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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_ITERATORS_POINT_REVERSE_ITERATOR_HPP | |
11 | #define BOOST_GEOMETRY_ITERATORS_POINT_REVERSE_ITERATOR_HPP | |
12 | ||
13 | #include <iterator> | |
14 | ||
15 | #include <boost/mpl/assert.hpp> | |
16 | #include <boost/type_traits/is_convertible.hpp> | |
17 | ||
18 | #include <boost/geometry/iterators/point_iterator.hpp> | |
19 | ||
20 | namespace boost { namespace geometry | |
21 | { | |
22 | ||
23 | ||
24 | // MK:: need to add doc here | |
25 | template <typename Geometry> | |
26 | class point_reverse_iterator | |
27 | : public std::reverse_iterator<point_iterator<Geometry> > | |
28 | { | |
29 | private: | |
30 | typedef std::reverse_iterator<point_iterator<Geometry> > base_type; | |
31 | ||
32 | template <typename OtherGeometry> friend class point_reverse_iterator; | |
33 | template <typename G> | |
34 | friend inline point_reverse_iterator<G> points_rbegin(G&); | |
35 | ||
36 | template <typename G> | |
37 | friend inline point_reverse_iterator<G> points_rend(G&); | |
38 | ||
39 | inline point_reverse_iterator(base_type const& base_it) | |
40 | : base_type(base_it) {} | |
41 | ||
42 | public: | |
43 | inline point_reverse_iterator() {} | |
44 | ||
45 | template <typename OtherGeometry> | |
46 | inline | |
47 | point_reverse_iterator(point_reverse_iterator<OtherGeometry> const& other) | |
48 | : base_type(other.base()) | |
49 | { | |
50 | static const bool is_conv = boost::is_convertible | |
51 | < | |
52 | std::reverse_iterator<point_iterator<Geometry> >, | |
53 | std::reverse_iterator<point_iterator<OtherGeometry> > | |
54 | >::value; | |
55 | ||
56 | BOOST_MPL_ASSERT_MSG((is_conv), | |
57 | NOT_CONVERTIBLE, | |
58 | (point_reverse_iterator<OtherGeometry>)); | |
59 | } | |
60 | }; | |
61 | ||
62 | ||
63 | // MK:: need to add doc here | |
64 | template <typename Geometry> | |
65 | inline point_reverse_iterator<Geometry> | |
66 | points_rbegin(Geometry& geometry) | |
67 | { | |
68 | return std::reverse_iterator | |
69 | < | |
70 | point_iterator<Geometry> | |
71 | >(points_end(geometry)); | |
72 | } | |
73 | ||
74 | ||
75 | // MK:: need to add doc here | |
76 | template <typename Geometry> | |
77 | inline point_reverse_iterator<Geometry> | |
78 | points_rend(Geometry& geometry) | |
79 | { | |
80 | return std::reverse_iterator | |
81 | < | |
82 | point_iterator<Geometry> | |
83 | >(points_begin(geometry)); | |
84 | } | |
85 | ||
86 | ||
87 | }} // namespace boost::geometry | |
88 | ||
89 | #endif // BOOST_GEOMETRY_ITERATORS_POINT_REVERSE_ITERATOR_HPP |