static const bool has_quiet_NaN; | (until C++11) | |
static constexpr bool has_quiet_NaN; | (since C++11) |
The value of std::numeric_limits<T>::has_quiet_NaN is true for all types T capable of representing the special value "Quiet Not-A-Number". 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_quiet_NaN |
|---|---|
| /* 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 |
|
[static] | returns a quiet NaN value of the given floating-point type (public static member function) |
|
[static] | identifies floating-point types that can represent the special value "positive infinity" (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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