/**/class VisualComponent;class Window {  public:    void SetContents (VisualComponent* contents);};/**/class VisualComponent {public:    VisualComponent();    virtual void Draw();    virtual void Resize();    // ...};/**/class Decorator : public VisualComponent {public:    Decorator(VisualComponent*);/**/    virtual void Draw();    virtual void Resize();    // ...private:    VisualComponent* _component;};/**/void Decorator::Draw () {    _component->Draw();}void Decorator::Resize () {    _component->Resize();}/**/class BorderDecorator : public Decorator {public:    BorderDecorator(VisualComponent*, int borderWidth);    virtual void Draw();private:    void DrawBorder(int);private:    int _width;};/**/void BorderDecorator::Draw () {    Decorator::Draw();    DrawBorder(_width);}/**/void Window::SetContents (VisualComponent* contents) {    // ...}/**/class ScrollDecorator : public Decorator {public:    ScrollDecorator(VisualComponent*);};class TextView : public VisualComponent {};main () {/**/Window* window = new Window;TextView* textView = new TextView;/**/window->SetContents(textView);/**/window->SetContents(    new BorderDecorator(        new ScrollDecorator(textView), 1    ));/**/}/**/class Stream {  public:    virtual void PutInt(int);    virtual void PutString(const char*);};class StreamDecorator : public Stream {  public:    StreamDecorator(Stream*);  private:    Stream* _component;};class CompressingStream : public StreamDecorator {  public:    CompressingStream(Stream*);};class ASCII7Stream : public Stream {  public:    ASCII7Stream(Stream*);};class FileStream : public Stream {  public:    FileStream(const char*);};void dummy() {/**/Stream* aStream = new CompressingStream(    new ASCII7Stream(         new FileStream("aFileName")    ));aStream->PutInt(12);aStream->PutString("aString");/**/}/**/