Template mode (C ++)

#include <iostream>using namespace std;class Road{public:    Road(){}    virtual ~Road(){}    void operation()    {        start();        step1();        step2();        step3();        end();    }    void start(){cout<<"start"<<endl;}    void end(){cout<<"end"<<endl;}    virtual void step1()=0;    virtual void step2()=0;    virtual void step3()=0;};class way1 : public Road{public:    way1(){}    virtual ~way1(){}    void step1(){cout<<"way1_step1"<<endl;}    void step2(){cout<<"way1_step2"<<endl;}    void step3(){cout<<"way1_step3"<<endl;}};class way2 : public Road{public:    way2(){}    virtual ~way2(){}    void step1(){cout<<"way2_step1"<<endl;}    void step2(){cout<<"way2_step2"<<endl;}    void step3(){cout<<"way2_step3"<<endl;}};int main(){    Road *pr1=new way1;    Road *pr2=new way2;    pr1->operation();    pr2->operation();    delete pr2;    delete pr1;    system("pause");    return 0;}