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std::numeric_limits::traps

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std::numeric_limits
 
static const bool traps
(até C + 11)
static constexpr bool traps
(a partir do C++ 11)
O valor de std::numeric_limits<T>::traps é true para todos os tipos aritméticos T que têm pelo menos um valor que, se for utilizado como um argumento para uma operação aritmética, irá gerar uma armadilha.
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 armadilha.
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[editar] Especializações padrão

T
valor de std::numeric_limits<T>::traps
Original:
value of std::numeric_limits<T>::traps
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/* non-specialized */ false
bool false
char
geralmente true
Original:
usually true
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signed char
geralmente true
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usually true
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unsigned char
geralmente true
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usually true
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wchar_t
geralmente true
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usually true
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char16_t
geralmente true
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usually true
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char32_t
geralmente true
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usually true
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short
geralmente true
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usually true
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unsigned short
geralmente true
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usually true
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int
geralmente true
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usually true
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unsigned int
geralmente true
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usually true
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long
geralmente true
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usually true
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unsigned long
geralmente true
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usually true
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long long
geralmente true
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usually true
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unsigned long long
geralmente true
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usually true
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float
geralmente false
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usually false
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double
geralmente false
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usually false
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long double
geralmente false
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usually false
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[editar] Notas

Na maioria das plataformas divisão por zero sempre armadilhas, e std::numeric_limits<T>::traps é true para todos os tipos inteiros que suportam o valor 0. A exceção é o bool tipo: embora a divisão por armadilhas false devido a promoção integral da bool para int, são as armadilhas zero-valorizado que int. Zero não é um valor de bool tipo.
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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Na maioria das plataformas, exceções de ponto flutuante pode ser ligado e desligado em tempo de execução (por exemplo feenableexcept() no Linux ou _controlfp no Windows), caso em que o valor de std::numeric_limits<T>::traps para tipos de ponto flutuante reflete o estado de ponto flutuante de instalação em armadilhas o tempo de inicialização do programa, que é false na maioria dos sistemas modernos. Uma excepção seria um DEC Alpha programa, onde é true se compilado sem -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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[editar] Veja também

De ponto flutuante ambiente
[estática]
identifica tipos de ponto flutuante que detectam tinyness antes de arredondamentos
Original:
identifies floating-point types that detect tinyness before rounding
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(membro estático público constante) [edit]
[estática]
identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
(membro estático público constante) [edit]