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std::numeric_limits::has_quiet_NaN

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

The value of std::numeric_limits<T>::has_quiet_NaN is true for all types T capable of representing the special value "Quiet Not-A-Number". This constant is meaningful for all floating-point types and is guaranteed to be true if std::numeric_limits<T>::is_iec559 == true.

Standard specializations

`T`	value of `std::numeric_limits<T>::has_quiet_NaN`
/* 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`

quiet_NaN [static]	returns a quiet NaN value of the given floating-point type (public static member function)
has_infinity [static]	identifies floating-point types that can represent the special value "positive infinity" (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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std::numeric_limits::has_quiet_NaN

Standard specializations

See also