C++设计模式-桥接模式

目录

 

 

基本概念

代码与实例

---

 

基本概念

组合/聚合的好处：优先使用对象的组合/聚合将有助于你保持每个类被封装，并被集中在单个任务上。这样类和类的继承层次会保持较小规模，并且不太可能增长为不可控制的庞然大物。

桥接模式（Bridge），将抽象部分与实现部分分离，使它们都可以独立的变化。

桥接模式的核心意图就是把这些实现对立出来，让它们各自变化。这就使得每一种实现的变化不会影响其他实习。

UML图如下（来源大话设计模式）

 

代码与实例

程序运行截图如下：

源码如下：

Head.h

#ifndef HEAD_H
#define HEAD_H

#include <list>
#include <string>
#include <iostream>
using namespace std;


//手机软件
class HandSetSoft{

public:
	virtual void run();
	virtual ~HandSetSoft();

protected:
	HandSetSoft();
	HandSetSoft(HandSetSoft &h);
	HandSetSoft &operator = (HandSetSoft &t);
	string m_name;
};

//手机游戏
class HandSetGame : public HandSetSoft{

public:
	HandSetGame(const string &name);
	~HandSetGame();
	void run();
};

//手机通讯录
class HandSetAddressList: public HandSetSoft{

public:
	HandSetAddressList(const string &name);
	~HandSetAddressList();
	void run();
};

//手机品牌
class HandSetBrand{

public:
	void addHandSetSoft(HandSetSoft *h);
	virtual void run();
	virtual ~HandSetBrand();

protected:
	HandSetBrand();
	HandSetBrand(HandSetBrand &h);
	HandSetBrand &operator = (HandSetBrand &t);

	list<HandSetSoft*> m_soft;
};


//手机品牌N
class HandSetBrandN: public HandSetBrand{

public:
	~HandSetBrandN();
	void run();
};


//手机品牌M
class HandSetBrandM: public HandSetBrand{

public:
	~HandSetBrandM();
	void run();
};

#endif

Head.cpp

#include "Head.h"

void HandSetSoft::run()
{

}

HandSetSoft::HandSetSoft()
{

}

HandSetSoft::HandSetSoft(HandSetSoft &h)
{

}

HandSetSoft::~HandSetSoft()
{
	cout << "HandSetSoft::~HandSetSoft()" << endl;
}

HandSetSoft& HandSetSoft::operator=(HandSetSoft &t)
{
	return HandSetSoft();
}

HandSetGame::HandSetGame(const string &name)
{
	m_name = name;
}

HandSetGame::~HandSetGame()
{
	cout << "HandSetGame::~HandSetGame()" << endl;
}

void HandSetGame::run()
{
	cout << "运行手机游戏 ---- " << m_name << endl;
}


HandSetAddressList::HandSetAddressList(const string &name)
{
	m_name = name;
}

HandSetAddressList::~HandSetAddressList()
{
	cout << "HandSetAddressList::~HandSetAddressList()" << endl;
}

void HandSetAddressList::run()
{
	cout << "运行手机通讯录 ---- " << m_name << endl;
}

void HandSetBrand::addHandSetSoft(HandSetSoft *h)
{
	m_soft.push_back(h);
}

void HandSetBrand::run()
{

}

HandSetBrand::HandSetBrand()
{

}

HandSetBrand::HandSetBrand(HandSetBrand &h)
{

}

HandSetBrand::~HandSetBrand()
{
	cout << "HandSetBrand::~HandSetBrand()" << endl;
}

HandSetBrand & HandSetBrand::operator=(HandSetBrand &t)
{
	return HandSetBrand();
}

HandSetBrandN::~HandSetBrandN()
{
	cout << "HandSetBrandN::~HandSetBrandN()" << endl;
	for(list<HandSetSoft*>::iterator i = m_soft.begin(); i != m_soft.end(); i++){

		delete (*i);
	}
	m_soft.clear();
}

void HandSetBrandN::run()
{
	for(list<HandSetSoft*>::iterator i = m_soft.begin(); i != m_soft.end(); i++){

		(*i)->run();
	}
}

HandSetBrandM::~HandSetBrandM()
{
	cout << "HandSetBrandM::~HandSetBrandM()" << endl;
	for(list<HandSetSoft*>::iterator i = m_soft.begin(); i != m_soft.end(); i++){

		delete (*i);
	}
	m_soft.clear();
}

void HandSetBrandM::run()
{
	for(list<HandSetSoft*>::iterator i = m_soft.begin(); i != m_soft.end(); i++){

		(*i)->run();
	}
}

main.cpp

#include "Head.h"

int main(int *argc, int *argv){

	HandSetBrand *band1 = new HandSetBrandN;
	band1->addHandSetSoft(new HandSetGame("王者荣耀"));
	band1->addHandSetSoft(new HandSetGame("吃鸡"));
	band1->addHandSetSoft(new HandSetGame("赛尔号"));
	band1->addHandSetSoft(new HandSetAddressList("流氓公司出的"));
	band1->addHandSetSoft(new HandSetAddressList("好用的软件"));
	band1->run();
	delete band1;

	cout << endl << "---------------华丽的分割线---------------" << endl << endl;

	HandSetBrand *band2 = new HandSetBrandM;
	band2->addHandSetSoft(new HandSetGame("QQ飞车"));
	band2->addHandSetSoft(new HandSetAddressList("流氓公司的"));
	band2->run();
	delete band2;

	getchar();
	return 0;
}