簡單原廠模式（C++）

#define win 0#define mac 1#include <iostream>using namespace std;class button{public:    button(){}    virtual void createbutton()=0;};class macbutton : public button{public:    macbutton(){}    virtual void createbutton(){cout<<"macbutton"<<endl;}};class winbutton : public button{public:    winbutton(){}    virtual void createbutton(){cout<<"winbutton"<<endl;}};class simplefactory{public:    simplefactory(){}    button *createproduct(int ID);    button *createmacproduct();    button *createwinproduct();};button *simplefactory::createproduct(int ID){    if (ID==win)        return new winbutton;    if (ID==mac)        return new macbutton;}button *simplefactory::createwinproduct(){    return new winbutton;}button *simplefactory::createmacproduct(){    return new macbutton;}int main(){    simplefactory fc;    button *bt=fc.createproduct(win);    bt->createbutton();    delete bt;    system("pause");    return 0;}