#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: at_impl.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/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