注：爲了簡要說明，類的成員函數均採用inline。
#ifndef _DRIVE_GAME_H_
#define _DRIVE_GAME_H_
#include "DriveGameImpl.h"
#include <iostream>
using std::cout;
using std::endl;
class DriveGame
{
public:
DriveGame(DriveGameImpl* impl):_impl(impl){}
virtual ~DriveGame(){}
virtual void init()
{
cout<<"Init the game."<<endl;
_impl->display();
_impl->flush();
}
virtual void startGame() = 0
{
//Omit for brief description.
}
private:
DriveGameImpl* _impl;
};
class DriveGame_3D:public DriveGame
{
public:
DriveGame_3D(DriveGameImpl* impl):DriveGame(impl)
{
//Omit for brief description.
}
~DriveGame_3D()
{
//To clear the status of the game.
}
virtual void startGame()
{
init();
cout<<"Start 3D Drive Game."<<endl;
}
private:
//Omit for brief description.
};
class DriveGame_2D:public DriveGame
{
public:
DriveGame_2D(DriveGameImpl* impl):DriveGame(impl)
{
//
}
~DriveGame_2D()
{
//To clear the status of the game.
}
virtual void startGame()
{
init();
cout<<"Start 2D Drive Game."<<endl;
}
private:
//Omit for brief description.
};
#endif
#ifndef _DRIVE_GAME_IMPL_H_
#define _DRIVE_GAME_IMPL_H_
#include <iostream>
using std::cout;
using std::endl;
using std::string;
class DriveGameImpl
{
public:
virtual ~DriveGameImpl(){}
virtual void display()=0{}
virtual void flush()=0{}
};
class LinuxDriveGameImpl:public DriveGameImpl
{
public:
~LinuxDriveGameImpl(){}
void display()
{
cout<<"Linux system: display the game."<<endl;
}
void flush()
{
cout<<"Linux system: flush the game."<<endl;
}
};
class WindowsDriveGameImpl:public DriveGameImpl
{
public:
~WindowsDriveGameImpl(){}
void display()
{
cout<<"windows system: display the game."<<endl;
}
void flush()
{
cout<<"windows system: flush the game."<<endl;
}
};
#endif
#include <iostream>
#include "DriveGame.h"
#include "DriveGameImpl.h"
using std::cout;
using std::endl;
using std::string;
int main()
{
DriveGameImpl* linuxGameImpl = new LinuxDriveGameImpl();
DriveGame* game_2D_Linux = new DriveGame_2D(linuxGameImpl);
game_2D_Linux->startGame();
system("PAUSE");
}
