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108 lines
4.1 KiB
108 lines
4.1 KiB
/*============================================================================= |
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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/iterator/equal_to.hpp> |
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#include <boost/fusion/iterator/mpl/convert_iterator.hpp> |
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#include <boost/fusion/container/vector/vector10.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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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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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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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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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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template < |
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typename Sequence |
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, typename First |
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, typename Last = typename compute_erase_last<Sequence, First>::type> |
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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 typename convert_iterator<First>::type first_type; |
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typedef typename convert_iterator<Last>::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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typename result_of::erase<Sequence const, First>::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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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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