代理模型

class BooKStore
{
public:
    virtual void salebook()
    {
        std::cout<<"BookStore salebook"<<std::endl;
    }
};


class RealStore : public BooKStore
{
public:
    virtual void salebook()
    {
        std::cout<<"RealStore salebook"<<std::endl;
    }
};

class DangDangProxy : public BooKStore
{
public:
    virtual void salebook()
    {
        RealStore realstore;
        doubleEleven();
        realstore.salebook();
        std::cout<<"DangDangProxy salebook"<<std::endl;
    }
    void doubleEleven()
    {
        std::cout<<"doubleEleven"<<std::endl;
    }
};