c++ 设计模式之 抽象工厂模式

概念：

抽象工厂模式提供了一个创建相似或相关相互依赖的对象，而不需要说明其具体的实现.

示例代码：

[cpp]
#include

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;
}