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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
+
+// This file was modified by Oracle on 2015.
+// Modifications copyright (c) 2015, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Menelaos Karavelas, 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.
+
+// Distributed under 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_ENVELOPE_IMPLEMENTATION_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_IMPLEMENTATION_HPP
+
+#include <boost/geometry/core/exterior_ring.hpp>
+#include <boost/geometry/core/interior_rings.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+#include <boost/geometry/algorithms/is_empty.hpp>
+
+#include <boost/geometry/algorithms/detail/envelope/box.hpp>
+#include <boost/geometry/algorithms/detail/envelope/linear.hpp>
+#include <boost/geometry/algorithms/detail/envelope/multipoint.hpp>
+#include <boost/geometry/algorithms/detail/envelope/point.hpp>
+#include <boost/geometry/algorithms/detail/envelope/range.hpp>
+#include <boost/geometry/algorithms/detail/envelope/segment.hpp>
+
+#include <boost/geometry/algorithms/dispatch/envelope.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace envelope
+{
+
+
+struct envelope_polygon
+{
+    template <typename Polygon, typename Box>
+    static inline void apply(Polygon const& polygon, Box& mbr)
+    {
+        typename ring_return_type<Polygon const>::type ext_ring
+            = exterior_ring(polygon);
+
+        if (geometry::is_empty(ext_ring))
+        {
+            // if the exterior ring is empty, consider the interior rings
+            envelope_multi_range
+                <
+                    envelope_range
+                >::apply(interior_rings(polygon), mbr);
+        }
+        else
+        {
+            // otherwise, consider only the exterior ring
+            envelope_range::apply(ext_ring, mbr);
+        }
+    }
+};
+
+
+}} // namespace detail::envelope
+#endif // DOXYGEN_NO_DETAIL
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace dispatch
+{
+
+
+template <typename Ring>
+struct envelope<Ring, ring_tag>
+    : detail::envelope::envelope_range
+{};
+
+
+template <typename Polygon>
+struct envelope<Polygon, polygon_tag>
+    : detail::envelope::envelope_polygon
+{};
+
+
+template <typename MultiPolygon>
+struct envelope<MultiPolygon, multi_polygon_tag>
+    : detail::envelope::envelope_multi_range
+        <
+            detail::envelope::envelope_polygon
+        >
+{};
+
+
+} // namespace dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_IMPLEMENTATION_HPP