适配器模式

适配器模式是一种创建型模式。如下：

#include <iostream>
using namespace std;
class powerA{
public:
    virtual void connect(){
        cout << "i am powerA working..." << endl;
    }   
};

class powerB{
public:
    void connect(){
        cout << "i am powerB working..." << endl;
    }   
};

class Adaptor : public powerA{
public:
    powerB pb; 
    Adaptor(powerB &pob){
        pb = pob;
    }   
    virtual void connect(){
        pb.connect();
    }   
};

void testwork(powerA &A){
    cout << "connect..." << endl;
    A.connect();
    cout << "finished." << endl;
}

int main(){
    powerA pa;
    testwork(pa);

    powerB pb;
    Adaptor adaptor(pb);
    testwork(adaptor);

    return 0;
}

怎么有点像中介者模式呢？先提个问题，下篇看下两者之间的异同点。