备忘录模式

 1 #include <iostream>
 2 #include <string>
 3 #include <vector>
 4 using namespace std;
 5 
 6 //设计备忘录三大步骤
 7 //1.设计记录的节点，存储记录，//记录鼠标，键盘的状态
 8 //2.设计记录的存储，vector,list，map,set,链表，图，数组，树
 9 //3.操作记录的类，记录节点状态，设置节点状态，显示状态，0.1秒记录一下
10 
11 
12 
13 
14 //备忘录的节点，
15 class Memo
16 {
17 public:
18     string state;
19     Memo(string state) //记录当前的状态，
20     {
21         this->state = state;
22     }
23 };
24 
25 class Originator//类的包含备忘录的节点
26 {
27 public:
28     string state;
29     void setMemo(Memo *memo)
30     {
31         state = memo->state;
32     }
33     Memo *createMemo()
34     {
35         return new Memo(state);
36     }
37     void show()
38     {
39         cout << state << endl;
40     }
41 };
42 
43 
44 //备忘录的集合
45 class Caretaker
46 {
47 public:
48     vector<Memo *> memo;
49     void save(Memo *memo)
50     {
51         (this->memo).push_back(memo);
52     }
53     Memo *getState(int i)
54     {
55 
56         return memo[i];
57     }
58 };
59 
60 int main()
61 {
62     Originator *og = new Originator();
63     Caretaker *ct = new Caretaker();
64 
65     og->state = "on";
66     og->show();
67     ct->save(og->createMemo());
68 
69     og->state = "off";
70     og->show();
71     ct->save(og->createMemo());
72 
73     og->state = "middle";
74     og->show();
75     ct->save(og->createMemo());
76 
77     og->setMemo(ct->getState(1));
78     og->show();
79 
80     og->setMemo(ct->getState(2));
81     og->show();
82     cin.get();
83     return 0;
84 }