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 | |