,is_boolean}\n\n @since version 1.0.0\n */\n constexpr bool is_boolean() const noexcept\n {\n return m_type == value_t::boolean;\n }\n\n /*!\n @brief return whether value is a number\n\n This function returns true iff the JSON value is a number. This includes\n both integer and floating-point values.\n\n @return `true` if type is number (regardless whether integer, unsigned\n integer or floating-type), `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_number()` for all JSON\n types.,is_number}\n\n @sa @ref is_number_integer() -- check if value is an integer or unsigned\n integer number\n @sa @ref is_number_unsigned() -- check if value is an unsigned integer\n number\n @sa @ref is_number_float() -- check if value is a floating-point number\n\n @since version 1.0.0\n */\n constexpr bool is_number() const noexcept\n {\n return is_number_integer() or is_number_float();\n }\n\n /*!\n @brief return whether value is an integer number\n\n This function returns true iff the JSON value is an integer or unsigned\n integer number. This excludes floating-point values.\n\n @return `true` if type is an integer or unsigned integer number, `false`\n otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_number_integer()` for all\n JSON types.,is_number_integer}\n\n @sa @ref is_number() -- check if value is a number\n @sa @ref is_number_unsigned() -- check if value is an unsigned integer\n number\n @sa @ref is_number_float() -- check if value is a floating-point number\n\n @since version 1.0.0\n */\n constexpr bool is_number_integer() const noexcept\n {\n return m_type == value_t::number_integer or m_type == value_t::number_unsigned;\n }\n\n /*!\n @brief return whether value is an unsigned integer number\n\n This function returns true iff the JSON value is an unsigned integer\n number. This excludes floating-point and (signed) integer values.\n\n @return `true` if type is an unsigned integer number, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_number_unsigned()` for all\n JSON types.,is_number_unsigned}\n\n @sa @ref is_number() -- check if value is a number\n @sa @ref is_number_integer() -- check if value is an integer or unsigned\n integer number\n @sa @ref is_number_float() -- check if value is a floating-point number\n\n @since version 2.0.0\n */\n constexpr bool is_number_unsigned() const noexcept\n {\n return m_type == value_t::number_unsigned;\n }\n\n /*!\n @brief return whether value is a floating-point number\n\n This function returns true iff the JSON value is a floating-point number.\n This excludes integer and unsigned integer values.\n\n @return `true` if type is a floating-point number, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_number_float()` for all\n JSON types.,is_number_float}\n\n @sa @ref is_number() -- check if value is number\n @sa @ref is_number_integer() -- check if value is an integer number\n @sa @ref is_number_unsigned() -- check if value is an unsigned integer\n number\n\n @since version 1.0.0\n */\n constexpr bool is_number_float() const noexcept\n {\n return m_type == value_t::number_float;\n }\n\n /*!\n @brief return whether value is an object\n\n This function returns true iff the JSON value is an object.\n\n @return `true` if type is object, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_object()` for all JSON\n types.,is_object}\n\n @since version 1.0.0\n */\n constexpr bool is_object() const noexcept\n {\n return m_type == value_t::object;\n }\n\n /*!\n @brief return whether value is an array\n\n This function returns true iff the JSON value is an array.\n\n @return `true` if type is array, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_array()` for all JSON\n types.,is_array}\n\n @since version 1.0.0\n */\n constexpr bool is_array() const noexcept\n {\n return m_type == value_t::array;\n }\n\n /*!\n @brief return whether value is a string\n\n This function returns true iff the JSON value is a string.\n\n @return `true` if type is string, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_string()` for all JSON\n types.,is_string}\n\n @since version 1.0.0\n */\n constexpr bool is_string() const noexcept\n {\n return m_type == value_t::string;\n }\n\n /*!\n @brief return whether value is discarded\n\n This function returns true iff the JSON value was discarded during parsing\n with a callback function (see @ref parser_callback_t).\n\n @note This function will always be `false` for JSON values after parsing.\n That is, discarded values can only occur during parsing, but will be\n removed when inside a structured value or replaced by null in other cases.\n\n @return `true` if type is discarded, `false` otherwise.\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies `is_discarded()` for all JSON\n types.,is_discarded}\n\n @since version 1.0.0\n */\n constexpr bool is_discarded() const noexcept\n {\n return m_type == value_t::discarded;\n }\n\n /*!\n @brief return the type of the JSON value (implicit)\n\n Implicitly return the type of the JSON value as a value from the @ref\n value_t enumeration.\n\n @return the type of the JSON value\n\n @complexity Constant.\n\n @exceptionsafety No-throw guarantee: this member function never throws\n exceptions.\n\n @liveexample{The following code exemplifies the @ref value_t operator for\n all JSON types.,operator__value_t}\n\n @since version 1.0.0\n */\n constexpr operator value_t() const noexcept\n {\n return m_type;\n }\n\n /// @}\n\n private:\n //////////////////\n // value access //\n //////////////////\n\n /// get a boolean (explicit)\n boolean_t get_impl(boolean_t* /*unused*/) const\n {\n if (is_boolean())\n {\n return m_value.boolean;\n }\n\n JSON_THROW(std::domain_error(\"type must be boolean, but is \" + type_name()));\n }\n\n /// get a pointer to the value (object)\n object_t* get_impl_ptr(object_t* /*unused*/) noexcept\n {\n return is_object() ? m_value.object : nullptr;\n }\n\n /// get a pointer to the value (object)\n constexpr const object_t* get_impl_ptr(const object_t* /*unused*/) const noexcept\n {\n return is_object() ? m_value.object : nullptr;\n }\n\n /// get a pointer to the value (array)\n array_t* get_impl_ptr(array_t* /*unused*/) noexcept\n {\n return is_array() ? m_value.array : nullptr;\n }\n\n /// get a pointer to the value (array)\n constexpr const array_t* get_impl_ptr(const array_t* /*unused*/) const noexcept\n {\n return is_array() ? m_value.array : nullptr;\n }\n\n /// get a pointer to the value (string)\n string_t* get_impl_ptr(string_t* /*unused*/) noexcept\n {\n return is_string() ? m_value.string : nullptr;\n }\n\n /// get a pointer to the value (string)\n constexpr const string_t* get_impl_ptr(const string_t* /*unused*/) const noexcept\n {\n return is_string() ? m_value.string : nullptr;\n }\n\n /// get a pointer to the value (boolean)\n boolean_t* get_impl_ptr(boolean_t* /*unused*/) noexcept\n {\n return is_boolean() ? &m_value.boolean : nullptr;\n }\n\n /// get a pointer to the value (boolean)\n constexpr const boolean_t* get_impl_ptr(const boolean_t* /*unused*/) const noexcept\n {\n return is_boolean() ? &m_value.boolean : nullptr;\n }\n\n /// get a pointer to the value (integer number)\n number_integer_t* get_impl_ptr(number_integer_t* /*unused*/) noexcept\n {\n return is_number_integer() ? &m_value.number_integer : nullptr;\n }\n\n /// get a pointer to the value (integer number)\n constexpr const number_integer_t* get_impl_ptr(const number_integer_t* /*unused*/) const noexcept\n {\n return is_number_integer() ? &m_value.number_integer : nullptr;\n }\n\n /// get a pointer to the value (unsigned number)\n number_unsigned_t* get_impl_ptr(number_unsigned_t* /*unused*/) noexcept\n {\n return is_number_unsigned() ? &m_value.number_unsigned : nullptr;\n }\n\n /// get a pointer to the value (unsigned number)\n constexpr const number_unsigned_t* get_impl_ptr(const number_unsigned_t* /*unused*/) const noexcept\n {\n return is_number_unsigned() ? &m_value.number_unsigned : nullptr;\n }\n\n /// get a pointer to the value (floating-point number)\n number_float_t* get_impl_ptr(number_float_t* /*unused*/) noexcept\n {\n return is_number_float() ? &m_value.number_float : nullptr;\n }\n\n /// get a pointer to the value (floating-point number)\n constexpr const number_float_t* get_impl_ptr(const number_float_t* /*unused*/) const noexcept\n {\n return is_number_float() ? &m_value.number_float : nullptr;\n }\n\n /*!