class Equipment {
public:
     virtual ~Equipment();

     const char* Name() { return _name;}

     virtual Watt Power();
     virtual Currency NetPrice();
     virtual Currency DiscountPrice();

     virtual void Add (Equipment*);
     virtual void Remove (Equipment*);
     virtual Iterator<Equipment*>* CreateIterator();
protected:
     Equipment (const char*);
private:
     Const char* _name;
};

class FloppyDisk : public Equipment {
public:
     FloppyDisk (const char*);
     virtual ~FloppyDisk();

     virtual Watt Power();
     virtual Currency NetPrice();
     virtual Currency DiscountPrice();
};

class CompositeEquipment : public Equipment {
public:
     virtual ~CompositeEquipment();

     virtual Watt Power();
     virtual Currency NetPrice();
     virtual Currency DiscountPrice();

     virtual void Add(Equipment*);
     virtual void Remove (Equipment*);
     virtual Iterator<Equipment*>* CreateIterator();

protected:
     CompositeEquipment(const char*);
private:
     List<Equipment*> _equipment;
};

Currency CompositeEquipment::NetPrice() {
     Iterator<Equipment*>* i = CreateIterator();
     Currency total = 0;

     For(i->First(); !i->IsDone(); i->Next()) {
     Total += i->CurrentItem()->NetPrice();
     }
     delete i;
     return total;
}

class Chassis : public CompositeEquipment {
public:
     Chassis(const char*);
     virtual ~Chassis;

     virtual Watt Power();
     virtual Currency NetPrice();
     virtual Currency DiscountPrice();
};

Cabinet* cabinet = new Cabinet ("PC Cabinet");
Chassis* chassis = new Chassis ("PC Chassis");

Cabinet->Add(chassis);

Bus* bus = new Bus("MCA Bus");
bus->Add(new Card("16Mbs Token Ting"));

Chassis->Add(bus);
Chassis->Add(new FloppyDisk("3.5in Floppy"));

Cout << "The net price is " << chassis->NetPrice() << endl;