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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2014 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2014 Mateusz Loskot, London, UK. | |
6 | ||
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7 | // This file was modified by Oracle on 2014-2020. |
8 | // Modifications copyright (c) 2014-2020, Oracle and/or its affiliates. | |
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9 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle |
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 | #ifndef BOOST_GEOMETRY_ALGORITHMS_NUM_INTERIOR_RINGS_HPP | |
20 | #define BOOST_GEOMETRY_ALGORITHMS_NUM_INTERIOR_RINGS_HPP | |
21 | ||
22 | #include <cstddef> | |
23 | ||
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24 | #include <boost/range/size.hpp> |
25 | #include <boost/range/value_type.hpp> | |
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26 | |
27 | #include <boost/variant/apply_visitor.hpp> | |
28 | #include <boost/variant/static_visitor.hpp> | |
29 | #include <boost/variant/variant_fwd.hpp> | |
30 | ||
31 | #include <boost/geometry/core/tag.hpp> | |
32 | #include <boost/geometry/core/tags.hpp> | |
33 | ||
34 | #include <boost/geometry/core/interior_rings.hpp> | |
35 | ||
36 | #include <boost/geometry/algorithms/detail/counting.hpp> | |
37 | ||
38 | #include <boost/geometry/geometries/concepts/check.hpp> | |
39 | ||
40 | ||
41 | namespace boost { namespace geometry | |
42 | { | |
43 | ||
44 | #ifndef DOXYGEN_NO_DISPATCH | |
45 | namespace dispatch | |
46 | { | |
47 | ||
48 | ||
49 | template <typename Geometry, typename Tag = typename tag<Geometry>::type> | |
50 | struct num_interior_rings | |
51 | : detail::counting::other_count<0> | |
52 | {}; | |
53 | ||
54 | ||
55 | ||
56 | template <typename Polygon> | |
57 | struct num_interior_rings<Polygon, polygon_tag> | |
58 | { | |
59 | static inline std::size_t apply(Polygon const& polygon) | |
60 | { | |
61 | return boost::size(geometry::interior_rings(polygon)); | |
62 | } | |
63 | ||
64 | }; | |
65 | ||
66 | ||
67 | template <typename MultiPolygon> | |
68 | struct num_interior_rings<MultiPolygon, multi_polygon_tag> | |
69 | : detail::counting::multi_count | |
70 | < | |
71 | num_interior_rings | |
72 | < | |
73 | typename boost::range_value<MultiPolygon const>::type | |
74 | > | |
75 | > | |
76 | {}; | |
77 | ||
78 | ||
79 | } // namespace dispatch | |
80 | #endif // DOXYGEN_NO_DISPATCH | |
81 | ||
82 | ||
83 | namespace resolve_variant | |
84 | { | |
85 | ||
86 | template <typename Geometry> | |
87 | struct num_interior_rings | |
88 | { | |
89 | static inline std::size_t apply(Geometry const& geometry) | |
90 | { | |
91 | concepts::check<Geometry const>(); | |
92 | ||
93 | return dispatch::num_interior_rings<Geometry>::apply(geometry); | |
94 | } | |
95 | }; | |
96 | ||
97 | template <BOOST_VARIANT_ENUM_PARAMS(typename T)> | |
98 | struct num_interior_rings<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > | |
99 | { | |
100 | struct visitor: boost::static_visitor<std::size_t> | |
101 | { | |
102 | template <typename Geometry> | |
103 | inline std::size_t operator()(Geometry const& geometry) const | |
104 | { | |
105 | return num_interior_rings<Geometry>::apply(geometry); | |
106 | } | |
107 | }; | |
108 | ||
109 | static inline std::size_t | |
110 | apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry) | |
111 | { | |
112 | return boost::apply_visitor(visitor(), geometry); | |
113 | } | |
114 | }; | |
115 | ||
116 | } // namespace resolve_variant | |
117 | ||
118 | ||
119 | /*! | |
120 | \brief \brief_calc{number of interior rings} | |
121 | \ingroup num_interior_rings | |
122 | \details \details_calc{num_interior_rings, number of interior rings}. | |
123 | \tparam Geometry \tparam_geometry | |
124 | \param geometry \param_geometry | |
125 | \return \return_calc{number of interior rings} | |
126 | ||
127 | \qbk{[include reference/algorithms/num_interior_rings.qbk]} | |
128 | ||
129 | \note Defined by OGC as "numInteriorRing". To be consistent with "numPoints" | |
130 | letter "s" is appended | |
131 | */ | |
132 | template <typename Geometry> | |
133 | inline std::size_t num_interior_rings(Geometry const& geometry) | |
134 | { | |
135 | return resolve_variant::num_interior_rings<Geometry>::apply(geometry); | |
136 | } | |
137 | ||
138 | ||
139 | }} // namespace boost::geometry | |
140 | ||
141 | ||
142 | #endif // BOOST_GEOMETRY_ALGORITHMS_NUM_INTERIOR_RINGS_HPP |