The Network.hpp File

 // Network.hpp: The header file for the network implementation  // class. While not a first-class citizen in this design (i.e., a key // abstraction), it is a very important implementation class. This // class is a basic wrapper for the physical network, whatever it // happens to be (a pipe, sockets, a LAN, a WAN, a telephone, two // soup cans). The data of the Network class can be filled in with the // reader's favorite mechanism. The methods of the class clearly // state where a send buffer or receive buffer needs to be placed. // This code has a simulation so that both sides of the application // can be tested. #ifndef _NETWORK_ #define _NETWORK_ #include <iostream.h> #include <stdlib.h> #include <string.h> #include ''consts.hpp'' #define BANK_SIDE class Transaction; class Network { // The user's favorite byte-transmission method goes here. See the // implementation of the four methods to determine where the send // and receives for this method need to go. public: #ifdef ATM_SIDE    int send(Transaction* t);    int receive(int& status, char* buf); #endif #ifdef BANK_SIDE    Transaction* receive();    void send(int status, Transaction* t); #endif }; #endif