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- /*=============================================================================
- 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_VALUE_AT_IMPL_20061101_0745)
- #define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/sequence/intrinsic/value_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 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 typename result_of::value_at<typename Seq::sequence_type, N>::type value_type;
- typedef typename boost::result_of<F(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 typename result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
- typedef typename result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
- typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
- };
- };
- }
- }}
- #endif
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