141 lines
5.1 KiB
Plaintext
141 lines
5.1 KiB
Plaintext
/*=============================================================================
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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_ERASE_07232005_0534)
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#define FUSION_ERASE_07232005_0534
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/equal_to.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/iterator_range/iterator_range.hpp>
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#include <boost/fusion/support/detail/as_fusion_element.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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#include <boost/mpl/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 First>
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struct compute_erase_last // put this in detail!!!
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{
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typedef typename result_of::end<Sequence>::type seq_last_type;
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typedef typename convert_iterator<First>::type first_type;
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typedef typename
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mpl::if_<
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result_of::equal_to<first_type, seq_last_type>
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, first_type
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, typename result_of::next<first_type>::type
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const& first, mpl::false_)
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{
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return fusion::next(convert_iterator<First>::call(first));
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const& first, mpl::true_)
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{
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return convert_iterator<First>::call(first);
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const& first)
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{
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return call(first, result_of::equal_to<first_type, seq_last_type>());
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}
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};
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struct use_default;
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template <class T, class Default>
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struct fusion_default_help
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: mpl::if_<
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is_same<T, use_default>
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, Default
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, T
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>
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{
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};
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template <
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typename Sequence
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, typename First
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, typename Last = use_default>
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struct erase
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{
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typedef typename result_of::begin<Sequence>::type seq_first_type;
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typedef typename result_of::end<Sequence>::type seq_last_type;
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BOOST_STATIC_ASSERT((!result_of::equal_to<seq_first_type, seq_last_type>::value));
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typedef First FirstType;
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typedef typename
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fusion_default_help<
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Last
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, typename compute_erase_last<Sequence, First>::type
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>::type
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LastType;
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typedef typename convert_iterator<FirstType>::type first_type;
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typedef typename convert_iterator<LastType>::type last_type;
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typedef iterator_range<seq_first_type, first_type> left_type;
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typedef iterator_range<last_type, seq_last_type> right_type;
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typedef joint_view<left_type, right_type> type;
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};
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}
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template <typename Sequence, typename First>
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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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, typename result_of::erase<Sequence const, First>
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>::type
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erase(Sequence const& seq, First const& first)
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{
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typedef result_of::erase<Sequence const, First> 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::type result_type;
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left_type left(
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fusion::begin(seq)
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, convert_iterator<First>::call(first));
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right_type right(
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fusion::result_of::compute_erase_last<Sequence const, First>::call(first)
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, fusion::end(seq));
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return result_type(left, right);
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}
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template <typename Sequence, typename First, typename Last>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::erase<Sequence const, First, Last>::type
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erase(Sequence const& seq, First const& first, Last const& last)
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{
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typedef result_of::erase<Sequence const, First, Last> 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::type result_type;
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left_type left(fusion::begin(seq), first);
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right_type right(last, fusion::end(seq));
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return result_type(left, right);
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}
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}}
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#endif
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