大话设计模式——策略模式（C++实现）

用C++实现了《大话设计模式》中的策略模式（Strategy）

Strategy.h:

#ifndef _STRATEGY_H
#define _STRATEGY_H
#include 
using namespace std;

class CCashBase
{
public:
	virtual double ReturnMoney(double money)=0;
protected:
private:
};

class CCashNomal : public CCashBase
{
public:
	double ReturnMoney(double money);
protected:
private:
};

class CCRebate : public CCashBase
{
public:
	CCRebate(double rebate):m_dMoneyRebate(rebate){};
	double ReturnMoney(double money);
protected:
private:
	double m_dMoneyRebate;
};

class CCReturn : public CCashBase
{
public:
	CCReturn(double moneyCondition,double moneyReturn)
		:m_dMoneyCondition(moneyCondition),m_dMoneyReturn(moneyReturn){};
	double ReturnMoney(double money);
protected:
private:
	double m_dMoneyCondition,m_dMoneyReturn;
};

//策略模式
class CCashContext1
{
public:
	CCashContext1(CCashBase *cb);
	double GetResult(double money);
protected:
private:
	CCashBase *m_pCB;
};

//策略与简单工厂模式结合
class CCashContext2
{
public:
	CCashContext2(int i);
	double GetResult(double money);
protected:
private:
	CCashBase *m_pCB;
};


#endif

Strategy.cpp:

#include "Strategy.h"
/************************************************************************/
/* CCashNomal类                                                         */
/************************************************************************/
double CCashNomal::ReturnMoney( double money )
{
	return money;
}
/************************************************************************/
/* CCRebate类                                                           */
/************************************************************************/
double CCRebate::ReturnMoney( double money )
{
	return money * m_dMoneyRebate;
}
/************************************************************************/
/* CCReturn类                                                           */
/************************************************************************/
double CCReturn::ReturnMoney( double money )
{
	double result = money;
	if (money >= m_dMoneyCondition)
		result = money - int(money/m_dMoneyCondition) * m_dMoneyReturn;
	return result;

}
/************************************************************************/
/* CCashContext1类                                                      */
/************************************************************************/
CCashContext1::CCashContext1( CCashBase *cb )
{
	m_pCB = cb;
}

double CCashContext1::GetResult( double money )
{
	return m_pCB->ReturnMoney(money);
}
/************************************************************************/
/* CCashContext2类                                                      */
/************************************************************************/
CCashContext2::CCashContext2( int i )
{
	switch(i)
	{
	case 1:
		m_pCB = new CCashNomal;
		break;
	case 2:
		m_pCB = new CCReturn(300,100);
		break;
	case 3:
		m_pCB = new CCRebate(0.8);
		break;
	default:
		m_pCB = new CCashNomal;
	}

}

double CCashContext2::GetResult( double money )
{
	return m_pCB->ReturnMoney(money);
}

#include 
#include "Strategy.h"
using namespace std;


int main()
{
	//策略模式	
	CCashContext1 *pCT1 = NULL;
	cout<<"请选择折扣："<>i;
	switch (i)
	{
	case 1:
		pCT1 = new CCashContext1(new CCashNomal);
		break;
	case 2:
		pCT1 = new CCashContext1(new CCReturn(300,100));
		break;
	case 3:
		pCT1 = new CCashContext1(new CCRebate(0.8));
		break;
	default:
		pCT1 = new CCashContext1(new CCashNomal);
	}
	cout<GetResult(500)<GetResult(500)<