#pragma once
class CSellFruits//定義一個抽象類
{
public:
 CSellFruits(void);
 virtual ~CSellFruits(void);
 virtual void sellapple()=0; //定義接口，賣蘋果
 virtual void sellorange()=0;//定義接口，賣橘子
};
 
#include "SellFruits.h"
CSellFruits::CSellFruits(void)
{
}
 
 
CSellFruits::~CSellFruits(void)
{
}

#pragma once
#include "sellfruits.h"
#include <stdio.h>
class COrchard :
 public CSellFruits
{
public:
 COrchard(void);
 virtual ~COrchard(void);
 virtual void sellapple();
 virtual void sellorange();
};
 
#include "Orchard.h"
COrchard::COrchard(void)
{
}
 
 
COrchard::~COrchard(void)
{
}
 
void COrchard::sellapple()
{
 printf("Sell apple\n");
}
 
void COrchard::sellorange()
{
 printf("Sell orange\n");
}

#pragma once
#include "sellfruits.h"
#include "Orchard.h"
#include <stdio.h>
class CProcySellFruits :
 public CSellFruits
{
public:
 CProcySellFruits(void);
 virtual ~CProcySellFruits(void);
 virtual void sellapple();
 virtual void sellorange();
private:
 CSellFruits *p_SellFruits; //傳入接口對象
};
 
#include "ProcySellFruits.h"
CProcySellFruits::CProcySellFruits(void):p_SellFruits(NULL)
{
}
 
 
CProcySellFruits::~CProcySellFruits(void)
{
}
 
void CProcySellFruits::sellapple()
{
 if(this->p_SellFruits==NULL)
 {
 this->p_SellFruits=new COrchard(); //用被代理的類實例化
 }
 this->p_SellFruits->sellapple();//代理果園賣蘋果
}
 
void CProcySellFruits::sellorange()
{
 if(this->p_SellFruits==NULL)
 {
 this->p_SellFruits=new COrchard(); //用被代理的類實例化
 }
 this->p_SellFruits->sellorange();//代理果園賣橘子
}

CProxySellFruits* p=new CProxySellFruits(); //用代理類賣水果
 p->SellApple();
 p->SellOrange();