| /*============================================================================= |
| Copyright (c) 2001-2011 Joel de Guzman |
| Copyright (c) 2005-2006 Dan Marsden |
| Copyright (c) 2018 Kohei Takahashi |
| |
| 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_AT_IMPL_20061029_1946) |
| #define BOOST_FUSION_AT_IMPL_20061029_1946 |
| |
| #include <boost/fusion/support/config.hpp> |
| #include <boost/fusion/sequence/intrinsic/at.hpp> |
| #include <boost/utility/result_of.hpp> |
| |
| namespace boost { namespace fusion { |
| struct transform_view_tag; |
| struct transform_view2_tag; |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct at_impl; |
| |
| template<> |
| struct at_impl<transform_view_tag> |
| { |
| template<typename Seq, typename N> |
| struct apply |
| { |
| typedef typename Seq::transform_type F; |
| typedef typename result_of::at<typename Seq::sequence_type, N>::type value_type; |
| typedef typename boost::result_of<F(value_type)>::type type; |
| |
| BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type call(Seq& seq) |
| { |
| return seq.f(boost::fusion::at<N>(seq.seq)); |
| } |
| }; |
| }; |
| |
| template<> |
| struct at_impl<transform_view2_tag> |
| { |
| template<typename Seq, typename N> |
| struct apply |
| { |
| typedef typename Seq::transform_type F; |
| typedef typename result_of::at<typename Seq::sequence1_type, N>::type value1_type; |
| typedef typename result_of::at<typename Seq::sequence2_type, N>::type value2_type; |
| typedef typename boost::result_of<F(value1_type, value2_type)>::type type; |
| |
| BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type call(Seq& seq) |
| { |
| return seq.f(boost::fusion::at<N>(seq.seq1), boost::fusion::at<N>(seq.seq2)); |
| } |
| }; |
| }; |
| } |
| }} |
| |
| #endif |