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std::feraiseexcept

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< cpp‎ | numeric‎ | fenv

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
De ponto flutuante ambiente
Funções
Original:
Functions
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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 de macros
Original:
Macro constants
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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 );
(a partir do C++ 11)
Tentativas de levantar todas as exceções de ponto flutuante listados na excepts (um bit a bit OU do flutuando macros de exceção de ponto). Se uma das exceções é FE_OVERFLOW ou FE_UNDERFLOW, esta função pode ainda aumentar FE_INEXACT. A ordem em que as exceções são levantadas é indeterminado, exceto que FE_OVERFLOW e FE_UNDERFLOW são sempre levantadas antes FE_INEXACT.
Original:
Attempts to raise all floating point exceptions listed in excepts (a bitwise OR of the flutuando macros de exceção de ponto). 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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Índice

[editar] Parâmetros

excepts -
bitmask listando as bandeiras de exceção para levantar
Original:
bitmask listing the exception flags to raise
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[editar] Valor de retorno

0 se todas as exceções listadas foram levantadas, valor não-zero, caso contrário.
Original:
0 if all listed exceptions were raised, non-zero value otherwise.
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[editar] Exemplo

#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

[editar] Veja também

limpa os especificados bandeiras de ponto flutuante de status
Original:
clears the specified floating-point status flags
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(função) [edit]
determina qual dos especificados bandeiras de ponto flutuante de estado são definidas
Original:
determines which of the specified floating-point status flags are set
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(função) [edit]