\n @brief helper function to implement get_ref()\n\n This funcion helps to implement get_ref() without code duplication for\n const and non-const overloads\n\n @tparam ThisType will be deduced as `basic_json` or `const basic_json`\n\n @throw std::domain_error if ReferenceType does not match underlying value\n type of the current JSON\n */\n template\n static ReferenceType get_ref_impl(ThisType& obj)\n {\n // helper type\n using PointerType = typename std::add_pointer::type;\n\n // delegate the call to get_ptr<>()\n auto ptr = obj.template get_ptr();\n\n if (ptr != nullptr)\n {\n return *ptr;\n }\n\n JSON_THROW(std::domain_error(\"incompatible ReferenceType for get_ref, actual type is \" +\n obj.type_name()));\n }\n\n public:\n /// @name value access\n /// Direct access to the stored value of a JSON value.\n /// @{\n\n /*!\n @brief get special-case overload\n\n This overloads avoids a lot of template boilerplate, it can be seen as the\n identity method\n\n @tparam BasicJsonType == @ref basic_json\n\n @return a copy of *this\n\n @complexity Constant.\n\n @since version 2.1.0\n */\n template <\n typename BasicJsonType,\n detail::enable_if_t::type,\n basic_json_t>::value,\n int> = 0 >\n basic_json get() const\n {\n return *this;\n }\n\n /*!\n @brief get a value (explicit)\n\n Explicit type conversion between the JSON value and a compatible value\n which is [CopyConstructible](http://en.cppreference.com/w/cpp/concept/CopyConstructible)\n and [DefaultConstructible](http://en.cppreference.com/w/cpp/concept/DefaultConstructible).\n The value is converted by calling the @ref json_serializer\n `from_json()` method.\n\n The function is equivalent to executing\n @code {.cpp}\n ValueType ret;\n JSONSerializer::from_json(*this, ret);\n return ret;\n @endcode\n\n This overloads is chosen if:\n - @a ValueType is not @ref basic_json,\n - @ref json_serializer has a `from_json()` method of the form\n `void from_json(const @ref basic_json&, ValueType&)`, and\n - @ref json_serializer does not have a `from_json()` method of\n the form `ValueType from_json(const @ref basic_json&)`\n\n @tparam ValueTypeCV the provided value type\n @tparam ValueType the returned value type\n\n @return copy of the JSON value, converted to @a ValueType\n\n @throw what @ref json_serializer `from_json()` method throws\n\n @liveexample{The example below shows several conversions from JSON values\n to other types. There a few things to note: (1) Floating-point numbers can\n be converted to integers\\, (2) A JSON array can be converted to a standard\n `std::vector`\\, (3) A JSON object can be converted to C++\n associative containers such as `std::unordered_map`.,get__ValueType_const}\n\n @since version 2.1.0\n */\n template <\n typename ValueTypeCV,\n typename ValueType = detail::uncvref_t,\n detail::enable_if_t <\n not std::is_same::value and\n detail::has_from_json::value and\n not detail::has_non_default_from_json::value,\n int > = 0 >\n ValueType get() const noexcept(noexcept(\n JSONSerializer::from_json(std::declval(), std::declval())))\n {\n // we cannot static_assert on ValueTypeCV being non-const, because\n // there is support for get(), which is why we\n // still need the uncvref\n static_assert(not std::is_reference::value,\n \"get() cannot be used with reference types, you might want to use get_ref()\");\n static_assert(std::is_default_constructible::value,\n \"types must be DefaultConstructible when used with get()\");\n\n ValueType ret;\n JSONSerializer::from_json(*this, ret);\n return ret;\n }\n\n /*!\n @brief get a value (explicit); special case\n\n Explicit type conversion between the JSON value and a compatible value\n which is **not** [CopyConstructible](http://en.cppreference.com/w/cpp/concept/CopyConstructible)\n and **not** [DefaultConstructible](http://en.cppreference.com/w/cpp/concept/DefaultConstructible).\n The value is converted by calling the @ref json_serializer\n `from_json()` method.\n\n The function is equivalent to executing\n @code {.cpp}\n return JSONSerializer::from_json(*this);\n @endcode\n\n This overloads is chosen if:\n - @a ValueType is not @ref basic_json and\n - @ref json_serializer has a `from_json()` method of the form\n `ValueType from_json(const @ref basic_json&)`\n\n @note If @ref json_serializer has both overloads of\n `from_json()`, this one is chosen.\n\n @tparam ValueTypeCV the provided value type\n @tparam ValueType the returned value type\n\n @return copy of the JSON value, converted to @a ValueType\n\n @throw what @ref json_serializer `from_json()` method throws\n\n @since version 2.1.0\n */\n template <\n typename ValueTypeCV,\n typename ValueType = detail::uncvref_t,\n detail::enable_if_t::value and\n detail::has_non_default_from_json::value, int> = 0 >\n ValueType get() const noexcept(noexcept(\n JSONSerializer::from_json(std::declval())))\n {\n static_assert(not std::is_reference::value,\n \"get() cannot be used with reference types, you might want to use get_ref()\");\n return JSONSerializer::from_json(*this);\n }\n\n /*!\n @brief get a pointer value (explicit)\n\n Explicit pointer access to the internally stored JSON value. No copies are\n made.\n\n @warning The pointer becomes invalid if the underlying JSON object\n changes.\n\n @tparam PointerType pointer type; must be a pointer to @ref array_t, @ref\n object_t, @ref string_t, @ref boolean_t, @ref number_integer_t,\n @ref number_unsigned_t, or @ref number_float_t.\n\n @return pointer to the internally stored JSON value if the requested\n pointer type @a PointerType fits to the JSON value; `nullptr` otherwise\n\n @complexity Constant.\n\n @liveexample{The example below shows how pointers to internal values of a\n JSON value can be requested. Note that no type conversions are made and a\n `nullptr` is returned if the value and the requested pointer type does not\n match.,get__PointerType}\n\n @sa @ref get_ptr() for explicit pointer-member access\n\n @since version 1.0.0\n */\n template::value, int>::type = 0>\n PointerType get() noexcept\n {\n // delegate the call to get_ptr\n return get_ptr();\n }\n\n /*!\n @brief get a pointer value (explicit)\n @copydoc get()\n */\n template::value, int>::type = 0>\n constexpr const PointerType get() const noexcept\n {\n // delegate the call to get_ptr\n return get_ptr();\n }\n\n /*!\n @brief get a pointer value (implicit)\n\n Implicit pointer access to the internally stored JSON value. No copies are\n made.\n\n @warning Writing data to the pointee of the result yields an undefined\n state.\n\n @tparam PointerType pointer type; must be a pointer to @ref array_t, @ref\n object_t, @ref string_t, @ref boolean_t, @ref number_integer_t,\n @ref number_unsigned_t, or @ref number_float_t. Enforced by a static\n assertion.\n\n @return pointer to the internally stored JSON value if the requested\n pointer type @a PointerType fits to the JSON value; `nullptr` otherwise\n\n @complexity Constant.\n\n @liveexample{The example below shows how pointers to internal values of a\n JSON value can be requested. Note that no type conversions are made and a\n `nullptr` is returned if the value and the requested pointer type does not\n match.,get_ptr}\n\n @since version 1.0.0\n */\n template::value, int>::type = 0>\n PointerType get_ptr() noexcept\n {\n // get the type of the PointerType (remove pointer and const)\n using pointee_t = typename std::remove_const::type>::type>::type;\n // make sure the type matches the allowed types\n static_assert(\n std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n , \"incompatible pointer type\");\n\n // delegate the call to get_impl_ptr<>()\n return get_impl_ptr(static_cast(nullptr));\n }\n\n /*!\n @brief get a pointer value (implicit)\n @copydoc get_ptr()\n */\n template::value and\n std::is_const::type>::value, int>::type = 0>\n constexpr const PointerType get_ptr() const noexcept\n {\n // get the type of the PointerType (remove pointer and const)\n using pointee_t = typename std::remove_const::type>::type>::type;\n // make sure the type matches the allowed types\n static_assert(\n std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n or std::is_same::value\n , \"incompatible pointer type\");\n\n // delegate the call to get_impl_ptr<>() const\n return get_impl_ptr(static_cast(nullptr));\n }\n\n /*!\n @brief get a reference value (implicit)\n\n Implicit reference access to the internally stored JSON value. No copies\n are made.\n\n @warning Writing data to the referee of the result yields an undefined\n state.\n\n @tparam ReferenceType reference type; must be a reference to @ref array_t,\n @ref object_t, @ref string_t, @ref boolean_t, @ref number_integer_t, or\n @ref number_float_t. Enforced by static assertion.\n\n @return reference to the internally stored JSON value if the requested\n reference type @a ReferenceType fits to the JSON value; throws\n std::domain_error otherwise\n\n @throw std::domain_error in case passed type @a ReferenceType is\n incompatible with the stored JSON value\n\n @complexity Constant.\n\n @liveexample{The example shows several calls to `get_ref()`.,get_ref}\n\n @since version 1.1.0\n */\n template::value, int>::type = 0>\n ReferenceType get_ref()\n {\n // delegate call to get_ref_impl\n return get_ref_impl(*this);\n }\n\n /*!\n @brief get a reference value (implicit)\n @copydoc get_ref()\n */\n template::value and\n std::is_const::type>::value, int>::type = 0>\n ReferenceType get_ref() const\n {\n // delegate call to get_ref_impl\n return get_ref_impl(*this);\n }\n\n /*!\n @brief get a value (implicit)\n\n Implicit type conversion between the JSON value and a compatible value.\n The call is realized by calling @ref get() const.\n\n @tparam ValueType non-pointer type compatible to the JSON value, for\n instance `int` for JSON integer numbers, `bool` for JSON booleans, or\n `std::vector` types for JSON arrays. The character type of @ref string_t\n as well as an initializer list of this type is excluded to avoid\n ambiguities as these types implicitly convert to `std::string`.\n\n @return copy of the JSON value, converted to type @a ValueType\n\n @throw std::domain_error in case passed type @a ValueType is incompatible\n to JSON, thrown by @ref get() const\n\n @complexity Linear in the size of the JSON value.\n\n @liveexample{The example below shows several conversions from JSON values\n to other types. There a few things to note: (1) Floating-point numbers can\n be converted to integers\\, (2) A JSON array can be converted to a standard\n `std::vector`\\, (3) A JSON object can be converted to C++\n associative containers such as `std::unordered_map`.,operator__ValueType}\n\n @since version 1.0.0\n */\n template < typename ValueType, typename std::enable_if <\n not std::is_pointer::value and\n not std::is_same::value\n#ifndef _MSC_VER // fix for issue #167 operator<< ambiguity under VS2015\n and not std::is_same>::value\n#endif\n , int >::type = 0 >\n operator ValueType() const\n {\n // delegate the call to get<>() const\n return get();\n }\n\n /// @}\n\n\n ////////////////////\n // element access //\n ////////////////////\n\n /// @name element access\n /// Access to the JSON value.\n /// @{\n\n /*!\n @brief access specified array element with bounds checking\n\n Returns a reference to the element at specified location @a idx, with\n bounds checking.\n\n @param[in] idx index of the element to access\n\n @return reference to the element at index @a idx\n\n @throw std::domain_error if the JSON value is not an array; example:\n `\"cannot use at() with string\"`\n @throw std::out_of_range if the index @a idx is out of range of the array;\n that is, `idx >= size()`; example: `\"array index 7 is out of range\"`\n\n @complexity Constant.\n\n @liveexample{The example below shows how array elements can be read and\n written using `at()`.,at__size_type}\n\n @since version 1.0.0\n */\n reference at(size_type idx)\n {\n // at only works for arrays\n if (is_array())\n {\n JSON_TRY\n {\n return m_value.array->at(idx);\n }\n JSON_CATCH (std::out_of_range&)\n {\n // create better exception explanation\n JSON_THROW(std::out_of_range(\"array index \" + std::to_string(idx) + \" is out of range\"));\n }\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use at() with \" + type_name()));\n }\n }\n\n /*!\n @brief access specified array element with bounds checking\n\n Returns a const reference to the element at specified location @a idx,\n with bounds checking.\n\n @param[in] idx index of the element to access\n\n @return const reference to the element at index @a idx\n\n @throw std::domain_error if the JSON value is not an array; example:\n `\"cannot use at() with string\"`\n @throw std::out_of_range if the index @a idx is out of range of the array;\n that is, `idx >= size()`; example: `\"array index 7 is out of range\"`\n\n @complexity Constant.\n\n @liveexample{The example below shows how array elements can be read using\n `at()`.,at__size_type_const}\n\n @since version 1.0.0\n */\n const_reference at(size_type idx) const\n {\n // at only works for arrays\n if (is_array())\n {\n JSON_TRY\n {\n return m_value.array->at(idx);\n }\n JSON_CATCH (std::out_of_range&)\n {\n // create better exception explanation\n JSON_THROW(std::out_of_range(\"array index \" + std::to_string(idx) + \" is out of range\"));\n }\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use at() with \" + type_name()));\n }\n }\n\n /*!\n @brief access specified object element with bounds checking\n\n Returns a reference to the element at with specified key @a key, with\n bounds checking.\n\n @param[in] key key of the element to access\n\n @return reference to the element at key @a key\n\n @throw std::domain_error if the JSON value is not an object; example:\n `\"cannot use at() with boolean\"`\n @throw std::out_of_range if the key @a key is is not stored in the object;\n that is, `find(key) == end()`; example: `\"key \"the fast\" not found\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read and\n written using `at()`.,at__object_t_key_type}\n\n @sa @ref operator[](const typename object_t::key_type&) for unchecked\n access by reference\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n reference at(const typename object_t::key_type& key)\n {\n // at only works for objects\n if (is_object())\n {\n JSON_TRY\n {\n return m_value.object->at(key);\n }\n JSON_CATCH (std::out_of_range&)\n {\n // create better exception explanation\n JSON_THROW(std::out_of_range(\"key '\" + key + \"' not found\"));\n }\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use at() with \" + type_name()));\n }\n }\n\n /*!\n @brief access specified object element with bounds checking\n\n Returns a const reference to the element at with specified key @a key,\n with bounds checking.\n\n @param[in] key key of the element to access\n\n @return const reference to the element at key @a key\n\n @throw std::domain_error if the JSON value is not an object; example:\n `\"cannot use at() with boolean\"`\n @throw std::out_of_range if the key @a key is is not stored in the object;\n that is, `find(key) == end()`; example: `\"key \"the fast\" not found\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read using\n `at()`.,at__object_t_key_type_const}\n\n @sa @ref operator[](const typename object_t::key_type&) for unchecked\n access by reference\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n const_reference at(const typename object_t::key_type& key) const\n {\n // at only works for objects\n if (is_object())\n {\n JSON_TRY\n {\n return m_value.object->at(key);\n }\n JSON_CATCH (std::out_of_range&)\n {\n // create better exception explanation\n JSON_THROW(std::out_of_range(\"key '\" + key + \"' not found\"));\n }\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use at() with \" + type_name()));\n }\n }\n\n /*!\n @brief access specified array element\n\n Returns a reference to the element at specified location @a idx.\n\n @note If @a idx is beyond the range of the array (i.e., `idx >= size()`),\n then the array is silently filled up with `null` values to make `idx` a\n valid reference to the last stored element.\n\n @param[in] idx index of the element to access\n\n @return reference to the element at index @a idx\n\n @throw std::domain_error if JSON is not an array or null; example:\n `\"cannot use operator[] with string\"`\n\n @complexity Constant if @a idx is in the range of the array. Otherwise\n linear in `idx - size()`.\n\n @liveexample{The example below shows how array elements can be read and\n written using `[]` operator. Note the addition of `null`\n values.,operatorarray__size_type}\n\n @since version 1.0.0\n */\n reference operator[](size_type idx)\n {\n // implicitly convert null value to an empty array\n if (is_null())\n {\n m_type = value_t::array;\n m_value.array = create();\n assert_invariant();\n }\n\n // operator[] only works for arrays\n if (is_array())\n {\n // fill up array with null values if given idx is outside range\n if (idx >= m_value.array->size())\n {\n m_value.array->insert(m_value.array->end(),\n idx - m_value.array->size() + 1,\n basic_json());\n }\n\n return m_value.array->operator[](idx);\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief access specified array element\n\n Returns a const reference to the element at specified location @a idx.\n\n @param[in] idx index of the element to access\n\n @return const reference to the element at index @a idx\n\n @throw std::domain_error if JSON is not an array; example: `\"cannot use\n operator[] with null\"`\n\n @complexity Constant.\n\n @liveexample{The example below shows how array elements can be read using\n the `[]` operator.,operatorarray__size_type_const}\n\n @since version 1.0.0\n */\n const_reference operator[](size_type idx) const\n {\n // const operator[] only works for arrays\n if (is_array())\n {\n return m_value.array->operator[](idx);\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief access specified object element\n\n Returns a reference to the element at with specified key @a key.\n\n @note If @a key is not found in the object, then it is silently added to\n the object and filled with a `null` value to make `key` a valid reference.\n In case the value was `null` before, it is converted to an object.\n\n @param[in] key key of the element to access\n\n @return reference to the element at key @a key\n\n @throw std::domain_error if JSON is not an object or null; example:\n `\"cannot use operator[] with string\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read and\n written using the `[]` operator.,operatorarray__key_type}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n reference operator[](const typename object_t::key_type& key)\n {\n // implicitly convert null value to an empty object\n if (is_null())\n {\n m_type = value_t::object;\n m_value.object = create();\n assert_invariant();\n }\n\n // operator[] only works for objects\n if (is_object())\n {\n return m_value.object->operator[](key);\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief read-only access specified object element\n\n Returns a const reference to the element at with specified key @a key. No\n bounds checking is performed.\n\n @warning If the element with key @a key does not exist, the behavior is\n undefined.\n\n @param[in] key key of the element to access\n\n @return const reference to the element at key @a key\n\n @pre The element with key @a key must exist. **This precondition is\n enforced with an assertion.**\n\n @throw std::domain_error if JSON is not an object; example: `\"cannot use\n operator[] with null\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read using\n the `[]` operator.,operatorarray__key_type_const}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n const_reference operator[](const typename object_t::key_type& key) const\n {\n // const operator[] only works for objects\n if (is_object())\n {\n assert(m_value.object->find(key) != m_value.object->end());\n return m_value.object->find(key)->second;\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief access specified object element\n\n Returns a reference to the element at with specified key @a key.\n\n @note If @a key is not found in the object, then it is silently added to\n the object and filled with a `null` value to make `key` a valid reference.\n In case the value was `null` before, it is converted to an object.\n\n @param[in] key key of the element to access\n\n @return reference to the element at key @a key\n\n @throw std::domain_error if JSON is not an object or null; example:\n `\"cannot use operator[] with string\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read and\n written using the `[]` operator.,operatorarray__key_type}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n template\n reference operator[](T * (&key)[n])\n {\n return operator[](static_cast(key));\n }\n\n /*!\n @brief read-only access specified object element\n\n Returns a const reference to the element at with specified key @a key. No\n bounds checking is performed.\n\n @warning If the element with key @a key does not exist, the behavior is\n undefined.\n\n @note This function is required for compatibility reasons with Clang.\n\n @param[in] key key of the element to access\n\n @return const reference to the element at key @a key\n\n @throw std::domain_error if JSON is not an object; example: `\"cannot use\n operator[] with null\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read using\n the `[]` operator.,operatorarray__key_type_const}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.0.0\n */\n template\n const_reference operator[](T * (&key)[n]) const\n {\n return operator[](static_cast(key));\n }\n\n /*!\n @brief access specified object element\n\n Returns a reference to the element at with specified key @a key.\n\n @note If @a key is not found in the object, then it is silently added to\n the object and filled with a `null` value to make `key` a valid reference.\n In case the value was `null` before, it is converted to an object.\n\n @param[in] key key of the element to access\n\n @return reference to the element at key @a key\n\n @throw std::domain_error if JSON is not an object or null; example:\n `\"cannot use operator[] with string\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read and\n written using the `[]` operator.,operatorarray__key_type}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.1.0\n */\n template\n reference operator[](T* key)\n {\n // implicitly convert null to object\n if (is_null())\n {\n m_type = value_t::object;\n m_value = value_t::object;\n assert_invariant();\n }\n\n // at only works for objects\n if (is_object())\n {\n return m_value.object->operator[](key);\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief read-only access specified object element\n\n Returns a const reference to the element at with specified key @a key. No\n bounds checking is performed.\n\n @warning If the element with key @a key does not exist, the behavior is\n undefined.\n\n @param[in] key key of the element to access\n\n @return const reference to the element at key @a key\n\n @pre The element with key @a key must exist. **This precondition is\n enforced with an assertion.**\n\n @throw std::domain_error if JSON is not an object; example: `\"cannot use\n operator[] with null\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be read using\n the `[]` operator.,operatorarray__key_type_const}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref value() for access by value with a default value\n\n @since version 1.1.0\n */\n template\n const_reference operator[](T* key) const\n {\n // at only works for objects\n if (is_object())\n {\n assert(m_value.object->find(key) != m_value.object->end());\n return m_value.object->find(key)->second;\n }\n\n JSON_THROW(std::domain_error(\"cannot use operator[] with \" + type_name()));\n }\n\n /*!\n @brief access specified object element with default value\n\n Returns either a copy of an object's element at the specified key @a key\n or a given default value if no element with key @a key exists.\n\n The function is basically equivalent to executing\n @code {.cpp}\n try {\n return at(key);\n } catch(std::out_of_range) {\n return default_value;\n }\n @endcode\n\n @note Unlike @ref at(const typename object_t::key_type&), this function\n does not throw if the given key @a key was not found.\n\n @note Unlike @ref operator[](const typename object_t::key_type& key), this\n function does not implicitly add an element to the position defined by @a\n key. This function is furthermore also applicable to const objects.\n\n @param[in] key key of the element to access\n @param[in] default_value the value to return if @a key is not found\n\n @tparam ValueType type compatible to JSON values, for instance `int` for\n JSON integer numbers, `bool` for JSON booleans, or `std::vector` types for\n JSON arrays. Note the type of the expected value at @a key and the default\n value @a default_value must be compatible.\n\n @return copy of the element at key @a key or @a default_value if @a key\n is not found\n\n @throw std::domain_error if JSON is not an object; example: `\"cannot use\n value() with null\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be queried\n with a default value.,basic_json__value}\n\n @sa @ref at(const typename object_t::key_type&) for access by reference\n with range checking\n @sa @ref operator[](const typename object_t::key_type&) for unchecked\n access by reference\n\n @since version 1.0.0\n */\n template::value, int>::type = 0>\n ValueType value(const typename object_t::key_type& key, ValueType default_value) const\n {\n // at only works for objects\n if (is_object())\n {\n // if key is found, return value and given default value otherwise\n const auto it = find(key);\n if (it != end())\n {\n return *it;\n }\n\n return default_value;\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use value() with \" + type_name()));\n }\n }\n\n /*!\n @brief overload for a default value of type const char*\n @copydoc basic_json::value(const typename object_t::key_type&, ValueType) const\n */\n string_t value(const typename object_t::key_type& key, const char* default_value) const\n {\n return value(key, string_t(default_value));\n }\n\n /*!\n @brief access specified object element via JSON Pointer with default value\n\n Returns either a copy of an object's element at the specified key @a key\n or a given default value if no element with key @a key exists.\n\n The function is basically equivalent to executing\n @code {.cpp}\n try {\n return at(ptr);\n } catch(std::out_of_range) {\n return default_value;\n }\n @endcode\n\n @note Unlike @ref at(const json_pointer&), this function does not throw\n if the given key @a key was not found.\n\n @param[in] ptr a JSON pointer to the element to access\n @param[in] default_value the value to return if @a ptr found no value\n\n @tparam ValueType type compatible to JSON values, for instance `int` for\n JSON integer numbers, `bool` for JSON booleans, or `std::vector` types for\n JSON arrays. Note the type of the expected value at @a key and the default\n value @a default_value must be compatible.\n\n @return copy of the element at key @a key or @a default_value if @a key\n is not found\n\n @throw std::domain_error if JSON is not an object; example: `\"cannot use\n value() with null\"`\n\n @complexity Logarithmic in the size of the container.\n\n @liveexample{The example below shows how object elements can be queried\n with a default value.,basic_json__value_ptr}\n\n @sa @ref operator[](const json_pointer&) for unchecked access by reference\n\n @since version 2.0.2\n */\n template::value, int>::type = 0>\n ValueType value(const json_pointer& ptr, ValueType default_value) const\n {\n // at only works for objects\n if (is_object())\n {\n // if pointer resolves a value, return it or use default value\n JSON_TRY\n {\n return ptr.get_checked(this);\n }\n JSON_CATCH (std::out_of_range&)\n {\n return default_value;\n }\n }\n\n JSON_THROW(std::domain_error(\"cannot use value() with \" + type_name()));\n }\n\n /*!\n @brief overload for a default value of type const char*\n @copydoc basic_json::value(const json_pointer&, ValueType) const\n */\n string_t value(const json_pointer& ptr, const char* default_value) const\n {\n return value(ptr, string_t(default_value));\n }\n\n /*!\n @brief access the first element\n\n Returns a reference to the first element in the container. For a JSON\n container `c`, the expression `c.front()` is equivalent to `*c.begin()`.\n\n @return In case of a structured type (array or object), a reference to the\n first element is returned. In case of number, string, or boolean values, a\n reference to the value is returned.\n\n @complexity Constant.\n\n @pre The JSON value must not be `null` (would throw `std::out_of_range`)\n or an empty array or object (undefined behavior, **guarded by\n assertions**).\n @post The JSON value remains unchanged.\n\n @throw std::out_of_range when called on `null` value\n\n @liveexample{The following code shows an example for `front()`.,front}\n\n @sa @ref back() -- access the last element\n\n @since version 1.0.0\n */\n reference front()\n {\n return *begin();\n }\n\n /*!\n @copydoc basic_json::front()\n */\n const_reference front() const\n {\n return *cbegin();\n }\n\n /*!\n @brief access the last element\n\n Returns a reference to the last element in the container. For a JSON\n container `c`, the expression `c.back()` is equivalent to\n @code {.cpp}\n auto tmp = c.end();\n --tmp;\n return *tmp;\n @endcode\n\n @return In case of a structured type (array or object), a reference to the\n last element is returned. In case of number, string, or boolean values, a\n reference to the value is returned.\n\n @complexity Constant.\n\n @pre The JSON value must not be `null` (would throw `std::out_of_range`)\n or an empty array or object (undefined behavior, **guarded by\n assertions**).\n @post The JSON value remains unchanged.\n\n @throw std::out_of_range when called on `null` value.\n\n @liveexample{The following code shows an example for `back()`.,back}\n\n @sa @ref front() -- access the first element\n\n @since version 1.0.0\n */\n reference back()\n {\n auto tmp = end();\n --tmp;\n return *tmp;\n }\n\n /*!\n @copydoc basic_json::back()\n */\n const_reference back() const\n {\n auto tmp = cend();\n --tmp;\n return *tmp;\n }\n\n /*!\n @brief remove element given an iterator\n\n Removes the element specified by iterator @a pos. The iterator @a pos must\n be valid and dereferenceable. Thus the `end()` iterator (which is valid,\n but is not dereferenceable) cannot be used as a value for @a pos.\n\n If called on a primitive type other than `null`, the resulting JSON value\n will be `null`.\n\n @param[in] pos iterator to the element to remove\n @return Iterator following the last removed element. If the iterator @a\n pos refers to the last element, the `end()` iterator is returned.\n\n @tparam IteratorType an @ref iterator or @ref const_iterator\n\n @post Invalidates iterators and references at or after the point of the\n erase, including the `end()` iterator.\n\n @throw std::domain_error if called on a `null` value; example: `\"cannot\n use erase() with null\"`\n @throw std::domain_error if called on an iterator which does not belong to\n the current JSON value; example: `\"iterator does not fit current value\"`\n @throw std::out_of_range if called on a primitive type with invalid\n iterator (i.e., any iterator which is not `begin()`); example: `\"iterator\n out of range\"`\n\n @complexity The complexity depends on the type:\n - objects: amortized constant\n - arrays: linear in distance between @a pos and the end of the container\n - strings: linear in the length of the string\n - other types: constant\n\n @liveexample{The example shows the result of `erase()` for different JSON\n types.,erase__IteratorType}\n\n @sa @ref erase(IteratorType, IteratorType) -- removes the elements in\n the given range\n @sa @ref erase(const typename object_t::key_type&) -- removes the element\n from an object at the given key\n @sa @ref erase(const size_type) -- removes the element from an array at\n the given index\n\n @since version 1.0.0\n */\n template::value or\n std::is_same::value, int>::type\n = 0>\n IteratorType erase(IteratorType pos)\n {\n // make sure iterator fits the current value\n if (this != pos.m_object)\n {\n JSON_THROW(std::domain_error(\"iterator does not fit current value\"));\n }\n\n IteratorType result = end();\n\n switch (m_type)\n {\n case value_t::boolean:\n case value_t::number_float:\n case value_t::number_integer:\n case value_t::number_unsigned:\n case value_t::string:\n {\n if (not pos.m_it.primitive_iterator.is_begin())\n {\n JSON_THROW(std::out_of_range(\"iterator out of range\"));\n }\n\n if (is_string())\n {\n AllocatorType alloc;\n alloc.destroy(m_value.string);\n alloc.deallocate(m_value.string, 1);\n m_value.string = nullptr;\n }\n\n m_type = value_t::null;\n assert_invariant();\n break;\n }\n\n case value_t::object:\n {\n result.m_it.object_iterator = m_value.object->erase(pos.m_it.object_iterator);\n break;\n }\n\n case value_t::array:\n {\n result.m_it.array_iterator = m_value.array->erase(pos.m_it.array_iterator);\n break;\n }\n\n default:\n {\n JSON_THROW(std::domain_error(\"cannot use erase() with \" + type_name()));\n }\n }\n\n return result;\n }\n\n /*!\n @brief remove elements given an iterator range\n\n Removes the element specified by the range `[first; last)`. The iterator\n @a first does not need to be dereferenceable if `first == last`: erasing\n an empty range is a no-op.\n\n If called on a primitive type other than `null`, the resulting JSON value\n will be `null`.\n\n @param[in] first iterator to the beginning of the range to remove\n @param[in] last iterator past the end of the range to remove\n @return Iterator following the last removed element. If the iterator @a\n second refers to the last element, the `end()` iterator is returned.