| #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 |