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70 lines
2.8 KiB
70 lines
2.8 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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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(FUSION_INSERT_07222005_0730)
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#define FUSION_INSERT_07222005_0730
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/as_fusion_element.hpp>
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#include <boost/fusion/iterator/mpl/convert_iterator.hpp>
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#include <boost/fusion/view/joint_view/joint_view.hpp>
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#include <boost/fusion/view/single_view/single_view.hpp>
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#include <boost/fusion/view/iterator_range/iterator_range.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/sequence/intrinsic/end.hpp>
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#include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
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#include <boost/fusion/support/is_sequence.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace fusion
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{
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namespace result_of
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{
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template <typename Sequence, typename Position, typename T>
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struct insert
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{
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typedef typename detail::as_fusion_element<T>::type element_type;
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typedef typename convert_iterator<Position>::type pos_type;
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typedef typename result_of::begin<Sequence>::type first_type;
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typedef typename result_of::end<Sequence>::type last_type;
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typedef iterator_range<first_type, pos_type> left_type;
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typedef iterator_range<pos_type, last_type> right_type;
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typedef fusion::single_view<element_type> single_view;
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typedef joint_view<left_type, single_view const> left_insert_type;
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typedef joint_view<left_insert_type, right_type> type;
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};
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}
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template <typename Sequence, typename Position, typename T>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename
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lazy_enable_if<
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traits::is_sequence<Sequence>
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, result_of::insert<Sequence const, Position, T>
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>::type
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insert(Sequence const& seq, Position const& pos, T const& x)
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{
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typedef result_of::insert<
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Sequence const, Position, T>
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result_of;
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typedef typename result_of::left_type left_type;
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typedef typename result_of::right_type right_type;
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typedef typename result_of::single_view single_view;
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typedef typename result_of::left_insert_type left_insert_type;
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typedef typename result_of::type result;
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left_type left(fusion::begin(seq), convert_iterator<Position>::call(pos));
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right_type right(convert_iterator<Position>::call(pos), fusion::end(seq));
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single_view insert(x);
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left_insert_type left_insert(left, insert);
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return result(left_insert, right);
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}
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}}
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#endif
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