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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../types/numeric_limits/has_quiet_NaN.html below:

std::numeric_limits<T>::has_quiet_NaN - cppreference.com

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.

[edit] 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 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 [edit] See also returns a quiet NaN value of the given floating-point type
(public static member function) [edit] identifies floating-point types that can represent the special value "positive infinity"
(public static member constant) [edit] identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
(public static member constant) [edit]

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