1 // Boost.Geometry (aka GGL, Generic Geometry Library)
3 // Copyright (c) 2014, Oracle and/or its affiliates.
5 // Licensed under the Boost Software License version 1.0.
6 // http://www.boost.org/users/license.html
8 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
11 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP
12 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP
15 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
17 namespace boost { namespace geometry
20 namespace detail { namespace turns
24 template <typename Turns, bool Enable>
25 struct filter_continue_turns
27 static inline void apply(Turns&) {}
31 template <typename Turns>
32 class filter_continue_turns<Turns, true>
38 template <typename Operation>
39 inline bool is_continue_or_opposite(Operation const& operation) const
41 return operation == detail::overlay::operation_continue
42 || operation == detail::overlay::operation_opposite;
46 template <typename Turn>
47 bool operator()(Turn const& turn) const
49 if ( turn.method != detail::overlay::method_collinear
50 && turn.method != detail::overlay::method_equal )
55 return is_continue_or_opposite(turn.operations[0].operation)
56 && is_continue_or_opposite(turn.operations[1].operation);
62 static inline void apply(Turns& turns)
64 turns.erase( std::remove_if(turns.begin(), turns.end(),
72 }} // namespace detail::turns
74 }} // namespect boost::geometry
78 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP