std::basic_istream::putback
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<tbody> </tbody> basic_istream& putback( char_type ch ); |
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Inserisce il carattere
ch torna il flusso di input in modo che il carattere successivo estratto sarà 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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In primo luogo cancella
eofbit, quindi si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, se rdbuf() non è nullo, chiama rdbuf()->sputbackc(ch), che chiama rdbuf()->pbackfail(ch) ch se non è uguale al personaggio più recente estratto.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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Se
rdbuf() è null o se rdbuf->sputbackc(ch) ritorna Traits::eof(), chiama 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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In ogni caso, imposta il contatore a zero
gcount().Original:
In any case, sets the
gcount() counter to zero.The text has been machine-translated via Google Translate.
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Parametri
(Nessuno)
Original:
(none)
The text has been machine-translated via Google Translate.
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Valore di ritorno
*this
Esempio
illustra la differenza tra la modifica e non modifica putback ()
Original:
demonstrates the difference between modifying and non-modifying putback()
The text has been machine-translated via Google Translate.
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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
Vedi anche
unextracts un carattere 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. (metodo pubblico) | |
legge il carattere successivo senza estrarlo 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. (metodo pubblico) | |