命令模式

  1 #include "stdafx.h"
  2 #include <iostream>
  3 #include <string>
  4 using namespace std;
  5 
  6 // 请求
  7 class Request
  8 {
  9 public:
 10   int m_nNumber;
 11 };
 12 
 13 // 管理者
 14 class Manager
 15 {
 16 public:
 17   Manager(string temp) { name = temp; }
 18   void SetSuccessor(Manager* temp) { manager = temp; }
 19   virtual void GetRequest(Request* request) = 0;
 20 protected:
 21   Manager* manager;
 22   string name;
 23 };
 24 
 25 // 经理
 26 class CommonManager : public Manager
 27 {
 28 public:
 29   CommonManager(string strTemp) : Manager(strTemp) {}
 30   virtual void GetRequest(Request* request)
 31   {
 32     if (request->m_nNumber>=0 && request->m_nNumber<1000)
 33     {
 34       cout << name << " 处理了请求: " << request->m_nNumber << endl;
 35     }
 36     else
 37     {
 38       manager->GetRequest(request);
 39     }
 40   }
 41 };
 42 
 43 // 总监
 44 class Majordomo : public Manager
 45 {
 46 public:
 47   Majordomo(string strTemp) : Manager(strTemp) {}
 48   virtual void GetRequest(Request* request)
 49   {
 50     if (request->m_nNumber <= 5000)
 51     {
 52       cout << name << " 处理了请求: " << request->m_nNumber << endl;
 53     }
 54     else
 55     {
 56       manager->GetRequest(request);
 57     }
 58   }
 59 };
 60 
 61 //总经理  
 62 class GeneralManager: public Manager  
 63 {  
 64 public:  
 65   GeneralManager(string name):Manager(name) {}  
 66   virtual void GetRequest(Request* request)  //总经理可以处理所有请求  
 67   {         
 68     cout << name << " 处理了请求: " << request->m_nNumber << endl;        
 69   }  
 70 };
 71 
 72 int main()
 73 {
 74   Manager* common = new CommonManager("张经理");
 75   Manager* major = new Majordomo("李总监");
 76   GeneralManager* general  = new GeneralManager("赵总");
 77   // common对象的SetSuccessor函数中传递major对象的引用，
 78   // 当common对象能够处理时就处理，不能处理时传递给major对象处理
 79   // 同样majar对象的SetSuccessor函数中传递general对象的引用
 80   // 当majar对象能够处理时就处理，不能处理时传递给general对象处理
 81   common->SetSuccessor(major);
 82   major->SetSuccessor(general);
 83   Request* rq = new Request();
 84 
 85   rq->m_nNumber = 999;
 86   common->GetRequest(rq);
 87 
 88   rq->m_nNumber = 4999;
 89   common->GetRequest(rq);
 90 
 91   rq->m_nNumber = 6999;
 92   common->GetRequest(rq);
 93 
 94   delete rq;
 95   delete major;
 96   delete common;
 97   delete general;
 98 
 99   system("pause");
100   return 0;
101 }