////   This file contains the C++ code from Program 8.12 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/pgm08_12.cpp//Object& ChainedHashTable::Find (Object const& object) const{    ListElement<Object*> const* ptr;    for (ptr = array [H (object)].Head ();	ptr != 0; ptr = ptr->Next())    {	if (object == *ptr->Datum ())	    return *ptr->Datum ();    }    return NullObject::Instance ();}