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std::basic_filebuf::is_open

De cppreference.com
< cpp‎ | io‎ | basic filebuf

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::basic_filebuf
Fonctions membres publiques
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator= (C++11)
basic_filebuf::swap (C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Protégé fonctions membres
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Tiers fonctions
Original:
Non-member functions
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swap(std::basic_filebuf) (C++11)
 
bool is_open() const;
Retours true si l'appel le plus récent à open() réussi et il n'y a pas eu d'appel à close() depuis lors .
Original:
Returns true if the most recent call to open() succeeded and there has been no call to close() since then.
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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

true si le fichier associé est ouvert, false autrement .
Original:
true if the associated file is open, false otherwise.
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[modifier] Notes

Cette fonction est généralement appelée par std::basic_fstream::is_open .
Original:
This function is typically called by std::basic_fstream::is_open.
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[modifier] Exemple

#include <fstream>
#include <iostream>
 
int main()
{
    std::ifstream fs("test.txt");
    std::filebuf fb;
    fb.open("test.txt", std::ios_base::in);
    std::cout << std::boolalpha
              << "direct call: " << fb.is_open() << '\n'
              << "through streambuf: " << fs.rdbuf()->is_open() << '\n'
              << "through fstream: " << fs.is_open() << '\n';
}

Résultat :

direct call: true
through streambuf: true
through fstream: true

[modifier] Voir aussi

ouvre un fichier et le configure comme la séquence de caractères associé
Original:
opens a file and configures it as the associated character sequence
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(fonction membre publique) [edit]
le tampon des mises région et ferme le fichier associé
Original:
flushes the put area buffer and closes the associated file
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(fonction membre publique) [edit]