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std::basic_istream::unget

Da cppreference.com.
< cpp‎ | io‎ | basic istream

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Gli oggetti globali
Original:
Global objects
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cin
wcin
Membri funzioni
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Ingresso formattato
Original:
Formatted input
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basic_istream::operator>>
Ingresso non formattato
Original:
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
Posizionamento
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Varie
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Membri classi
Original:
Member classes
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basic_istream::sentry
Non membri funzioni
Original:
Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& unget();
Rende il personaggio più recente estratto nuovamente disponibile.
Original:
Makes the most recently extracted character available again.
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In primo luogo cancella eofbit, quindi si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, chiama rdbuf()->sungetc().
Original:
First clears eofbit, then behaves as UnformattedInputFunction. After constructing and checking the sentry object, calls rdbuf()->sungetc().
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Se rdbuf()->sungetc() restituisce Traits::eof(), chiama setstate(badbit).
Original:
If rdbuf()->sungetc() returns Traits::eof(), calls setstate(badbit).
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In ogni caso, imposta il contatore a zero gcount().
Original:
In any case, sets the gcount() counter to zero.
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

*this

[modifica] Esempio

#include <sstream>
#include <iostream>
int main()
{
    std::istringstream s1("Hello, world.");
    char c1 = s1.get();
    if(s1.unget())
    {
        char c2 = s1.get();
        std::cout << "Got: " << c1 << " got again: " << c2 << '\n';
    }
}

Output:

Got: H got again: H

[modifica] Vedi anche

estratti di caratteri
Original:
extracts characters
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(membro pubblico funzione) [edit]
legge il carattere successivo senza estrarlo
Original:
reads the next character without extracting it
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(membro pubblico funzione) [edit]
mette carattere nel flusso di input
Original:
puts character into input stream
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(membro pubblico funzione) [edit]