设计模式--装饰器模式 

 1 #include <iostream>
 2 using namespace std;
 3 
 4 class A
 5 {
 6     public:
 7         virtual void doTask(){
 8             cout<<"A Task"<<endl;
 9         };
10 };
11 
12 class B : public A
13 {
14     public:
15         B(A* a)
16         {
17             _m = a; 
18         }
19 
20         void doTask()
21         {
22             _m->doTask();
23             cout<<"then B Task"<<endl;
24         }
25 
26     private:
27         A* _m;
28 };
29 
30 class C : public A
31 {
32     public:
33         C(A* a)
34         {
35             _m = a;
36         }
37 
38         void doTask()
39         {
40             _m->doTask();
41             cout<<"then C Task"<<endl;
42         }
43 
44     private:
45         A* _m;
46 };
47 
48 int main()
49 {
50     C c(new B(new A()));
51     c.doTask();
52     return 0;
53 }

 

posted @ 2015-12-22 16:08  JinleiZhang  阅读(173)  评论(0)  编辑  收藏  举报