////   This file contains the C++ code from Program 15.3 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/pgm15_03.cpp//template <class T>class InsertionSorter : public Sorter<T> {};template <class T>class ExchangeSorter : public Sorter<T> {};template <class T>class SelectionSorter : public Sorter<T> {};template <class T>class MergeSorter : public Sorter<T> {};template <class T>class DistributionSorter : public Sorter<T> {};