C++多态公有继承

SetName方法

1. #include <iostream>
   
2. #include <string>
   
3. #include <stdio.h>
   
4. using namespace std;
   
5. 
   
6. class student{
   
7. public:
   
8.     student(){
   
9.         printf("%s constructor\n", __FUNCTION__);
   
10.     }
    
11.     virtual ~student(){
    
12.         printf("%s destructor\n", __FUNCTION__);
    
13.     }
    
14. 
    
15.     virtual void SetName(string name){
    
16.         printf("%s name = %s\n", __FUNCTION__, name.c_str());
    
17.         m_name = name;
    
18.     }
    
19. private:
    
20.     string m_name;
    
21. };
    
22. 
    
23. class studentLeader:public student{
    
24. public:
    
25.     studentLeader() {
    
26.         printf("%s constructor\n", __FUNCTION__);
    
27.     }
    
28.     virtual ~studentLeader(){
    
29.         printf("%s destructor\n", __FUNCTION__);
    
30.     }
    
31.     //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
    
32.     virtual void SetName(string name){
    
33.         m_name = name + "--second--";
    
34.         printf("%s name = %s\n", __FUNCTION__, m_name.c_str());
    
35.     }
    
36. private:
    
37.     string m_name;
    
38. };
    
39. 
    
40. class studentLeader2:public studentLeader{
    
41. public:
    
42.     studentLeader2() {
    
43.         printf("%s constructor\n", __FUNCTION__);
    
44.     }
    
45.     ~studentLeader2(){
    
46.         printf("%s destructor\n", __FUNCTION__);
    
47.     }
    
48. private:
    
49.     string m_name;
    
50. };
    
51. 
    
52. int main(int argc, char **argv)
    
53. {
    
54.     studentLeader2*s = new studentLeader2();
    
55.     s->SetName("12");
    
56.     delete s;
    
57.     return 0;
    
58. }

1. ./a.out
   
2. 
   
3. student constructor
   
4. studentLeader constructor
   
5. studentLeader2 constructor
   
6. SetName name = 12--second--
   
7. ~studentLeader2 destructor
   
8. ~studentLeader destructor
   
9. ~student destructor