]>
Commit | Line | Data |
---|---|---|
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 | ||
7 | // This file was modified by Oracle on 2014. | |
8 | // Modifications copyright (c) 2014, 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_ALGORITHMS_NUM_GEOMETRIES_HPP | |
21 | #define BOOST_GEOMETRY_ALGORITHMS_NUM_GEOMETRIES_HPP | |
22 | ||
23 | #include <cstddef> | |
24 | ||
25 | #include <boost/range.hpp> | |
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/algorithms/not_implemented.hpp> | |
32 | ||
33 | #include <boost/geometry/core/tag.hpp> | |
34 | #include <boost/geometry/core/tags.hpp> | |
35 | #include <boost/geometry/core/tag_cast.hpp> | |
36 | ||
37 | #include <boost/geometry/geometries/concepts/check.hpp> | |
38 | ||
39 | #include <boost/geometry/algorithms/detail/counting.hpp> | |
40 | ||
41 | ||
42 | namespace boost { namespace geometry | |
43 | { | |
44 | ||
45 | ||
46 | #ifndef DOXYGEN_NO_DISPATCH | |
47 | namespace dispatch | |
48 | { | |
49 | ||
50 | ||
51 | template | |
52 | < | |
53 | typename Geometry, | |
54 | typename Tag = typename tag_cast | |
55 | < | |
56 | typename tag<Geometry>::type, | |
57 | single_tag, | |
58 | multi_tag | |
59 | >::type | |
60 | > | |
61 | struct num_geometries: not_implemented<Tag> | |
62 | {}; | |
63 | ||
64 | ||
65 | template <typename Geometry> | |
66 | struct num_geometries<Geometry, single_tag> | |
67 | : detail::counting::other_count<1> | |
68 | {}; | |
69 | ||
70 | ||
71 | template <typename MultiGeometry> | |
72 | struct num_geometries<MultiGeometry, multi_tag> | |
73 | { | |
74 | static inline std::size_t apply(MultiGeometry const& multi_geometry) | |
75 | { | |
76 | return boost::size(multi_geometry); | |
77 | } | |
78 | }; | |
79 | ||
80 | ||
81 | } // namespace dispatch | |
82 | #endif // DOXYGEN_NO_DISPATCH | |
83 | ||
84 | ||
85 | namespace resolve_variant | |
86 | { | |
87 | ||
88 | template <typename Geometry> | |
89 | struct num_geometries | |
90 | { | |
91 | static inline std::size_t apply(Geometry const& geometry) | |
92 | { | |
93 | concepts::check<Geometry const>(); | |
94 | ||
95 | return dispatch::num_geometries<Geometry>::apply(geometry); | |
96 | } | |
97 | }; | |
98 | ||
99 | template <BOOST_VARIANT_ENUM_PARAMS(typename T)> | |
100 | struct num_geometries<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > | |
101 | { | |
102 | struct visitor: boost::static_visitor<std::size_t> | |
103 | { | |
104 | template <typename Geometry> | |
105 | inline std::size_t operator()(Geometry const& geometry) const | |
106 | { | |
107 | return num_geometries<Geometry>::apply(geometry); | |
108 | } | |
109 | }; | |
110 | ||
111 | static inline std::size_t | |
112 | apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry) | |
113 | { | |
114 | return boost::apply_visitor(visitor(), geometry); | |
115 | } | |
116 | }; | |
117 | ||
118 | } // namespace resolve_variant | |
119 | ||
120 | ||
121 | /*! | |
122 | \brief \brief_calc{number of geometries} | |
123 | \ingroup num_geometries | |
124 | \details \details_calc{num_geometries, number of geometries}. | |
125 | \tparam Geometry \tparam_geometry | |
126 | \param geometry \param_geometry | |
127 | \return \return_calc{number of geometries} | |
128 | ||
129 | \qbk{[include reference/algorithms/num_geometries.qbk]} | |
130 | */ | |
131 | template <typename Geometry> | |
132 | inline std::size_t num_geometries(Geometry const& geometry) | |
133 | { | |
134 | return resolve_variant::num_geometries<Geometry>::apply(geometry); | |
135 | } | |
136 | ||
137 | ||
138 | }} // namespace boost::geometry | |
139 | ||
140 | ||
141 | #endif // BOOST_GEOMETRY_ALGORITHMS_NUM_GEOMETRIES_HPP |