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
27namespace boost { namespace geometry
28{
29
30namespace 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*/
42template <typename Geometry>
43struct 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
56namespace core_dispatch
57{
58
59template <typename Tag, typename Geometry>
60struct 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
71template <typename Point>
72struct point_type<point_tag, Point>
73{
74 typedef Point type;
75};
76
77
78// Specializations for linestring/ring, via boost::range
79template <typename Linestring>
80struct point_type<linestring_tag, Linestring>
81{
82 typedef typename boost::range_value<Linestring>::type type;
83};
84
85
86template <typename Ring>
87struct 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
94template <typename Polygon>
95struct 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
105template <typename MultiPoint>
106struct point_type<multi_point_tag, MultiPoint>
107{
108 typedef typename boost::range_value
109 <
110 MultiPoint
111 >::type type;
112};
113
114
115template <typename MultiLinestring>
116struct 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
126template <typename MultiPolygon>
127struct 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*/
148template <typename Geometry>
149struct 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
163

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