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65 lines
2.2 KiB
65 lines
2.2 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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Copyright (c) 2018 Kohei Takahashi
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_AT_IMPL_20061029_1946)
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#define BOOST_FUSION_AT_IMPL_20061029_1946
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/sequence/intrinsic/at.hpp>
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#include <boost/utility/result_of.hpp>
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namespace boost { namespace fusion {
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struct transform_view_tag;
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struct transform_view2_tag;
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namespace extension
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{
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template<typename Tag>
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struct at_impl;
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template<>
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struct at_impl<transform_view_tag>
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{
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template<typename Seq, typename N>
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struct apply
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{
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typedef typename Seq::transform_type F;
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typedef typename result_of::at<typename Seq::sequence_type, N>::type value_type;
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typedef typename boost::result_of<F(value_type)>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call(Seq& seq)
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{
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return seq.f(boost::fusion::at<N>(seq.seq));
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}
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};
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};
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template<>
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struct at_impl<transform_view2_tag>
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{
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template<typename Seq, typename N>
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struct apply
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{
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typedef typename Seq::transform_type F;
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typedef typename result_of::at<typename Seq::sequence1_type, N>::type value1_type;
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typedef typename result_of::at<typename Seq::sequence2_type, N>::type value2_type;
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typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call(Seq& seq)
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{
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return seq.f(boost::fusion::at<N>(seq.seq1), boost::fusion::at<N>(seq.seq2));
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}
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};
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};
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}
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}}
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#endif
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