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

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
   4
   5 // This file was modified by Oracle on 2015.
   6 // Modifications copyright (c) 2015, Oracle and/or its affiliates.
   7
   8 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   9
  10 // Use, modification and distribution is subject to the Boost Software License,
  11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  12 // http://www.boost.org/LICENSE_1_0.txt)
  13
  14 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP
  15 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP
  16
  17
  18 #include <boost/geometry/core/access.hpp>
  19 #include <boost/geometry/core/coordinate_type.hpp>
  20
  21
  22 namespace boost { namespace geometry
  23 {
  24
  25 #ifndef DOXYGEN_NO_DETAIL
  26 namespace detail { namespace intersection
  27 {
  28
  29 template <std::size_t Dimension, std::size_t DimensionCount>
  30 struct intersection_box_box
  31 {
  32     template
  33     <
  34         typename Box1, typename Box2,
  35         typename RobustPolicy,
  36         typename BoxOut,
  37         typename Strategy
  38     >
  39     static inline bool apply(Box1 const& box1,
  40             Box2 const& box2,
  41             RobustPolicy const& robust_policy,
  42             BoxOut& box_out,
  43             Strategy const& strategy)
  44     {
  45         typedef typename coordinate_type<BoxOut>::type ct;
  46
  47         ct max1 = get<max_corner, Dimension>(box1);
  48         ct min2 = get<min_corner, Dimension>(box2);
  49
  50         if (max1 < min2)
  51         {
  52             return false;
  53         }
  54
  55         ct max2 = get<max_corner, Dimension>(box2);
  56         ct min1 = get<min_corner, Dimension>(box1);
  57
  58         if (max2 < min1)
  59         {
  60             return false;
  61         }
  62
  63         // Set dimensions of output coordinate
  64         set<min_corner, Dimension>(box_out, min1 < min2 ? min2 : min1);
  65         set<max_corner, Dimension>(box_out, max1 > max2 ? max2 : max1);
  66
  67         return intersection_box_box<Dimension + 1, DimensionCount>
  68                ::apply(box1, box2, robust_policy, box_out, strategy);
  69     }
  70 };
  71
  72 template <std::size_t DimensionCount>
  73 struct intersection_box_box<DimensionCount, DimensionCount>
  74 {
  75     template
  76     <
  77         typename Box1, typename Box2,
  78         typename RobustPolicy,
  79         typename BoxOut,
  80         typename Strategy
  81     >
  82     static inline bool apply(Box1 const&, Box2 const&,
  83             RobustPolicy const&, BoxOut&, Strategy const&)
  84     {
  85         return true;
  86     }
  87 };
  88
  89
  90 }} // namespace detail::intersection
  91 #endif // DOXYGEN_NO_DETAIL
  92
  93 }} // namespace boost::geometry
  94
  95
  96 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP