设计模式C++学习笔记之十一（Bridge桥梁模式）
桥梁模式，将抽象部分与它的实现部分分离，使它们都可以独立地变化。实现分离的办法就是增加一个类，
11.1.解释
main()，客户
IProduct，产品接口
CHouse，房子
CIPod，ipod
CClothes，服装
CNewCorp，桥梁类，MakeMoney()是桥梁方法
CNewHouseCorp，只能生产房子，所以构造函数是CHouse*
CShanZhaiCorp，什么赚钱就生产什么，所以构造函数是IProduct*
说明：客户直接使用CNewHouseCorp和CShanZhaiCorp类，在main()函数里构造产品，然后传到这两个类里。这两个类的MakeMoney()函数，先调用基类的MakeMoney()，然后分别执行各自的逻辑。
注意：CNewCorp起到了桥梁的作用。可以分别增加产品和公司。
看代码：
//NewCorp.h
#pragma once
#include "IProduct.h"
class CNewCorp
{
public:
CNewCorp(IProduct *pproduct);
virtual ~CNewCorp(void);
void MakeMoney();
private:
IProduct *m_pProduct;
};
//NewCorp.cpp
#include "StdAfx.h"
#include "NewCorp.h"
CNewCorp::CNewCorp( IProduct *pproduct )
{
this->m_pProduct = pproduct;
}
CNewCorp::~CNewCorp(void)
{
}
void CNewCorp::MakeMoney()
{
//每个公司都是一样，先生产
this->m_pProduct->BeProducted();
//然后销售
this->m_pProduct->BeSelled();
}
//NewHouseCorp.h
#pragma once
#include "newcorp.h"
#include "House.h"
class CNewHouseCorp :
public CNewCorp
{
public:
CNewHouseCorp(CHouse *pHouse);
~CNewHouseCorp(void);
void MakeMoney();
};
//NewHouseCorp.cpp
#include "StdAfx.h"
#include "NewHouseCorp.h"
#include <iostream>
using std::cout;
using std::endl;
CNewHouseCorp::CNewHouseCorp(CHouse *pHouse) : CNewCorp(pHouse)
{
}
CNewHouseCorp::~CNewHouseCorp(void)
{
}
void CNewHouseCorp::MakeMoney()
{
this->CNewCorp::MakeMoney();
cout << "房地产公司赚大钱了..." << endl;
}
//ShanZhaiCorp.h
#pragma once
#include "newcorp.h"
#include "IProduct.h"
class CShanZhaiCorp :
public CNewCorp
{
public:
CShanZhaiCorp(IProduct *pproduct);
~CShanZhaiCorp(void);
void MakeMoney();
};
//ShanZhaiCorp.cpp
#include "StdAfx.h"
#include "ShanZhaiCorp.h"
#include <iostream>
using std::cout;
using std::endl;
CShanZhaiCorp::CShanZhaiCorp(IProduct *pproduct) : CNewCorp(pproduct)
{
}
CShanZhaiCorp::~CShanZhaiCorp(void)
{
}
void CShanZhaiCorp::MakeMoney()
{
this->CNewCorp::MakeMoney();
cout << "我赚钱呀..." << endl;
}
//IProduct.h
#pragma once
class IProduct
{
public:
IProduct(void)
{
}
virtual ~IProduct(void)
{
}
virtual void BeProducted() = 0;
virtual void BeSelled() = 0;
};
//House.h
#pragma once
#include "iproduct.h"
class CHouse :
public IProduct
{
public:
CHouse(void);
~CHouse(void);
void BeProducted();
void BeSelled();
};
//House.cpp
#include "StdAfx.h"
#include "House.h"
#include <iostream>
using std::cout;
using std::endl;
CHouse::CHouse(void)
{
}
CHouse::~CHouse(void)
{
}
void CHouse::BeProducted()
{
cout << "生产出的房子是这个样子的..." << endl;
}
void CHouse::BeSelled()
{
cout << "生产出的房子卖出去了..." << endl;
}
//Clothes.h
#pragma once
#include "iproduct.h"
class CClothes :
public IProduct
{
public:
CClothes(void);
~CClothes(void);
void BeProducted();
void BeSelled();
};
//Clothes.cpp
#include "StdAfx.h"
#include "Clothes.h"
#include <iostream>
using std::cout;
using std::endl;
CClothes::CClothes(void)
{
}
CClothes::~CClothes(void)
{
}
void CClothes::BeProducted()
{
cout << "生产出的衣服是这个样子的..." << endl;
}
void CClothes::BeSelled()
{
cout << "生产出的衣服卖出去了..." << endl;
}
//IPod.h
#pragma once
#include "iproduct.h"
class CIPod :
public IProduct
{
public:
CIPod(void);
~CIPod(void);
void BeProducted();
void BeSelled();
};
//IPod.cpp
#include "StdAfx.h"
#include "IPod.h"
#include <iostream>
using std::cout;
using std::endl;
CIPod::CIPod(void)
{
}
CIPod::~CIPod(void)
{
}
void CIPod::BeProducted()
{
cout << "生产出的ipod是这个样子的..." << endl;
}
void CIPod::BeSelled()
{
cout << "生产出的ipod卖出去了..." << endl;
}
//
// Bridge.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "ClothesCorp.h"
#include "NewHouseCorp.h"
#include "Clothes.h"
#include "IPod.h"
#include "ShanZhaiCorp.h"
#include <iostream>
using std::cout;
using std::endl;
void DoNewRun1()
{
cout << "----------房地产公司是这样运行的----------" << endl;
CHouse house;
CNewHouseCorp newHouseCorp(&house);
newHouseCorp.MakeMoney();
cout << endl;
cout << "----------山寨公司是这样运行的----------" << endl;
CClothes clothes;
CShanZhaiCorp shanZhaiCorp(&clothes);
shanZhaiCorp.MakeMoney();
cout << endl;
}
void DoNewRun2()
{
cout << "----------房地产公司是这样运行的----------" << endl;
CHouse house;
CNewHouseCorp newHouseCorp(&house);
newHouseCorp.MakeMoney();
cout << endl;
cout << "----------山寨公司是这样运行的----------" << endl;
CIPod ipod;
CShanZhaiCorp shanZhaiCorp(&ipod);
shanZhaiCorp.MakeMoney();
cout << endl;
}
int _tmain(int argc, _TCHAR* argv[])
{
//只有两家公司，一家是房地产公司，另一家公司是衣服赚钱就生产衣服
DoNewRun1();
//只有两家公司，一家是房地产公司，另一家公司是ipod赚钱就生产ipod
DoNewRun2();
_CrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF | _CRTDBG_ALLOC_MEM_DF);
_CrtDumpMemoryLeaks();
return 0;
}
桥梁模式（又可以称做桥接模式）属于结构型模式。CNewCorp实现了桥梁（桥接）的作用。
