C++设计模式中的桥模式你了解吗

class Messager {
public:
    virtual void Login(string username, string passWord) = 0;
    virtual void SendMessage(string message) = 0;
    virtual void SendPicture(Image image) = 0;
    virtual void PlaySound() = 0;
    virtual void DrawShape() = 0;
    virtual void WriteText() = 0;
    virtual void Connect() = 0;
    virtual ~Messager() {}
};
//平台实现
class PCMessagerBase : public Messager {
public:
    virtual void PlaySound() {
        //**********
    }
    virtual void DrawShape() {
        //**********
    }
    virtual void WriteText() {
        //**********
    }
    virtual void Connect() {
        //**********
    }
};
class MobileMessagerBase : public Messager {
public:
    virtual void PlaySound() {
        //==========
    }
    virtual void DrawShape() {
        //==========
    }
    virtual void WriteText() {
        //==========
    }
    virtual void Connect() {
        //==========
    }
};
//业务抽象
class PCMessagerLite : public PCMessagerBase {
public:
    virtual void Login(string username, string password) {
        PCMessagerBase::Connect();
        //........
    }
    virtual void SendMessage(string message) {
        PCMessagerBase::WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        PCMessagerBase::DrawShape();
        //........
    }
};
class PCMessagerPerfect : public PCMessagerBase {
public:
    virtual void Login(string username, string password) {
        PCMessagerBase::PlaySound();
        //********
        PCMessagerBase::Connect();
        //........
    }
    virtual void SendMessage(string message) {
        PCMessagerBase::PlaySound();
        //********
        PCMessagerBase::WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        PCMessagerBase::PlaySound();
        //********
        PCMessagerBase::DrawShape();
        //........
    }
};
class MobileMessagerLite : public MobileMessagerBase {
public:
    virtual void Login(string username, string password) {
        MobileMessagerBase::Connect();
        //........
    }
    virtual void SendMessage(string message) {
        MobileMessagerBase::WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        MobileMessagerBase::DrawShape();
        //........
    }
};
class MobileMessagerPerfect : public MobileMessagerBase {
public:
    virtual void Login(string username, string password) {
        MobileMessagerBase::PlaySound();
        //********
        MobileMessagerBase::Connect();
        //........
    }
    virtual void SendMessage(string message) {
        MobileMessagerBase::PlaySound();
        //********
        MobileMessagerBase::WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        MobileMessagerBase::PlaySound();
        //********
        MobileMessagerBase::DrawShape();
        //........
    }
};
void Process() {
    //编译时装配
    Messager* m = new MobileMessagerPerfect();
}

class Messager {
protected:
    MessagerImp* messagerImp;//...
public:
    virtual void Login(string username, string password) = 0;
    virtual void SendMessage(string message) = 0;
    virtual void SendPicture(Image image) = 0;
    virtual ~Messager() {}
};
class MessagerImp {
public:
    virtual void PlaySound() = 0;
    virtual void DrawShape() = 0;
    virtual void WriteText() = 0;
    virtual void Connect() = 0;
    virtual MessagerImp() {}
};
//平台实现 n
class PCMessagerImp : public MessagerImp {
public:
    virtual void PlaySound() {
        //**********
    }
    virtual void DrawShape() {
        //**********
    }
    virtual void WriteText() {
        //**********
    }
    virtual void Connect() {
        //**********
    }
};
class MobileMessagerImp : public MessagerImp {
public:
    virtual void PlaySound() {
        //==========
    }
    virtual void DrawShape() {
        //==========
    }
    virtual void WriteText() {
        //==========
    }
    virtual void Connect() {
        //==========
    }
};
//业务抽象 m
//类的数目：1+n+m
class MessagerLite :public Messager {
public:
    virtual void Login(string username, string password) {
        messagerImp->Connect();
        //........
    }
    virtual void SendMessage(string message) {
        messagerImp->WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        messagerImp->DrawShape();
        //........
    }
};
class MessagerPerfect :public Messager {
public:
    virtual void Login(string username, string password) {
        messagerImp->PlaySound();
        //********
        messagerImp->Connect();
        //........
    }
    virtual void SendMessage(string message) {
        messagerImp->PlaySound();
        //********
        messagerImp->WriteText();
        //........
    }
    virtual void SendPicture(Image image) {
        messagerImp->PlaySound();
        //********
        messagerImp->DrawShape();
        //........
    }
};
void Process() {
    //运行时装配
    MessagerImp* mImp = new PCMessagerImp();
    Messager* m = new Messager(mImp);
}