std::numeric_limits<T>:: has_infinity

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

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';
}

false
false
true
true

See also