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) = ;

 protected:
         Handler* m_pstHandler;
 };

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

         }

         virtual void HandleRequest(int request)
         {
                 if (request < )
                 {
                         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 < )
                 {
                         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 < )
                 {
                         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();
         zuzhang->HandleRequest();
         zuzhang->HandleRequest();
         zuzhang->HandleRequest();

         delete jingli;
         delete zongjian;
         delete zuzhang;

         return ;
 }
 //////////////////////////////////
 [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