EventDelegate.hpp

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#pragma once
 
#include <functional>

template<typename... CallbackArgs>
struct EventDelegate
{
private:
    std::function<void(CallbackArgs...)> callback;
    void* instance = nullptr;
 
public:
 
    EventDelegate() = default;
    ~EventDelegate() = default;

    template<typename BindingClass>
    EventDelegate(BindingClass* obj, void(BindingClass::*method)(CallbackArgs...)) {
        instance = obj;
        callback = [obj, method](CallbackArgs... args) { 
            (obj->*method)(std::forward<CallbackArgs>(args)...); // forward ensures value category preserved
        };
    }

    EventDelegate(void(*func)(CallbackArgs...)) {
        callback = func;
    }

    bool Fire(CallbackArgs... args) const {
        if (callback == nullptr) { return false; }
        callback( std::forward<CallbackArgs>(args)... );
        return true;
    }

    inline void* GetInstance() const { return instance; }
 
};