How do I connect these slots and signals? The document I got the code from never explained that part, and so far I just crash my program trying.

Qt Code: 
  1. class ClipboardInterface
  2.     {
  3.     public:
  4.         virtual void cut() = 0;
  5.         virtual void copy() const = 0;
  6.         virtual void paste() = 0;
  7.     };
  8.  
  9.     class ClipboardEvents
  10.     {
  11.     public:
  12.         virtual void copyAvailableChange(bool available) = 0;
  13.         virtual void pasteAvailableChange(bool available) = 0;
  14.     };
  15.  
  16.     class ClipboardWrapper : public QObject,
  17.                              public ClipboardInterface,
  18.                              public ClipboardEvents
  19.     {
  20.         Q_OBJECT
  21.  
  22.     public:
  23.         ClipboardWrapper(QObject *parent);
  24.  
  25.     public slots:
  26.         void cut() { wrappedObject->cut(); }
  27.         void copy() const { wrappedObject->copy(); }
  28.         void paste() { wrappedObject->paste(); }
  29.  
  30.     signals:
  31.         void copyAvailableChange(bool available);
  32.         void pasteAvailableChange(bool available);
  33.  
  34.     private:
  35.         ClipboardInterface *wrappedObject;
  36.     };
  37.  
  38.     class CustomWidget : public QWidget,
  39.                          public ClipboardInterface
  40.     {
  41.         Q_OBJECT
  42.  
  43.     public:
  44.         CustomWidget(QWidget *parent = 0);
  45.  
  46.         void cut();
  47.         void copy() const;
  48.         void paste();
  49.  
  50.     private:
  51.         ClipboardWrapper *wrapper;
  52.     };
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