设计模式之职责链（C++实例代码）

本文链接：https://blog.youkuaiyun.com/u010889285/article/details/13627829

本文通过一个具体的C++代码示例介绍了责任链模式的应用。该模式定义了一个处理请求的接收者对象链，使得多个对象都有机会处理请求，从而避免请求的发送者与接收者之间的耦合关系。

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 #include <iostream>
#include <string>
using namespace std;
class requirement
{
public:
    requirement(requirement* _rq,int _level)
        :rq(_rq),level(_level)
    {
    }
    //virtual setLevel(requirement* rq, int level);
    virtual bool isMe(int _curlevel)
    {
        if(level == _curlevel)
            return true;
        else
            return false;
    }
    virtual void  handle(int _curlevel)
    {
       
            if(isMe(_curlevel))
            {
                showmsg();
            }
            else
            {
                cout<<"up."<<endl;
                rq->handle(_curlevel);
            }
    }
    virtual void showmsg()
    {
        cout<<"rq."<<endl;
    }
    protected:
    requirement* rq;
    int level;
};

class PM : public requirement
{
public:
    PM(requirement* _rq, int _level)
        :requirement(_rq, _level)
    {
    }   
    virtual void showmsg()
    {
        cout<<"PM."<<endl;
    }
};
class TL : public requirement
{
    public:
    TL(requirement* _rq, int _level)
        :requirement(_rq, _level)
    {
    }   
    virtual void showmsg()
    {
        cout<<"TL."<<endl;
    }
};
class SE : public requirement
{
public:
    SE(requirement* _rq, int _level)
        :requirement(_rq, _level)
    {
    }
    virtual void showmsg()
    {
        cout<<"SE."<<endl;
    }
};
class Programmer : public requirement
{
public:
    Programmer(requirement* _rq, int _level)
        :requirement(_rq, _level)
    {
    }    
    virtual void showmsg()
    {
        cout<<"Programmer."<<endl;
    }
};

int main(void)
{
    requirement* onerq = new requirement(NULL,0);
    requirement* pm = new PM(onerq,1);
    requirement* tl = new TL(pm,2);
    requirement* se = new SE(tl,3);
    requirement* programmer = new Programmer(se,4);
    programmer->handle(0);
    getchar();
    return 1;
}