Mine

union ucallback{    void* ptr;};class ICallBack{    public:        virtual void Call(ucallback param) = 0;};template <class T, void (T::*Method)(ucallback)>class CPP_CallBack : public ICallBack{    public:        CPP_CallBack(T& owner) : m_owner(owner) {}        void Call(ucallback param) { m_owner.*Method(param); }    private:        CPP_CallBack();        T& m_owner;};class C_CallBack : public ICallBack{    typedef void (*Method)(ucallback);    public:        C_CallBack(Method method) : m_method(method) {}        void Call(ucallback param) { m_method(param); }    private:        C_CallBack();        Method m_method;};