std::basic_istream::unget

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

std::basic_istream

Gli oggetti globali Original: Global objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

cin wcin

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istream::basic_istream

basic_istream::~basic_istream

basic_istream::operator= (C++11)

Ingresso formattato Original: Formatted input The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istream::operator>>

Ingresso non formattato Original: Unformatted input The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istream::tellg

basic_istream::seekg

Varie Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istream::sync

basic_istream::swap (C++11)

Membri classi Original: Member classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istream::sentry

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Parametri

(Nessuno)

Original:

(none)

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Valore di ritorno

*this

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

Vedi anche

get	estratti di caratteri Original: extracts characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
peek	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)
putback	mette carattere nel flusso di input Original: puts character into input stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)