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职责链模式

定义：使得多个对象都有机会处理请求，从而避免请求的发送者和接受者之间的耦合关系，将这个对象连成一条链，并沿着该链传递该请求，直到有一个对象处理它为止。

属于行为型模式。

代码：

#include 
   
    using namespace std;class Handle{public:	void setHandle(Handle *h)	{		m_handle = h;	}	virtual void handleRequest(int score) = 0;	Handle *m_handle;};class ConcreteHandleA :public Handle{public:	void handleRequest(int score)	{		if (score < 60)		{			cout << score << " 不及格，调入普通班级" << endl;		}		else		{			if (m_handle)				m_handle->handleRequest(score);		}	}};class ConcreteHandleB :public Handle{public:	void handleRequest(int score)	{		if (score >= 60 && score<80)		{			cout << score << " 及格，调入良好班级" << endl;		}		else		{			if (m_handle)				m_handle->handleRequest(score);		}	}};class ConcreteHandleC :public Handle{public:	void handleRequest(int score)	{		if (score >= 90)		{			cout << score << " 优秀，调入尖子班" << endl;		}	}};//客户端int main(){	ConcreteHandleA *a = new ConcreteHandleA;	ConcreteHandleB *b = new ConcreteHandleB;	ConcreteHandleC *c = new ConcreteHandleC;	a->setHandle(b);	b->setHandle(c);	int stuScore[] = { 30, 10, 80, 90, 99, 75, 49 };	for (int x : stuScore)	{		a->handleRequest(x);	}	if (a)	{		delete a;		a = nullptr;	}	if (b)	{		delete b;		b = nullptr;	}	if (c)	{		delete c;		c = nullptr;	}}
   

效果：

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