adapter模式

#include <iostream>
using namespace std;

class target
{
public:
    target(){}
    virtual ~target(){}

    virtual void Operation(){};
};

class adaptee{
public:
    void special_work(){
        cout<<"only I can do!!\n";
    }
};


/*类适配器模式
 * 优点：可以重定义adaptee的部分行为
 * 缺点：不能匹配adaptee的所有子类*/
class adapter: public target,private adaptee
{
public:
    virtual void Operation(){adaptee::special_work();}
};

int main()
{
    target* tmp=new adapter();
    tmp->Operation();
    return 0;
}

#include <iostream>
using namespace std;

class target
{
public:
    target(){}
    virtual ~target(){}

    virtual void Operation(){};
};

class adaptee{
public:
    void special_work(){
        cout<<"only I can do!!\n";
    }
};


/*对象适配器模式
 * 缺点：很难重新定义adaptee的行为，只能通过生成子类
 * 优点：一个adapter可以匹配adaptee的所有子类*/
class adapter: public target
{
    adaptee* p_adaptee;
public:
    adapter(adaptee* var){
        p_adaptee=var;
    }
    virtual void Operation(){p_adaptee->special_work();}
};

int main()
{
    adaptee* tmp_adaptee=new adaptee();
    target* tmp=new adapter(tmp_adaptee);
    tmp->Operation();
    return 0;
}