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#ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_AT_IMPL_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/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;
};
};
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
}}
#endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
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