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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2014, Oracle and/or its affiliates.
- // Licensed under the Boost Software License version 1.0.
- // http://www.boost.org/users/license.html
- // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
- #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP
- #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP
- #include <algorithm>
- #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
- namespace boost { namespace geometry
- {
- namespace detail { namespace turns
- {
- template <typename Turns, bool Enable>
- struct filter_continue_turns
- {
- static inline void apply(Turns&) {}
- };
- template <typename Turns>
- class filter_continue_turns<Turns, true>
- {
- private:
- class IsContinueTurn
- {
- private:
- template <typename Operation>
- inline bool is_continue_or_opposite(Operation const& operation) const
- {
- return operation == detail::overlay::operation_continue
- || operation == detail::overlay::operation_opposite;
- }
- public:
- template <typename Turn>
- bool operator()(Turn const& turn) const
- {
- if ( turn.method != detail::overlay::method_collinear
- && turn.method != detail::overlay::method_equal )
- {
- return false;
- }
- return is_continue_or_opposite(turn.operations[0].operation)
- && is_continue_or_opposite(turn.operations[1].operation);
- }
- };
- public:
- static inline void apply(Turns& turns)
- {
- turns.erase( std::remove_if(turns.begin(), turns.end(),
- IsContinueTurn()),
- turns.end()
- );
- }
- };
- }} // namespace detail::turns
- }} // namespect boost::geometry
- #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_TURNS_FILTER_CONTINUE_TURNS_HPP
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