2 #if !defined(INCLUDED_CALLBACKFWD_H)
3 #define INCLUDED_CALLBACKFWD_H
5 template<typename Return>
7 typedef Callback0<void> Callback;
9 template<typename FirstArgument, typename Result = void>
12 template<typename FirstArgument, typename SecondArgument, typename Result = void>
15 template<typename FirstArgument, typename SecondArgument, typename ThirdArgument, typename Result = void>