std::numeric_limits::has_denorm_loss

 

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static const bool has_denorm_loss		(until C++11)
static constexpr bool has_denorm_loss		(since C++11)

The value of std::numeric_limits<T>::has_denorm_loss is true for all floating-point types T capable of distinguishing loss of precision due to denormalization from other causes of inexact result.

Standard specializations

T	value of std::numeric_limits<T>::has_denorm_loss
/* 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	implementation-defined
double	implementation-defined
long double	implementation-defined

Notes

Standard-compliant IEE 754 floating-point implementations may detect the floating-point underflow at three predefined moments:

1) after computation of a result with absolute value smaller than std::numeric_limits<T>::min(), such implementation detects tinyness before rounding.

2) after rounding of the result to std::numeric_limits<T>::digits bits, if the result is tiny, such implementation detects tinyness after rounding.

3) if the conversion of the rounded tiny result to subnormal form resulted in the loss of precision, such implementation detects denorm loss.

See also

tinyness_before [static]	identifies floating-point types that detect tinyness before rounding (public static member constant)
has_denorm [static]	identifies the denormalization style used by the floating-point type (public static member constant)