责任链模式

【1】什么是责任链模式？

责任链模式：

【2】责任链模式的代码示例：

代码示例：

#include<iostream>
#include<string>
using namespace std;

class Request
{
public:
    string requestType;
    string requestContent;
    int number;
};

class Manager
{
protected:
    string name;
    Manager *superior;
public:
    Manager(string name)
    {
        this->name = name;
    }
    void setSuperior(Manager *superior)
    {
        this->superior = superior;
    }
    virtual void requestApplications(Request *request) = 0;
};

class CommonManager : public Manager
{
public:
    CommonManager(string name) : Manager(name)
    {}
    void requestApplications(Request *request)
    {
        if (request->requestType == "请假" && request->number <= 2)
        {
            cout << name << " " << request->requestContent << " 请假天数: " << request->number << " 被批准" << endl;
        }
        else 
        {
            if (superior != NULL)
            {
                superior->requestApplications(request);
            }
        }
    }
};

class Majordomo : public Manager
{
public:
    Majordomo(string name) : Manager(name)
    {}
    void requestApplications(Request *request)
    {
        if (request->requestType == "请假" && request->number <= 5)
        {
            cout << name << " " << request->requestContent << " 请假天数: " << request->number << " 被批准" << endl;
        }
        else 
        {
            if (superior != NULL)
            {
                superior->requestApplications(request);
            }
        }
    }
};


class GeneralManager : public Manager
{
public:
    GeneralManager(string name) : Manager(name)
    {}
    void requestApplications(Request *request)
    {
        if (request->requestType == "请假")
        {
            cout << name << " " << request->requestContent << " 请假天数: " << request->number << " 被批准" << endl;
        }
    }
};

int main()
{
    CommonManager *jingli = new CommonManager("经理"); 
    Majordomo *zongjian = new Majordomo("总监");
    GeneralManager *zongjingli = new GeneralManager("总经理");
    
    jingli->setSuperior(zongjian);
    zongjian->setSuperior(zongjingli);
    
    Request *request = new Request();

    request->requestType = "请假";
    request->requestContent = "李俊宏请假";
    request->number = 1;
    jingli->requestApplications(request);

    request->requestType = "请假";
    request->requestContent = "李俊宏请假";
    request->number = 4;
    jingli->requestApplications(request);

    request->requestType = "请假";
    request->requestContent = "李俊宏请假";
    request->number = 10;
    jingli->requestApplications(request);

    return 0;
}
//Result:
/*
经理 李俊宏请假 请假天数: 1 被批准
总监 李俊宏请假 请假天数: 4 被批准
总经理 李俊宏请假 请假天数: 10 被批准
*/

http://www.cnblogs.com/Braveliu/p/3956793.html