////   This file contains the C++ code from Program 7.4 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/pgm07_04.cpp//bool ListAsArray::IsMember (Object const& object) const{    for (unsigned int i = 0; i < count; ++i)	if (array [i] == &object)	    return true;    return false;}Object& ListAsArray::Find (Object const& object) const{    for (unsigned int i = 0; i < count; ++i)	if (*array [i] == object)	    return *array [i];    return NullObject::Instance ();}