//
//   This file contains the C# code from Program 6.13 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_13.txt
//
public interface Queue : Container
{
    object Head { get; }
    void Enqueue(object obj);
    object Dequeue();
}