Visitor----------模式

来源：互联网发布：网站建设方案书阿里云编辑：程序博客网时间：2024/06/10 05:53

例子:

class Modem
{
public:
    virtual void Dial(CString pno) =0;
    virtual void Handup() =0;
    virtual void Send(char c) =0;
    virtual void Recv() = 0;
    virtual accept(ModemVisitor v)=0;
};
class HayesModem :public Modem
{

public:
    void Dial(CString pno){}
    void Handup(){}
    void Send(char c) {}
    void Recv() {}
    virtual accept(ModemVisitor v)
    {
        v.visit(this);
    }
};
class ZoomModem:public Modem
{
public:
    void Dial(CString pno){}
    void Handup(){}
    void Send(char c){}
    void Recv(){}
    virtual accept(ModemVisitor v)
    {
        v.visit(this);
    }
};
class ModemVisitor
{
public:
    void visit(HayModem modem) = 0;
    void visit(ZoomModem modem) = 0;
};
class ModemCfg :public ModemVisitor
{
public:
    void visit(HayerModem modem)
    {
        printf("I am HayerModem!");
    }
    void visit(ZoomModem modem)
    {
        printf("I am ZoomModem!");
    }
};

void main()
{
    ModemCfg* pm = new ModemCfg();
    HayerModem* ph = new HayerModem();
    ZoomModem* pz = new ZoomModem();
    vector vectmodem;
    vectmodem.push_back (ph);
    vectmodem.push_back (pz);
    for(int i = 0;i< vectmodem.size();i++)
    {
        ((Modem*)vectmodem[i]).accept(pm);
    }

vectmodem.clear();
}