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// Copyright Aleksey Gurtovoy 2000-2004
// Distributed under the Boost Software License, Version 1.0. 
// (See accompanying file LICENSE_1_0.txt or copy at 
// See for documentation.

// $Source$
// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
// $Revision: 24874 $

#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/advance.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/aux_/traits_lambda_spec.hpp>

namespace boost { namespace mpl {

// default implementation; conrete sequences might override it by 
// specializing either the 'at_impl' or the primary 'at' template

template< typename Tag >
struct at_impl
    template< typename Sequence, typename N > struct apply
        typedef typename advance<
              typename begin<Sequence>::type
            , N
            >::type iter_;

        typedef typename deref<iter_>::type type;