class Main : public Application, public EventListener
  {
      public:
          virtual int main(const List<String>& args)
          {
              root = Root::instance();
  
              video = root->videoManager();
  
              input = root->inputManager();
  
              video->init(Size(640, 480), 32, "Hello World", false);
  
              while (root->running())
              {
                  input->capture();
  
                  video->beginDraw();
  
                  // draw everthing
  
                  video->endDraw();
              }
  
              return 0;
          }
  
      protected:
          virtual void quitEvent()
          {
              root->shutdown();
          }
  
      private:
          Root* root;
          VideoManager* video;
          InputManager* input;
  } app;