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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2015 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2015 Mateusz Loskot, London, UK. | |
6 | ||
7 | // This file was modified by Oracle on 2015. | |
8 | // Modifications copyright (c) 2015, Oracle and/or its affiliates. | |
9 | ||
10 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
11 | ||
12 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
13 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
14 | ||
15 | // Use, modification and distribution is subject to the Boost Software License, | |
16 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
17 | // http://www.boost.org/LICENSE_1_0.txt) | |
18 | ||
19 | ||
20 | #ifndef BOOST_GEOMETRY_CORE_RING_TYPE_HPP | |
21 | #define BOOST_GEOMETRY_CORE_RING_TYPE_HPP | |
22 | ||
23 | ||
24 | #include <boost/mpl/assert.hpp> | |
25 | #include <boost/mpl/if.hpp> | |
26 | #include <boost/range/value_type.hpp> | |
27 | #include <boost/type_traits/is_const.hpp> | |
28 | #include <boost/type_traits/remove_const.hpp> | |
29 | #include <boost/type_traits/remove_reference.hpp> | |
30 | ||
31 | #include <boost/geometry/core/tag.hpp> | |
32 | #include <boost/geometry/core/tags.hpp> | |
33 | ||
34 | ||
35 | namespace boost { namespace geometry | |
36 | { | |
37 | ||
38 | namespace traits | |
39 | { | |
40 | ||
41 | ||
42 | /*! | |
43 | \brief Traits class to indicate ring-type of a polygon's exterior ring/interior rings | |
44 | \ingroup traits | |
45 | \par Geometries: | |
46 | - polygon | |
47 | \par Specializations should provide: | |
48 | - typedef XXX type ( e.g. ring<P> ) | |
49 | \tparam Geometry geometry | |
50 | */ | |
51 | template <typename Geometry> | |
52 | struct ring_const_type | |
53 | { | |
54 | BOOST_MPL_ASSERT_MSG | |
55 | ( | |
56 | false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE | |
57 | , (types<Geometry>) | |
58 | ); | |
59 | }; | |
60 | ||
61 | template <typename Geometry> | |
62 | struct ring_mutable_type | |
63 | { | |
64 | BOOST_MPL_ASSERT_MSG | |
65 | ( | |
66 | false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE | |
67 | , (types<Geometry>) | |
68 | ); | |
69 | }; | |
70 | ||
71 | ||
72 | } // namespace traits | |
73 | ||
74 | ||
75 | #ifndef DOXYGEN_NO_DISPATCH | |
76 | namespace core_dispatch | |
77 | { | |
78 | ||
79 | template <typename GeometryTag, typename Geometry> | |
80 | struct ring_return_type | |
81 | {}; | |
82 | ||
83 | ||
84 | template <typename LineString> | |
85 | struct ring_return_type<linestring_tag, LineString> | |
86 | { | |
87 | typedef LineString& type; | |
88 | }; | |
89 | ||
90 | ||
91 | template <typename Ring> | |
92 | struct ring_return_type<ring_tag, Ring> | |
93 | { | |
94 | typedef Ring& type; | |
95 | }; | |
96 | ||
97 | ||
98 | template <typename Polygon> | |
99 | struct ring_return_type<polygon_tag, Polygon> | |
100 | { | |
101 | typedef typename boost::remove_const<Polygon>::type nc_polygon_type; | |
102 | ||
103 | typedef typename boost::mpl::if_ | |
104 | < | |
105 | boost::is_const<Polygon>, | |
106 | typename traits::ring_const_type<nc_polygon_type>::type, | |
107 | typename traits::ring_mutable_type<nc_polygon_type>::type | |
108 | >::type type; | |
109 | }; | |
110 | ||
111 | ||
112 | template <typename MultiLinestring> | |
113 | struct ring_return_type<multi_linestring_tag, MultiLinestring> | |
114 | { | |
115 | typedef typename ring_return_type | |
116 | < | |
117 | linestring_tag, | |
118 | typename boost::mpl::if_ | |
119 | < | |
120 | boost::is_const<MultiLinestring>, | |
121 | typename boost::range_value<MultiLinestring>::type const, | |
122 | typename boost::range_value<MultiLinestring>::type | |
123 | >::type | |
124 | >::type type; | |
125 | }; | |
126 | ||
127 | ||
128 | template <typename MultiPolygon> | |
129 | struct ring_return_type<multi_polygon_tag, MultiPolygon> | |
130 | { | |
131 | typedef typename ring_return_type | |
132 | < | |
133 | polygon_tag, | |
134 | typename boost::mpl::if_ | |
135 | < | |
136 | boost::is_const<MultiPolygon>, | |
137 | typename boost::range_value<MultiPolygon>::type const, | |
138 | typename boost::range_value<MultiPolygon>::type | |
139 | >::type | |
140 | >::type type; | |
141 | }; | |
142 | ||
143 | ||
144 | template <typename GeometryTag, typename Geometry> | |
145 | struct ring_type | |
146 | {}; | |
147 | ||
148 | ||
149 | template <typename Ring> | |
150 | struct ring_type<ring_tag, Ring> | |
151 | { | |
152 | typedef Ring type; | |
153 | }; | |
154 | ||
155 | ||
156 | template <typename Polygon> | |
157 | struct ring_type<polygon_tag, Polygon> | |
158 | { | |
159 | typedef typename boost::remove_reference | |
160 | < | |
161 | typename ring_return_type<polygon_tag, Polygon>::type | |
162 | >::type type; | |
163 | }; | |
164 | ||
165 | ||
166 | template <typename MultiLinestring> | |
167 | struct ring_type<multi_linestring_tag, MultiLinestring> | |
168 | { | |
169 | typedef typename boost::remove_reference | |
170 | < | |
171 | typename ring_return_type<multi_linestring_tag, MultiLinestring>::type | |
172 | >::type type; | |
173 | }; | |
174 | ||
175 | ||
176 | template <typename MultiPolygon> | |
177 | struct ring_type<multi_polygon_tag, MultiPolygon> | |
178 | { | |
179 | typedef typename boost::remove_reference | |
180 | < | |
181 | typename ring_return_type<multi_polygon_tag, MultiPolygon>::type | |
182 | >::type type; | |
183 | }; | |
184 | ||
185 | ||
186 | } // namespace core_dispatch | |
187 | #endif | |
188 | ||
189 | ||
190 | /*! | |
191 | \brief \brief_meta{type, ring_type, \meta_geometry_type} | |
192 | \details A polygon contains one exterior ring | |
193 | and zero or more interior rings (holes). | |
194 | This metafunction retrieves the type of the rings. | |
195 | Exterior ring and each of the interior rings all have the same ring_type. | |
196 | \tparam Geometry A type fullfilling the Ring, Polygon or MultiPolygon concept. | |
197 | \ingroup core | |
198 | ||
199 | \qbk{[include reference/core/ring_type.qbk]} | |
200 | */ | |
201 | template <typename Geometry> | |
202 | struct ring_type | |
203 | { | |
204 | typedef typename core_dispatch::ring_type | |
205 | < | |
206 | typename tag<Geometry>::type, | |
207 | Geometry | |
208 | >::type type; | |
209 | }; | |
210 | ||
211 | ||
212 | template <typename Geometry> | |
213 | struct ring_return_type | |
214 | { | |
215 | typedef typename core_dispatch::ring_return_type | |
216 | < | |
217 | typename tag<Geometry>::type, | |
218 | Geometry | |
219 | >::type type; | |
220 | }; | |
221 | ||
222 | ||
223 | }} // namespace boost::geometry | |
224 | ||
225 | ||
226 | #endif // BOOST_GEOMETRY_CORE_RING_TYPE_HPP |