text: 
  #ifndef BOOST_MPL_NEXT_PRIOR_HPP_INCLUDED
  #define BOOST_MPL_NEXT_PRIOR_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.
  
  // $Id$
  // $Date$
  // $Revision$
  
  #include <boost/mpl/aux_/common_name_wknd.hpp>
  #include <boost/mpl/aux_/na_spec.hpp>
  #include <boost/mpl/aux_/lambda_support.hpp>
  
  namespace boost { namespace mpl {
  
  BOOST_MPL_AUX_COMMON_NAME_WKND(next)
  BOOST_MPL_AUX_COMMON_NAME_WKND(prior)
  
  template<
        typename BOOST_MPL_AUX_NA_PARAM(T)
      >
  struct next
  {
      typedef typename T::next type;
      BOOST_MPL_AUX_LAMBDA_SUPPORT(1,next,(T))
  };
  
  template<
        typename BOOST_MPL_AUX_NA_PARAM(T)
      >
  struct prior
  {
      typedef typename T::prior type;
      BOOST_MPL_AUX_LAMBDA_SUPPORT(1,prior,(T))
  };
  
  BOOST_MPL_AUX_NA_SPEC(1, next)
  BOOST_MPL_AUX_NA_SPEC(1, prior)
  
  }}
  
  #endif // BOOST_MPL_NEXT_PRIOR_HPP_INCLUDED
  