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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2014, Oracle and/or its affiliates. | |
4 | ||
5 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
6 | ||
7 | // Licensed under the Boost Software License version 1.0. | |
8 | // http://www.boost.org/users/license.html | |
9 | ||
10 | #ifndef BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP | |
11 | #define BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP | |
12 | ||
13 | #include <cstddef> | |
14 | ||
15 | #include <boost/concept/assert.hpp> | |
16 | #include <boost/core/addressof.hpp> | |
17 | #include <boost/mpl/if.hpp> | |
18 | #include <boost/type_traits/is_const.hpp> | |
19 | ||
20 | #include <boost/geometry/core/access.hpp> | |
21 | #include <boost/geometry/core/assert.hpp> | |
22 | #include <boost/geometry/core/coordinate_type.hpp> | |
23 | ||
24 | #include <boost/geometry/geometries/concepts/point_concept.hpp> | |
25 | ||
26 | namespace boost { namespace geometry | |
27 | { | |
28 | ||
29 | namespace model | |
30 | { | |
31 | ||
32 | // const or non-const segment type that is meant to be | |
33 | // * default constructible | |
34 | // * copy constructible | |
35 | // * assignable | |
36 | // referring_segment does not fit these requirements, hence the | |
37 | // pointing_segment class | |
38 | // | |
39 | // this class is used by the segment_iterator as its value type | |
40 | template <typename ConstOrNonConstPoint> | |
41 | class pointing_segment | |
42 | { | |
43 | BOOST_CONCEPT_ASSERT( ( | |
44 | typename boost::mpl::if_ | |
45 | < | |
46 | boost::is_const<ConstOrNonConstPoint>, | |
47 | concepts::Point<ConstOrNonConstPoint>, | |
48 | concepts::ConstPoint<ConstOrNonConstPoint> | |
49 | > | |
50 | ) ); | |
51 | ||
52 | typedef ConstOrNonConstPoint point_type; | |
53 | ||
54 | public: | |
55 | point_type* first; | |
56 | point_type* second; | |
57 | ||
58 | inline pointing_segment() | |
59 | : first(NULL) | |
60 | , second(NULL) | |
61 | {} | |
62 | ||
63 | inline pointing_segment(point_type const& p1, point_type const& p2) | |
64 | : first(boost::addressof(p1)) | |
65 | , second(boost::addressof(p2)) | |
66 | {} | |
67 | }; | |
68 | ||
69 | ||
70 | } // namespace model | |
71 | ||
72 | ||
73 | // Traits specializations for segment above | |
74 | #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS | |
75 | namespace traits | |
76 | { | |
77 | ||
78 | template <typename Point> | |
79 | struct tag<model::pointing_segment<Point> > | |
80 | { | |
81 | typedef segment_tag type; | |
82 | }; | |
83 | ||
84 | template <typename Point> | |
85 | struct point_type<model::pointing_segment<Point> > | |
86 | { | |
87 | typedef Point type; | |
88 | }; | |
89 | ||
90 | template <typename Point, std::size_t Dimension> | |
91 | struct indexed_access<model::pointing_segment<Point>, 0, Dimension> | |
92 | { | |
93 | typedef model::pointing_segment<Point> segment_type; | |
94 | typedef typename geometry::coordinate_type | |
95 | < | |
96 | segment_type | |
97 | >::type coordinate_type; | |
98 | ||
99 | static inline coordinate_type get(segment_type const& s) | |
100 | { | |
101 | BOOST_GEOMETRY_ASSERT( s.first != NULL ); | |
102 | return geometry::get<Dimension>(*s.first); | |
103 | } | |
104 | ||
105 | static inline void set(segment_type& s, coordinate_type const& value) | |
106 | { | |
107 | BOOST_GEOMETRY_ASSERT( s.first != NULL ); | |
108 | geometry::set<Dimension>(*s.first, value); | |
109 | } | |
110 | }; | |
111 | ||
112 | ||
113 | template <typename Point, std::size_t Dimension> | |
114 | struct indexed_access<model::pointing_segment<Point>, 1, Dimension> | |
115 | { | |
116 | typedef model::pointing_segment<Point> segment_type; | |
117 | typedef typename geometry::coordinate_type | |
118 | < | |
119 | segment_type | |
120 | >::type coordinate_type; | |
121 | ||
122 | static inline coordinate_type get(segment_type const& s) | |
123 | { | |
124 | BOOST_GEOMETRY_ASSERT( s.second != NULL ); | |
125 | return geometry::get<Dimension>(*s.second); | |
126 | } | |
127 | ||
128 | static inline void set(segment_type& s, coordinate_type const& value) | |
129 | { | |
130 | BOOST_GEOMETRY_ASSERT( s.second != NULL ); | |
131 | geometry::set<Dimension>(*s.second, value); | |
132 | } | |
133 | }; | |
134 | ||
135 | ||
136 | ||
137 | } // namespace traits | |
138 | #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS | |
139 | ||
140 | }} // namespace boost::geometry | |
141 | ||
142 | #endif // BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP |