C++编程模式2--策略模式

2019-11-06 09:13:37

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本博参考了这篇博客 http://www.cnblogs.com/wanggary/archive/2011/04/07/2008796.html ~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~ 使用策略的类（CUseStrategy）抽象策略类（CAbsStrategy）

策略类1（CStrategy1）策略类2（CStrategy2）策略类3（CStrategy3）。。。这些类之间的关系是： 1、所有的策略类由（使用策略的类UseStrategy）调用。 2、所有的策略类继承自（抽象策略类AbsStrategy）。 3、抽象策略类的对象，作为使用策略类的对象成员。

//UseStrategy.h 文件//使用策略的类#PRagma once#include "AbsStrategy.h"//包含抽象策略类的头文件class CUseStrategy{public: CUseStrategy(IStrategy *pStrategy); ~CUseStrategy(void); void Operate(void);private: CAbsStrategy*m_pStrategy;};//UseStrategy.cpp#include "StdAfx.h"#include "UseStrategy.h"CUseStrategy::CUseStrategy(CAbsStrategy*pStrategy){ this->m_pStrategy = pStrategy;}CUseStrategy::~CUseStrategy(void){ delete this->m_pStrategy;}void CUseStrategy::Operate(void){ this->m_pStrategy->Operate();}//AbsStrategy.h #pragma once//抽象策略类文件Class CAbstrategy{Public: CAbstrategy(); virtual~CAbstrategy(); virtual void operate()=0;//纯虚函数。};//Strategy1.h文件//策略1#pragma once#include "Abstrategy.h"class CStrategy1 :public CAbstraegy{public: CStrategy1(); ~CStrategy1(); void operate();};//Strategy1.cpp文件#include "StdAfx.h"#include "Strategy1.h"#include <iostream>using std::cout;using std::endl;Strategy1::Strategy1(void){}Strategy1::~Strategy1(void){}void Strategy1::operate(void){ cout << "这是策略1！" << endl;}//Strategy2.h文件//策略1#pragma once#include "Abstrategy.h"class CStrategy2 :public CAbstraegy{public: CStrategy2(); ~CStrategy2(); void operate();};//Strategy2.cpp文件#include "StdAfx.h"#include "Strategy2.h"#include <iostream>using std::cout;using std::endl;Strategy2::Strategy2(void){}Strategy2::~Strategy2(void){}void Strategy2::operate(void){ cout << "这是策略2！" << endl;}//Strategy3.h文件//策略3#pragma once#include "Abstrategy.h"class CStrategy3 :public CAbstraegy{public: CStrategy3(); ~CStrategy3(); void operate();};//Strategy3.cpp文件#include "StdAfx.h"#include "Strategy3.h"#include <iostream>using std::cout;using std::endl;Strategy3::Strategy3(void){}Strategy3::~Strategy3(void){}void Strategy3::operate(void){ cout << "这是策略3！" << endl;}

========================================================== 见证奇迹的时刻 =========================================================

#include"UseStrategy.h"#include "Abstrategy.h"#include "Strategy1.h"#include "Strategy2.h"#include "Strategy3.h"int main(){ CUseStrategy*pUseStrategy; //使用第一个策略 pUseStrategy=new(new CStrategy1()); pUseStrategy->operate(); delete pUseStrategy; //使用第二个策略 pUseStrategy=new(new CStrategy2()); pUseStrategy->operate(); delete pUseStrategy; //使用第三个策略 pUseStrategy=new(new CStrategy3()); pUseStrategy->operate(); delete pUseStrategy;}

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