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operator>><div class="t-tr-text">(Std :: basic_istream)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_istream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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)
 
template< class CharT, class Traits >

basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT& ch );

template< class Traits >
basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char& ch );

template< class Traits >

basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char& ch );
(1)
template< class CharT, class Traits>

basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT* s );

template< class Traits >
basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char* s );

template< class Traits >

basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char* s );
(2)
template< class CharT, class Traits, class T >
basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>&& st, T& value );
(3) (dal C++11)
Esegue operazioni di input dei caratteri.
Original:
Performs character input operations.
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1)
Estrae un carattere e lo memorizza per ch.
Original:
Extracts a character and stores it to ch.
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2)
Estrae i caratteri successivi e li memorizza in posizioni successive di un array di caratteri il cui primo elemento è puntato da s. L'estrazione si interrompe se una delle seguenti condizioni:
Original:
Extracts successive characters and stores them at successive locations of a character array whose first element is pointed to by s. The extraction stops if one of the following conditions are met:
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  • uno spazio bianco (come determinato dalla sfaccettatura ctype<CharT>) si trova. Il carattere di spazio non viene estratto.
    Original:
    a whitespace character (as determined by the ctype<CharT> facet) is found. The whitespace character is not extracted.
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  • Caratteri this->width() - 1 sono estratti
    Original:
    this->width() - 1 characters are extracted
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In entrambi i casi, un ulteriore carattere nullo CharT() valore viene memorizzato al termine dell'uscita.
Original:
In either case, an additional null character value CharT() is stored at the end of the output.
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3)
Chiama l'operatore di estrazione appropriato, dato un riferimento a un oggetto rvalue flusso di input (equivalente a st >> value).
Original:
Calls the appropriate extraction operator, given an rvalue reference to an input stream object (equivalent to st >> value).
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Indice

[modifica] Note

I (1-2) versioni del gestore si comportano come funzioni di ingresso in formato. Cioè, costruire un oggetto sentry all'inizio che svuota il legame () 'd buffer, se necessario, i controlli per gli errori, e gli estratti ed elimina tutti i caratteri di spazi bianchi a meno che il ios_base :: bandiera skipws è stato cancellato. L'ingresso è utilizzato solo se l'oggetto sentry restituisce true.
Original:
The (1-2) versions of the operator behave as formatted input functions. That is, they construct a sentry object at the beginning that flushes the tie()'d buffers if needed, checks for errors, and extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared. The input is attempted only if the sentry object returns true.
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[modifica] Parametri

st -
flusso di input per estrarre i dati da
Original:
input stream to extract the data from
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ch -
riferimento a un carattere per memorizzare il carattere estratto
Original:
reference to a character to store the extracted character to
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s -
puntatore a una stringa di caratteri per memorizzare i caratteri estratti
Original:
pointer to a character string to store the extracted characters to
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[modifica] Valore di ritorno

st

[modifica] Esempio

#include <iostream>
#include <iomanip>
#include <sstream>
 
int main()
{
    std::string input = "n greetings";
    std::istringstream stream(input);
    char c;
    const int MAX = 6;
    char cstr[MAX];
 
    stream >> c >> std::setw(MAX) >> cstr;
    std::cout << "c = " << c << '\n'
              << "cstr = " << cstr << '\n';
 
    double f;
    std::istringstream("1.23") >> f; // rvalue stream extraction
    std::cout << "f = " << f << '\n';
}

Output:

c = n
cstr = greet
f = 1.23

[modifica] Vedi anche

estratti i dati formattati
Original:
extracts formatted data
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(membro pubblico funzione) [edit]