\n\n @tparam IteratorType an @ref iterator or @ref const_iterator\n\n @post Invalidates iterators and references at or after the point of the\n erase, including the `end()` iterator.\n\n @throw std::domain_error if called on a `null` value; example: `\"cannot\n use erase() with null\"`\n @throw std::domain_error if called on iterators which does not belong to\n the current JSON value; example: `\"iterators do not fit current value\"`\n @throw std::out_of_range if called on a primitive type with invalid\n iterators (i.e., if `first != begin()` and `last != end()`); example:\n `\"iterators out of range\"`\n\n @complexity The complexity depends on the type:\n - objects: `log(size()) + std::distance(first, last)`\n - arrays: linear in the distance between @a first and @a last, plus linear\n in the distance between @a last and end of the container\n - strings: linear in the length of the string\n - other types: constant\n\n @liveexample{The example shows the result of `erase()` for different JSON\n types.,erase__IteratorType_IteratorType}\n\n @sa @ref erase(IteratorType) -- removes the element at a given position\n @sa @ref erase(const typename object_t::key_type&) -- removes the element\n from an object at the given key\n @sa @ref erase(const size_type) -- removes the element from an array at\n the given index\n\n @since version 1.0.0\n */\n template::value or\n std::is_same::value, int>::type\n = 0>\n IteratorType erase(IteratorType first, IteratorType last)\n {\n // make sure iterator fits the current value\n if (this != first.m_object or this != last.m_object)\n {\n JSON_THROW(std::domain_error(\"iterators do not fit current value\"));\n }\n\n IteratorType result = end();\n\n switch (m_type)\n {\n case value_t::boolean:\n case value_t::number_float:\n case value_t::number_integer:\n case value_t::number_unsigned:\n case value_t::string:\n {\n if (not first.m_it.primitive_iterator.is_begin() or not last.m_it.primitive_iterator.is_end())\n {\n JSON_THROW(std::out_of_range(\"iterators out of range\"));\n }\n\n if (is_string())\n {\n AllocatorType alloc;\n alloc.destroy(m_value.string);\n alloc.deallocate(m_value.string, 1);\n m_value.string = nullptr;\n }\n\n m_type = value_t::null;\n assert_invariant();\n break;\n }\n\n case value_t::object:\n {\n result.m_it.object_iterator = m_value.object->erase(first.m_it.object_iterator,\n last.m_it.object_iterator);\n break;\n }\n\n case value_t::array:\n {\n result.m_it.array_iterator = m_value.array->erase(first.m_it.array_iterator,\n last.m_it.array_iterator);\n break;\n }\n\n default:\n {\n JSON_THROW(std::domain_error(\"cannot use erase() with \" + type_name()));\n }\n }\n\n return result;\n }\n\n /*!\n @brief remove element from a JSON object given a key\n\n Removes elements from a JSON object with the key value @a key.\n\n @param[in] key value of the elements to remove\n\n @return Number of elements removed. If @a ObjectType is the default\n `std::map` type, the return value will always be `0` (@a key was not\n found) or `1` (@a key was found).\n\n @post References and iterators to the erased elements are invalidated.\n Other references and iterators are not affected.\n\n @throw std::domain_error when called on a type other than JSON object;\n example: `\"cannot use erase() with null\"`\n\n @complexity `log(size()) + count(key)`\n\n @liveexample{The example shows the effect of `erase()`.,erase__key_type}\n\n @sa @ref erase(IteratorType) -- removes the element at a given position\n @sa @ref erase(IteratorType, IteratorType) -- removes the elements in\n the given range\n @sa @ref erase(const size_type) -- removes the element from an array at\n the given index\n\n @since version 1.0.0\n */\n size_type erase(const typename object_t::key_type& key)\n {\n // this erase only works for objects\n if (is_object())\n {\n return m_value.object->erase(key);\n }\n\n JSON_THROW(std::domain_error(\"cannot use erase() with \" + type_name()));\n }\n\n /*!\n @brief remove element from a JSON array given an index\n\n Removes element from a JSON array at the index @a idx.\n\n @param[in] idx index of the element to remove\n\n @throw std::domain_error when called on a type other than JSON array;\n example: `\"cannot use erase() with null\"`\n @throw std::out_of_range when `idx >= size()`; example: `\"array index 17\n is out of range\"`\n\n @complexity Linear in distance between @a idx and the end of the container.\n\n @liveexample{The example shows the effect of `erase()`.,erase__size_type}\n\n @sa @ref erase(IteratorType) -- removes the element at a given position\n @sa @ref erase(IteratorType, IteratorType) -- removes the elements in\n the given range\n @sa @ref erase(const typename object_t::key_type&) -- removes the element\n from an object at the given key\n\n @since version 1.0.0\n */\n void erase(const size_type idx)\n {\n // this erase only works for arrays\n if (is_array())\n {\n if (idx >= size())\n {\n JSON_THROW(std::out_of_range(\"array index \" + std::to_string(idx) + \" is out of range\"));\n }\n\n m_value.array->erase(m_value.array->begin() + static_cast(idx));\n }\n else\n {\n JSON_THROW(std::domain_error(\"cannot use erase() with \" + type_name()));\n }\n }\n\n /// @}\n\n\n ////////////\n // lookup //\n ////////////\n\n /// @name lookup\n /// @{\n\n /*!\n @brief find an element in a JSON object\n\n Finds an element in a JSON object with key equivalent to @a key. If the\n element is not found or the JSON value is not an object, end() is\n returned.\n\n @note This method always returns @ref end() when executed on a JSON type\n that is not an object.\n\n @param[in] key key value of the element to search for\n\n @return Iterator to an element with key equivalent to @a key. If no such\n element is found or the JSON value is not an object, past-the-end (see\n @ref end()) iterator is returned.\n\n @complexity Logarithmic in the size of the JSON object.\n\n @liveexample{The example shows how `find()` is used.,find__key_type}\n\n @since version 1.0.0\n */\n iterator find(typename object_t::key_type key)\n {\n auto result = end();\n\n if (is_object())\n {\n result.m_it.object_iterator = m_value.object->find(key);\n }\n\n return result;\n }\n\n /*!\n @brief find an element in a JSON object\n @copydoc find(typename object_t::key_type)\n */\n const_iterator find(typename object_t::key_type key) const\n {\n auto result = cend();\n\n if (is_object())\n {\n result.m_it.object_iterator = m_value.object->find(key);\n }\n\n return result;\n }\n\n /*!\n @brief returns the number of occurrences of a key in a JSON object\n\n Returns the number of elements with key @a key. If ObjectType is the\n default `std::map` type, the return value will always be `0` (@a key was\n not found) or `1` (@a key was found).\n\n @note This method always returns `0` when executed on a JSON type that is\n not an object.\n\n @param[in] key key value of the element to count\n\n @return Number of elements with key @a key. If the JSON value is not an\n object, the return value will be `0`.\n\n @complexity Logarithmic in the size of the JSON object.\n\n @liveexample{The example shows how `count()` is used.,count}\n\n @since version 1.0.0\n */\n size_type count(typename object_t::key_type key) const\n {\n // return 0 for all nonobject types\n return is_object() ? m_value.object->count(key) : 0;\n }\n\n /// @}\n\n\n ///////////////\n // iterators //\n ///////////////\n\n /// @name iterators\n /// @{\n\n /*!\n @brief returns an iterator to the first element\n\n Returns an iterator to the first element.\n\n @image html range-begin-end.svg \"Illustration from cppreference.com\"\n\n @return iterator to the first element\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n\n @liveexample{The following code shows an example for `begin()`.,begin}\n\n @sa @ref cbegin() -- returns a const iterator to the beginning\n @sa @ref end() -- returns an iterator to the end\n @sa @ref cend() -- returns a const iterator to the end\n\n @since version 1.0.0\n */\n iterator begin() noexcept\n {\n iterator result(this);\n result.set_begin();\n return result;\n }\n\n /*!\n @copydoc basic_json::cbegin()\n */\n const_iterator begin() const noexcept\n {\n return cbegin();\n }\n\n /*!\n @brief returns a const iterator to the first element\n\n Returns a const iterator to the first element.\n\n @image html range-begin-end.svg \"Illustration from cppreference.com\"\n\n @return const iterator to the first element\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n - Has the semantics of `const_cast(*this).begin()`.