大话设计模式C++实现二：策略模式

//个人觉得策略模式与工厂模式很像
#include <string>
#include <math.h>
#include <iostream>
#include <stdlib.h>

class CashSuper
{
public:
	virtual double acceptCash(double money) = 0;
};
class CashNormal :public CashSuper
{
public:
	double acceptCash(double money)
	{
		return money;
	}
};
class CashReturn :public CashSuper
{
private:
	double moneyCondition;
	double moneyReturn;
public:
	CashReturn(double moneyCondition, double moneyReturn)
	{
		this->moneyCondition = moneyCondition;
		this->moneyReturn = moneyReturn;
	}
	double acceptCash(double money)
	{
		double result = money;
		if (moneyCondition)
			result = money - floor(money / moneyCondition)*moneyReturn;
		return result;
	}
};
class CashRebate :public CashSuper
{
private:
	double moneyRebate;
public:
	CashRebate(double moneyRebate)
	{
		this->moneyRebate = moneyRebate;
	}
	double acceptCash(double money)
	{
		return money*moneyRebate;
	}
};
class CashContext
{
private:
	CashSuper* cs;
public:
	CashContext(int type) :cs(NULL)
	{
		switch (type)
		{
		case 1:
		{
			cs = new CashNormal();
			break;
		}
		case 2:
		{
			cs = new CashReturn(300, 100);
			break;
		}
		case 3:
			cs = new CashRebate(0.8);
			break;
		default:;
		}
	}
	~CashContext()
	{
		if (cs != NULL)
		{
			delete cs;
			cs = NULL;
		}
	}
	double GetResult(double money)
	{
		return cs->acceptCash(money);
	}
};

int main()
{
	double total = 0;
	double totalPrice = 0;
	CashContext* cc1 = NULL;
	cc1 = new CashContext(1);
	totalPrice = cc1->GetResult(300);
	total += totalPrice;
	std::cout << "Type:正常收费 totalPrices:" << totalPrice << " total:" << total << std::endl;
	totalPrice = 0;

	CashContext* cc2 = NULL;
	cc2 = new CashContext(2);
	totalPrice = cc1->GetResult(700);
	total += totalPrice;
	std::cout << "Type:满300返100 totalPrices:" << totalPrice << " total:" << total << std::endl;
	totalPrice = 0;

	CashContext* cc3 = NULL;
	cc2 = new CashContext(3);
	totalPrice = cc1->GetResult(300);
	total += totalPrice;
	std::cout << "Type:打八折 totalPrices:" << totalPrice << " total:" << total << std::endl;
	totalPrice = 0;

	if (cc1 != NULL)
	{
		delete cc1;
		cc1 = NULL;
	}
	if (cc2 != NULL)
	{
		delete cc2;
		cc2 = NULL;
	}
	if (cc3 != NULL)
	{
		delete cc3;
		cc3 = NULL;
	}
	return 0;
}