Anonymous

#include <map>class Widget {	public:		enum Signal {			NONE		};		typedef void(*Callback)(Widget&, Signal);		typedef std::pair<Widget::Signal, Callback> Event;		typedef std::multimap<Widget::Signal, Callback> EventTable;		void insert(Signal signal, Callback callback);	private:		EventTable table;};void Widget::insert(Widget::Signal signal, Widget::Callback callback) {	table.insert(signal, callback);}void bar(void);void bar(Widget& w, Widget::Signal s) {}int main() {	Widget w;	w.insert(Widget::NONE, bar);	return 0;}