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std::numeric_limits::has_quiet_NaN

STD：：数字[医]限制：：[医]安静[医]南

static const bool has_quiet_NaN;​(until C++11)
static constexpr bool has_quiet_NaN;​(since C++11)

价值std::numeric_limits<T>::has_quiet_NaN是true适用于所有类型T能够代表特殊的值“静默”不-A-数字“.此常量对于所有浮点类型都有意义，并保证为true如果std::numeric_limits<T>::is_iec559==true...

标准专业化

Tvalue of std::numeric_limits::has_quiet_NaN
/* 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

quiet_NaN staticreturns a quiet NaN value of the given floating-point type (public static member function)
has_infinity staticidentifies floating-point types that can represent the special value "positive infinity" (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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