#include <QtCore/qlinkedlist.h>
#ifndef QLINKEDLIST_H
template < typename T > class QLinkedList{
   /* Some contents are skipped to improve readability */
   public: class const_iterator{
      /* ... */
      public: typedef ptrdiff_t difference_type;
      /* ... */
   };
   /* ... */
};
#endif // QLINKEDLIST_H