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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 | #ifndef BOOST_GEOMETRY_CORE_POINT_TYPE_HPP | |
15 | #define BOOST_GEOMETRY_CORE_POINT_TYPE_HPP | |
16 | ||
17 | ||
18 | #include <boost/mpl/assert.hpp> | |
19 | #include <boost/range/value_type.hpp> | |
20 | #include <boost/type_traits/remove_const.hpp> | |
21 | ||
22 | #include <boost/geometry/core/ring_type.hpp> | |
23 | #include <boost/geometry/core/tag.hpp> | |
24 | #include <boost/geometry/core/tags.hpp> | |
25 | #include <boost/geometry/util/bare_type.hpp> | |
26 | ||
27 | namespace boost { namespace geometry | |
28 | { | |
29 | ||
30 | namespace traits | |
31 | { | |
32 | ||
33 | /*! | |
34 | \brief Traits class indicating the type of contained points | |
35 | \ingroup traits | |
36 | \par Geometries: | |
37 | - all geometries except point | |
38 | \par Specializations should provide: | |
39 | - typedef P type (where P should fulfil the Point concept) | |
40 | \tparam Geometry geometry | |
41 | */ | |
42 | template <typename Geometry> | |
43 | struct point_type | |
44 | { | |
45 | BOOST_MPL_ASSERT_MSG | |
46 | ( | |
47 | false, NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE, (types<Geometry>) | |
48 | ); | |
49 | }; | |
50 | ||
51 | ||
52 | } // namespace traits | |
53 | ||
54 | ||
55 | #ifndef DOXYGEN_NO_DISPATCH | |
56 | namespace core_dispatch | |
57 | { | |
58 | ||
59 | template <typename Tag, typename Geometry> | |
60 | struct point_type | |
61 | { | |
62 | // Default: call traits to get point type | |
63 | typedef typename boost::remove_const | |
64 | < | |
65 | typename traits::point_type<Geometry>::type | |
66 | >::type type; | |
67 | }; | |
68 | ||
69 | ||
70 | // Specialization for point: the point itself | |
71 | template <typename Point> | |
72 | struct point_type<point_tag, Point> | |
73 | { | |
74 | typedef Point type; | |
75 | }; | |
76 | ||
77 | ||
78 | // Specializations for linestring/ring, via boost::range | |
79 | template <typename Linestring> | |
80 | struct point_type<linestring_tag, Linestring> | |
81 | { | |
82 | typedef typename boost::range_value<Linestring>::type type; | |
83 | }; | |
84 | ||
85 | ||
86 | template <typename Ring> | |
87 | struct point_type<ring_tag, Ring> | |
88 | { | |
89 | typedef typename boost::range_value<Ring>::type type; | |
90 | }; | |
91 | ||
92 | ||
93 | // Specialization for polygon: the point-type is the point-type of its rings | |
94 | template <typename Polygon> | |
95 | struct point_type<polygon_tag, Polygon> | |
96 | { | |
97 | typedef typename point_type | |
98 | < | |
99 | ring_tag, | |
100 | typename ring_type<polygon_tag, Polygon>::type | |
101 | >::type type; | |
102 | }; | |
103 | ||
104 | ||
105 | template <typename MultiPoint> | |
106 | struct point_type<multi_point_tag, MultiPoint> | |
107 | { | |
108 | typedef typename boost::range_value | |
109 | < | |
110 | MultiPoint | |
111 | >::type type; | |
112 | }; | |
113 | ||
114 | ||
115 | template <typename MultiLinestring> | |
116 | struct point_type<multi_linestring_tag, MultiLinestring> | |
117 | { | |
118 | typedef typename point_type | |
119 | < | |
120 | linestring_tag, | |
121 | typename boost::range_value<MultiLinestring>::type | |
122 | >::type type; | |
123 | }; | |
124 | ||
125 | ||
126 | template <typename MultiPolygon> | |
127 | struct point_type<multi_polygon_tag, MultiPolygon> | |
128 | { | |
129 | typedef typename point_type | |
130 | < | |
131 | polygon_tag, | |
132 | typename boost::range_value<MultiPolygon>::type | |
133 | >::type type; | |
134 | }; | |
135 | ||
136 | ||
137 | } // namespace core_dispatch | |
138 | #endif // DOXYGEN_NO_DISPATCH | |
139 | ||
140 | ||
141 | /*! | |
142 | \brief \brief_meta{type, point_type, \meta_geometry_type} | |
143 | \tparam Geometry \tparam_geometry | |
144 | \ingroup core | |
145 | ||
146 | \qbk{[include reference/core/point_type.qbk]} | |
147 | */ | |
148 | template <typename Geometry> | |
149 | struct point_type | |
150 | { | |
151 | typedef typename core_dispatch::point_type | |
152 | < | |
153 | typename tag<Geometry>::type, | |
154 | typename boost::geometry::util::bare_type<Geometry>::type | |
155 | >::type type; | |
156 | }; | |
157 | ||
158 | ||
159 | }} // namespace boost::geometry | |
160 | ||
161 | ||
162 | #endif // BOOST_GEOMETRY_CORE_POINT_TYPE_HPP |