boost/fusion/iterator/detail/segment_sequence.hpp

   1 /*=============================================================================
   2     Copyright (c) 2011 Eric Niebler
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_FUSION_SEGMENTED_SEQUENCE_HPP_INCLUDED)
   8 #define BOOST_FUSION_SEGMENTED_SEQUENCE_HPP_INCLUDED
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/mpl/bool.hpp>
  12 #include <boost/type_traits/remove_reference.hpp>
  13 #include <boost/fusion/support/tag_of.hpp>
  14 #include <boost/fusion/sequence/intrinsic_fwd.hpp>
  15
  16 namespace boost { namespace fusion { namespace detail
  17 {
  18     struct segment_sequence_tag {};
  19
  20     // Here, Sequence is a sequence of ranges (which may or may not be
  21     // segmented).
  22     template<typename Sequence>
  23     struct segment_sequence
  24         : sequence_base<segment_sequence<Sequence> >
  25     {
  26         typedef fusion_sequence_tag tag;
  27         typedef segment_sequence_tag fusion_tag;
  28         typedef typename Sequence::is_view is_view;
  29         typedef typename Sequence::category category;
  30         typedef Sequence sequence_type;
  31         sequence_type sequence;
  32
  33         BOOST_FUSION_GPU_ENABLED explicit segment_sequence(Sequence const & seq)
  34             : sequence(seq)
  35         {}
  36     };
  37 }
  38
  39 namespace extension
  40 {
  41     template<typename Tag>
  42     struct is_segmented_impl;
  43
  44     template<>
  45     struct is_segmented_impl<detail::segment_sequence_tag>
  46     {
  47         template<typename Sequence>
  48         struct apply
  49             : mpl::true_
  50         {};
  51     };
  52
  53     template<typename Tag>
  54     struct segments_impl;
  55
  56     template<>
  57     struct segments_impl<detail::segment_sequence_tag>
  58     {
  59         template<typename Sequence>
  60         struct apply
  61         {
  62             typedef typename Sequence::sequence_type type;
  63
  64             BOOST_FUSION_GPU_ENABLED
  65             static type call(Sequence & seq)
  66             {
  67                 return seq.sequence;
  68             }
  69         };
  70     };
  71 }}}
  72
  73 #endif