Widget* aWidget = new BorderDecorator(new BorderDecorator(new ScrollDecorator(new TextField( 80, 24 ))));

Widget* bWidget = new ScrollDecorator(new BorderDecorator(new ScrollDecorator(new TextField( 80, 24 ))));

#include <iostream>using namespace std;/* Component (interface) */
class Widget {public: virtual void draw() = 0; virtual ~Widget() {}
}; /* ConcreteComponent */
class TextField : public Widget {private:                  int width, height;public:TextField( int w, int h ){ width  = w;height = h; }void draw() { cout << "文本框: " << width << ", " << height << '\n'; }
};/* Decorator (interface) */
class Decorator : public Widget {private:Widget* wid;       // reference to Widgetpublic:Decorator( Widget* w )  { wid = w; }void draw() { wid->draw(); }~Decorator() {delete wid;}
};/* ConcreteDecoratorA */
class BorderDecorator : public Decorator { public:BorderDecorator( Widget* w ) : Decorator( w ) { }void draw() {Decorator::draw();    cout << "   添加边框" << '\n'; }
};/* ConcreteDecoratorB */
class ScrollDecorator : public Decorator {
public:ScrollDecorator( Widget* w ) : Decorator( w ) { }void draw() {Decorator::draw(); cout << "   添加滚动" << '\n';}
};int main( void ) {Widget* aWidget = new BorderDecorator(new BorderDecorator(new ScrollDecorator(new TextField( 80, 24 ))));aWidget->draw();delete aWidget;Widget* bWidget = new ScrollDecorator(new BorderDecorator(new ScrollDecorator(new TextField( 80, 24 ))));bWidget->draw();delete bWidget;return 0;
}