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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 |