class visionary;   //forward declaration

template <>      //specialization of a template class
class game<visionary>: public virtual game_base {
	game(const terminal_t::value_type& c = '.'): game_base(c) {}

	friend class visionary;
	typedef master_t::const_iterator const_iterator;
	const_iterator begin() const {return master.begin();}
	const_iterator   end() const {return master.end();}

	//a friend of class wabbit
	void difference(const wabbit *w1, const wabbit *w2, int *dx, int *dy);
};

class visionary: public virtual wabbit {
	game<visionary> *const g;
	game *get_game() const {return g;}

	terminal_t::difference_type decide() const {g->begin();}
};