Strategy模式C++实现

作用:

定义一系列的算法,把它们一个个封装起来, 并且使它们可相互替换.本模式使得算法可独立于使用它的客户而变化.

UML结构图:

Strategy模式C++实现

实现:

1)Strategy.h

Strategy模式C++实现 ///*********

created: 2006/08/06

filename: Strategy.h

author: 李创

http://www.cppblog.com/converse/

purpose: Strategy模式的演示代码

**********/

#ifndef STRATEGY_H

#defineSTRATEGY_H

classStrategy;

classContext

{

public:

Context(StrategypStrategy);

~Context();

voidContextInterface();

private:

Strategym_pStrategy;

};

classStrategy

{

public:

virtual~Strategy(){}

virtualvoidAlgorithmInterface()=0;

};

classConcreateStrategyA

:publicStrategy

{

public:

virtual~ConcreateStrategyA(){}

virtualvoidAlgorithmInterface();

};

#endif

2)Strategy.cpp

///*********

created: 2006/08/06

filename: Strategy.cpp

author: 李创

http://www.cppblog.com/converse/

purpose: Strategy模式的演示代码

*********/

#include<iostream>

#include"Strategy.h"

Context::Context(StrategypStrategy)

: m_pStrategy(pStrategy)

{

}

Context::~Context()

{

delete m_pStrategy;

m_pStrategy=NULL;

}

voidContext::ContextInterface()

{

if(NULL!=m_pStrategy)

{

m_pStrategy->AlgorithmInterface();

}

}

voidConcreateStrategyA::AlgorithmInterface()

{

std::cout<<"AlgorithmInterface Implemented by ConcreateStrategyA\n";

}

3)Main.cpp

///*********

created: 2006/08/06

filename: Main.cpp

author: 李创

http://www.cppblog.com/converse/

purpose: Strategy模式的测试代码

**********/

#include"Strategy.h"

intmain()

{

StrategypStrategy=newConcreateStrategyA();

ContextpContext=newContext(pStrategy);

Strategy模式C++实现 pContext->ContextInterface();

delete pContext;

return0;

}