std::numeric_limits::is_iec559
static const bool is_iec559; | | (until C++11) |
|---|---|---|
static constexpr bool is_iec559; | | (since C++11) |
价值std::numeric_limits<T>::is_iec559是true适用于所有浮点类型。T符合iec 559%28的要求。IEEE 754%29标准。如果std::numeric_limits<T>::is_iec559是true，然后std::numeric_limits<T>::has_infinity，，，std::numeric_limits<T>::has_quiet_NaN，和std::numeric_limits<T>::has_signaling_NaN也是true...
标准专业化
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 |
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 |
另见
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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