std::numeric_limits<T>::has_infinity

std::numeric_limits<T>::has_infinity - cppreference.com

From cppreference.com

`static const bool has_infinity;`		(until C++11)
`static constexpr bool has_infinity;`		(since C++11)

The value of std::numeric_limits<T>::has_infinity is true for all types T capable of representing the positive infinity as a distinct special value. This constant is meaningful for all floating-point types and is guaranteed to be true if std::numeric_limits<T>::is_iec559 == true.

Standard specializations

`T`	value of `std::numeric_limits<T>::has_infinity`
`/* non-specialized */`	`false`
`bool`	`false`
`char`	`false`
`signed char`	`false`
`unsigned char`	`false`
`wchar_t`	`false`
`char8_t` (since C++20)	`false`
`char16_t` (since C++11)	`false`
`char32_t` (since C++11)	`false`
`short`	`false`
`unsigned short`	`false`
`int`	`false`
`unsigned int`	`false`
`long`	`false`
`unsigned long`	`false`
`long long` (since C++11)	`false`
`unsigned long long` (since C++11)	`false`
`float`	usually `true`
`double`	usually `true`
`long double`	usually `true`

Example

#include <iostream>
#include <limits>

int main()
{
    std::cout << std::boolalpha
              << std::numeric_limits<int>::has_infinity << '\n'
              << std::numeric_limits<long>::has_infinity << '\n'
              << std::numeric_limits<float>::has_infinity << '\n'
              << std::numeric_limits<double>::has_infinity << '\n';
}

Possible output:

	returns the positive infinity value of the given floating-point type (public static member function) [edit]
	identifies floating-point types that can represent the special value "quiet not-a-number" (NaN) (public static member constant) [edit]
	identifies floating-point types that can represent the special value "signaling not-a-number" (NaN) (public static member constant) [edit]

Standard specializations

Example

See also