std::basic_istream::putback
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<tbody> </tbody> basic_istream& putback( char_type ch ); |
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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. The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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).The text has been machine-translated via Google Translate.
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In jedem Fall setzt den Zähler auf Null
gcount() .Original:
In any case, sets the
gcount() counter to zero.The text has been machine-translated via Google Translate.
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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