text: 
  // The Loki Library
  // Copyright (c) 2001 by Andrei Alexandrescu
  // This code accompanies the book:
  // Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design 
  //     Patterns Applied". Copyright (c) 2001. Addison-Wesley.
  // Permission to use, copy, modify, distribute and sell this software for any 
  //     purpose is hereby granted without fee, provided that the above copyright 
  //     notice appear in all copies and that both that copyright notice and this 
  //     permission notice appear in supporting documentation.
  // The author or Addison-Wesley Longman make no representations about the 
  //     suitability of this software for any purpose. It is provided "as is" 
  //     without express or implied warranty.
  #ifndef LOKI_NULLTYPE_INC_
  #define LOKI_NULLTYPE_INC_
  
  // $Id: NullType.h 751 2006-10-17 19:50:37Z syntheticpp $
  
  
  namespace Loki
  {
  // class NullType
  // Used as a placeholder for "no type here"
  // Useful as an end marker in typelists 
  
      class NullType {};
      
  }   // namespace Loki
  
  
  #endif // end file guardian