//
//   This file contains the C# code from Program 6.22 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/pgm06_22.txt
//
public class DequeAsArray : QueueAsArray, Deque
{
    public void EnqueueHead(object obj)
    {
	if (count == array.Length)
	    throw new ContainerFullException();
	if (head-- == 0)
	    head = array.Length - 1;
	array[head] = obj;
	++count;
    }

    public object DequeueHead()
	{ return Dequeue(); }
    // ...
}