设计模式学习——代理模式(Proxy Pattern)
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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~
1 /// 2 /// @file Selling_Tickets.h 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:35:28 5 /// 6 7 #ifndef __SELLING_TICKETS_H__ 8 #define __SELLING_TICKETS_H__ 9 10 #include <iostream> 11 12 namespace marrs{ 13 14 using std::cout; 15 using std::endl; 16 17 class SellingTickets 18 { 19 public: 20 virtual ~SellingTickets(){} 21 22 public: 23 virtual void Selling() = 0; 24 virtual void Price() = 0; 25 26 }; 27 28 } 29 30 #endif // __SELLING_TICKETS_H__
1 /// 2 /// @file Tickets.h 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:39:17 5 /// 6 7 #ifndef __TICKETS_H__ 8 #define __TICKETS_H__ 9 10 #include "Selling_Tickets.h" 11 12 namespace marrs{ 13 14 class Tickets 15 : public SellingTickets 16 { 17 18 }; 19 20 } 21 22 #endif // __TICKETS_H__
1 /// 2 /// @file Bus_Ticket.h 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:41:08 5 /// 6 7 #ifndef __BUS_TICKET_H__ 8 #define __BUS_TICKET_H__ 9 10 #include "Tickets.h" 11 12 namespace marrs{ 13 14 class BusTicket 15 : public Tickets 16 { 17 public: 18 void Selling() 19 { 20 cout << "selling : BusTicket" << endl; 21 } 22 23 void Price() 24 { 25 cout << "price : 80 RMB" << endl; 26 } 27 }; 28 29 } 30 31 #endif // __BUS_TICKET_H__
1 /// 2 /// @file Train_Ticket.h 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:41:08 5 /// 6 7 #ifndef __TRAIN_TICKET_H__ 8 #define __TRAIN_TICKET_H__ 9 10 #include "Tickets.h" 11 12 namespace marrs{ 13 14 class TrainTicket 15 : public Tickets 16 { 17 public: 18 void Selling() 19 { 20 cout << "selling : TrainTicket" << endl; 21 } 22 23 void Price() 24 { 25 cout << "price : 100 RMB" << endl; 26 } 27 }; 28 29 } 30 31 #endif // __TRAIN_TICKET_H__
1 /// 2 /// @file Proxy.h 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:46:13 5 /// 6 7 #ifndef __PROXY_H__ 8 #define __PROXY_H__ 9 10 #include "Tickets.h" 11 12 namespace marrs{ 13 14 class Proxy 15 : public SellingTickets 16 { 17 public: 18 Proxy(Tickets * ticket) 19 : _ticket(ticket) 20 { 21 } 22 23 ~Proxy() 24 { 25 delete _ticket; 26 } 27 28 public: 29 void Selling() 30 { 31 _ticket->Selling(); 32 } 33 34 void Price() 35 { 36 _ticket->Price(); 37 Proxy_Price(); 38 Discount(); 39 } 40 41 private: 42 void Proxy_Price() 43 { 44 cout << "proxy price : 50 RMB" << endl; 45 } 46 47 void Discount() 48 { 49 cout << "discount : 50%" << endl; 50 } 51 52 private: 53 Tickets * _ticket; 54 55 }; 56 57 } 58 59 #endif // __PROXY_H__
1 /// 2 /// @file Student.cc 3 /// @author marrs(chenchengxi993@gmail.com) 4 /// @date 2017-08-13 20:51:42 5 /// 6 7 #include "Proxy.h" 8 #include "Bus_Ticket.h" 9 #include "Train_Ticket.h" 10 11 using namespace marrs; 12 13 int main() 14 { 15 Proxy * proxy; 16 proxy = new Proxy(new BusTicket); 17 proxy->Selling(); 18 proxy->Price(); 19 delete proxy; 20 21 proxy = new Proxy(new TrainTicket); 22 proxy->Selling(); 23 proxy->Price(); 24 delete proxy; 25 26 return 0; 27 }
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 : 80 RMB proxy price : 50 RMB discount : 50% selling : TrainTicket price : 100 RMB proxy price : 50 RMB discount : 50%
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