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.
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 |
#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
|
[static] | returns the positive infinity value of the given floating-point type (public static member function) |
|
[static] | identifies floating-point types that can represent the special value "quiet not-a-number" (NaN) (public static member constant) |
|
[static] | identifies floating-point types that can represent the special value "signaling not-a-number" (NaN) (public static member constant) |
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https://en.cppreference.com/w/cpp/types/numeric_limits/has_infinity