////   This file contains the C++ code from Program 11.3 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/pgm11_03.cpp//BinaryHeap::BinaryHeap (unsigned int length) :    array (length, 1)    {}void BinaryHeap::Purge (){    if (IsOwner ())    {	for (unsigned int i = 1; i < count + 1; ++i)	    delete array [i];    }    count = 0;}BinaryHeap::~BinaryHeap ()    { Purge (); }