Redirect ouput into the file : ostream « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » ostream 
12.11.6.Redirect ouput into the file
/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#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
the first row
the last row
12.11.ostream
12.11.1.Define your own ostream variable
12.11.2.file descriptor out buffer
12.11.3.stream for hexadecimal standard output
12.11.4.Switch between decimal and hexadecimal output
12.11.5.Hex out stream
12.11.6.Redirect ouput into the file
12.11.7.Open file ''example.dat'' for reading and writing
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