NAME¶

std::numeric_limits::has_infinity - std::numeric_limits::has_infinity

Synopsis¶

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¶

// Run this code

#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:¶

false
false
true
true

See also¶

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