1 #include <iostream>
 2 #include <string>
 3
 4 using namespace std;
 5
 6 class CashSuper
 7 {
 8 public:
 9         virtual double GetTotalCash(double ddwMoney) = 0;
10 };
11
12 class CashNormal:public CashSuper
13 {
14 public:
15         virtual double GetTotalCash(double ddwMoney)
16         {
17                 return ddwMoney;
18         }
19 };
20
21 class CashRebate: public CashSuper
22 {
23 public:
24         CashRebate(float dwRebate):m_Rebate(dwRebate)
25         {
26
27         }
28
29         virtual double GetTotalCash(double ddwMoney)
30         {
31                 return m_Rebate * ddwMoney;
32         }
33
34 private:
35         float m_Rebate;
36 };
37
38 class CashContext
39 {
40 public:
41         CashContext()
42         {
43         }
44
45         CashContext(CashSuper* pstTmpCashSuper)
46         {
47                 m_pstCashSuper = pstTmpCashSuper;
48         }
49
50         void SetCashStrategy(CashSuper* pstTmpCashSuper)
51         {
52                 m_pstCashSuper = pstTmpCashSuper;
53         }
54
55         double GetTotalCash(double ddwMoney)
56         {
57                 return m_pstCashSuper->GetTotalCash(ddwMoney);
58         }
59
60 private:
61         CashSuper *m_pstCashSuper;
62 };
63
64 int main(void)
65 {
66         CashContext* stCashContext = new CashContext(new CashNormal());
67
68         cout<<"应付价钱为： "<< stCashContext->GetTotalCash(100)<< endl;
69
70         stCashContext = new CashContext(new CashRebate(0.8));
71
72         cout<<"应付价钱为： "<< stCashContext->GetTotalCash(100)<< endl;
73
74         return 0;
75 }
76 ///
77 [root]$ ./strategy
78 应付价钱为： 100
79 应付价钱为： 80