(一)策略模式C++

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main()，赵云

CContext，锦囊

IStrategy，策略接口

CBackDoor，策略之一

CGivenGreenLight，策略之二

CBlockEnemy，策略之三

说明：一个策略放到一个锦囊里。当用的时候，找到这个锦囊，从锦囊里拿出策略来使用。

注意：锦囊只是简单的装载和调用策略，锦囊里没有逻辑。策略会有更大的自主权，运行更多的逻辑

//Strategy.h

#ifndef STRATEGY_H_#define STRATEGY_H_class Strategy{public:Strategy();~Strategy();virtual void Operate() = 0;};class BackDoor:public Strategy{public:BackDoor();~BackDoor();void Operate();};class GivenGreenLight:public Strategy{public:GivenGreenLight();~GivenGreenLight();void Operate();};class BlockEnemy:public Strategy{public:BlockEnemy();~BlockEnemy();void Operate();};#endif

//Strategy.cpp

#include "Strategy.h"#include <iostream>using namespace std;Strategy::Strategy() {}Strategy::~Strategy() {}BackDoor::BackDoor() {}BackDoor::~BackDoor() {}void BackDoor::Operate(){cout<<"找叫人帮忙，给孙权施压"<<endl;}GivenGreenLight::GivenGreenLight() {}GivenGreenLight::~GivenGreenLight() {}void GivenGreenLight::Operate(){cout<<"求吴国开个绿灯，放行"<<endl;}BlockEnemy::BlockEnemy() {}BlockEnemy::~BlockEnemy() {}void BlockEnemy::Operate(){cout<<"孙夫人断后，阻挡追兵"<<endl;}

//Context.h

#ifndef CONTEXT_H_#define CONTEXT_H_#include "Strategy.h"class Context{public:Context(Strategy *pStrategy);~Context();void Operate();private:Strategy *m_pStrategy;};#endif

//Context.cpp

#include "Context.h"#include <iostream>using namespace std;Context::Context(Strategy *pStrategy){m_pStrategy = pStrategy;}Context::~Context(){delete this->m_pStrategy;}void Context::Operate(){this->m_pStrategy->Operate();}

//main.cpp

#include <iostream>#include <stdlib.h>#include "Strategy.h"#include "Context.h"using namespace std;int main(){Context *pContext;cout<<"------刚到吴国请拆第一个锦囊-------"<<endl;pContext = new Context(new BackDoor());pContext->Operate();delete pContext;cout<<"-----刘备不思蜀，就要拆第二个------"<<endl;pContext = new Context(new GivenGreenLight());pContext->Operate();delete pContext;cout<<"------孙权的追兵来了，就拆第三个------"<<endl;pContext = new Context(new BlockEnemy());pContext->Operate();delete pContext;return 0;}

相对来说这个是比较好理解的例子

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