#include <iostream>
#include <fstream>
using namespace std;
 
void redirect(ostream&);
 
int main()
{
  cout << "the first row" << endl;
 
  redirect(cout);
 
  cout << "the last row" << endl;
}
 
 
void redirect (ostream& strm)
{
  ofstream file("redirect.txt");
 
  // save output buffer of the stream
  streambuf* strm_buffer = strm.rdbuf();
 
  // redirect ouput into the file
  strm.rdbuf (file.rdbuf());
 
  file << "one row for the file" << endl;
  strm << "one row for the stream" << endl;
 
  // restore old output buffer
  strm.rdbuf (strm_buffer);
 
}    // closes file AND its buffer automatically