projects / ceph.git / blame
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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
| 2 | ||
| 3 | // Copyright (c) 2017-2017 Barend Gehrels, Amsterdam, the Netherlands. | |
| 4 | ||
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5 | // This file was modified by Oracle on 2020. |
| 6 | // Modifications copyright (c) 2020 Oracle and/or its affiliates. | |
| 7 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
| 8 | ||
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9 | // Use, modification and distribution is subject to the Boost Software License, |
| 10 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
| 11 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 12 | ||
| 13 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_NEEDS_SELF_TURNS_HPP | |
| 14 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_NEEDS_SELF_TURNS_HPP | |
| 15 | ||
| 20effc67 TL |
16 | #include <boost/range/begin.hpp> |
| 17 | #include <boost/range/size.hpp> | |
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18 | |
| 19 | #include <boost/geometry/core/tags.hpp> | |
| 20 | #include <boost/geometry/algorithms/num_interior_rings.hpp> | |
| 21 | ||
| 22 | ||
| 23 | namespace boost { namespace geometry | |
| 24 | { | |
| 25 | ||
| 26 | ||
| 27 | #ifndef DOXYGEN_NO_DETAIL | |
| 28 | namespace detail { namespace overlay | |
| 29 | { | |
| 30 | ||
| 31 | template | |
| 32 | < | |
| 33 | typename Geometry, | |
| 34 | typename Tag = typename tag<Geometry>::type | |
| 35 | > | |
| 36 | struct needs_self_turns | |
| 37 | { | |
| 38 | }; | |
| 39 | ||
| 40 | template <typename Geometry> | |
| 41 | struct needs_self_turns<Geometry, box_tag> | |
| 42 | { | |
| 43 | static inline bool apply(Geometry const&) | |
| 44 | { | |
| 45 | return false; | |
| 46 | } | |
| 47 | }; | |
| 48 | ||
| 49 | template <typename Geometry> | |
| 50 | struct needs_self_turns<Geometry, ring_tag> | |
| 51 | { | |
| 52 | static inline bool apply(Geometry const&) | |
| 53 | { | |
| 54 | return false; | |
| 55 | } | |
| 56 | }; | |
| 57 | ||
| 58 | template <typename Geometry> | |
| 59 | struct needs_self_turns<Geometry, polygon_tag> | |
| 60 | { | |
| 61 | static inline bool apply(Geometry const& polygon) | |
| 62 | { | |
| 63 | return geometry::num_interior_rings(polygon) > 0; | |
| 64 | } | |
| 65 | }; | |
| 66 | ||
| 67 | template <typename Geometry> | |
| 68 | struct needs_self_turns<Geometry, multi_polygon_tag> | |
| 69 | { | |
| 70 | static inline bool apply(Geometry const& multi) | |
| 71 | { | |
| 72 | typedef typename boost::range_value<Geometry>::type polygon_type; | |
| 73 | std::size_t const n = boost::size(multi); | |
| 74 | return n > 1 || (n == 1 | |
| 75 | && needs_self_turns<polygon_type> | |
| 76 | ::apply(*boost::begin(multi))); | |
| 77 | } | |
| 78 | }; | |
| 79 | ||
| 80 | ||
| 81 | }} // namespace detail::overlay | |
| 82 | #endif // DOXYGEN_NO_DETAIL | |
| 83 | ||
| 84 | ||
| 85 | }} // namespace boost::geometry | |
| 86 | ||
| 87 | ||
| 88 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_NEEDS_SELF_TURNS_HPP |