#ifndef SYSTEM_H_B61A8CEA
#define SYSTEM_H_B61A8CEA

class Game;

class System {
  public:
    System(Game& game)
      : game(game) {}
    
    virtual void tick(double dt) = 0;
    
  protected:
    Game& game;
};

#endif /* end of include guard: SYSTEM_H_B61A8CEA */