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 {
applyboost::geometry::detail::turns::remove_duplicate_turns26     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>
operator ()boost::geometry::detail::turns::remove_duplicate_turns::TurnEqualsTo38         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:
apply(Turns & turns)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
63