gistfile1.txt

class HiddenReference<T>
{
  int id;
	static Dictionary<int, T> table = new Dictionary<int, T> ();
	static int idgen = 0;

	public HiddenReference () {
		lock (table) { id = idgen ++; }
	}

	~HiddenReference () {
		lock (table) { table.Remove (id); }
	}

	public T Value {
		get { lock (table) {return table [id]; } }
		set { lock (table) { table [id] = value; } }
	}
}