?? pgm16_10.cpp
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//// This file contains the C++ code from Program 16.10 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/pgm16_10.cpp//class CountingVisitor : public Visitor{ unsigned int count;public: CountingVisitor () : count (0) {} void Visit (Object&) { ++count; } unsigned int Count () const { return count; }};bool Graph::IsConnected () const{ CountingVisitor visitor; DepthFirstTraversal (PreOrder (visitor), SelectVertex (0)); return visitor.Count () == numberOfVertices;}
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