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diff --git a/boost/geometry/core/geometry_id.hpp b/boost/geometry/core/geometry_id.hpp
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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// 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_CORE_GEOMETRY_ID_HPP
+#define BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP
+
+
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/type_traits.hpp>
+
+
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace core_dispatch
+{
+
+template <typename GeometryTag>
+struct geometry_id
+{
+    BOOST_MPL_ASSERT_MSG
+        (
+            false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
+            , (types<GeometryTag>)
+        );
+};
+
+
+template <>
+struct geometry_id<point_tag>      : boost::mpl::int_<1> {};
+
+
+template <>
+struct geometry_id<linestring_tag> : boost::mpl::int_<2> {};
+
+
+template <>
+struct geometry_id<polygon_tag>    : boost::mpl::int_<3> {};
+
+
+template <>
+struct geometry_id<segment_tag>    : boost::mpl::int_<92> {};
+
+
+template <>
+struct geometry_id<ring_tag>       : boost::mpl::int_<93> {};
+
+
+template <>
+struct geometry_id<box_tag>        : boost::mpl::int_<94> {};
+
+
+
+} // namespace core_dispatch
+#endif
+
+
+
+/*!
+\brief Meta-function returning the id of a geometry type
+\details The meta-function geometry_id defines a numerical ID (based on 
+    boost::mpl::int_<...> ) for each geometry concept. A numerical ID is 
+    sometimes useful, and within Boost.Geometry it is used for the 
+    reverse_dispatch metafuntion.
+\note Used for e.g. reverse meta-function
+\ingroup core
+*/
+template <typename Geometry>
+struct geometry_id : core_dispatch::geometry_id<typename tag<Geometry>::type>
+{};
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP