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[ceph.git] / ceph / src / boost / boost / geometry / algorithms / detail / overlay / get_ring.hpp

diff --git a/ceph/src/boost/boost/geometry/algorithms/detail/overlay/get_ring.hpp b/ceph/src/boost/boost/geometry/algorithms/detail/overlay/get_ring.hpp
index 460c30def3abc2c26dcc961a2f6b09a9e8ad872a..07e984b194264ce8d688c91b8f31f88967125e71 100644 (file)
--- a/ceph/src/boost/boost/geometry/algorithms/detail/overlay/get_ring.hpp
+++ b/ceph/src/boost/boost/geometry/algorithms/detail/overlay/get_ring.hpp
@@ -18,6 +18,8 @@
 #include <boost/geometry/core/ring_type.hpp>
 #include <boost/geometry/core/tags.hpp>
 #include <boost/geometry/algorithms/detail/ring_identifier.hpp>
+#include <boost/geometry/algorithms/detail/overlay/segment_identifier.hpp>
+#include <boost/geometry/algorithms/num_points.hpp>
 #include <boost/geometry/geometries/concepts/check.hpp>
 #include <boost/geometry/util/range.hpp>
 
@@ -49,8 +51,6 @@ struct get_ring<void>
 };
 
 
-
-
 template<>
 struct get_ring<ring_tag>
 {
@@ -113,6 +113,17 @@ struct get_ring<multi_polygon_tag>
 };
 
 
+template <typename Geometry>
+inline std::size_t segment_count_on_ring(Geometry const& geometry,
+                                         segment_identifier const& seg_id)
+{
+    typedef typename geometry::tag<Geometry>::type tag;
+    ring_identifier const rid(0, seg_id.multi_index, seg_id.ring_index);
+    // A closed polygon, a triangle of 4 points, including starting point,
+    // contains 3 segments. So handle as if closed and subtract one.
+    return geometry::num_points(detail::overlay::get_ring<tag>::apply(rid, geometry), true) - 1;
+}
+
 }} // namespace detail::overlay
 #endif // DOXYGEN_NO_DETAIL