/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * 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. */class MyClass {  private:    int value;  public:    friend bool operator < (MyClass const& x, MyClass const& y) {        return x.value < y.value;    }    friend std::ostream& operator << (std::ostream& strm, MyClass const& x) {        strm << x.value;        return strm;    }};