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~basic_json
| 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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
nlohmann::basic_json::basic_json | ( | const number_float_t | value | ) |
| inline
  Create a floating-point number JSON value with a given content. Parameters
  [in] | value | a floating-point value to create a JSON number from
  Note RFC 7159 http://www.rfc-editor.org/rfc/rfc7159.txt, 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 value 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 namespace nlohmann; 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::basic_json a class to store JSON values Definition: json.hpp:130 nlohmann namespace for Niels Lohmann Definition: json.hpp:55 nlohmann::basic_json::number_float_t NumberFloatType number_float_t a type for a number (floating-point) Definition: json.hpp:495 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