Factory Design Pattern

From:
mail.dpant@gmail.com
Newsgroups:
comp.lang.c++.moderated
Date:
Thu, 18 Sep 2008 14:21:59 CST
Message-ID:
<918c7ac8-f418-4152-8da3-f9a4e80dd6a8@a8g2000prf.googlegroups.com>
I have written a Factory design Patten in C++. can anybody comment is
it the correct way to do it?

#include "stdafx.h"
#include <iostream>
using namespace std;

/* Display Driver hierarchy */
class DisplayDriver{
public:
    DisplayDriver(){}
    virtual void display()=0;
};

class LowResolutionDD:public DisplayDriver{
public:
    void display(){
        cout<<"LowResolutionDD"<<endl;
    }
};
class HighResolutionDD:public DisplayDriver{
public:
    void display(){
        cout<<"HighResolutionDD"<<endl;
    }
};

/* Print Driver Hierarchy */

class PrintDriver{
public:
     PrintDriver(){}
     virtual void print(){}
};

class LowResolutionPD:public PrintDriver{
public:
    void print(){
        cout<<"LowResolutionPD"<<endl;
    }
};
class HighResolutionPD:public PrintDriver{
public:
    void print(){
        cout<<"HighResolutionPD"<<endl;
    }
};
/* abstract factory */
class AbsFactory{

public:
    virtual DisplayDriver* CreateDisplayDriver()=0;
    virtual PrintDriver* CreatePrintDriver()=0;

};
/* Concrete factory1 */
class ConcreteFactory1: public AbsFactory{
public:
    DisplayDriver* CreateDisplayDriver(){ return new HighResolutionDD; }
    PrintDriver* CreatePrintDriver(){return new HighResolutionPD; }
};

/* Concrete factory2 */
class ConcreteFactory2: public AbsFactory{
public:
    DisplayDriver* CreateDisplayDriver(){ return new LowResolutionDD; }
    PrintDriver* CreatePrintDriver(){return new LowResolutionPD; }
};

int main(int argc, _TCHAR* argv[])
{
    AbsFactory *factobj;
    factobj = new ConcreteFactory2;
    factobj->CreateDisplayDriver()->display();
    factobj->CreatePrintDriver()->print();

}

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