class event { 
   event  
  protected:
  event(event* x) : ev(x) {}
  public:
  int type() { return ev->type(); }
  void* rawevent() { return ev; }
  private:
  event* ev;
  };
  
  class xevent : public event { 
   X  
  public:
  int type() { return X->type(); }
  private:
  struct XEvent* X;
  };