\n\n @liveexample{The following code shows an example for `cbegin()`.,cbegin}\n\n @sa @ref begin() -- returns an iterator to the beginning\n @sa @ref end() -- returns an iterator to the end\n @sa @ref cend() -- returns a const iterator to the end\n\n @since version 1.0.0\n */\n const_iterator cbegin() const noexcept\n {\n const_iterator result(this);\n result.set_begin();\n return result;\n }\n\n /*!\n @brief returns an iterator to one past the last element\n\n Returns an iterator to one past the last element.\n\n @image html range-begin-end.svg \"Illustration from cppreference.com\"\n\n @return iterator one past the last element\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n\n @liveexample{The following code shows an example for `end()`.,end}\n\n @sa @ref cend() -- returns a const iterator to the end\n @sa @ref begin() -- returns an iterator to the beginning\n @sa @ref cbegin() -- returns a const iterator to the beginning\n\n @since version 1.0.0\n */\n iterator end() noexcept\n {\n iterator result(this);\n result.set_end();\n return result;\n }\n\n /*!\n @copydoc basic_json::cend()\n */\n const_iterator end() const noexcept\n {\n return cend();\n }\n\n /*!\n @brief returns a const iterator to one past the last element\n\n Returns a const iterator to one past the last element.\n\n @image html range-begin-end.svg \"Illustration from cppreference.com\"\n\n @return const iterator one past the last element\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n - Has the semantics of `const_cast(*this).end()`.\n\n @liveexample{The following code shows an example for `cend()`.,cend}\n\n @sa @ref end() -- returns an iterator to the end\n @sa @ref begin() -- returns an iterator to the beginning\n @sa @ref cbegin() -- returns a const iterator to the beginning\n\n @since version 1.0.0\n */\n const_iterator cend() const noexcept\n {\n const_iterator result(this);\n result.set_end();\n return result;\n }\n\n /*!\n @brief returns an iterator to the reverse-beginning\n\n Returns an iterator to the reverse-beginning; that is, the last element.\n\n @image html range-rbegin-rend.svg \"Illustration from cppreference.com\"\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)\n requirements:\n - The complexity is constant.\n - Has the semantics of `reverse_iterator(end())`.\n\n @liveexample{The following code shows an example for `rbegin()`.,rbegin}\n\n @sa @ref crbegin() -- returns a const reverse iterator to the beginning\n @sa @ref rend() -- returns a reverse iterator to the end\n @sa @ref crend() -- returns a const reverse iterator to the end\n\n @since version 1.0.0\n */\n reverse_iterator rbegin() noexcept\n {\n return reverse_iterator(end());\n }\n\n /*!\n @copydoc basic_json::crbegin()\n */\n const_reverse_iterator rbegin() const noexcept\n {\n return crbegin();\n }\n\n /*!\n @brief returns an iterator to the reverse-end\n\n Returns an iterator to the reverse-end; that is, one before the first\n element.\n\n @image html range-rbegin-rend.svg \"Illustration from cppreference.com\"\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)\n requirements:\n - The complexity is constant.\n - Has the semantics of `reverse_iterator(begin())`.\n\n @liveexample{The following code shows an example for `rend()`.,rend}\n\n @sa @ref crend() -- returns a const reverse iterator to the end\n @sa @ref rbegin() -- returns a reverse iterator to the beginning\n @sa @ref crbegin() -- returns a const reverse iterator to the beginning\n\n @since version 1.0.0\n */\n reverse_iterator rend() noexcept\n {\n return reverse_iterator(begin());\n }\n\n /*!\n @copydoc basic_json::crend()\n */\n const_reverse_iterator rend() const noexcept\n {\n return crend();\n }\n\n /*!\n @brief returns a const reverse iterator to the last element\n\n Returns a const iterator to the reverse-beginning; that is, the last\n element.\n\n @image html range-rbegin-rend.svg \"Illustration from cppreference.com\"\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)\n requirements:\n - The complexity is constant.\n - Has the semantics of `const_cast(*this).rbegin()`.\n\n @liveexample{The following code shows an example for `crbegin()`.,crbegin}\n\n @sa @ref rbegin() -- returns a reverse iterator to the beginning\n @sa @ref rend() -- returns a reverse iterator to the end\n @sa @ref crend() -- returns a const reverse iterator to the end\n\n @since version 1.0.0\n */\n const_reverse_iterator crbegin() const noexcept\n {\n return const_reverse_iterator(cend());\n }\n\n /*!\n @brief returns a const reverse iterator to one before the first\n\n Returns a const reverse iterator to the reverse-end; that is, one before\n the first element.\n\n @image html range-rbegin-rend.svg \"Illustration from cppreference.com\"\n\n @complexity Constant.\n\n @requirement This function helps `basic_json` satisfying the\n [ReversibleContainer](http://en.cppreference.com/w/cpp/concept/ReversibleContainer)\n requirements:\n - The complexity is constant.\n - Has the semantics of `const_cast(*this).rend()`.\n\n @liveexample{The following code shows an example for `crend()`.,crend}\n\n @sa @ref rend() -- returns a reverse iterator to the end\n @sa @ref rbegin() -- returns a reverse iterator to the beginning\n @sa @ref crbegin() -- returns a const reverse iterator to the beginning\n\n @since version 1.0.0\n */\n const_reverse_iterator crend() const noexcept\n {\n return const_reverse_iterator(cbegin());\n }\n\n private:\n // forward declaration\n template class iteration_proxy;\n\n public:\n /*!\n @brief wrapper to access iterator member functions in range-based for\n\n This function allows to access @ref iterator::key() and @ref\n iterator::value() during range-based for loops. In these loops, a\n reference to the JSON values is returned, so there is no access to the\n underlying iterator.\n\n @note The name of this function is not yet final and may change in the\n future.\n */\n static iteration_proxy iterator_wrapper(reference cont)\n {\n return iteration_proxy(cont);\n }\n\n /*!\n @copydoc iterator_wrapper(reference)\n */\n static iteration_proxy iterator_wrapper(const_reference cont)\n {\n return iteration_proxy(cont);\n }\n\n /// @}\n\n\n //////////////\n // capacity //\n //////////////\n\n /// @name capacity\n /// @{\n\n /*!\n @brief checks whether the container is empty\n\n Checks if a JSON value has no elements.\n\n @return The return value depends on the different types and is\n defined as follows:\n Value type | return value\n ----------- | -------------\n null | `true`\n boolean | `false`\n string | `false`\n number | `false`\n object | result of function `object_t::empty()`\n array | result of function `array_t::empty()`\n\n @note This function does not return whether a string stored as JSON value\n is empty - it returns whether the JSON container itself is empty which is\n false in the case of a string.\n\n @complexity Constant, as long as @ref array_t and @ref object_t satisfy\n the Container concept; that is, their `empty()` functions have constant\n complexity.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n - Has the semantics of `begin() == end()`.\n\n @liveexample{The following code uses `empty()` to check if a JSON\n object contains any elements.,empty}\n\n @sa @ref size() -- returns the number of elements\n\n @since version 1.0.0\n */\n bool empty() const noexcept\n {\n switch (m_type)\n {\n case value_t::null:\n {\n // null values are empty\n return true;\n }\n\n case value_t::array:\n {\n // delegate call to array_t::empty()\n return m_value.array->empty();\n }\n\n case value_t::object:\n {\n // delegate call to object_t::empty()\n return m_value.object->empty();\n }\n\n default:\n {\n // all other types are nonempty\n return false;\n }\n }\n }\n\n /*!\n @brief returns the number of elements\n\n Returns the number of elements in a JSON value.\n\n @return The return value depends on the different types and is\n defined as follows:\n Value type | return value\n ----------- | -------------\n null | `0`\n boolean | `1`\n string | `1`\n number | `1`\n object | result of function object_t::size()\n array | result of function array_t::size()\n\n @note This function does not return the length of a string stored as JSON\n value - it returns the number of elements in the JSON value which is 1 in\n the case of a string.\n\n @complexity Constant, as long as @ref array_t and @ref object_t satisfy\n the Container concept; that is, their size() functions have constant\n complexity.