std::numeric_limits::traps - cppreference.com

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`static const bool traps`		(fino al c++11)

`static constexpr bool traps`		(dal C++11)

Il valore di std::numeric_limits<T>::traps è true per tutti i tipi aritmetici T che hanno almeno un valore che, se utilizzato come argomento per un'operazione aritmetica, genererà un trappola.

Original:

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 trappola.

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Specializzazioni standard


`T`	valore di `std::numeric_limits<T>::traps` Original: value of `std::numeric_limits<T>::traps` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

/* non-specialized */	`false`

`bool`	`false`

`char`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`signed char`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`unsigned char`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`wchar_t`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`char16_t`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`char32_t`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`short`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`unsigned short`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`int`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`unsigned int`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`long`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`unsigned long`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`long long`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`unsigned long long`	di solito `true` Original: usually `true` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`float`	di solito `false` Original: usually `false` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`double`	di solito `false` Original: usually `false` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`long double`	di solito `false` Original: usually `false` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Note

Sulla maggior parte delle piattaforme divisione intera per zero sempre trappole, e std::numeric_limits<T>::traps è true per tutti i tipi interi che supportano il valore 0. L'eccezione è il bool tipo: anche se la divisione per trappole false a causa di promozione integrale da bool a int, è il valore zero che int trappole. Zero non è un valore di tipo bool.

Original:

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.

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Sulla maggior parte delle piattaforme, eccezioni a virgola mobile può essere attivato e disattivato in fase di esecuzione (ad esempio, su Linux o feenableexcept() _controlfp su Windows), nel qual caso il valore di std::numeric_limits<T>::traps per tipi a virgola mobile riflette lo stato di virgola mobile impianto di cattura a il tempo di avvio del programma, che è false sulla maggior parte dei sistemi moderni. Un'eccezione potrebbe essere un programma DEC Alpha, dove è true se compilato senza -ieee.

Original:

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.

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Vedi anche


Virgola mobile ambiente

tinyness_before [statico]	identifica i tipi a virgola mobile che rilevano tinyness prima dell'arrotondamento Original: identifies floating-point types that detect tinyness before rounding The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (pubblico membro statico costante) [modifica]

has_denorm_loss [statico]	identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result (pubblico membro statico costante) [modifica]