3 public delegate bool UnaryOperator(object self, out object res);
4 public void AddOperator(UnaryOperator target) {}
5 public bool TryGetValue(object self, out object value)
11 public static void Main ()
17 AddOperator (delegate(object self, out object res) {
19 if (TryGetValue(self, out value)) {
21 if (res != null) return true;