std::numeric_limits<T>::has_denorm_loss

static const bool has_denorm_loss;		(until C++11)
static constexpr bool has_denorm_loss;		(since C++11) (deprecated in C++23)

The value of std::numeric_limits <T> :: has_denorm_loss is true for all floating-point types T

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
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	implementation-defined
double	implementation-defined
long double	implementation-defined

Notes

Standard-compliant IEEE 754 floating-point implementations of subnormal numbers are required to detect the loss of accuracy associated with the creation of such number, if it occurs, and may do so in one of the two distinct ways:

1. Denormalization loss: the delivered result differs from what would have been computed were exponent range unbounded.
2. Inexact result: the delivered result differs from what would have been computed were both exponent range and precision unbounded.

No implementation of denormalization loss mechanism exists (accuracy loss is detected after rounding, as inexact result), and this option was removed in the 2008 revision of IEEE Std 754.

libstdc++, libc++, libCstd, and stlport4 define this constant as false for all floating-point types. Microsoft Visual Studio defines it as true

As with any floating-point computations, accuracy loss may raise FE_INEXACT.

Example

This section is incomplete Reason: no example

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)