std::basic_istream::putback – cppreference.com
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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 The text has been machine-translated via Google Translate. (öffentliche Elementfunktion) [edit] | |
liest das nächste Zeichen ohne es zu extrahieren Original: reads the next character without extracting it The text has been machine-translated via Google Translate. (öffentliche Elementfunktion) [edit] | |