1 #include <iostream>
2 #include <string>
3
4 using namespace std;
5
6 class Component
7 {
8 public:
9 virtual void operation() = 0;
10 };
11
12 class ConcreteComponentA: public Component
13 {
14 public:
15 virtual void operation()
16 {
17 cout<< "ConcreteComponentA....."<< endl;
18 }
19 };
20
21 class ConcreteComponentB: public Component
22 {
23 public:
24 virtual void operation()
25 {
26 cout<< "ConcreteComponentB....."<< endl;
27 }
28 };
29
30 class Decorator:public Component
31 {
32 public:
33 Decorator(Component* pCom):component(pCom){}
34
35 virtual void operation() = 0;
36
37 Component* component;
38 };
39
40 class ConcreteDecoratorA: public Decorator
41 {
42 public:
43 ConcreteDecoratorA(Component* pCom):Decorator(pCom){}
44
45 void operation()
46 {
47 component->operation();
48 AddBehavior();
49 }
50
51 void AddBehavior()
52 {
53 cout<< "ConcreteDecoratorA....."<< endl;
54 }
55 };
56
57 class ConcreteDecoratorB: public Decorator
58 {
59 public:
60 ConcreteDecoratorB(Component* pCom):Decorator(pCom){}
61
62 void operation()
63 {
64 component->operation();
65 AddBehavior();
66 }
67
68 void AddBehavior()
69 {
70 cout<< "ConcreteDecoratorB....."<< endl;
71 }
72 };
73
74 int main(int argc, char* argv[])
75 {
76 ConcreteComponentB* ccB = new ConcreteComponentB();
77
78 ConcreteDecoratorA* cdA1 = new ConcreteDecoratorA(ccB);
79
80 ConcreteDecoratorA* cdA2 = new ConcreteDecoratorA(cdA1);
81
82 ConcreteDecoratorB* cdB1 = new ConcreteDecoratorB(cdA1);
83
84 cdA1->operation();cout<< endl;
85 cdA2->operation();cout<< endl;
86 cdB1->operation();cout<< endl;
87
88 return 0;
89 }
90
91 ///////////////////////////
92 [root]$ ./decorator
93 ConcreteComponentB.....
94 ConcreteDecoratorA.....
95
96 ConcreteComponentB.....
97 ConcreteDecoratorA.....
98 ConcreteDecoratorA.....
99
100 ConcreteComponentB.....
101 ConcreteDecoratorA.....
102 ConcreteDecoratorB.....
