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    std::basic_istream::putback

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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
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    Streams
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    Abstraktionen
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    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
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    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_istream
    Globale Objekte
    Original:
    Global objects
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    cin
    wcin
    Member-Funktionen
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    Member functions
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    basic_istream::basic_istream
    basic_istream::~basic_istream
    basic_istream::operator=(C++11)
    Formatierte Eingabe
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    Formatted input
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    basic_istream::operator>>
    Unformatierte Eingabe
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    Unformatted input
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    basic_istream::get
    basic_istream::peek
    basic_istream::unget
    basic_istream::putback
    basic_istream::getline
    basic_istream::ignore
    basic_istream::read
    basic_istream::readsome
    basic_istream::gcount
    Positionierung
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    Positioning
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    basic_istream::tellg
    basic_istream::seekg
    Verschiedenes
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    Miscellaneous
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    basic_istream::sync
    basic_istream::swap(C++11)
    Mitglied Klassen
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    Member classes
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    basic_istream::sentry
    Non-Member-Funktionen
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    Non-member functions
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    operator>>(std::basic_istream)
     
    <tbody> </tbody>
    basic_istream& putback( char_type ch );
    Versetzt den Charakter ch zurück zum Input-Stream, so dass die nächsten extrahiert Charakter ch sein wird .
    Original:
    Puts the character ch back to the input stream so the next extracted character will be ch.
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    Zuerst löscht eofbit verhält sich dann wie UnformattedInputFunction. Nach dem Bau und Prüfung der Schildwache Objekt, wenn rdbuf() nicht null ist, ruft rdbuf()->sputbackc(ch), die rdbuf()->pbackfail(ch) nennt, wenn ch nicht gleich die zuletzt extrahiert Charakter .
    Original:
    First clears eofbit, then behaves as UnformattedInputFunction. After constructing and checking the sentry object, if rdbuf() is not null, calls rdbuf()->sputbackc(ch), which calls rdbuf()->pbackfail(ch) if ch does not equal the most recently extracted character.
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    Wenn rdbuf() null ist oder wenn rdbuf->sputbackc(ch) kehrt Traits::eof(), ruft setstate(badbit) .
    Original:
    If rdbuf() is null or if rdbuf->sputbackc(ch) returns Traits::eof(), calls setstate(badbit).
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    In jedem Fall setzt den Zähler auf Null gcount() .
    Original:
    In any case, sets the gcount() counter to zero.
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    Parameter

    (None)
    Original:
    (none)
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    Rückgabewert

    *this

    Beispiel

    zeigt den Unterschied zwischen Modifizieren und nicht-modifizierende putback ()
    Original:
    demonstrates the difference between modifying and non-modifying putback()
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    #include <sstream>
#include <iostream>
int main()
{
    std::stringstream s1("Hello, world"); // IO stream
    s1.get();
    if(s1.putback('Y')) // modifies the buffer
        std::cout << s1.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";

    std::istringstream s2("Hello, world"); // input-only stream
    s2.get();
    if(s2.putback('Y')) // cannot modify input-only buffer
        std::cout << s2.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";

    s2.clear();
    if(s2.putback('H')) // non-modifying putback
        std::cout << s2.rdbuf() << '\n';
    else
        std::cout << "putback failed\n";
}

    Output: 

    Yello, world
putback failed
Hello, world

    Siehe auch
    unextracts ein Zeichen
    Original:
    unextracts a character
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    (öffentliche Elementfunktion) [edit]
    liest das nächste Zeichen ohne es zu extrahieren
    Original:
    reads the next character without extracting it
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    (öffentliche Elementfunktion) [edit]