boost/geometry/algorithms/detail/overlay/segment_as_subrange.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2019-2019 Barend Gehrels, Amsterdam, the Netherlands.
   4
   5 // Use, modification and distribution is subject to the Boost Software License,
   6 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP
  10 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP
  11
  12
  13 #include <cstddef>
  14 #include <map>
  15
  16 #include <boost/geometry/core/access.hpp>
  17
  18 namespace boost { namespace geometry
  19 {
  20
  21 #ifndef DOXYGEN_NO_DETAIL
  22 namespace detail
  23 {
  24
  25 template <typename Segment>
  26 struct segment_as_subrange
  27 {
  28     segment_as_subrange(Segment const& s)
  29         : m_segment(s)
  30     {
  31         geometry::set<0>(m_p1, geometry::get<0, 0>(m_segment));
  32         geometry::set<1>(m_p1, geometry::get<0, 1>(m_segment));
  33         geometry::set<0>(m_p2, geometry::get<1, 0>(m_segment));
  34         geometry::set<1>(m_p2, geometry::get<1, 1>(m_segment));
  35     }
  36
  37     typedef typename geometry::point_type<Segment>::type point_type;
  38
  39     point_type const& at(std::size_t index) const
  40     {
  41         return index == 0 ? m_p1 : m_p2;
  42     }
  43
  44     static inline bool is_last_segment()
  45     {
  46         return true;
  47     }
  48
  49     point_type m_p1, m_p2;
  50
  51     Segment const& m_segment;
  52 };
  53
  54 } // namespace detail
  55 #endif // DOXYGEN_NO_DETAIL
  56
  57 }} // namespace boost::geometry
  58
  59 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP