// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// <OWNER>Microsoft</OWNER>
// 
 
namespace System.Collections {
 
    using System;
 
    // Useful base class for typed readonly collections where items derive from object
    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)]
    public abstract class ReadOnlyCollectionBase : ICollection {
        ArrayList list;
 
        protected ArrayList InnerList {
            get { 
                if (list == null)
                    list = new ArrayList();
                 return list; 
            }
        }
 
        public virtual int Count {
            get { return InnerList.Count; }
        }
 
        bool ICollection.IsSynchronized {
            get { return InnerList.IsSynchronized; }
        }
 
        object ICollection.SyncRoot {
            get { return InnerList.SyncRoot; }
        }
 
        void ICollection.CopyTo(Array array, int index) {
            InnerList.CopyTo(array, index);
        }
 
        public virtual IEnumerator GetEnumerator() {
            return InnerList.GetEnumerator();
        }
    }
 
}