C++ basic_ios Library - tellg

Description

It is used to get position in input sequence.

Declaration

Following is the declaration for std::basic_istream::tellg.

pos_type tellg();

Parameters

none

Return Value

Returns the current position in the stream.

Exceptions

Basic guarantee − if an exception is thrown, the object is in a valid state.

Data races

Modifies the stream object.

Example

In below example for std::basic_istream::tellg.

#include <iostream>     
#include <fstream>      

int main () {
   std::ifstream is ("test.txt", std::ifstream::binary);
   if (is) {
    
      is.seekg (0, is.end);
      int length = is.tellg();
      is.seekg (0, is.beg);
    
      char * buffer = new char [length];
    
      is.read (buffer,length);
      is.close();

      std::cout.write (buffer,length);

      delete[] buffer;
   }
   return 0;
}