std::numeric_limits<T>::is_iec559

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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.

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 (C++20) false
char16_t (C++11) false
char32_t (C++11) false
short false
unsigned short false
int false
unsigned int false
long false
unsigned long false
long long (C++11) false
unsigned long long (C++11) false
float usually true
double usually true
long double usually true

See also

identifies floating-point types that can represent the special value "positive infinity"
(public static member constant)
identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
(public static member constant)
identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
(public static member constant)