简单工厂模式（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;
}