| |
| #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 |
