using System;
using System.Diagnostics;


namespace SpaceInvaders
{
    public abstract class List
    {
        //----------------------------------------------------------------
        //  PURE VIRTUAL METHODS 
        //----------------------------------------------------------------

        public abstract void AddToFront(Node pNode);

        public abstract Node RemoveFromFront();

        public abstract void Remove(Node pNode);

        public abstract Iterator GetIterator();


        //----------------------------------------------------------------
        //  VIRTUAL METHODS
        //----------------------------------------------------------------

        public virtual void AddByPriority(Node pNode)
        {
            //does nothing by default
        }

        public virtual void InsertBefore(Node pNewNode, Node pNodeAfter)
        {
            //does nothing by default
        }

        public virtual void InsertAfter(Node pNewNode, Node pNodeBefore)
        {
            //does nothing by default <--do i need this?
        }


    } // end class

} // end namespace