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diff --git a/boost/polygon/voronoi_geometry_type.hpp b/boost/polygon/voronoi_geometry_type.hpp
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+++ b/boost/polygon/voronoi_geometry_type.hpp
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+// Boost.Polygon library voronoi_geometry_type.hpp header file
+
+//          Copyright Andrii Sydorchuk 2010-2012.
+// 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)
+
+// See http://www.boost.org for updates, documentation, and revision history.
+
+#ifndef BOOST_POLYGON_VORONOI_GEOMETRY_TYPE
+#define BOOST_POLYGON_VORONOI_GEOMETRY_TYPE
+
+#include <cstddef>
+
+namespace boost {
+namespace polygon {
+// Represents topology type of the voronoi site.
+enum GeometryCategory {
+  GEOMETRY_CATEGORY_POINT = 0x0,
+  GEOMETRY_CATEGORY_SEGMENT = 0x1
+};
+
+// Represents category of the input source that forms Voronoi cell.
+enum SourceCategory {
+  // Point subtypes.
+  SOURCE_CATEGORY_SINGLE_POINT = 0x0,
+  SOURCE_CATEGORY_SEGMENT_START_POINT = 0x1,
+  SOURCE_CATEGORY_SEGMENT_END_POINT = 0x2,
+
+  // Segment subtypes.
+  SOURCE_CATEGORY_INITIAL_SEGMENT = 0x8,
+  SOURCE_CATEGORY_REVERSE_SEGMENT = 0x9,
+
+  SOURCE_CATEGORY_GEOMETRY_SHIFT = 0x3,
+  SOURCE_CATEGORY_BITMASK = 0x1F
+};
+
+inline bool belongs(
+    SourceCategory source_category,
+    GeometryCategory geometry_category) {
+  return (static_cast<std::size_t>(source_category) >>
+              SOURCE_CATEGORY_GEOMETRY_SHIFT) ==
+         static_cast<std::size_t>(geometry_category);
+}
+}  // polygon
+}  // boost
+
+#endif  // BOOST_POLYGON_VORONOI_GEOMETRY_TYPE