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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
+
+// This file was modified by Oracle on 2013-2017.
+// Modifications copyright (c) 2013-2017, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, 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_INTERSECTS_IMPLEMENTATION_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_INTERSECTS_IMPLEMENTATION_HPP
+
+
+#include <deque>
+
+#include <boost/geometry/algorithms/detail/intersects/interface.hpp>
+#include <boost/geometry/algorithms/detail/disjoint/implementation.hpp>
+
+#include <boost/geometry/algorithms/detail/overlay/self_turn_points.hpp>
+#include <boost/geometry/policies/disjoint_interrupt_policy.hpp>
+#include <boost/geometry/policies/robustness/no_rescale_policy.hpp>
+#include <boost/geometry/policies/robustness/segment_ratio_type.hpp>
+
+#include <boost/geometry/strategies/relate.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace intersects
+{
+
+template <typename Geometry>
+struct self_intersects
+{
+    static bool apply(Geometry const& geometry)
+    {
+        concepts::check<Geometry const>();
+
+        typedef typename geometry::point_type<Geometry>::type point_type;
+        typedef typename strategy::relate::services::default_strategy
+                <
+                    Geometry, Geometry
+                >::type strategy_type;
+        typedef detail::no_rescale_policy rescale_policy_type;
+
+        typedef detail::overlay::turn_info
+            <
+                point_type,
+                typename segment_ratio_type<point_type, rescale_policy_type>::type
+            > turn_info;
+
+        std::deque<turn_info> turns;
+
+        typedef detail::overlay::get_turn_info
+            <
+                detail::overlay::assign_null_policy
+            > turn_policy;
+
+        strategy_type strategy;
+        rescale_policy_type robust_policy;
+
+        detail::disjoint::disjoint_interrupt_policy policy;
+        detail::self_get_turn_points::get_turns
+            <
+                false, turn_policy
+            >::apply(geometry, strategy, robust_policy, turns, policy, 0);
+        return policy.has_intersections;
+    }
+};
+
+}} // namespace detail::intersects
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_INTERSECTS_IMPLEMENTATION_HPP