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std::strerror

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< cpp‎ | string‎ | byte

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C++
 
Biblioteca cordas
Strings terminadas
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Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
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Classes
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Cordas de terminação nula de bytes
Funções
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Functions
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Manipulação personagem
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Character manipulation
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Conversões para formatos numéricos
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Conversions to numeric formats
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Manipulação de cadeia
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String manipulation
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String examination
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Memory manipulation
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Diversos
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Miscellaneous
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strerror
 
Definido no cabeçalho <cstring>
char* strerror( int errnum );
Retorna a versão texto do código de erro errnum. errnum é geralmente adquirida a partir da variável errno, no entanto a função aceita qualquer valor de int tipo. A mensagem é específica para cada caso.
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Returns text version of the error code errnum. errnum is usually acquired from the errno variable, however the function accepts any value of type int. The message is locale-specific.
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A seqüência de byte retornado não deve ser modificado pelo programa, mas pode ser substituído por uma chamada subseqüente para a função strerror.
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The returned byte string must not be modified by the program, but may be overwritten by a subsequent call to the strerror function.
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Índice

[editar] Parâmetros

errnum -
valor. integrante referindo-se a um erro de código
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integral value referring to a error code
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[editar] Valor de retorno

Pointer. a um byte string terminada em nulo correspondente ao código de erro errnum.
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Pointer to a null-terminated byte string corresponding to the error code errnum.
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[editar] Exemplo

#include <iostream>
#include <cmath>
#include <cerrno>
#include <cstring>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::cout << "log(-1) failed: " << std::strerror(errno) << '\n';
    }
}

Saída: 

log(-1) failed: Numerical argument out of domain

[editar] Veja também
macros para condições normais POSIX-compatíveis erro
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macros for standard POSIX-compatible error conditions
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(macro constante) [edit]
Documentação C para strerror
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