学以致用C++设计模式 之 “责任链模式”

#include<iostream>

using namespace std;

//抽象任务类
class abstractRW {
public:
	virtual int get_diff() = 0;	//获取任务等级
	virtual string get_RW() = 0;	//获取任务内容
};

//具体任务类
class RW:public abstractRW{
protected:
	int diff = 0;
	string str = " ";
public:
	RW(int diff, string str) {
		this->diff = diff;
		this->str = str;
	}
	int get_diff() { return this->diff; }	//设置任务等级
	string get_RW() { return this->str; }	//设置任务内容
};

//任务分配类
class handle {
private:
	int level = 5;
	handle* nexthandle;
protected:
	virtual void respon(abstractRW* rw) = 0;
public:
	handle(int l) { this->level = l; }
	void handleMessage(abstractRW* rw) {
		if (rw->get_diff() == this->level)
			this->respon(rw);
		else
		{
			if (this->nexthandle != NULL)
				this->nexthandle->handleMessage(rw);
			else
				cout << "没人接" << endl;
		}
	}
	void setNext(handle* h) { this->nexthandle = h; }
};

class P6 :public handle {
public:
	P6(int lev) :handle(lev){}	//继承写法

	void respon(abstractRW* rw) {
		cout << rw->get_RW() << " P6接了" << endl;
	}
};

class P7 :public handle {
public:
	P7(int lev) :handle(lev) {}

	void respon(abstractRW* rw) {
		cout << rw->get_RW() << " P7接了" << endl;
	}
};

class P8 :public handle {
public:
	void respon(abstractRW* rw) {
		cout << rw->get_RW() << " P8接了" << endl;
	}
};

int main()
{
	abstractRW* rw = new RW(7,"没事儿");
	handle* h6 = new P6(6);
	handle* h7 = new P7(7);

	h6->setNext(h7);

	h6->handleMessage(rw);
	return 0;
}