Namespace
Varianti

std::perror

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C++
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
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Streams
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Astrazioni
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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
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
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fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C-style I / O
Funzioni
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Functions
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Accesso ai file
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File access
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Diretta input / output
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Direct input/output
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fread
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Ingresso formattato / uscita
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Unformatted input/output
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Formattato di input / output
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ftell
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La gestione degli errori
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Error handling
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clearerr
feof
ferror
perror
Le operazioni sui file
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Elemento definito nell'header <cstdio>
void perror( const char *s );
Stampe a stderr il contenuto della stringa con terminazione null di caratteri puntata da s (a meno che s è un puntatore nullo), seguito dai due caratteri ": ", seguiti dalla realizzazione messaggio di errore definito descrive il codice di errore attualmente memorizzato nella variabile di sistema errno (identica all'uscita di std::strerror(errno)), seguita da '\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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Indice

[modifica] Parametri

s -
puntatore ad una stringa con terminazione null con il messaggio esplicativo
Original:
pointer to a null-terminated string with explanatory message
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[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Esempio

#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

[modifica] Vedi anche
macro che si espande a POSIX thread locale variable
(variabili macro) Numero di errore
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macro which expands to POSIX-compatible thread-local error number variable
(variabili macro)
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[modifica]
restituisce una versione di testo di un codice di errore visualizzato
Original:
returns a text version of a given error code
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(funzione) [modifica]
C documentation for perror
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/c/perror&oldid=25789"