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