设计模式——职责链模式（C++实现）

　

#include <iostream>
#include <string>

using namespace std;


class Handler
{
public:
        Handler(Handler* pstHandler): m_pstHandler(pstHandler)
        {

        }

        virtual void HandleRequest(int request) = 0;

protected:
        Handler* m_pstHandler;
};

class ConcreteHandler1: public Handler
{
public:
        ConcreteHandler1(Handler* pstHandler): Handler(pstHandler)
        {

        }

        virtual void HandleRequest(int request)
        {
                if (request < 7)
                {
                        cout<< "组长：批假"<< request<< "天"<< endl;
                }
                else
                {
                        m_pstHandler->HandleRequest(request);
                }
        }
};

class ConcreteHandler2: public Handler
{
public:
        ConcreteHandler2(Handler* pstHandler): Handler(pstHandler)
        {

        }

        virtual void HandleRequest(int request)
        {
                if (request < 15)
                {
                        cout<< "总监：批假"<< request<< "天"<< endl;
                }
                else
                {
                        m_pstHandler->HandleRequest(request);
                }
        }
};

class ConcreteHandler3: public Handler
{
public:
        ConcreteHandler3(Handler* pstHandler): Handler(pstHandler)
        {

        }

        virtual void HandleRequest(int request)
        {
                if (request < 30)
                {
                        cout<< "经理：批假"<< request<< "天"<< endl;
                }
                else
                {
                        cout<< "经理："<< request<< "天，时间太长，超过公司规定"<< endl;
                }
        }
};

int main(int argc, char* argv[])
{
        Handler* jingli = new ConcreteHandler3(NULL);
        Handler* zongjian = new ConcreteHandler2(jingli);
        Handler* zuzhang = new ConcreteHandler1(zongjian);

        zuzhang->HandleRequest(12);
        zuzhang->HandleRequest(15);
        zuzhang->HandleRequest(5);
        zuzhang->HandleRequest(31);

        delete jingli;
        delete zongjian;
        delete zuzhang;

        return 0;
}
//////////////////////////////////
[root@ ~/learn_code/design_pattern/20_chain]$ ./chain               
总监：批假12天
经理：批假15天
组长：批假5天
经理：31天，时间太长，超过公司规定