C++版“简单工厂模式”实例代码

#include <iostream>
using namespace std;

const int apple_size = 10;
const int banana_size = 20;

//********************************fruit interface
class fruit
{
public:
    virtual void name()=0;
    virtual int size()=0;
    //virtual ~fruit();
};

//**********************************apple instance
class apple : public fruit
{
public:
    void name();
    int size();
};

void apple::name()
{
    cout<<"apple\n";
}

int apple::size()
{
    return apple_size;
}

//*********************************banana instance
class banana : public fruit
{
public:   
    void name();
    int size();
};

void banana::name()
{
    cout<<"banana\n";
}

int banana::size()
{
    return banana_size;
}

//**********************************fruit factory
class garden
{
public:
    static fruit* produce_apple()
    {
        return new apple();
    }

    static fruit* produce_banana()
    {
        return new banana();
    }
};

int main()
{
    fruit* ap,* ba;
    ap = garden::produce_apple();
    ba = garden::produce_banana();
    ap->name();
    ba->name();
    return 0;
}