// Main game class that handles the main game mechanics and such.class game{	/* ... */};// Game objectclass entity{protected:	game	&m_game; // This object's local instance of game (in case there are multiple instances of "game")	public:	entity( game &g ) : m_game( g ) { }	virtual ~entity() { }		virtual bool step( double dt ) = 0; // Advance this object's logic	virtual void draw( const camera &cam ) = 0; // Draw this object using "cam"};// This class contains the common properties between the player and monstersclass player_base : public entity{protected:	int hp, mp, sp; // etc...	public:	player_base( game &g, /* ... */ ) : entity( g ) { }	virtual ~player_base() { }		int &get_hp() { return hp; }	};// The player, who moves around accomplishing goalsclass player : public player_base { /* ... */ };// Rats you occasionally battle in some grass class npc_giant_rat : public player_base { /* ... */ };// This class contains the common properties between all times of itemsclass item : public entity{protected:	player_base	*m_owner; // Who's carrying this item, 0 if it's laying out in the world	public:	item( game &g, player_base *owner = 0 ) : entity( g ), m_owner( owner ) { /* ... */ }	virtual ~item() { /* ... */ }		virtual const char *get_name() const = 0; // Returns the specific name of the item	virtual const char *get_description() const = 0; // Returns the description of what this item does		// If any of these three functions return true, the 	virtual bool consume( player_base *target ) const { return false; }  // Uses the item, target specifies who to use it on	virtual bool equip( player_base *target ) const { return false; }  // Modifies the target's stats	virtual bool unequip( player_base *target ) const { return false; } // Unmodifies the changes to the target's stats		virtual bool is_equipable() const = 0; // Ask if this item can be equipped, such as a weapon	virtual bool is_consumable() const = 0; // Ask if this item can be consumed, such as a potion};// Sample item that recovers a target's hpclass item_potion : public item{protected:public:	item_potion( game &g, player_base *parent = 0 ) : item( g, parent ) { }	~item_potion() { }		const char *get_name() const { return "Potion"; }	const char *get_description() const { return "Recovers +12 HP"; }		bool consume( player_base *target )	{		if ( m_parent ) 		{			m_parent->get_hp() += 12;		}						return false; // destroy item	}		void draw( const camera &cam ) {}	bool step( const double dt ) { return false; }		bool is_equipable() { return false; }	bool is_consumable() { return true; }};

std::list<item*>  m_items;// OR, if you the list to take ownership of the objects:// boost::ptr_list<item> m_items;m_items.push_back( new item_potion( /* ... */ ) );m_items.push_back( new item_sword( /* ... */ ) );