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>
template<typename CompatibleNumberFloatType , typename = typename std::enable_if< std::is_constructible<number_float_t, CompatibleNumberFloatType>::value and std::is_floating_point<CompatibleNumberFloatType>::value>::type>
Create an floating-point number JSON value with a given content. This constructor allows any type that can be used to construct values of type number_float_t. Examples may include the types float
.
- Template Parameters
-
CompatibleNumberFloatType | a floating-point type which is compatible to number_float_t. |
- Parameters
-
[in] | value | a floating-point 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 example below shows the construction of several JSON floating-point number values from compatible types.
9 float f_nan = 1.0f / 0.0f;
18 std::cout << j42 <<
'\n';
19 std::cout << j_nan <<
'\n';
20 std::cout << j23 <<
'\n';
a class to store JSON values
namespace for Niels Lohmann
Output (play with this example online): 42.2299995422363
null
23.42
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/basic_json__CompatibleNumberFloatType.cpp -o basic_json__CompatibleNumberFloatType
- See also
- basic_json(const number_float_t) – create a number value (floating-point)
- Since
- version 1.0
Definition at line 1304 of file json.hpp.