detail/overlay/segment_as_subrange.hpp

0001 // Boost.Geometry (aka GGL, Generic Geometry Library)
0002
0003 // Copyright (c) 2019-2019 Barend Gehrels, Amsterdam, the Netherlands.
0004
0005 // Use, modification and distribution is subject to the Boost Software License,
0006 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0007 // http://www.boost.org/LICENSE_1_0.txt)
0008
0009 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP
0010 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP
0011
0012
0013 #include <cstddef>
0014 #include <map>
0015
0016 #include <boost/geometry/core/access.hpp>
0017
0018 namespace boost { namespace geometry
0019 {
0020
0021 #ifndef DOXYGEN_NO_DETAIL
0022 namespace detail
0023 {
0024
0025 template <typename Segment>
0026 struct segment_as_subrange
0027 {
0028     segment_as_subrange(Segment const& s)
0029         : m_segment(s)
0030     {
0031         geometry::set<0>(m_p1, geometry::get<0, 0>(m_segment));
0032         geometry::set<1>(m_p1, geometry::get<0, 1>(m_segment));
0033         geometry::set<0>(m_p2, geometry::get<1, 0>(m_segment));
0034         geometry::set<1>(m_p2, geometry::get<1, 1>(m_segment));
0035     }
0036
0037     typedef typename geometry::point_type<Segment>::type point_type;
0038
0039     point_type const& at(std::size_t index) const
0040     {
0041         return index == 0 ? m_p1 : m_p2;
0042     }
0043
0044     static inline bool is_last_segment()
0045     {
0046         return true;
0047     }
0048
0049     point_type m_p1, m_p2;
0050
0051     Segment const& m_segment;
0052 };
0053
0054 } // namespace detail
0055 #endif // DOXYGEN_NO_DETAIL
0056
0057 }} // namespace boost::geometry
0058
0059 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_SEGMENT_AS_SUBRANGE_HPP