Factory 方法模式（C++）

#define win 0#define mac 1#include <iostream>using namespace std;class button{public:    button(){}    virtual ~button(){}    virtual void showbutton()=0;};class winbutton : public button{public:    winbutton(){}    virtual ~winbutton(){}    void showbutton(){cout<<"win button"<<endl;}};class macbutton : public button{public:    macbutton(){}    virtual ~macbutton(){}    void showbutton(){cout<<"mac button"<<endl;}};class factory{public:    factory(){}    virtual ~factory(){}    virtual button *createbutton()=0;};class winfactory : public factory{public:    winfactory(){}    virtual ~winfactory(){}    button *createbutton(){return new winbutton;}};class macfactory : public factory{public:    macfactory(){}    virtual ~macfactory(){}    button *createbutton(){return new macbutton;}};int main(){    factory *fc=new winfactory;    button *bt=fc->createbutton();    bt->showbutton();    delete bt;    delete fc;    fc=new macfactory;    bt=fc->createbutton();    bt->showbutton();    delete bt;    delete fc;    system("pause");    return 0;}