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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Copyright (c) 2006 Dan Marsden
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #if !defined(FUSION_ZIP_VIEW_23012006_0813)
- #define FUSION_ZIP_VIEW_23012006_0813
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/support/sequence_base.hpp>
- #include <boost/fusion/support/unused.hpp>
- #include <boost/fusion/iterator/equal_to.hpp>
- #include <boost/fusion/view/detail/strictest_traversal.hpp>
- #include <boost/fusion/view/zip_view/detail/begin_impl.hpp>
- #include <boost/fusion/view/zip_view/detail/end_impl.hpp>
- #include <boost/fusion/view/zip_view/detail/size_impl.hpp>
- #include <boost/fusion/view/zip_view/detail/at_impl.hpp>
- #include <boost/fusion/view/zip_view/detail/value_at_impl.hpp>
- #include <boost/fusion/container/vector/convert.hpp>
- #include <boost/fusion/algorithm/query/find_if.hpp>
- #include <boost/fusion/sequence/intrinsic/end.hpp>
- #include <boost/fusion/sequence/intrinsic/size.hpp>
- #include <boost/fusion/mpl.hpp>
- #include <boost/fusion/algorithm/transformation/remove.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/not.hpp>
- #include <boost/mpl/placeholders.hpp>
- #include <boost/mpl/transform_view.hpp>
- #include <boost/mpl/at.hpp>
- #include <boost/mpl/find_if.hpp>
- #include <boost/mpl/equal_to.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/type_traits/remove_reference.hpp>
- #include <boost/type_traits/is_reference.hpp>
- #include <boost/config.hpp>
- namespace boost { namespace fusion {
- namespace detail
- {
- template<typename Sequences>
- struct all_references
- : 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>
- {};
- struct seq_ref_size
- {
- template<typename Params>
- struct result;
- template<typename Seq>
- struct result<seq_ref_size(Seq)>
- {
- static int const high_int = static_cast<int>(
- (static_cast<unsigned>(~0) >> 1) - 1);
- typedef typename remove_reference<Seq>::type SeqClass;
- typedef typename mpl::eval_if<
- traits::is_forward<SeqClass>,
- result_of::size<SeqClass>,
- mpl::int_<high_int> >::type type;
- };
- // never called, but needed for decltype-based result_of (C++0x)
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- template<typename Seq>
- BOOST_FUSION_GPU_ENABLED
- typename result<seq_ref_size(Seq)>::type
- operator()(Seq&&) const;
- #endif
- };
- struct poly_min
- {
- template<typename T>
- struct result;
- template<typename Lhs, typename Rhs>
- struct result<poly_min(Lhs, Rhs)>
- {
- typedef typename remove_reference<Lhs>::type lhs;
- typedef typename remove_reference<Rhs>::type rhs;
- typedef typename mpl::min<lhs, rhs>::type type;
- };
- // never called, but needed for decltype-based result_of (C++0x)
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- template<typename Lhs, typename Rhs>
- BOOST_FUSION_GPU_ENABLED
- typename result<poly_min(Lhs, Rhs)>::type
- operator()(Lhs&&, Rhs&&) const;
- #endif
- };
- template<typename Sequences>
- struct min_size
- {
- typedef typename result_of::transform<Sequences, detail::seq_ref_size>::type sizes;
- typedef typename result_of::fold<sizes, typename result_of::front<sizes>::type, detail::poly_min>::type type;
- };
- }
- struct zip_view_tag;
- struct fusion_sequence_tag;
- template<typename Sequences>
- struct zip_view : sequence_base< zip_view<Sequences> >
- {
- typedef typename result_of::remove<Sequences, unused_type const&>::type real_sequences;
- BOOST_MPL_ASSERT((detail::all_references<Sequences>));
- typedef typename detail::strictest_traversal<real_sequences>::type category;
- typedef zip_view_tag fusion_tag;
- typedef fusion_sequence_tag tag; // this gets picked up by MPL
- typedef mpl::true_ is_view;
- typedef typename fusion::result_of::as_vector<Sequences>::type sequences;
- typedef typename detail::min_size<real_sequences>::type size;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- zip_view(
- const Sequences& seqs)
- : sequences_(seqs)
- {}
- sequences sequences_;
- };
- }}
- #endif
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