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- /*=============================================================================
- Copyright (c) 2007 Tobias Schwinger
- 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(BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED)
- #define BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/iterator/next.hpp>
- #include <boost/fusion/iterator/equal_to.hpp>
- namespace boost { namespace fusion
- {
- struct repetitive_view_iterator_tag;
- template <typename Sequence, typename Pos>
- struct repetitive_view_iterator;
- namespace extension
- {
- template <typename Tag>
- struct next_impl;
- template <>
- struct next_impl<repetitive_view_iterator_tag>
- {
- template<typename Iterator,
- bool Last = result_of::equal_to<typename Iterator::end_type,
- typename result_of::next<
- typename Iterator::pos_type
- >::type>::value >
- struct apply_nonempty // <Iterator,false>
- {
- // advanvce to next position
- typedef repetitive_view_iterator<
- typename Iterator::sequence_type,
- typename result_of::next<typename Iterator::pos_type>::type
- >
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type call(Iterator const& i)
- {
- return type(i.seq, next(i.pos));
- }
- };
- template <typename Iterator>
- struct apply_nonempty<Iterator,true>
- {
- // reset to beginning
- typedef repetitive_view_iterator<
- typename Iterator::sequence_type,
- typename Iterator::first_type
- >
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type call(Iterator const& i)
- {
- return type(i.seq);
- }
- };
- template <typename Iterator,
- bool Empty = result_of::equal_to<typename Iterator::end_type,
- typename Iterator::pos_type>::value >
- struct apply // <Iterator,false>
- : apply_nonempty<Iterator>
- { };
- template <typename Iterator>
- struct apply<Iterator,true>
- {
- // eps^n = eps
- typedef Iterator type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type call(Iterator const& i)
- {
- return type(i);
- }
- };
- };
- }
- }}
- #endif
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