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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_END_IMPL_20060123_2208)
- #define FUSION_END_IMPL_20060123_2208
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/view/zip_view/zip_view_iterator_fwd.hpp>
- #include <boost/fusion/sequence/intrinsic/end.hpp>
- #include <boost/fusion/sequence/intrinsic/begin.hpp>
- #include <boost/fusion/sequence/intrinsic/size.hpp>
- #include <boost/fusion/sequence/intrinsic/front.hpp>
- #include <boost/fusion/iterator/advance.hpp>
- #include <boost/fusion/algorithm/transformation/transform.hpp>
- #include <boost/type_traits/remove_reference.hpp>
- #include <boost/type_traits/is_reference.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/min.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/type_traits/is_same.hpp>
- namespace boost { namespace fusion {
- struct zip_view_tag;
- namespace detail
- {
- template<typename SeqRef, typename M>
- struct get_endpoint
- {
- typedef typename remove_reference<SeqRef>::type Seq;
- typedef typename result_of::begin<Seq>::type begin;
- typedef typename result_of::advance<begin, M>::type type;
- };
- template<typename M>
- struct endpoints
- {
- template<typename T>
- struct result;
- template<typename M1, typename SeqRef>
- struct result<endpoints<M1>(SeqRef)>
- : mpl::eval_if<is_same<SeqRef, unused_type const&>,
- mpl::identity<unused_type>,
- get_endpoint<SeqRef, M> >
- {
- BOOST_MPL_ASSERT((is_reference<SeqRef>));
- };
- template<typename Seq>
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- typename result<endpoints(Seq&)>::type
- operator()(Seq& seq) const
- {
- return fusion::advance<M>(fusion::begin(seq));
- }
- template<typename Seq>
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- typename result<endpoints(Seq const&)>::type
- operator()(Seq const& seq) const
- {
- return fusion::advance<M>(fusion::begin(seq));
- }
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- unused_type operator()(unused_type const&) const
- {
- return unused_type();
- }
- };
- }
- namespace extension
- {
- template<typename Tag>
- struct end_impl;
- template<>
- struct end_impl<zip_view_tag>
- {
- template<typename Sequence>
- struct apply
- {
- typedef zip_view_iterator<
- typename result_of::transform<typename Sequence::sequences, detail::endpoints<typename Sequence::size> >::type,
- typename Sequence::category> type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& sequence)
- {
- return type(
- fusion::transform(sequence.sequences_, detail::endpoints<typename Sequence::size>()));
- }
- };
- };
- }
- }}
- #endif
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