+/// Helper template class to turn a simple class member function into
+/// a callback.
+template <class T, void (T::* F)()>
+class MakeCallback : public Callback
+{
+ private:
+ T *object;
+
+ public:
+ MakeCallback(T *o)
+ : object(o)
+ { }
+
+ void process() { (object->*F)(); }
+};
+