ceph/src/boost/boost/geometry/views/reversible_view.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
   6
   7 // This file was modified by Oracle on 2020.
   8 // Modifications copyright (c) 2020 Oracle and/or its affiliates.
   9 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  10
  11 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  12 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  13
  14 // Use, modification and distribution is subject to the Boost Software License,
  15 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  16 // http://www.boost.org/LICENSE_1_0.txt)
  17
  18 #ifndef BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
  19 #define BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
  20
  21
  22 #include <boost/version.hpp>
  23 #include <boost/range/adaptor/reversed.hpp>
  24
  25 #include <boost/geometry/core/ring_type.hpp>
  26 #include <boost/geometry/core/tag.hpp>
  27 #include <boost/geometry/core/tags.hpp>
  28
  29 #include <boost/geometry/views/identity_view.hpp>
  30
  31 namespace boost { namespace geometry
  32 {
  33
  34 /*!
  35 \brief Flag for iterating a reversible_view in forward or reverse direction
  36 \ingroup views
  37 */
  38 enum iterate_direction { iterate_forward, iterate_reverse };
  39
  40 /*!
  41 \brief View on a range, reversing direction if necessary
  42 \tparam Range original range
  43 \tparam Direction direction of iteration
  44 \ingroup views
  45 */
  46 template <typename Range, iterate_direction Direction>
  47 struct reversible_view {};
  48
  49
  50
  51 #ifndef DOXYGEN_NO_SPECIALIZATIONS
  52
  53 template <typename Range>
  54 struct reversible_view<Range, iterate_forward>
  55 {
  56     typedef identity_view<Range> type;
  57 };
  58
  59
  60 template <typename Range>
  61 struct reversible_view<Range, iterate_reverse>
  62 {
  63 #if BOOST_VERSION > 104500
  64     typedef boost::reversed_range<Range> type;
  65 #else
  66     // For older versions of Boost
  67     typedef boost::range_detail::reverse_range<Range> type;
  68 #endif
  69 };
  70
  71 #endif // DOXYGEN_NO_SPECIALIZATIONS
  72
  73
  74 }} // namespace boost::geometry
  75
  76
  77 #endif // BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP