策略模式

 1 /*
 2   * 策略模式
 3   */
 4 
 5 #include <iostream>
 6 #include <cmath>
 7 #include <string>
 8 using namespace std;
 9 
10 class CashSuper
11 {
12 public:
13     virtual double acceptMoney(double money) = 0;
14 };
15 
16 class CashNormal : public CashSuper
17 {
18 public:
19     double acceptMoney(double money)
20     {
21         return money;
22     }
23 };
24 
25 class CashRebate : public CashSuper
26 {
27 private:
28     double discount;
29 
30 public:
31     CashRebate(double dis)
32     {
33         discount = dis;
34     }
35     double acceptMoney(double money)
36     {
37         return money * discount;
38     }
39 };
40 
41 
42 class CashReturn : public CashSuper
43 {
44 private:
45     double moneyCondition;
46     double moneyReturn;
47 
48 public:
49     CashReturn(double mc, double mr)
50     {
51         moneyCondition = mc;
52         moneyReturn = mr;
53     }
54     double acceptMoney(double money)
55     {
56         double result = money;
57         if (money >= moneyCondition)
58         {
59             result = money - floor(money / moneyCondition) * moneyReturn;
60         }
61         return result;
62     }
63 };
64 
65 class  CashContext
66 {
67 private:
68     CashSuper *cs;
69 public:
70     CashContext(CashSuper *cs)
71     {
72         this->cs = cs;
73     }
74     double getResult(double money)
75     {
76         return cs->acceptMoney(money);
77     }
78 };
79 
80 void main()
81 {
82     CashSuper *cs;
83     CashContext *cc;
84     double money = 1000;
85 
86     cs = new CashRebate(0.8);
87     cc = new CashContext(cs);
88     cout << cc->getResult(money) << endl;
89 
90     money = 1000;
91     cs = new CashNormal();
92     cc = new CashContext(cs);
93     cout << cc->getResult(money) << endl;
94 
95 }

 1 /*
 2   * 策略与工厂模式
 3   */
 4 #include <iostream>
 5 #include <cmath>
 6 #include <string>
 7 using namespace std;
 8 
 9 class CashSuper
10 {
11 public:
12     virtual double acceptMoney(double money) = 0;
13 };
14 
15 class CashNormal : public CashSuper
16 {
17 public:
18     double acceptMoney(double money)
19     {
20         return money;
21     }
22 };
23 
24 class CashRebate : public CashSuper
25 {
26 private:
27     double discount;
28 public:
29     CashRebate(double dis)
30     {
31         discount = dis;
32     }
33     double acceptMoney(double money)
34     {
35         return money * discount;
36     }
37 };
38 
39 
40 class CashReturn : public CashSuper
41 {
42 private:
43     double moneyCondition;
44     double moneyReturn;
45 public:
46     CashReturn(double mc, double mr)
47     {
48         moneyCondition = mc;
49         moneyReturn = mr;
50     }
51     double acceptMoney(double money)
52     {
53         double result = money;
54         if (money >= moneyCondition)
55         {
56             result = money - floor(money / moneyCondition) * moneyReturn;
57         }
58         return result;
59     }
60 };
61 
62 class  CashContext
63 {
64 private:
65     CashSuper *cs;
66 public:
67     CashContext(string str)
68     {
69         if ("正常收费" == str)
70         {
71             cs = new CashNormal();
72         }
73         else if ("打9折" == str)
74         {
75             cs = new CashRebate(0.9);
76         }
77         else if ("满300送200" == str)
78         {
79             cs = new CashReturn(300, 200);
80         }        
81     }
82     double getResult(double money)
83     {
84         return cs->acceptMoney(money);
85     }
86 };
87 
88 
89 int main()
90 {
91     double money = 1000;
92     CashContext *cc = new CashContext("打9折");
93     cout << cc->getResult(money);
94     return 0;
95 }