geometry/iterators/point_reverse_iterator.hpp

0001 // Boost.Geometry (aka GGL, Generic Geometry Library)
0002
0003 // Copyright (c) 2014-2021, Oracle and/or its affiliates.
0004 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
0005 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0006
0007 // Licensed under the Boost Software License version 1.0.
0008 // http://www.boost.org/users/license.html
0009
0010 #ifndef BOOST_GEOMETRY_ITERATORS_POINT_REVERSE_ITERATOR_HPP
0011 #define BOOST_GEOMETRY_ITERATORS_POINT_REVERSE_ITERATOR_HPP
0012
0013 #include <iterator>
0014 #include <type_traits>
0015
0016 #include <boost/geometry/iterators/point_iterator.hpp>
0017
0018 namespace boost { namespace geometry
0019 {
0020
0021
0022 // MK:: need to add doc here
0023 template <typename Geometry>
0024 class point_reverse_iterator
0025     : public std::reverse_iterator<point_iterator<Geometry> >
0026 {
0027 private:
0028     typedef std::reverse_iterator<point_iterator<Geometry> > base_type;
0029
0030     template <typename OtherGeometry> friend class point_reverse_iterator;
0031     template <typename G>
0032     friend inline point_reverse_iterator<G> points_rbegin(G&);
0033
0034     template <typename G>
0035     friend inline point_reverse_iterator<G> points_rend(G&);
0036
0037     inline point_reverse_iterator(base_type const& base_it)
0038         : base_type(base_it) {}
0039
0040 public:
0041     inline point_reverse_iterator() = default;
0042
0043     template
0044     <
0045         typename OtherGeometry,
0046         std::enable_if_t
0047             <
0048                 std::is_convertible
0049                     <
0050                         std::reverse_iterator<point_iterator<OtherGeometry> >,
0051                         std::reverse_iterator<point_iterator<Geometry> >
0052                     >::value,
0053                 int
0054             > = 0
0055     >
0056     inline point_reverse_iterator(point_reverse_iterator<OtherGeometry> const& other)
0057         : base_type(other.base())
0058     {}
0059 };
0060
0061
0062 // MK:: need to add doc here
0063 template <typename Geometry>
0064 inline point_reverse_iterator<Geometry>
0065 points_rbegin(Geometry& geometry)
0066 {
0067     return std::reverse_iterator
0068         <
0069             point_iterator<Geometry>
0070         >(points_end(geometry));
0071 }
0072
0073
0074 // MK:: need to add doc here
0075 template <typename Geometry>
0076 inline point_reverse_iterator<Geometry>
0077 points_rend(Geometry& geometry)
0078 {
0079     return std::reverse_iterator
0080         <
0081             point_iterator<Geometry>
0082         >(points_begin(geometry));
0083 }
0084
0085
0086 }} // namespace boost::geometry
0087
0088 #endif // BOOST_GEOMETRY_ITERATORS_POINT_REVERSE_ITERATOR_HPP