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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_EXTERIOR_RING_HPP | |
16 | #define BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP | |
17 | ||
18 | ||
19 | #include <boost/mpl/assert.hpp> | |
20 | #include <boost/type_traits/is_const.hpp> | |
21 | #include <boost/type_traits/remove_const.hpp> | |
22 | ||
23 | ||
24 | #include <boost/geometry/core/ring_type.hpp> | |
25 | #include <boost/geometry/core/tag.hpp> | |
26 | #include <boost/geometry/core/tags.hpp> | |
27 | #include <boost/geometry/util/add_const_if_c.hpp> | |
28 | ||
29 | ||
30 | namespace boost { namespace geometry | |
31 | { | |
32 | ||
33 | namespace traits | |
34 | { | |
35 | ||
36 | ||
37 | /*! | |
38 | \brief Traits class defining access to exterior_ring of a polygon | |
39 | \details Should define const and non const access | |
40 | \ingroup traits | |
41 | \tparam Polygon the polygon type | |
42 | \par Geometries: | |
43 | - polygon | |
44 | \par Specializations should provide: | |
45 | - static inline RING& get(POLY& ) | |
46 | - static inline RING const& get(POLY const& ) | |
47 | */ | |
48 | template <typename Polygon> | |
49 | struct exterior_ring | |
50 | { | |
51 | BOOST_MPL_ASSERT_MSG | |
52 | ( | |
53 | false, NOT_IMPLEMENTED_FOR_THIS_POLYGON_TYPE | |
54 | , (types<Polygon>) | |
55 | ); | |
56 | }; | |
57 | ||
58 | ||
59 | } // namespace traits | |
60 | ||
61 | ||
62 | #ifndef DOXYGEN_NO_DISPATCH | |
63 | namespace core_dispatch | |
64 | { | |
65 | ||
66 | ||
67 | template <typename Tag, typename Geometry> | |
68 | struct exterior_ring | |
69 | { | |
70 | BOOST_MPL_ASSERT_MSG | |
71 | ( | |
72 | false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE | |
73 | , (types<Geometry>) | |
74 | ); | |
75 | }; | |
76 | ||
77 | ||
78 | template <typename Polygon> | |
79 | struct exterior_ring<polygon_tag, Polygon> | |
80 | { | |
81 | static | |
82 | typename geometry::ring_return_type<Polygon>::type | |
83 | apply(typename add_const_if_c | |
84 | < | |
85 | boost::is_const<Polygon>::type::value, | |
86 | Polygon | |
87 | >::type& polygon) | |
88 | { | |
89 | return traits::exterior_ring | |
90 | < | |
91 | typename boost::remove_const<Polygon>::type | |
92 | >::get(polygon); | |
93 | } | |
94 | }; | |
95 | ||
96 | ||
97 | } // namespace core_dispatch | |
98 | #endif // DOXYGEN_NO_DISPATCH | |
99 | ||
100 | ||
101 | /*! | |
102 | \brief Function to get the exterior_ring ring of a polygon | |
103 | \ingroup exterior_ring | |
104 | \note OGC compliance: instead of ExteriorRing | |
105 | \tparam Polygon polygon type | |
106 | \param polygon the polygon to get the exterior ring from | |
107 | \return a reference to the exterior ring | |
108 | */ | |
109 | template <typename Polygon> | |
110 | inline typename ring_return_type<Polygon>::type exterior_ring(Polygon& polygon) | |
111 | { | |
112 | return core_dispatch::exterior_ring | |
113 | < | |
114 | typename tag<Polygon>::type, | |
115 | Polygon | |
116 | >::apply(polygon); | |
117 | } | |
118 | ||
119 | ||
120 | /*! | |
121 | \brief Function to get the exterior ring of a polygon (const version) | |
122 | \ingroup exterior_ring | |
123 | \note OGC compliance: instead of ExteriorRing | |
124 | \tparam Polygon polygon type | |
125 | \param polygon the polygon to get the exterior ring from | |
126 | \return a const reference to the exterior ring | |
127 | ||
128 | \qbk{distinguish,const version} | |
129 | */ | |
130 | template <typename Polygon> | |
131 | inline typename ring_return_type<Polygon const>::type exterior_ring( | |
132 | Polygon const& polygon) | |
133 | { | |
134 | return core_dispatch::exterior_ring | |
135 | < | |
136 | typename tag<Polygon>::type, | |
137 | Polygon const | |
138 | >::apply(polygon); | |
139 | } | |
140 | ||
141 | ||
142 | }} // namespace boost::geometry | |
143 | ||
144 | ||
145 | #endif // BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP |