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([e-mail])

  /// @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([e-mail])

  /// @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([e-mail])

  /// @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([e-mail])

  /// @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([e-mail])

  /// @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([e-mail])

  /// @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    : %