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std::perror

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< cpp‎ | io‎ | c

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
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Streams
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Abstractions
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
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Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
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Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
C-style I / O
Fonctions
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Functions
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Déposer accès
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File access
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Entrée / sortie directe
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Direct input/output
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fread
fwrite
Entrée non formatée / sortie
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Unformatted input/output
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Mise en forme d'entrée / sortie
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Formatted input/output
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Fichier de positionnement
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File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
Erreur de manipulation
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Error handling
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clearerr
feof
ferror
perror
Les opérations sur les fichiers
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
void perror( const char *s );
Affiche à stderr le contenu de la chaîne de caractères terminée par NULL pointé par s (sauf s est un pointeur nul), suivi par les deux personnages ": ", suivie de la mise en œuvre définie message d'erreur décrivant le code d'erreur actuellement stocké dans la variable système errno (identique à la sortie du std::strerror(errno)), suivie par '\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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Sommaire

[modifier] Paramètres

s -
pointeur vers une chaîne terminée par NULL avec un message explicatif
Original:
pointer to a null-terminated string with explanatory message
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[modifier] Retourne la valeur

(Aucun)
Original:
(none)
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[modifier] Exemple

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

Résultat :

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

[modifier] Voir aussi

macro qui se développe pour compatible POSIX thread local variable
(
variable de macro
Original:
macro variable
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)
numéro d'erreur
Original:
macro which expands to POSIX-compatible thread-local error number variable
(
variable de macro
Original:
macro variable
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)
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[edit]
renvoie une version texte d'un code d'erreur indiqué
Original:
returns a text version of a given error code
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(fonction) [edit]
C documentation for perror