# std::numeric_limits::traps

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< cpp‎ | types‎ | numeric limits

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.

### 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

### 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`.

### 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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