ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/turns/remove_duplicate_turns.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014, Oracle and/or its affiliates.
   4
   5 // Licensed under the Boost Software License version 1.0.
   6 // http://www.boost.org/users/license.html
   7
   8 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   9
  10
  11 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_REMOVE_DUPLICATE_TURNS_HPP
  12 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_REMOVE_DUPLICATE_TURNS_HPP
  13
  14 #include <algorithm>
  15 #include <boost/geometry/algorithms/equals.hpp>
  16
  17 namespace boost { namespace geometry
  18 {
  19
  20 namespace detail { namespace turns
  21 {
  22
  23 template <typename Turns, bool Enable>
  24 struct remove_duplicate_turns
  25 {
  26     static inline void apply(Turns&) {}
  27 };
  28
  29
  30
  31 template <typename Turns>
  32 class remove_duplicate_turns<Turns, true>
  33 {
  34 private:
  35     struct TurnEqualsTo
  36     {
  37         template <typename Turn>
  38         bool operator()(Turn const& t1, Turn const& t2) const
  39         {
  40             return geometry::equals(t1.point, t2.point)
  41                 && t1.operations[0].seg_id == t2.operations[0].seg_id
  42                 && t1.operations[1].seg_id == t2.operations[1].seg_id;
  43         }
  44     };
  45
  46 public:
  47     static inline void apply(Turns& turns)
  48     {
  49         turns.erase( std::unique(turns.begin(), turns.end(),
  50                                  TurnEqualsTo()),
  51                      turns.end()
  52                      );
  53     }
  54 };
  55
  56
  57
  58 }} // namespace detail::turns
  59
  60 }} // namespect boost::geometry
  61
  62 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_REMOVE_DUPLICATE_TURNS_HPP