////   This file contains the C++ code from Program 8.18 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_18.cpp//OpenScatterTable::Entry::Entry () :    state (empty),    object (0)    {}OpenScatterTable::OpenScatterTable (unsigned int _length) :    HashTable (_length),    array (_length)    {}void OpenScatterTable::Purge (){    for (unsigned int i = 0; i < length; ++i)    {	if (array [i].state == Entry::occupied)	{	    if (IsOwner ())		delete array [i].object;	    array [i] = Entry ();	}    }    count = 0;}OpenScatterTable::~OpenScatterTable ()    { Purge (); }