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
.
Standard specializations
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 |
char16_t | false |
char32_t | false |
short | false |
unsigned short | false |
int | false |
unsigned int | false |
long | false |
unsigned long | false |
long long | false |
unsigned long long | false |
float | usually true |
double | usually true |
long double | usually true |
See also
[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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