////   This file contains the C++ code from Program 15.12 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/pgm15_12.cpp//template <class T>class HeapSorter : public SelectionSorter<T>{protected:    void BuildHeap (Array<T>&);    void PercolateDown (Array<T>&, unsigned int, unsigned int);    void DoSort (Array<T>&);};