C++虚函数示例

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#include <iostream>   using namespace std;   class P{ public:     P * m_p;     P(){         this->m_p=this;     }     virtual void Intro(){         cout<<"this is P"<<endl;     } };   class S:public P{ public :     virtual void Intro(){         cout<<"this is S"<<endl;     } };   S s;   int  main(){     s.Intro();     s.m_p->Intro();     return 0; }