text: 
  #ifndef BOOST_MPL_LIST_AUX_EMPTY_HPP_INCLUDED
  #define BOOST_MPL_LIST_AUX_EMPTY_HPP_INCLUDED
  
  // Copyright Aleksey Gurtovoy 2000-2004
  //
  // Distributed under the Boost Software License, Version 1.0. 
  // (See accompanying file LICENSE_1_0.txt or copy at 
  // http://www.boost.org/LICENSE_1_0.txt)
  //
  // See http://www.boost.org/libs/mpl for documentation.
  
  // $Id: empty.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
  // $Revision: 49267 $
  
  #include <boost/mpl/empty_fwd.hpp>
  #include <boost/mpl/not.hpp>
  #include <boost/mpl/list/aux_/tag.hpp>
  
  namespace boost { namespace mpl {
  
  template<>
  struct empty_impl< aux::list_tag >
  {
      template< typename List > struct apply
          : not_<typename List::size>
      {
      };
  };
  
  }}
  
  #endif // BOOST_MPL_LIST_AUX_EMPTY_HPP_INCLUDED
  