ex18_1.cpp

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/* Code for exercise 18.1.
 | 
 | "C++ Solutions--Companion to The C++ Programming Language, Third Edition"
 | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3.
 |
 | Permission to use, copy, modify, distribute and sell this software
 | and its documentation for any purpose is hereby granted without fee.
 | The author makes no representations about the suitability of this
 | software for any purpose.  It is provided "as is" without express or
 | implied warranty.
 `----------------------------------------------------------------------*/

#include <algorithm>
#include <iostream>
#include <vector>

template<typename R, typename T, typename P1>
struct mem_fun1_ref_t {
   typedef R return_type;
   typedef T first_argument_type;
   typedef P1 second_argument_type;
   typedef R (T::*PMF)(P1); // PMF is a pointer-to-member-
                            // function type (