1 #include <iostream>
2 #include <string>
3
4 using std::string;
5 using std::cout;
6 using std::endl;
7
8 class Component
9 {
10 public:
11 virtual void Operation() = 0;
12 };
13
14 class ConcreteComponent : public Component
15 {
16 public:
17 void Operation()
18 {
19 cout<<"具体对象的操作"<<endl;
20 }
21 };
22
23 //装饰抽象类
24 class Decorator : public Component
25 {
26 public:
27 void SetComponent(Component* component)
28 {
29 this->component = component;
30 }
31 void Operation()
32 {
33 component->Operation();
34 }
35 private:
36 Component* component;
37 };
38
39 //具体装饰类A
40 class ConcretorDecoratorA : public Decorator
41 {
42 public:
43 void Operation()
44 {
45 Decorator::Operation();
46 addedState = "new state";
47 cout<<"具体对象A的操作"<<endl;
48
49 }
50 private:
51 string addedState;
52 };
53
54 //具体装饰类B
55 class ConcretorDecoratorB : public Decorator
56 {
57 public:
58 void Operation()
59 {
60 Decorator::Operation();
61 AddedBehavior();
62 cout<<"具体对象B的操作"<<endl;
63 }
64 void AddedBehavior()
65 {
66 cout<<"具体装饰类B新增加的功能"<<endl;
67 }
68 };
69
70 int main()
71 {
72 //客户端实现
73 ConcreteComponent* c = new ConcreteComponent();
74 ConcretorDecoratorA *pa = new ConcretorDecoratorA();
75 ConcretorDecoratorB *pb = new ConcretorDecoratorB();
76
77 pa->SetComponent(c);
78 pb->SetComponent(pa);
79 pb->Operation();
80 return 0;
81 }
代码
