别人的博客再讲策略模式时都会讲三国，策略类就是赵云的锦囊，锦囊里装着若干妙计。在打仗时想要用什么妙计，直接从锦囊里去取。

锦囊类：

class context{public:	context(IStrategy *isstrategy);	~context();	void Operate(void);private:	IStrategy *m_strategy;	};

context::context(IStrategy *isstrategy):m_strategy(isstrategy){}context::~context(){}void context::Operate(void){    m_strategy->Operate();}

妙计的接口：

class IStrategy{public:	IStrategy(void){};	virtual ~IStrategy(void){};	virtual void Operate(void) = 0;};

走后门妙计：

class BackDoor:public IStrategy{public:    BackDoor(void);    ~BackDoor(void);    void Operate(void);};

BackDoor::BackDoor(void){}BackDoor::~BackDoor(void){}void BackDoor::Operate(void){    std::cout <<"走后门了!" <

开绿灯妙计：

class GreenLight:public IStrategy{public:    GreenLight(void);    ~GreenLight(void);    void Operate(void);};

GreenLight::GreenLight(void){}GreenLight::~GreenLight(void){}void GreenLight::Operate(void){    std::cout << "开绿灯了!" << std::endl;}

主函数：

int main(){    std::cout << "#1策略"<
     
      Operate();    std::cout << "#2策略"<
      
       Operate();    getchar();     return 0;}
      
     

运行结果：

#1策略走后门了!#2策略开绿灯了!

 

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