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std::basic_istream::putback

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< cpp‎ | io‎ | basic istream

 
 
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)
 
std::basic_istream
Les objets globaux
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Global objects
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cin
wcin
Les fonctions membres
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator= (C++11)
Entrée formaté
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Formatted input
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basic_istream::operator>>
Entrée non formaté
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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
Positionnement
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Positioning
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basic_istream::tellg
basic_istream::seekg
Divers
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Miscellaneous
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basic_istream::sync
basic_istream::swap (C++11)
Classes de membres
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Member classes
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basic_istream::sentry
Tiers fonctions
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Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& putback( char_type ch );
Met le caractère ch dans le flux d'entrée de sorte que le caractère suivant extrait sera ch .
Original:
Puts the character ch back to the input stream so the next extracted character will be ch.
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Première efface eofbit, puis se comporte comme UnformattedInputFunction. Après la construction et la vérification de l'objet sentinelle, si rdbuf() n'est pas nulle, appelle rdbuf()->sputbackc(ch), qui appelle rdbuf()->pbackfail(ch) si ch n'égale pas le personnage le plus récemment extraite .
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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Si rdbuf() est nul ou si rdbuf->sputbackc(ch) retours Traits::eof(), appelle setstate(badbit) .
Original:
If rdbuf() is null or if rdbuf->sputbackc(ch) returns Traits::eof(), calls setstate(badbit).
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Dans tous les cas, fixe la gcount() compteur à zéro .
Original:
In any case, sets the gcount() counter to zero.
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Sommaire

[modifier] Paramètres

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

*this

[modifier] Exemple

montre la différence entre la modification et non-modification 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";
}

Résultat :

Yello, world
putback failed
Hello, world

[modifier] Voir aussi

unextracts un caractère
Original:
unextracts a character
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(fonction membre publique) [edit]
lit le caractère suivant sans l'extraire
Original:
reads the next character without extracting it
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(fonction membre publique) [edit]