Hi, below is my code: template< InputSubscription t_sub > static void subscribe( SignalBank const& bank, typename GetSignal<t_sub>::signal::slot_type& slot ) { using boost::fusion::at_c; at_c<t_sub>( bank.signals ).connect( slot ); } void mouseCB( int, int ) { } void footest() { SignalBank bank; //boost::fusion::at_c<1>( bank.signals )( 3, 4 ); subscribe<INPUTSUB_MOUSE_MOTION>( bank, &mouseCB ); }; Notice that I have a wrapper function, 'subscribe', which uses the slot_type member of the signals class to pass the slot to the connect() function. However, visual studio 9 reports the following error: *error C2664: 'bob::input::subscribe' : cannot convert parameter 2 from 'void (__cdecl *)(int,int)' to 'boost::slot<SlotFunction> &' with [ SlotFunction=boost::function<void (int,int)> ] *Any solutions to fix the problem?* *