Design-Patterns/AbstractFactory.cpp at master · Treitork/Design-Patterns · GitHub

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ABSTRACT FACTORY PATTERN VS FACTORY METHOD
What's the difference between Abstract Factory Pattern and Factory Method?

Abstract Factory design pattern creates Factory.
Factory design pattern creates Products.


#include <iostream>

class Button
{
public:
	virtual void paint() = 0;
};

class WinButton : public Button
{
public:
	void paint (){
		std::cout << " Window Button \n";
       }
};

class MacButton : public Button
{
public:
	void paint (){
		std::cout << " Mac Button \n";
       }
};

class ScrollBar
{
public:
	virtual void paint() = 0;
};

class WinScrollBar : public ScrollBar
{
public:
	void paint (){
		std::cout << " Window ScrollBar \n";
       }
};

class MacScrollBar : public ScrollBar {
public:

	void paint (){
		std::cout << " Mac ScrollBar \n";
       }
};


class GUIFactory
{
public:
	virtual Button* createButton () = 0;
	virtual ScrollBar* createScrollBar () = 0;
};

class WinFactory : public GUIFactory
{
public:
	Button* createButton (){
		return new WinButton;
	}
	ScrollBar* createScrollBar (){
		return new WinScrollBar;
	}
};

class MacFactory : public GUIFactory
{
public:
	Button* createButton (){
		return new MacButton;
	}
	ScrollBar* createScrollBar (){
		return new MacScrollBar;
	}
};

int main()
{
	GUIFactory* guiFactory;
	Button *btn;
	ScrollBar *sb;

	guiFactory = new MacFactory;
	btn = guiFactory->createButton();
	btn -> paint();
	sb = guiFactory->createScrollBar();
	sb -> paint();

	guiFactory = new WinFactory;
	btn = guiFactory->createButton();
	btn -> paint();
	sb = guiFactory->createScrollBar();
	sb -> paint();

	return 0;
}


Now if we add iPhone factory also we make minimal change in code
#include <iostream>

class Button
{
public:
	virtual void paint() = 0;
};

class WinButton : public Button
{
public:
	void paint (){
		std::cout << " Window Button \n";
       }
};

class MacButton : public Button
{
public:
	void paint (){
		std::cout << " Mac Button \n";
       }
};

class iPhoneButton : public Button
{
public:
	void paint (){
		std::cout << " iPhone Button \n";
       }
};

class ScrollBar
{
public:
	virtual void paint() = 0;
};

class WinScrollBar : public ScrollBar
{
public:
	void paint (){
		std::cout << " Window ScrollBar \n";
       }
};

class MacScrollBar : public ScrollBar
{
public:
	void paint (){
		std::cout << " Mac ScrollBar \n";
       }
};

class iPhoneScrollBar : public ScrollBar
{
public:
	void paint (){
		std::cout << " iPhone ScrollBar \n";
       }
};


class GUIFactory
{
public:
	virtual Button* createButton () = 0;
	virtual ScrollBar* createScrollBar () = 0;
};

class WinFactory : public GUIFactory
{
public:
	Button* createButton (){
		return new WinButton;
	}
	ScrollBar* createScrollBar (){
		return new WinScrollBar;
	}
};

class MacFactory : public GUIFactory
{
public:
	Button* createButton (){
		return new MacButton;
	}
	ScrollBar* createScrollBar (){
		return new MacScrollBar;
	}
};

class iPhoneFactory : public GUIFactory
{
public:
	Button* createButton (){
		return new iPhoneButton;
	}
	ScrollBar* createScrollBar (){
		return new iPhoneScrollBar;
	}
};

int main()
{
	GUIFactory* guiFactory;
	Button *btn;
	ScrollBar *sb;

	guiFactory = new MacFactory;
	btn = guiFactory->createButton();
	btn -> paint();
	sb = guiFactory->createScrollBar();
	sb -> paint();

	guiFactory = new WinFactory;
	btn = guiFactory->createButton();
	btn -> paint();
	sb = guiFactory->createScrollBar();
	sb -> paint();

	guiFactory = new iPhoneFactory;
	btn = guiFactory->createButton();
	btn -> paint();
	sb = guiFactory->createScrollBar();
	sb -> paint();

	return 0;
}