| /*============================================================================= |
| Copyright (c) 2001-2006 Joel de Guzman |
| Copyright (c) 2005-2006 Dan Marsden |
| |
| 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(BOOST_FUSION_VALUE_AT_IMPL_20061101_0745) |
| #define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745 |
| |
| #include <boost/mpl/apply.hpp> |
| #include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp> |
| #include <boost/fusion/sequence/intrinsic/value_at.hpp> |
| |
| namespace boost { namespace fusion { |
| struct transform_view_tag; |
| struct transform_view2_tag; |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct value_at_impl; |
| |
| template<> |
| struct value_at_impl<transform_view_tag> |
| { |
| template<typename Seq, typename N> |
| struct apply |
| { |
| typedef typename Seq::transform_type F; |
| typedef detail::apply_transform_result<F> transform_type; |
| typedef typename boost::fusion::result_of::value_at<typename Seq::sequence_type, N>::type value_type; |
| typedef typename mpl::apply<transform_type, value_type>::type type; |
| }; |
| }; |
| |
| template<> |
| struct value_at_impl<transform_view2_tag> |
| { |
| template<typename Seq, typename N> |
| struct apply |
| { |
| typedef typename Seq::transform_type F; |
| typedef detail::apply_transform_result<F> transform_type; |
| typedef typename boost::fusion::result_of::value_at<typename Seq::sequence1_type, N>::type value1_type; |
| typedef typename boost::fusion::result_of::value_at<typename Seq::sequence2_type, N>::type value2_type; |
| typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type; |
| }; |
| }; |
| } |
| }} |
| |
| #endif |