text: 
  #ifndef BOOST_MPL_AT_HPP_INCLUDED
  #define BOOST_MPL_AT_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: at.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
  // $Revision: 49267 $
  
  #include <boost/mpl/at_fwd.hpp>
  #include <boost/mpl/aux_/at_impl.hpp>
  #include <boost/mpl/long.hpp>
  #include <boost/mpl/sequence_tag.hpp>
  #include <boost/mpl/aux_/na_spec.hpp>
  #include <boost/mpl/aux_/lambda_support.hpp>
  #include <boost/mpl/aux_/nttp_decl.hpp>
  
  namespace boost { namespace mpl {
  
  template<
        typename BOOST_MPL_AUX_NA_PARAM(Sequence)
      , typename BOOST_MPL_AUX_NA_PARAM(N)
      >
  struct at
      : at_impl< typename sequence_tag<Sequence>::type >
          ::template apply< Sequence,N >
  {
      BOOST_MPL_AUX_LAMBDA_SUPPORT(2,at,(Sequence,N))
  };
  
  template<
        typename Sequence
      , BOOST_MPL_AUX_NTTP_DECL(long, N)
      >
  struct at_c
      : at_impl< typename sequence_tag<Sequence>::type >
          ::template apply< Sequence,mpl::long_<N> >
  {
  };
  
  BOOST_MPL_AUX_NA_SPEC(2, at)
  
  }}
  
  #endif // BOOST_MPL_AT_HPP_INCLUDED
  