1 // Boost.Geometry (aka GGL, Generic Geometry Library) 2 3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. 4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. 5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. 6 7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library 8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. 9 10 // Use, modification and distribution is subject to the Boost Software License, 11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 12 // http://www.boost.org/LICENSE_1_0.txt) 13 14 15 #ifndef BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP 16 #define BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP 17 18 19 #include <boost/mpl/assert.hpp> 20 #include <boost/mpl/int.hpp> 21 22 #include <boost/geometry/core/tag.hpp> 23 #include <boost/geometry/core/tags.hpp> 24 25 26 namespace boost { namespace geometry 27 { 28 29 30 #ifndef DOXYGEN_NO_DISPATCH 31 namespace core_dispatch 32 { 33 34 template <typename GeometryTag> 35 struct geometry_id 36 { 37 BOOST_MPL_ASSERT_MSG 38 ( 39 false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE 40 , (types<GeometryTag>) 41 ); 42 }; 43 44 45 template <> 46 struct geometry_id<point_tag> : boost::mpl::int_<1> {}; 47 48 49 template <> 50 struct geometry_id<linestring_tag> : boost::mpl::int_<2> {}; 51 52 53 template <> 54 struct geometry_id<polygon_tag> : boost::mpl::int_<3> {}; 55 56 57 template <> 58 struct geometry_id<multi_point_tag> : boost::mpl::int_<4> {}; 59 60 61 template <> 62 struct geometry_id<multi_linestring_tag> : boost::mpl::int_<5> {}; 63 64 65 template <> 66 struct geometry_id<multi_polygon_tag> : boost::mpl::int_<6> {}; 67 68 69 template <> 70 struct geometry_id<segment_tag> : boost::mpl::int_<92> {}; 71 72 73 template <> 74 struct geometry_id<ring_tag> : boost::mpl::int_<93> {}; 75 76 77 template <> 78 struct geometry_id<box_tag> : boost::mpl::int_<94> {}; 79 80 81 } // namespace core_dispatch 82 #endif 83 84 85 86 /*! 87 \brief Meta-function returning the id of a geometry type 88 \details The meta-function geometry_id defines a numerical ID (based on 89 boost::mpl::int_<...> ) for each geometry concept. A numerical ID is 90 sometimes useful, and within Boost.Geometry it is used for the 91 reverse_dispatch metafuntion. 92 \note Used for e.g. reverse meta-function 93 \ingroup core 94 */ 95 template <typename Geometry> 96 struct geometry_id : core_dispatch::geometry_id<typename tag<Geometry>::type> 97 {}; 98 99 100 }} // namespace boost::geometry 101 102 103 #endif // BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP 104