设计模式学习——代理模式（Proxy Pattern）

放假啦~学生们要买车票回家了，有汽车票、火车票，等。但是，车站很远，又要考试，怎么办呢？找代理买啊，虽然要多花点钱，但是，说不定在搞活动，有折扣呢~

  ///
  /// @file    Selling_Tickets.h
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:35:28
  ///

 #ifndef __SELLING_TICKETS_H__
 #define __SELLING_TICKETS_H__

 #include <iostream>

 namespace marrs{

 using std::cout;
 using std::endl;

 class SellingTickets
 {
     public:
         virtual ~SellingTickets(){}

     public:
         virtual void Selling() = ;
         virtual void Price() = ;

 };

 }

 #endif // __SELLING_TICKETS_H__

  ///
  /// @file    Tickets.h
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:39:17
  ///

 #ifndef __TICKETS_H__
 #define __TICKETS_H__

 #include "Selling_Tickets.h"

 namespace marrs{

 class Tickets
 : public SellingTickets
 {

 };

 }

 #endif // __TICKETS_H__

  ///
  /// @file    Bus_Ticket.h
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:41:08
  ///

 #ifndef __BUS_TICKET_H__
 #define __BUS_TICKET_H__

 #include "Tickets.h"

 namespace marrs{

 class BusTicket
 : public Tickets
 {
     public:
         void Selling()
         {
             cout << "selling : BusTicket" << endl;
         }

         void Price()
         {
             cout << "price   : 80 RMB" << endl;
         }
 };

 }

 #endif // __BUS_TICKET_H__

  ///
  /// @file    Train_Ticket.h
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:41:08
  ///

 #ifndef __TRAIN_TICKET_H__
 #define __TRAIN_TICKET_H__

 #include "Tickets.h"

 namespace marrs{

 class TrainTicket
 : public Tickets
 {
     public:
         void Selling()
         {
             cout << "selling : TrainTicket" << endl;
         }

         void Price()
         {
             cout << "price   : 100 RMB" << endl;
         }
 };

 }

 #endif // __TRAIN_TICKET_H__

  ///
  /// @file    Proxy.h
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:46:13
  ///

 #ifndef __PROXY_H__
 #define __PROXY_H__

 #include "Tickets.h"

 namespace marrs{

 class Proxy
 : public SellingTickets
 {
     public:
         Proxy(Tickets * ticket)
         : _ticket(ticket)
         {
         }

         ~Proxy()
         {
             delete _ticket;
         }

     public:
         void Selling()
         {
             _ticket->Selling();
         }

         void Price()
         {
             _ticket->Price();
             Proxy_Price();
             Discount();
         }

     private:
         void Proxy_Price()
         {
             cout << "proxy price : 50 RMB" << endl;
         }

         void Discount()
         {
             cout << "discount    : 50%" << endl;
         }

     private:
         Tickets * _ticket;

 };

 }

 #endif // __PROXY_H__

  ///
  /// @file    Student.cc
  /// @author  marrs(chenchengxi993@gmail.com)
  /// @date    2017-08-13 20:51:42
  ///

 #include "Proxy.h"
 #include "Bus_Ticket.h"
 #include "Train_Ticket.h"

 using namespace marrs;

 int main()
 {
     Proxy * proxy;
     proxy = new Proxy(new BusTicket);
     proxy->Selling();
     proxy->Price();
     delete proxy;

     proxy = new Proxy(new TrainTicket);
     proxy->Selling();
     proxy->Price();
     delete proxy;

     return ;
 }

编译，运行

[ccx@ubuntu ~/object-oriented/Proxy_Pattern]$>g++ * -o Tickets.exe
[ccx@ubuntu ~/object-oriented/Proxy_Pattern]$>./Tickets.exe
selling : BusTicket
price   :  RMB
proxy price :  RMB
discount    : %
selling : TrainTicket
price   :  RMB
proxy price :  RMB
discount    : %