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
26namespace boost { namespace geometry
27{
28
29
30#ifndef DOXYGEN_NO_DISPATCH
31namespace core_dispatch
32{
33
34template <typename GeometryTag>
35struct geometry_id
36{
37 BOOST_MPL_ASSERT_MSG
38 (
39 false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
40 , (types<GeometryTag>)
41 );
42};
43
44
45template <>
46struct geometry_id<point_tag> : boost::mpl::int_<1> {};
47
48
49template <>
50struct geometry_id<linestring_tag> : boost::mpl::int_<2> {};
51
52
53template <>
54struct geometry_id<polygon_tag> : boost::mpl::int_<3> {};
55
56
57template <>
58struct geometry_id<multi_point_tag> : boost::mpl::int_<4> {};
59
60
61template <>
62struct geometry_id<multi_linestring_tag> : boost::mpl::int_<5> {};
63
64
65template <>
66struct geometry_id<multi_polygon_tag> : boost::mpl::int_<6> {};
67
68
69template <>
70struct geometry_id<segment_tag> : boost::mpl::int_<92> {};
71
72
73template <>
74struct geometry_id<ring_tag> : boost::mpl::int_<93> {};
75
76
77template <>
78struct 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*/
95template <typename Geometry>
96struct 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

source code of boost/boost/geometry/core/geometry_id.hpp