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std::numeric_limits::is_iec559

STD::数字[医]限制::IS[医]IEC 559

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

Tvalue of std::numeric_limits::is_iec559
/* non-specialized */false
boolfalse
charfalse
signed charfalse
unsigned charfalse
wchar_tfalse
char16_tfalse
char32_tfalse
shortfalse
unsigned shortfalse
intfalse
unsigned intfalse
longfalse
unsigned longfalse
long longfalse
unsigned long longfalse
floatusually true
doubleusually true
long doubleusually true

另见

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

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