程序優化是用于消除程序中大量的if else這種判斷語句

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<<"應付價錢為： "<< stCashContext->GetTotalCash(100)<< endl; 69 70 stCashContext = new CashContext(new CashRebate(0.8)); 71 72 cout<<"應付價錢為： "<< stCashContext->GetTotalCash(100)<< endl; 73 74 return 0; 75 } 76 /// 77 [root]$ ./strategy 78 應付價錢為： 100 79 應付價錢為： 80

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轉載于:https://www.cnblogs.com/070412-zwc/p/6766946.html

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