C++多态公有继承

SetName方法

#include <iostream>
#include <string>
#include <stdio.h>
using namespace std;

class student{
public:
    student(){
        printf("%s constructor\n", __FUNCTION__);
    }
    virtual ~student(){
        printf("%s destructor\n", __FUNCTION__);
    }

    virtual void SetName(string name){
        printf("%s name = %s\n", __FUNCTION__, name.c_str());
        m_name = name;
    }
private:
    string m_name;
};

class studentLeader:public student{
public:
    studentLeader() {
        printf("%s constructor\n", __FUNCTION__);
    }
    virtual ~studentLeader(){
        printf("%s destructor\n", __FUNCTION__);
    }
    //virtual 可选，因为基数student已经声名为virtual，这里再次声名是说明重载基数的同名方法
    virtual void SetName(string name){
        m_name = name + "--second--";
        printf("%s name = %s\n", __FUNCTION__, m_name.c_str());
    }
private:
    string m_name;
};

class studentLeader2:public studentLeader{
public:
    studentLeader2() {
        printf("%s constructor\n", __FUNCTION__);
    }
    ~studentLeader2(){
        printf("%s destructor\n", __FUNCTION__);
    }
private:
    string m_name;
};

int main(int argc, char **argv)
{
    studentLeader2*s = new studentLeader2();
    s->SetName("12");
    delete s;
    return 0;
}

./a.out

student constructor
studentLeader constructor
studentLeader2 constructor
SetName name = 12--second--
~studentLeader2 destructor
~studentLeader destructor
~student destructor