# std::numeric_limits<T>::is_iec559

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< cpp‎ | types‎ | numeric limits

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 (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

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

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