ceph/src/boost/libs/geometry/include/boost/geometry/iterators/point_reverse_iterator.hpp

   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