Imported Upstream version 1.65.0upstream/1.65.0

Change-Id: Icf8400b375482cb11bcf77440a6934ba360d6ba4
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp b/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp
new file mode 100644
index 0000000000..9cb7a0fca9
--- /dev/null
+++ b/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp
@@ -0,0 +1,68 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2017-2017 Barend Gehrels, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP
+
+#include <boost/geometry/algorithms/detail/overlay/overlay_type.hpp>
+
+namespace boost { namespace geometry
+{
+
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace overlay
+{
+
+template <overlay_type OverlayType>
+struct is_self_turn_check
+{
+    template <typename Turn>
+    static inline bool apply(Turn const& turn)
+    {
+        return turn.operations[0].seg_id.source_index
+                == turn.operations[1].seg_id.source_index;
+    }
+};
+
+template <>
+struct is_self_turn_check<overlay_buffer>
+{
+    template <typename Turn>
+    static inline bool apply(Turn const& turn)
+    {
+        return false;
+    }
+};
+
+template <>
+struct is_self_turn_check<overlay_dissolve>
+{
+    template <typename Turn>
+    static inline bool apply(Turn const& turn)
+    {
+        return false;
+    }
+};
+
+
+template <overlay_type OverlayType, typename Turn>
+bool is_self_turn(Turn const& turn)
+{
+    return is_self_turn_check<OverlayType>::apply(turn);
+}
+
+
+}} // namespace detail::overlay
+#endif // DOXYGEN_NO_DETAIL
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP