NAME¶

std::numeric_limits::is_iec559 - std::numeric_limits::is_iec559

Synopsis¶

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¶

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