std::numeric_limits::traps

From cppreference.com


static const bool traps		(until C++11)

static constexpr bool traps		(since C++11)

The value of std::numeric_limits<T>::traps is true for all arithmetic types T that have at least one value that, if used as an argument to an arithmetic operation, will generate a trap.

[edit] Standard specializations


`T`	value of std::numeric_limits<T>::traps

/* non-specialized */	false

bool	false

char	usually true

signed char	usually true

unsigned char	usually true

wchar_t	usually true

char16_t	usually true

char32_t	usually true

short	usually true

unsigned short	usually true

int	usually true

unsigned int	usually true

long	usually true

unsigned long	usually true

long long	usually true

unsigned long long	usually true

float	usually false

double	usually false

long double	usually false

[edit] Notes

On most platforms integer division by zero always traps, and std::numeric_limits<T>::traps is true for all integer types that support the value 0. The exception is the type bool: even though division by false traps due to integral promotion from bool to int, it is the zero-valued int that traps. Zero is not a value of type bool.

On most platforms, floating-point exceptions may be turned on and off at run time (e.g. feenableexcept() on Linux or _controlfp on Windows), in which case the value of std::numeric_limits<T>::traps for floating-point types reflects the state of floating-point trapping facility at the time of program startup, which is false on most modern systems. An exception would be a DEC Alpha program, where it is true if compiled without -ieee.

[edit] See also


Floating-point environment

tinyness_before [static]	identifies floating-point types that detect tinyness before rounding (public static member constant)

has_denorm_loss [static]	identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result (public static member constant)

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