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std::basic_istream::tellg

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< cpp‎ | io‎ | basic istream

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
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Streams
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Astrazioni
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Gli oggetti globali
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Global objects
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cin
wcin
Membri funzioni
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Ingresso formattato
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Formatted input
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basic_istream::operator>>
Ingresso non formattato
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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
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Positioning
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basic_istream::tellg
basic_istream::seekg
Varie
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Membri classi
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Member classes
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basic_istream::sentry
Non membri funzioni
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Non-member functions
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operator>>(std::basic_istream)
 
pos_type tellg();

Returns input position indicator of the current associated streambuf object.

Behaves as UnformattedInputFunction. After constructing and checking the sentry object, if fail()==true, returns pos_type(-1). Otherwise, returns rdbuf()->pubseekoff(0, std::ios_base::cur, std::ios_base::in).

Indice

[modifica] Parametri

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

current position of the get pointer on success, pos_type(-1) on failure

[modifica] Esempio

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    std::string str = "Hello, world";
    std::istringstream in(str);
    std::string word;
    in >> word;
    std::cout << "After reading the word \"" << word
              << "\" tellg() returns " << in.tellg() << '\n';
}

Output:

After reading the word "Hello," tellg() returns 6

[modifica] Vedi anche

sets the input position indicator
(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]