std::numeric_limits::is_iec559

 

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std::numeric_limits

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numeric_limits::is_specialized

numeric_limits::is_signed

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numeric_limits::has_infinity

numeric_limits::has_quiet_NaN

numeric_limits::has_signaling_NaN

numeric_limits::has_denorm

numeric_limits::has_denorm_loss

numeric_limits::round_style

numeric_limits::is_iec559

numeric_limits::is_bounded

numeric_limits::is_modulo

numeric_limits::digits

numeric_limits::digits10

numeric_limits::max_digits10 (C++11)

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numeric_limits::min_exponent10

numeric_limits::max_exponent

numeric_limits::max_exponent10

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numeric_limits::tinyness_before

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numeric_limits::min

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numeric_limits::quiet_NaN

numeric_limits::signaling_NaN

numeric_limits::denorm_min

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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.

Standard specializations

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
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

See also

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