////   This file contains the C++ code from Program 14.3 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/pgm14_03.cpp//Solution& Solver::Solve (Solution const& initial){    bestSolution = 0;    bestObjective = numeric_limits<int>::max ();    DoSolve (initial);    if (bestSolution == 0)	throw domain_error ("no feasible solution found");    return *bestSolution;}void Solver::UpdateBest (Solution const& solution){    if (solution.IsFeasible() &&	solution.Objective () < bestObjective)    {	delete bestSolution;	bestSolution = &(solution.Clone ());	bestObjective = solution.Objective ();    }}