pgm16_09.txt

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//
//   This file contains the C# code from Program 16.9 of
//   "Data Structures and Algorithms
//    with Object-Oriented Design Patterns in C#"
//   by Bruno R. Preiss.
//
//   Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng.  All rights reserved.
//
//   http://www.brpreiss.com/books/opus6/programs/pgm16_09.txt
//
public abstract class AbstractGraph : AbstractContainer, Graph
{
    protected int numberOfVertices;
    protected int numberOfEdges;
    protected Vertex[] vertex;

    public void BreadthFirstTraversal(
	Visitor visitor, int start)
    {
	bool[] enqueued = new bool[numberOfVertices];
	for (int v = 0; v < numberOfVertices; ++v)
	    enqueued[v] = false;

	Queue queue = new QueueAsLinkedList();

	queue.Enqueue(vertex[start]);
	enqueued[start] = true;
	while (!queue.IsEmpty && !visitor.IsDone)
	{
	    Vertex v = (Vertex)queue.Dequeue();
	    visitor.Visit(v);
	    foreach (Vertex to in v.Successors)
	    {
		if (!enqueued[to.Number])
		{
		    queue.Enqueue(to);
		    enqueued[to.Number] = true;
		}
	    }
	}
    }
    // ...
}