1_strategy(策略模式).doc

設(shè)計(jì)模式C+學(xué)習(xí)筆記之一（Strategy策略模式） 無意中，從網(wǎng)上下到一本電子書24種設(shè)計(jì)模式介紹與6大設(shè)計(jì)原則，很好奇這里有24種設(shè)計(jì)模式，印象中GOF寫的設(shè)計(jì)模式（Design Patterns），好像只有23種吧。運(yùn)行起來一看，還真挺吸引咱的，里面提到的例子都很有趣。很感謝作者寫出這樣好的例子來，我的目的是把作者提到的例子用C+來實(shí)現(xiàn)。寫這本書的作者是：cbf4life，更詳細(xì)的內(nèi)容及說明可以參考原作者博客：。這里只進(jìn)行簡單提示和實(shí)現(xiàn)編碼。1.1.解釋main()，趙云CContext，錦囊IStrategy，策略接口CBackDoor，策略之一CGivenGreenLight，策略之二CBlockEnemy，策略之三說明：一個(gè)策略放到一個(gè)錦囊里。當(dāng)用的時(shí)候，找到這個(gè)錦囊，從錦囊里拿出策略來使用。注意：錦囊只是簡單的裝載和調(diào)用策略，錦囊里沒有邏輯。策略會有更大的自主權(quán)，運(yùn)行更多的邏輯。看代碼：/Context.h#pragma once#include IStrategy.hclass CContextpublic: CContext(IStrategy *pStrategy); CContext(void); void Operate(void);private: IStrategy *m_pStrategy;/Context.cpp#include StdAfx.h#include Context.hCContext:CContext(IStrategy *pStrategy) this-m_pStrategy = pStrategy;CContext:CContext(void) delete this-m_pStrategy;void CContext:Operate(void) this-m_pStrategy-Operate();/IStrategy.h#pragma onceclass IStrategypublic: IStrategy(void); virtual IStrategy(void); virtual void Operate(void) = 0;/BackDoor.h#pragma once#include istrategy.hclass CBackDoor : public IStrategypublic: CBackDoor(void); CBackDoor(void); void Operate(void);/BackDoor.cpp#include StdAfx.h#include BackDoor.h#include using std:cout;using std:endl;CBackDoor:CBackDoor(void)CBackDoor:CBackDoor(void)void CBackDoor:Operate(void) cout 找喬國老幫忙，讓吳國太給孫權(quán)施加壓力 endl;/GivenGreenLight.h#pragma once#include istrategy.hclass CGivenGreenLight : public IStrategypublic: CGivenGreenLight(void); CGivenGreenLight(void); void Operate(void);/GivenGreenList.cpp#include StdAfx.h#include GivenGreenLight.h#include using std:cout;using std:endl;CGivenGreenLight:CGivenGreenLight(void)CGivenGreenLight:CGivenGreenLight(void)void CGivenGreenLight:Operate(void) cout 求吳國太開個(gè)綠燈，放行！ endl;/BlockEnemy.h#pragma once#include istrategy.hclass CBlockEnemy : public IStrategypublic: CBlockEnemy(void); CBlockEnemy(void); void Operate(void);/BlockEnemy.cpp#include StdAfx.h#include BlockEnemy.h#include using std:cout;using std:endl;CBlockEnemy:CBlockEnemy(void)CBlockEnemy:CBlockEnemy(void)void CBlockEnemy:Operate() cout 孫夫人斷后，擋住追兵 endl;/Strategy.cpp#include stdafx.h#include Context.h#include BackDoor.h#include GivenGreenLight.h#include BlockEnemy.h#include using std:cout;using std:endl;int _tmain(int argc, _TCHAR* argv) CContext *pContext; cout 14nnnn17 endl; cout -剛剛到吳國的時(shí)候拆第一個(gè)- Operate(); delete pContext; cout 14nnnn17 endl; cout -劉備樂不思蜀了，拆第二個(gè)了- Operate(); delete pContext; cout 14nnnn17 endl; cout -孫權(quán)的小兵追了，咋辦？拆第三個(gè)- Operate(); delete pContext; _CrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF | _CRTDBG_ALLOC_MEM_DF); _CrtDumpMemoryLeaks(); return 0;一個(gè)錦囊只能裝一個(gè)妙計(jì)，趙云可以有多個(gè)錦囊。屬于對象行為型模式。很簡單的一個(gè)模式了，貌似這24個(gè)里面，這是最簡單的了。也好，先用一個(gè)簡