设计模式——策略模式（C++实现）

程序优化是用于消除程序中大量的if else这种判断语句

 #include <iostream>
 #include <string>

 using namespace std;

 class CashSuper
 {
 public:
         virtual double GetTotalCash(double ddwMoney) = ;
 };

 class CashNormal:public CashSuper
 {
 public:
         virtual double GetTotalCash(double ddwMoney)
         {
                 return ddwMoney;
         }
 };

 class CashRebate: public CashSuper
 {
 public:
         CashRebate(float dwRebate):m_Rebate(dwRebate)
         {

         }

         virtual double GetTotalCash(double ddwMoney)
         {
                 return m_Rebate * ddwMoney;
         }

 private:
         float m_Rebate;
 };

 class CashContext
 {
 public:
         CashContext()
         {
         }

         CashContext(CashSuper* pstTmpCashSuper)
         {
                 m_pstCashSuper = pstTmpCashSuper;
         }

         void SetCashStrategy(CashSuper* pstTmpCashSuper)
         {
                 m_pstCashSuper = pstTmpCashSuper;
         }

         double GetTotalCash(double ddwMoney)
         {
                 return m_pstCashSuper->GetTotalCash(ddwMoney);
         }

 private:
         CashSuper *m_pstCashSuper;
 };

 int main(void)
 {
         CashContext* stCashContext = new CashContext(new CashNormal());

         cout<<"应付价钱为： "<< stCashContext->GetTotalCash()<< endl;

         stCashContext = new CashContext(new CashRebate(0.8));

         cout<<"应付价钱为： "<< stCashContext->GetTotalCash()<< endl;

         return ;
 }
 ///////
 [root]$ ./strategy
 应付价钱为：
 应付价钱为：