ceph/src/boost/libs/fusion/include/boost/fusion/view/reverse_view/reverse_view.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   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(FUSION_REVERSE_VIEW_07202005_0836)
   8 #define FUSION_REVERSE_VIEW_07202005_0836
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/support/detail/access.hpp>
  12 #include <boost/fusion/support/is_view.hpp>
  13 #include <boost/fusion/support/category_of.hpp>
  14 #include <boost/fusion/view/reverse_view/reverse_view_iterator.hpp>
  15 #include <boost/fusion/view/reverse_view/detail/begin_impl.hpp>
  16 #include <boost/fusion/view/reverse_view/detail/end_impl.hpp>
  17 #include <boost/fusion/view/reverse_view/detail/at_impl.hpp>
  18 #include <boost/fusion/view/reverse_view/detail/value_at_impl.hpp>
  19 #include <boost/fusion/support/sequence_base.hpp>
  20 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  21 #include <boost/fusion/sequence/intrinsic/end.hpp>
  22 #include <boost/fusion/sequence/intrinsic/size.hpp>
  23 #include <boost/type_traits/is_base_of.hpp>
  24 #include <boost/static_assert.hpp>
  25 #include <boost/mpl/bool.hpp>
  26 #include <boost/mpl/eval_if.hpp>
  27 #include <boost/mpl/inherit.hpp>
  28 #include <boost/mpl/identity.hpp>
  29
  30 namespace boost { namespace fusion
  31 {
  32     struct reverse_view_tag;
  33     struct fusion_sequence_tag;
  34
  35     template <typename Sequence>
  36     struct reverse_view : sequence_base<reverse_view<Sequence> >
  37     {
  38         typedef reverse_view_tag fusion_tag;
  39         typedef fusion_sequence_tag tag; // this gets picked up by MPL
  40         typedef mpl::true_ is_view;
  41
  42         typedef Sequence seq_type;
  43         typedef typename traits::category_of<Sequence>::type category;
  44         typedef typename result_of::begin<Sequence>::type first_type;
  45         typedef typename result_of::end<Sequence>::type last_type;
  46         typedef typename result_of::size<Sequence>::type size;
  47
  48         BOOST_STATIC_ASSERT((
  49             is_base_of<
  50                 bidirectional_traversal_tag
  51               , typename traits::category_of<first_type>::type>::value));
  52
  53         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  54         reverse_view(Sequence& in_seq)
  55             : seq(in_seq)
  56         {}
  57
  58         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  59         first_type first() const { return fusion::begin(seq); }
  60         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  61         last_type last() const { return fusion::end(seq); }
  62         typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq;
  63
  64     private:
  65         // silence MSVC warning C4512: assignment operator could not be generated
  66         reverse_view& operator= (reverse_view const&);
  67     };
  68 }}
  69
  70 #endif
  71
  72