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n - Has the semantics of `std::distance(begin(), end())`.\n\n @liveexample{The following code calls `size()` on the different value\n types.,size}\n\n @sa @ref empty() -- checks whether the container is empty\n @sa @ref max_size() -- returns the maximal number of elements\n\n @since version 1.0.0\n */\n size_type size() const noexcept\n {\n switch (m_type)\n {\n case value_t::null:\n {\n // null values are empty\n return 0;\n }\n\n case value_t::array:\n {\n // delegate call to array_t::size()\n return m_value.array->size();\n }\n\n case value_t::object:\n {\n // delegate call to object_t::size()\n return m_value.object->size();\n }\n\n default:\n {\n // all other types have size 1\n return 1;\n }\n }\n }\n\n /*!\n @brief returns the maximum possible number of elements\n\n Returns the maximum number of elements a JSON value is able to hold due to\n system or library implementation limitations, i.e. `std::distance(begin(),\n end())` for the JSON value.\n\n @return The return value depends on the different types and is\n defined as follows:\n Value type | return value\n ----------- | -------------\n null | `0` (same as `size()`)\n boolean | `1` (same as `size()`)\n string | `1` (same as `size()`)\n number | `1` (same as `size()`)\n object | result of function `object_t::max_size()`\n array | result of function `array_t::max_size()`\n\n @complexity Constant, as long as @ref array_t and @ref object_t satisfy\n the Container concept; that is, their `max_size()` functions have constant\n complexity.\n\n @requirement This function helps `basic_json` satisfying the\n [Container](http://en.cppreference.com/w/cpp/concept/Container)\n requirements:\n - The complexity is constant.\n - Has the semantics of returning `b.size()` where `b` is the largest\n possible JSON value.\n\n @liveexample{The following code calls `max_size()` on the different value\n types. Note the output is implementation specific.,max_size}\n\n @sa @ref size() -- returns the number of elements\n\n @since version 1.0.0\n */\n size_type max_size() const noexcept\n {\n switch (m_type)\n {\n case value_t::array:\n {\n // delegate call to array_t::max_size()\n return m_value.array->max_size();\n }\n\n case value_t::object:\n {\n // delegate call to object_t::max_size()\n return m_value.object->max_size();\n }\n\n default:\n {\n // all other types have max_size() == size()\n return size();\n }\n }\n }\n\n /// @}\n\n\n ///////////////\n // modifiers //\n ///////////////\n\n /// @name modifiers\n /// @{\n\n /*!\n @brief clears the contents\n\n Clears the content of a JSON value and resets it to the default value as\n if @ref basic_json(value_t) would have been called:\n\n Value type | initial value\n ----------- | -------------\n null | `null`\n boolean | `false`\n string | `\"\"`\n number | `0`\n object | `{}`\n array | `[]`\n\n @complexity Linear in the size of the JSON value.\n\n @liveexample{The example below shows the effect of `clear()` to different\n JSON types.,clear}\n\n @since version 1.0.0\n */\n void clear() noexcept\n {\n switch (m_type)\n {\n case value_t::number_integer:\n {\n m_value.number_integer = 0;\n break;\n }\n\n case value_t::number_unsigned:\n {\n m_value.number_unsigned = 0;\n break;\n }\n\n case value_t::number_float:\n {\n m_value.number_float = 0.0;\n break;\n }\n\n case value_t::boolean:\n {\n m_value.boolean = false;\n break;\n }\n\n case value_t::string:\n {\n m_value.string->clear();\n break;\n }\n\n case value_t::array:\n {\n m_value.array->clear();\n break;\n }\n\n case value_t::object:\n {\n m_value.object->clear();\n break;\n }\n\n default:\n {\n break;\n }\n }\n }\n\n /*!\n @brief add an object to an array\n\n Appends the given element @a val to the end of the JSON value. If the\n function is called on a JSON null value, an empty array is created before\n appending @a val.\n\n @param[in] val the value to add to the JSON array\n\n @throw std::domain_error when called on a type other than JSON array or\n null; example: `\"cannot use push_back() with number\"`\n\n @complexity Amortized constant.\n\n @liveexample{The example shows how `push_back()` and `+=` can be used to\n add elements to a JSON array. Note how the `null` value was silently\n converted to a JSON array.,push_back}\n\n @since version 1.0.0\n */\n void push_back(basic_json&& val)\n {\n // push_back only works for null objects or arrays\n if (not(is_null() or is_array()))\n {\n JSON_THROW(std::domain_error(\"cannot use push_back() with \" + type_name()));\n }\n\n // transform null object into an array\n if (is_null())\n {\n m_type = value_t::array;\n m_value = value_t::array;\n assert_invariant();\n }\n\n // add element to array (move semantics)\n m_value.array->push_back(std::move(val));\n // invalidate object\n val.m_type = value_t::null;\n }\n\n /*!\n @brief add an object to an array\n @copydoc push_back(basic_json&&)\n */\n reference operator+=(basic_json&& val)\n {\n push_back(std::move(val));\n return *this;\n }\n\n /*!\n @brief add an object to an array\n @copydoc push_back(basic_json&&)\n */\n void push_back(const basic_json& val)\n {\n // push_back only works for null objects or arrays\n if (not(is_null() or is_array()))\n {\n JSON_THROW(std::domain_error(\"cannot use push_back() with \" + type_name()));\n }\n\n // transform null object into an array\n if (is_null())\n {\n m_type = value_t::array;\n m_value = value_t::array;\n assert_invariant();\n }\n\n // add element to array\n m_value.array->push_back(val);\n }\n\n /*!\n @brief add an object to an array\n @copydoc push_back(basic_json&&)\n */\n reference operator+=(const basic_json& val)\n {\n push_back(val);\n return *this;\n }\n\n /*!\n @brief add an object to an object\n\n Inserts the given element @a val to the JSON object. If the function is\n called on a JSON null value, an empty object is created before inserting\n @a val.\n\n @param[in] val the value to add to the JSON object\n\n @throw std::domain_error when called on a type other than JSON object or\n null; example: `\"cannot use push_back() with number\"`\n\n @complexity Logarithmic in the size of the container, O(log(`size()`)).\n\n @liveexample{The example shows how `push_back()` and `+=` can be used to\n add elements to a JSON object. Note how the `null` value was silently\n converted to a JSON object.,push_back__object_t__value}\n\n @since version 1.0.0\n */\n void push_back(const typename object_t::value_type& val)\n {\n // push_back only works for null objects or objects\n if (not(is_null() or is_object()))\n {\n JSON_THROW(std::domain_error(\"cannot use push_back() with \" + type_name()));\n }\n\n // transform null object into an object\n if (is_null())\n {\n m_type = value_t::object;\n m_value = value_t::object;\n assert_invariant();\n }\n\n // add element to array\n m_value.object->insert(val);\n }\n\n /*!\n @brief add an object to an object\n @copydoc push_back(const typename object_t::value_type&)\n */\n reference operator+=(const typename object_t::value_type& val)\n {\n push_back(val);\n return *this;\n }\n\n /*!\n @brief add an object to an object\n\n This function allows to use `push_back` with an initializer list. In case\n\n 1. the current value is an object,\n 2. the initializer list @a init contains only two elements, and\n 3. the first element of @a init is a string,\n\n @a init is converted into an object element and added using\n @ref push_back(const typename object_t::value_type&). Otherwise, @a init\n is converted to a JSON value and added using @ref push_back(basic_json&&).\n\n @param init an initializer list\n\n @complexity Linear in the size of the initializer list @a init.\n\n @note This function is required to resolve an ambiguous overload error,\n because pairs like `{\"key\", \"value\"}` can be both interpreted as\n `object_t::value_type` or `std::initializer_list`, see\n https://github.com/nlohmann/json/issues/235 for more information.\n\n @liveexample{The example shows how initializer lists are treated as\n objects when possible.,push_back__initializer_list}\n */\n void push_back(std::initializer_list init)\n {\n if (is_object() and init.size() == 2 and init.begin()->is_string())\n {\n const string_t key = *init.begin();\n push_back(typename object_t::value_type(key, *(init.begin() + 1)));\n }\n else\n {\n push_back(basic_json(init));\n }\n }\n\n /*!\n @brief add an object to an object\n @copydoc push_back(std::initializer_list)\n */\n reference operator+=(std::initializer_list