Namespace
Varianti

std::strerror

Da cppreference.com.
< cpp‎ | string‎ | byte

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
Null-stringhe terminate byte
Funzioni
Original:
Functions
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Carattere manipolazione
Original:
Character manipulation
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Le conversioni in formati numerici
Original:
Conversions to numeric formats
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Della gestione delle stringhe
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String esame
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String examination
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Memoria manipolazione
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varie
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Miscellaneous
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strerror
 
Defined in header <cstring>
char* strerror( int errnum );
versione testo Restituisce il codice di errore errnum. errnum di solito è acquisito dalla variabile errno, tuttavia la funzione accetta qualsiasi valore di int tipo. Il messaggio è specifica delle impostazioni locali.
Original:
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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La stringa di byte restituito non deve essere modificato dal programma, ma può essere sovrascritto da una chiamata successiva alla funzione strerror.
Original:
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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Indice

[modifica] Parametri

errnum -
valore integrale riferimento a un errore codice
Original:
integral value referring to a error code
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[modifica] Valore di ritorno

Puntatore a una stringa con terminazione null byte corrispondente al codice di errore errnum.
Original:
Pointer to a null-terminated byte string corresponding to the error code errnum.
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[modifica] Esempio

[edit]
#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';
    }
}

Output:

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

[modifica] Vedi anche

macro per standard POSIX compatibili con le condizioni di errore
Original:
macros for standard POSIX-compatible error conditions
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(macro costante) [edit]
C documentation for strerror