设计模式 Design Parttern ——命令模式Command

设计模式 Design Parttern ——命令模式Command

http://blog.csdn.net/leeidea/

1:头文件

 

#ifndef _COMMAND_H_VANEY_#define _COMMAND_H_VANEY_#include <iostream>using namespace std;/******************************************************************名称 ：Command.h版本 ：1.00描述 ：演示命令模式的概念作者 ：[e-mail] http://blog.csdn.net/leeidea日期 ：2010年10月22日版权 ：[e-mail] http://blog.csdn.net/leeide******************************************************************//*官方解释：The Command pattern allows requests to be encapsulated as objects, thereby allowing clients to be parameterized with different requests.我的理解：命令模式由三大部分组成，命令组，调用者，响应者，调用者不直接操作响应者，调用 可以合理的组织命令队列，然后执行该队列*///响应者class CReceiver{public:CReceiver(){cout << "CReceiver()" << endl;}virtual ~CReceiver(){cout << "~CReceiver()" << endl;}public://需要子类实现的方法virtual void DO1(){cout << "CReceiver DO1()" << endl;}virtual void DO2(){ cout << "CReceiver DO2()" << endl;}virtual void DO3(){cout << "CReceiver DO3()" << endl;}};//抽象命令class CCommand{public:CCommand(CReceiver* rcver){m_rcver = rcver;cout << "CCommand()" << endl;}virtual ~CCommand(){if(m_rcver)delete m_rcver;m_rcver = 0;cout << "~CCommand()" << endl;}public://需要子类实现的方法virtual void Execute() = 0;protected:CReceiver* m_rcver;};//命令1 执行接受者的DO1行为class CCommand1 : public CCommand{public:CCommand1(CReceiver* rcver):CCommand(rcver){cout << "CCommand1()" << endl;}virtual ~CCommand1(){if(m_rcver)delete m_rcver;m_rcver = 0;cout << "~CCommand1()" << endl;}public://需要子类实现的方法virtual void Execute(){if(m_rcver)m_rcver->DO1();cout << "CCommand1 DO1()" << endl;}};//命令2 执行接受者的DO2行为class CCommand2 : public CCommand{public:CCommand2(CReceiver* rcver):CCommand(rcver){cout << "CCommand1()" << endl;}virtual ~CCommand2(){if(m_rcver)delete m_rcver;m_rcver = 0;cout << "~CCommand2()" << endl;}public://需要子类实现的方法virtual void Execute(){if(m_rcver)m_rcver->DO2();cout << "CCommand2 DO2()" << endl;}};//使用者#define CMD_NUMS 10class CUser{CCommand *_cmds[CMD_NUMS];int index;public:CUser():index(0){cout << "CUser()" << endl;}virtual ~CUser(){for(int i = 0; i < index; i++){delete _cmds[i];}cout << "~CUser()" << endl;}public:void SetCommand(CCommand* cmd){if(index < CMD_NUMS)_cmds[index++] = cmd;}void Execute(){if(index){for(int i = 0; i < index; i++){_cmds[i]->Execute();}}}};#define C_API extern "C"//用户C_API int UsingCM();#endif

 

2:源文件

 

#include "Command.h"C_API int UsingCM(){//创建接受者CReceiver* rever = new CReceiver();//创建具体命令CCommand1* cmd1 = new CCommand1(rever);CCommand2* cmd2 = new CCommand2(rever);//创建用户CUser* user = new CUser();//创建命令列表user->SetCommand(cmd1);user->SetCommand(cmd2);//执行user->Execute();return 1;}

 

 

3:用户文件main.c

 

extern int UsingCM();//系统默认入口int _tmain(int argc, _TCHAR* argv[]){ return UsingCM();}