std::numeric_limits::is_iec559 - cppreference.com (original) (raw)
| static const bool is_iec559; | | (until C++11) | | --------------------------------- | | ------------- | | static constexpr bool is_iec559; | | (since C++11) |
The value of std::numeric_limits<T>::is_iec559 is true for all floating-point types T which fulfill the requirements of IEC 559 (IEEE 754) standard. If std::numeric_limits<T>::is_iec559 is true, then std::numeric_limits<T>::has_infinity, std::numeric_limits<T>::has_quiet_NaN, and std::numeric_limits<T>::has_signaling_NaN are also true.
[edit] Standard specializations
| T | value of std::numeric_limits<T>::is_iec559 |
|---|---|
| /* 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 |
[edit] See also
| | identifies floating-point types that can represent the special value "positive infinity" (public static member constant) [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] |