| /*============================================================================= |
| Copyright (c) 2001-2006 Joel de Guzman |
| |
| 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) |
| ==============================================================================*/ |
| #if !defined(FUSION_AT_IMPL_05042005_0741) |
| #define FUSION_AT_IMPL_05042005_0741 |
| |
| #include <boost/fusion/support/detail/access.hpp> |
| #include <boost/type_traits/is_const.hpp> |
| #include <boost/mpl/at.hpp> |
| #include <boost/mpl/int.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct vector_tag; |
| |
| namespace extension |
| { |
| template <typename Tag> |
| struct at_impl; |
| |
| template <> |
| struct at_impl<vector_tag> |
| { |
| template <typename Sequence, typename N> |
| struct apply |
| { |
| typedef mpl::at<typename Sequence::types, N> element; |
| typedef typename detail::ref_result<element>::type type; |
| |
| static type |
| call(Sequence& v) |
| { |
| return v.at_impl(N()); |
| } |
| }; |
| |
| template <typename Sequence, typename N> |
| struct apply <Sequence const, N> |
| { |
| typedef mpl::at<typename Sequence::types, N> element; |
| typedef typename detail::cref_result<element>::type type; |
| |
| static type |
| call(Sequence const& v) |
| { |
| return v.at_impl(N()); |
| } |
| }; |
| }; |
| } |
| }} |
| |
| #endif |