basic_ostringstream::rdbuf

To retrieve a pointer to the stream buffer.

basic_stringbuf<charT, traits>* rdbuf() const;

To manipulate a stream for random access or synchronization it is necessary to retrieve a pointer to the streams buffer. The function rdbuf() allows you to retrieve this pointer.

A pointer to an object of type basic_stringbuf sb is returned by the rdbuf function.

basic_ostringstream::rdbuf()

basic_ios::rdbuf()

basic_stringstream::rdbuf()

#include <iostream>
#include <sstream>
#include <string>

std::string motto = "CodeWarrior - \"Software at Work\""; 

int main()
{
using namespace std;
   ostringstream ostr(motto); 
   streampos cur_pos(0), start_pos(0);
   cout << "The original array was :\n" 
      << motto << "\n\n"; 
      // associate buffer

   stringbuf *strbuf(ostr.rdbuf()); 
   streamoff str_off = 10; 
   cur_pos = ostr.tellp();
   cout << "The current position is " 
          << static_cast<streamoff>(cur_pos);
          << " from the beginning\n";

   ostr.seekp(str_off); 
   cur_pos = ostr.tellp(); 
   cout << "The current position is " 
          << static_cast<streamoff>(cur_pos); 
          << " from the beginning\n";

   strbuf->sputc('\0');
   cout << "The stringbuf array is\n" 
      << strbuf->str() << "\n\n";

   cout << "The ostringstream array is still\n" 
      << motto;
  return 0;
}

Results:

  The original array was :
  CodeWarrior - "Software at Work"
  The current position is 0 from the beginning
  The current position is 10 from the beginning

  The stringbuf array is
  CodeWarrior
  CodeWarrior - "Software at Work"