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    std::basic_filebuf::is_open

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    <metanoindex/>

     
    C++
     
    Input / Output-Bibliothek
    I / O-Manipulatoren
    C-style I / O
    Puffern
    Original:
    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf(veraltet)
    Streams
    Original:
    Streams
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    Abstraktionen
    Original:
    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    Datei-I / O
    Original:
    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
    Original:
    Array I/O
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    istrstream(veraltet)
    ostrstream(veraltet)
    strstream(veraltet)
    Types
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    Types
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    streamoff
    streamsize
    fpos
    Fehler Kategorie Schnittstelle
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    Error category interface
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    iostream_category(C++11)
    io_errc(C++11)
     
    std::basic_filebuf
    Öffentliche Member-Funktionen
    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
    Geschützt Member-Funktionen
    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
    Non-Member-Funktionen
    Original:
    Non-member functions
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    swap(std::basic_filebuf)(C++11)
     
    <tbody> </tbody>
    bool is_open() const;
    Versandkosten true wenn der letzte Aufruf open() gelungen und es hat keine Veranlassung, close() seitdem .
    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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    Parameter

    (None)
    Original:
    (none)
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    Rückgabewert

    true, wenn die zugehörige Datei geöffnet ist, false sonst .
    Original:
    true if the associated file is open, false otherwise.
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    Notes

    Diese Funktion wird normalerweise durch std::basic_fstream::is_open genannt .
    Original:
    This function is typically called by std::basic_fstream::is_open.
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    Beispiel

    #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';
}

    Output: 

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

    Siehe auch
    öffnet eine Datei und konfiguriert es wie die zugehörige Zeichenfolge
    Original:
    opens a file and configures it as the associated character sequence
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    (öffentliche Elementfunktion) [edit]
    spült die Put-Bereich Puffer und schließt die zugehörige Datei
    Original:
    flushes the put area buffer and closes the associated file
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    (öffentliche Elementfunktion) [edit]