#include 
     
      using namespace std;class buildcomputer{public:    buildcomputer(){}    virtual ~buildcomputer(){}    virtual void buildmouse()=0;    virtual void buildmointor()=0;    virtual void buildkeyboard()=0;    virtual void buildhost()=0;};class winbuildcomputer : public buildcomputer{public:    winbuildcomputer(){}    virtual ~winbuildcomputer(){}    void buildmouse(){cout<<"build win mouse"<
      
       buildmouse();        instance->buildmointor();        instance->buildkeyboard();        instance->buildhost();    }};int main(){    buildcomputer *p=new macbuildcomputer;    director *dc=new director(p);    dc->creator();    delete dc;    delete p;    p=new winbuildcomputer;    dc=new director(p);                dc->creator();    delete dc;    delete p;    system("pause");    return 0;}