static const bool is_iec559;
(until C++11)static constexpr bool is_iec559;
(since C++11)The value of std::numeric_limits<T>::is_iec559 is true for all floating-point types T which fulfill the requirements of IEC 559 (IEEE 754) standard. If std::numeric_limits<T>::is_iec559 is true, then std::numeric_limits<T>::has_infinity, std::numeric_limits<T>::has_quiet_NaN, and std::numeric_limits<T>::has_signaling_NaN are also true.
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 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 identifies floating-point types that can represent the special value "positive infinity"
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