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76 lines
2.2 KiB
76 lines
2.2 KiB
/*============================================================================= |
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Copyright (c) 2006 Eric Niebler |
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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(BOOST_FUSION_SEGMENTS_04052005_1141) |
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#define BOOST_FUSION_SEGMENTS_04052005_1141 |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/utility/enable_if.hpp> |
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#include <boost/fusion/sequence/intrinsic_fwd.hpp> |
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#include <boost/fusion/support/tag_of.hpp> |
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namespace boost { namespace fusion |
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{ |
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// Special tags: |
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struct sequence_facade_tag; |
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struct iterator_range_tag; |
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// segments: returns a sequence of sequences |
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namespace extension |
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{ |
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template <typename Tag> |
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struct segments_impl |
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{ |
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template <typename Sequence> |
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struct apply {}; |
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}; |
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template <> |
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struct segments_impl<sequence_facade_tag> |
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{ |
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template <typename Sequence> |
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struct apply : Sequence::template segments<Sequence> {}; |
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}; |
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template <> |
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struct segments_impl<iterator_range_tag>; |
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} |
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namespace result_of |
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{ |
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template <typename Sequence> |
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struct segments |
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{ |
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typedef typename traits::tag_of<Sequence>::type tag_type; |
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typedef typename |
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extension::segments_impl<tag_type>::template apply<Sequence>::type |
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type; |
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}; |
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} |
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template <typename Sequence> |
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inline typename |
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lazy_disable_if< |
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is_const<Sequence> |
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, result_of::segments<Sequence> |
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>::type |
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segments(Sequence& seq) |
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{ |
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typedef typename traits::tag_of<Sequence>::type tag_type; |
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return extension::segments_impl<tag_type>::template apply<Sequence>::call(seq); |
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} |
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template <typename Sequence> |
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inline typename result_of::segments<Sequence const>::type |
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segments(Sequence const& seq) |
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{ |
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typedef typename traits::tag_of<Sequence const>::type tag_type; |
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return extension::segments_impl<tag_type>::template apply<Sequence const>::call(seq); |
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} |
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}} |
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#endif
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