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std::perror

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De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C estilo de I / O
Funções
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Functions
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Arquivo de acesso
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File access
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Directa de entrada / saída
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Direct input/output
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fread
fwrite
Não formatado entrada / saída
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Unformatted input/output
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Formatado de entrada / saída
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Formatted input/output
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Arquivo de posicionamento
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File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
De tratamento de erros
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Error handling
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clearerr
feof
ferror
perror
Operações em arquivos
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
void perror( const char *s );
Impressões para stderr o conteúdo da cadeia de caracteres terminada em nulo apontado por s (a menos que s é um ponteiro nulo), seguido pelos dois personagens ": ", seguido pela implementação mensagem de erro definida descrevendo o código de erro atualmente armazenado na variável de sistema errno (idêntica à saída do std::strerror(errno)), seguido por '\n'.
Original:
Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of std::strerror(errno)), followed by '\n'.
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Índice

[editar] Parâmetros

s -
ponteiro para uma string terminada em nulo com mensagem explicativa
Original:
pointer to a null-terminated string with explanatory message
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[editar] Valor de retorno

(Nenhum)
Original:
(none)
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[editar] Exemplo

#include <cmath>
#include <cerrno>
#include <cstdio>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::perror("log(-1) failed");
    }
}

Output:

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

[editar] Veja também

macro que se expande para POSIX compatível variable
(variável macro) número de segmento local de erro
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macro which expands to POSIX-compatible thread-local error number variable
(variável macro)
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[edit]
retorna uma versão do texto de um código de erro apresentado
Original:
returns a text version of a given error code
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(função) [edit]
C documentation for perror