NAME¶

std::numeric_limits::has_quiet_NaN - std::numeric_limits::has_quiet_NaN

Synopsis¶

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
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

See also¶

quiet_NaN returns a quiet NaN value of the given floating-point type
[static] (public static member function)
has_infinity identifies floating-point types that can represent the special
[static] value "positive infinity"
(public static member constant)
has_signaling_NaN identifies floating-point types that can represent the special
[static] value "signaling not-a-number" (NaN)
(public static member constant)