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    std::basic_filebuf::is_open

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    <metanoindex/>

     
    C++
     
    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)
     
    <tbody> </tbody>
    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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    Paramètres

    (Aucun)
    Original:
    (none)
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    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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    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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    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

    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]