1class wheel 2{ 3public: 4         wheel(std::string n,int l) 5        :name(n),loadCapacity(l) 6        {} 7        wheel( ) 8         :name(""),loadCapacity(0) 9        {}10void show();11         wheel * Clone();12private:13         std::string name;14int loadCapacity;15};16void wheel::show( )17{18     std::cout<<"The wheel name is "<<name<<std::endl;19     std::cout<<"The wheel loadCapacity is "<<loadCapacity<<std::endl;20}2122 wheel * wheel::Clone()23{24returnnew wheel(name,loadCapacity);25}2627class Car28{29public:30         Car(std::string color,wheel* w,std::string engine)3132        :_color(color),_wheel(w),_engine(engine)33        {}34virtual Car* Clone( )=0；35virtualvoid Show( )=0；36virtualvoid  setColor(std::string color )=0;37virtual ~Car( ){}38protected:39         std::string _color;40//有一个资源41         wheel* _wheel;42         std::string _engine;43};4445class BenzCar:public Car46{47public:48         BenzCar(std::string color,wheel *w,std::string engine)49        :Car(color,w,engine)50        { }51         ~BenzCar( );52void Show( );53         Car * Clone( );54void setColor( std::string color );55};5657 BenzCar::~BenzCar( )58{59    delete _wheel;60}61 Car* BenzCar::Clone( )62{63     wheel* l=_wheel.Clone( );   64     Car * pc=new BenzCar(_color,l, _engine );65return pc;66}67void BenzCar::Show( )68{69     std::cout<<"The car's color is"<<_color<<std::endl;70    _wheel.show( );71     std::cout<<"The car's engine is"<<_engine<<std::endl;72}7374void BenzCar::setColor(std::string color )75{76     _color=color;77}7879int main(int argc,char ** argv)80{81     wheel *l=new wheel("michelin",160);82     BenzCar bc("red",l,"made in China");83     std::auto_ptr<Car> pc(bc.Clone( ));84     pc-set("white");85     pc->Show( );86     bc->Show( );87return0;88 }