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 point_reverse_iterator(base_type const & base_it)39 inline point_reverse_iterator(base_type const& base_it) 40 : base_type(base_it) {} 41 42 public: point_reverse_iterator()43 inline point_reverse_iterator() {} 44 45 template <typename OtherGeometry> 46 inline point_reverse_iterator(point_reverse_iterator<OtherGeometry> const & other)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> points_rbegin(Geometry & geometry)66points_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> points_rend(Geometry & geometry)78points_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 90