Get position of the get pointer.
  Returns the position of the get pointer. The get pointer determines the next location to be read in the buffer associated to the input stream.  

Parameters.

none

 

Return Value.
  The function returns an object of type streampos describing the current position of the get pointer in the stream.

Example.

// read a file into memory
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  int length;
  char * buffer;

  ifstream is;
  is.open ("test.txt", ios::binary );

  // get length of file:
  is.seekg (0, ios::end);
  length = is.tellg();
  is.seekg (0, ios::beg);

  // allocate memory:
  buffer = new char [length];

  // read data as a block:
  is.read (buffer,length);

  is.close();

  cout.write (buffer,length);

  return 0;
}

Basic template member declaration (basic_istream<charT,traits>):

typedef traits::pos_type pos_type; pos_type tellg ();

See also.
  seekg, ostream::tellp, ostream::seekp,
  istream class