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std::basic_istream::seekg

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< 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& seekg( pos_type pos );
basic_istream& seekg( off_type off, std::ios_base::seekdir dir);
Imposta la posizione di immissione della corrente dell'oggetto streambuf associato. In caso di guasto, chiama setstate(std::ios_base::failbit).
Original:
Sets input position indicator of the current associated streambuf object. In case of failure, calls setstate(std::ios_base::failbit).
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Primo, cancella eofbit(dal C++11), quindi si comporta come UnformattedInputFunction, tranne che gcount() non è interessato. Dopo la costruzione e la verifica dell'oggetto sentinella,
Original:
First, clears eofbit(dal C++11), then behaves as UnformattedInputFunction, except that gcount() is not affected. After constructing and checking the sentry object,
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1)
imposta l'indicatore di posizione di ingresso pos valore assoluto (relativo all'inizio del file). In particolare, esegue rdbuf()->pubseekpos(pos, std::ios_base::in).
Original:
sets the input position indicator to absolute (relative to the beginning of the file) value pos. Specifically, executes rdbuf()->pubseekpos(pos, std::ios_base::in).
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2)
imposta l'indicatore di posizione di ingresso off posizione, rispetto alla posizione, definita da dir. In particolare, esegue rdbuf()->pubseekoff(off, dir, std::ios_base::in).
Original:
sets the input position indicator to position off, relative to position, defined by dir. Specifically, executes rdbuf()->pubseekoff(off, dir, std::ios_base::in).
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Indice

[modifica] Parametri

pos -
posizione assoluta per impostare l'indicatore di posizione di ingresso .
Original:
absolute position to set the input position indicator to.
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off -
posizione relativa per impostare l'indicatore di posizione di ingresso .
Original:
relative position to set the input position indicator to.
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dir -
definisce la posizione di base per applicare l'offset rispetto. Essa può essere una delle seguenti costanti:
Constant
Original:
Constant
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Explanation
beg
l'inizio di un flusso
Original:
the beginning of a stream
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end
la fine di un corso d'acqua
Original:
the ending of a stream
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cur
la posizione corrente del flusso di indicatore di posizione
Original:
the current position of stream position indicator
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Original:
defines base position to apply the relative offset to. It can be one of the following constants:
Constant
Original:
Constant
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Explanation
beg
l'inizio di un flusso
Original:
the beginning of a stream
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end
la fine di un corso d'acqua
Original:
the ending of a stream
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cur
la posizione corrente del flusso di indicatore di posizione
Original:
the current position of stream position indicator
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[modifica] Valore di ritorno

*this

[modifica] Esempio

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    std::string str = "Hello, world";
    std::istringstream in(str);
    std::string word1, word2;
    in >> word1;
    in.seekg(0); // rewind
    in >> word2;
    std::cout << "word1 = " << word1 << '\n'
              << "word2 = " << word2 << '\n';
}

Output:

word1 = Hello,
word2 = Hello,

[modifica] Vedi anche

restituisce l'indicatore di posizione di ingresso
Original:
returns the input position indicator
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(membro pubblico funzione) [edit]
restituisce l'indicatore di posizione di uscita
Original:
returns the output position indicator
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(membro pubblico of std::basic_ostream funzione) [edit]
imposta l'indicatore di posizione di uscita
Original:
sets the output position indicator
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(membro pubblico of std::basic_ostream funzione) [edit]