////   This file contains the C++ code from Program 5.17 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm05_17.cpp//class Ownership{    bool isOwner;protected:    Ownership () : isOwner (true)	{}    Ownership (Ownership& arg) : isOwner (arg.isOwner)	{ arg.isOwner = false; }public:    void AssertOwnership ()	{ isOwner = true; }    void RescindOwnership ()	{ isOwner = false; }    bool IsOwner () const	{ return isOwner; }};