ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/overlay/do_reverse.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2013 Adam Wulkiewicz, Lodz, Poland
   5
   6 // Use, modification and distribution is subject to the Boost Software License,
   7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_DO_REVERSE_HPP
  11 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_DO_REVERSE_HPP
  12
  13 #include <boost/geometry/core/point_order.hpp>
  14
  15 namespace boost { namespace geometry
  16 {
  17
  18
  19 #ifndef DOXYGEN_NO_DETAIL
  20 namespace detail { namespace overlay
  21 {
  22
  23 // Metafunction helper for intersection and union
  24 template <order_selector Selector, bool Reverse = false>
  25 struct do_reverse {};
  26
  27 template <>
  28 struct do_reverse<clockwise, false> : boost::false_type {};
  29
  30 template <>
  31 struct do_reverse<clockwise, true> : boost::true_type {};
  32
  33 template <>
  34 struct do_reverse<counterclockwise, false> : boost::true_type {};
  35
  36 template <>
  37 struct do_reverse<counterclockwise, true> : boost::false_type {};
  38
  39
  40 }} // namespace detail::overlay
  41 #endif // DOXYGEN_NO_DETAIL
  42
  43
  44 }} // namespace boost::geometry
  45
  46
  47 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_DO_REVERSE_HPP