1 files changed, 98 insertions, 0 deletions
diff --git a/boost/geometry/algorithms/detail/buffer/turn_in_input.hpp b/boost/geometry/algorithms/detail/buffer/turn_in_input.hpp
new file mode 100644
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+++ b/boost/geometry/algorithms/detail/buffer/turn_in_input.hpp
@@ -0,0 +1,98 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2012-2014 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_BUFFER_TURN_IN_INPUT_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_TURN_IN_INPUT_HPP
+
+#include <boost/geometry/core/tags.hpp>
+#include <boost/geometry/algorithms/covered_by.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace buffer
+{
+
+// Checks if an turn/intersection point is inside (or covered by) the input geometry
+
+template <typename Tag>
+struct turn_in_input
+{
+};
+
+template <>
+struct turn_in_input<polygon_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& point, Geometry const& geometry)
+    {
+        return geometry::covered_by(point, geometry) ? 1 : -1;
+    }
+};
+
+template <>
+struct turn_in_input<linestring_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& , Geometry const& )
+    {
+        return 0;
+    }
+};
+
+template <>
+struct turn_in_input<point_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& , Geometry const& )
+    {
+        return 0;
+    }
+};
+
+template <>
+struct turn_in_input<multi_polygon_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& point, Geometry const& geometry)
+    {
+        return geometry::covered_by(point, geometry) ? 1 : -1;
+    }
+};
+
+template <>
+struct turn_in_input<multi_linestring_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& , Geometry const& )
+    {
+        return 0;
+    }
+};
+
+template <>
+struct turn_in_input<multi_point_tag>
+{
+    template <typename Point, typename Geometry>
+    static inline int apply(Point const& , Geometry const& )
+    {
+        return 0;
+    }
+};
+
+
+}} // namespace detail::buffer
+#endif // DOXYGEN_NO_DETAIL
+
+
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_TURN_IN_INPUT_HPP