////   This file contains the C++ code from Program 15.1 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_01.cpp//template <class T>class Sorter{protected:    unsigned int n;    static void Swap (T&, T&);    virtual void DoSort (Array<T>&) = 0;public:    void Sort (Array<T>&);};