JSON for Modern C++ 2.0.10

allocator_type
array
array_t
at
at
at
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back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
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basic_json
basic_json
basic_json
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basic_json
begin
begin
boolean_t
cbegin
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clear
const_iterator
const_pointer
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diff
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dump
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end
end
erase
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find
find
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front
front
get
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insert
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is_object
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is_string
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iterator
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max_size
number_float_t
number_integer_t
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operator value_t
operator ValueType
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reference
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~basic_json
| ## § basic_json() [16/23] template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
nlohmann::basic_json::basic_json | ( | const number_float_t | val | ) |
| inline noexcept
  Create a floating-point number JSON value with a given content. Parameters
  [in] | val | a floating-point value to create a JSON number from
  Note RFC 7159, section 6 disallows NaN values: Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted. In case the parameter val is not a number, a JSON null value is created instead. Complexity Constant. Example The following example creates several floating-point values. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create values of different floating-point types 8 json::number_float_t v_ok = 3.141592653589793; 9 json::number_float_t v_nan = NAN; 10 json::number_float_t v_infinity = INFINITY; 11 12 // create JSON numbers 13 json j_ok(v_ok); 14 json j_nan(v_nan); 15 json j_infinity(v_infinity); 16 17 // serialize the JSON numbers 18 std::cout << j_ok << '\n'; 19 std::cout << j_nan << '\n'; 20 std::cout << j_infinity << '\n'; 21 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:12151 nlohmann::basic_json::number_float_t NumberFloatType number_float_t a type for a number (floating-point) Definition: json.hpp:719 Output (play with this example online):
      3.14159265358979
      null
      null
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/basic_json__number_float_t.cpp -o basic_json__number_float_t
See also basic_json(const CompatibleNumberFloatType) – create a number value (floating-point) from a compatible number type Since version 1.0.0 Definition at line 1518 of file json.hpp.