std::basic_istream::putback
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<metanoindex/>
<tbody> </tbody> basic_istream& putback( char_type ch ); |
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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. The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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).The text has been machine-translated via Google Translate.
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Dans tous les cas, fixe la
gcount() compteur à zéro .Original:
In any case, sets the
gcount() counter to zero.The text has been machine-translated via Google Translate.
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Paramètres
(Aucun)
Original:
(none)
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Retourne la valeur
*this
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
Voir aussi
unextracts un caractère Original: unextracts a character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
lit le caractère suivant sans l'extraire Original: reads the next character without extracting it The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |