std::feraiseexcept

 

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Genéricos operaciones numéricas Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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Floating-point medio ambiente

Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

feclearexcept (C++11)

fetestexcept (C++11)

feraiseexcept (C++11)

fegetexceptflag fesetexceptflag (C++11) (C++11)

fegetround fesetround (C++11) (C++11)

fegetenv fesetenv (C++11)

feholdexcept (C++11)

feupdateenv (C++11)

Constantes Macro Original: Macro constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

FE_ALL_EXCEPT FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW (C++11)

FE_DOWNWARD FE_TONEAREST FE_TOWARDZERO FE_UPWARD (C++11)

FE_DFL_ENV (C++11)

 

Defined in header <cfenv>
int feraiseexcept( int excepts );		(ya que C + +11)

Los intentos de elevar todas las excepciones de punto flotante que figuran en excepts (un OR de la flotando macros punto de excepción). Si una de las excepciones es FE_OVERFLOW o FE_UNDERFLOW, esta función puede además FE_INEXACT aumento. El orden en que las excepciones se plantean es indeterminada, salvo que FE_OVERFLOW y FE_UNDERFLOW siempre se planteó ante FE_INEXACT .

Original:

Attempts to raise all floating point exceptions listed in excepts (a bitwise OR of the flotando macros punto de excepción). If one of the exceptions is FE_OVERFLOW or FE_UNDERFLOW, this function may additionally raise FE_INEXACT. The order in which the exceptions are raised is unspecified, except that FE_OVERFLOW and FE_UNDERFLOW are always raised before FE_INEXACT.

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Parámetros

excepts

-

máscara de bits que enumeran las banderas de excepción plantear Original: bitmask listing the exception flags to raise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

​0​ si todas las excepciones enumeradas se plantearon valor distinto de cero de otra manera .

Original:

​0​ if all listed exceptions were raised, non-zero value otherwise.

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Ejemplo

#include <iostream>
#include <cfenv>
 
#pragma STDC FENV_ACCESS ON
 
int main()
{
    std::feclearexcept(FE_ALL_EXCEPT);
    int r = std::feraiseexcept(FE_UNDERFLOW | FE_DIVBYZERO);
    std::cout <<  "Raising divbyzero and underflow simultaneously "
              << (r?"fails":"succeeds") << " and results in\n";
    int e = std::fetestexcept(FE_ALL_EXCEPT);
    if (e & FE_DIVBYZERO) {
        std::cout << "division by zero\n";
    }
    if (e & FE_INEXACT) {
        std::cout << "inexact\n";
    }
    if (e & FE_INVALID) {
        std::cout << "invalid\n";
    }
    if (e & FE_UNDERFLOW) {
        std::cout << "underflow\n";
    }
    if (e & FE_OVERFLOW) {
        std::cout << "overflow\n";
    }
}

Output:

Raising divbyzero and underflow simultaneously succeeds and results in
division by zero
underflow

Ver también

feclearexcept (C++11)	borra los especificados en coma flotante indicadores de estado Original: clears the specified floating-point status flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
fetestexcept (C++11)	determina cuál de los indicadores de estado de punto flotante especificado se establecen Original: determines which of the specified floating-point status flags are set The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)