大话设计模式02-策略模式-2020-9-18

#include<exception>
#include <iostream>
using namespace std;
//2.策略模式+简单工厂模式：商场打折策略

class CashSuper
{
public:
	virtual double getAcceptCash(double iMoney) = 0;
	~CashSuper(){};
};

class CashNormal :public CashSuper
{
public:
	double getAcceptCash(double iMoney) override
	{
		return iMoney;
	}
};

class CashRebate :public CashSuper
{
public:
	CashRebate(double iRebate) :m_rebate(iRebate){};
	double getAcceptCash(double iMoney) override
	{
		return iMoney*m_rebate;
	}
private:
	double m_rebate;
};

class CashReturn :public CashSuper
{
public:
	CashReturn(double iMoneyCondition, double iMoneyReturn) :m_moneyCondition(iMoneyCondition),
		m_moneyReturn(iMoneyReturn){};
	double getAcceptCash(double iMoney) override
	{
		if (iMoney>=m_moneyCondition)
		{
			iMoney = iMoney - (iMoney/m_moneyCondition)*m_moneyReturn;
		}
		return iMoney;
	}
private:
	double m_moneyCondition;
	double m_moneyReturn;
};

class CashContext
{
public:
	CashContext(string iStr)
	{
		if (iStr == "正常收费")
		{
			m_pCashSuper=new CashNormal();
		}
		else if (iStr == "打一折")
		{
			m_pCashSuper=new CashRebate(0.1);
		}
		else if (iStr == "满300减100")
		{
			m_pCashSuper=new CashReturn(300, 100);
		}
	}
	~CashContext()
	{
		if (m_pCashSuper)
		{
			delete m_pCashSuper;
			m_pCashSuper = NULL;
		}
	}
	double getAcceptCash(double iMoney)
	{
		return m_pCashSuper->getAcceptCash(iMoney);
	}
private:
	CashSuper *m_pCashSuper;
};


int main()
{
	CashContext oCashContext("打一折");
	double acceptMoney = oCashContext.getAcceptCash(800);
	cout << acceptMoney << endl;
	system("pause");
}