#include 
     
      using namespace std;class surfinternet{public:    surfinternet(){}    virtual ~surfinternet(){}    virtual void look_youtube()=0;    virtual void look_twitter()=0;    virtual void look_fackbook()=0;};class overwall : public surfinternet{public:    overwall(){}    virtual ~overwall(){}    void look_youtube(){cout<<"look youtube"<
      
       look_youtube();}    void look_twitter(){psurfnet->look_twitter();}    void look_fackbook(){psurfnet->look_fackbook();}private:    surfinternet *psurfnet;};int main(){    surfinternet *p=new proxy;    p->look_youtube();    p->look_twitter();    p->look_fackbook();    delete p;    system("pause");    return 0;}