136 lines
4.9 KiB
Plaintext
136 lines
4.9 KiB
Plaintext
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2006 Dan Marsden
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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_ZIP_VIEW_23012006_0813)
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#define FUSION_ZIP_VIEW_23012006_0813
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/sequence_base.hpp>
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#include <boost/fusion/support/unused.hpp>
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#include <boost/fusion/iterator/equal_to.hpp>
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#include <boost/fusion/view/detail/strictest_traversal.hpp>
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#include <boost/fusion/view/zip_view/detail/begin_impl.hpp>
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#include <boost/fusion/view/zip_view/detail/end_impl.hpp>
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#include <boost/fusion/view/zip_view/detail/size_impl.hpp>
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#include <boost/fusion/view/zip_view/detail/at_impl.hpp>
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#include <boost/fusion/view/zip_view/detail/value_at_impl.hpp>
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#include <boost/fusion/container/vector/convert.hpp>
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#include <boost/fusion/algorithm/query/find_if.hpp>
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#include <boost/fusion/sequence/intrinsic/end.hpp>
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#include <boost/fusion/sequence/intrinsic/size.hpp>
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#include <boost/fusion/mpl.hpp>
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#include <boost/fusion/algorithm/transformation/remove.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/placeholders.hpp>
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#include <boost/mpl/transform_view.hpp>
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/find_if.hpp>
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#include <boost/mpl/equal_to.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/is_reference.hpp>
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#include <boost/config.hpp>
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namespace boost { namespace fusion {
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namespace detail
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{
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template<typename Sequences>
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struct all_references
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: fusion::result_of::equal_to<typename fusion::result_of::find_if<Sequences, mpl::not_<is_reference<mpl::_> > >::type, typename fusion::result_of::end<Sequences>::type>
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{};
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struct seq_ref_size
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{
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template<typename Params>
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struct result;
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template<typename Seq>
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struct result<seq_ref_size(Seq)>
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{
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static int const high_int = static_cast<int>(
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(static_cast<unsigned>(~0) >> 1) - 1);
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typedef typename remove_reference<Seq>::type SeqClass;
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typedef typename mpl::eval_if<
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traits::is_forward<SeqClass>,
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result_of::size<SeqClass>,
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mpl::int_<high_int> >::type type;
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};
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// never called, but needed for decltype-based result_of (C++0x)
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<typename Seq>
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BOOST_FUSION_GPU_ENABLED
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typename result<seq_ref_size(Seq)>::type
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operator()(Seq&&) const;
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#endif
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};
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struct poly_min
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{
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template<typename T>
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struct result;
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template<typename Lhs, typename Rhs>
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struct result<poly_min(Lhs, Rhs)>
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{
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typedef typename remove_reference<Lhs>::type lhs;
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typedef typename remove_reference<Rhs>::type rhs;
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typedef typename mpl::min<lhs, rhs>::type type;
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};
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// never called, but needed for decltype-based result_of (C++0x)
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<typename Lhs, typename Rhs>
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BOOST_FUSION_GPU_ENABLED
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typename result<poly_min(Lhs, Rhs)>::type
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operator()(Lhs&&, Rhs&&) const;
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#endif
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};
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template<typename Sequences>
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struct min_size
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{
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typedef typename result_of::transform<Sequences, detail::seq_ref_size>::type sizes;
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typedef typename result_of::fold<sizes, typename result_of::front<sizes>::type, detail::poly_min>::type type;
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};
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}
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struct zip_view_tag;
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struct fusion_sequence_tag;
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template<typename Sequences>
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struct zip_view : sequence_base< zip_view<Sequences> >
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{
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typedef typename result_of::remove<Sequences, unused_type const&>::type real_sequences;
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BOOST_MPL_ASSERT((detail::all_references<Sequences>));
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typedef typename detail::strictest_traversal<real_sequences>::type category;
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typedef zip_view_tag fusion_tag;
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typedef fusion_sequence_tag tag; // this gets picked up by MPL
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typedef mpl::true_ is_view;
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typedef typename fusion::result_of::as_vector<Sequences>::type sequences;
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typedef typename detail::min_size<real_sequences>::type size;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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zip_view(
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const Sequences& seqs)
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: sequences_(seqs)
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{}
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sequences sequences_;
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};
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}}
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#endif
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