EventSource.h

 
#pragma once
 
#include <unordered_set>
 
namespace engine {
    class EventSite;
 
    class EventSource {
      public:
        EventSource() = default;
        virtual ~EventSource() = default;
 
        void subscribe(EventSite* site);
        void unsubscribe(EventSite* site);
 
        template <typename TEventSite, typename TEvent>
        void fireEvent(void (TEventSite::*fire)(TEvent* event), TEvent* event) {
            for (EventSite* site : m_sources) {
                TEventSite* appSite = dynamic_cast<TEventSite*>(
                    site
                );  // TODO I dont like the dynamic cast and virtual inheritance of EventClass (right now only because of UI manager diamond inheritance)
                if (appSite) {
                    (appSite->*fire)(event);
                }
            }
        }
 
      private:
        std::unordered_set<EventSite*> m_sources;
    };
}  // namespace engine