diff options
Diffstat (limited to 'boost/geometry/algorithms/detail/overlay/is_self_turn.hpp')
-rw-r--r-- | boost/geometry/algorithms/detail/overlay/is_self_turn.hpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp b/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp new file mode 100644 index 0000000000..9cb7a0fca9 --- /dev/null +++ b/boost/geometry/algorithms/detail/overlay/is_self_turn.hpp @@ -0,0 +1,68 @@ +// Boost.Geometry (aka GGL, Generic Geometry Library) + +// Copyright (c) 2017-2017 Barend Gehrels, Amsterdam, the Netherlands. + +// Use, modification and distribution is subject to the Boost Software License, +// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) + +#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP +#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP + +#include <boost/geometry/algorithms/detail/overlay/overlay_type.hpp> + +namespace boost { namespace geometry +{ + + +#ifndef DOXYGEN_NO_DETAIL +namespace detail { namespace overlay +{ + +template <overlay_type OverlayType> +struct is_self_turn_check +{ + template <typename Turn> + static inline bool apply(Turn const& turn) + { + return turn.operations[0].seg_id.source_index + == turn.operations[1].seg_id.source_index; + } +}; + +template <> +struct is_self_turn_check<overlay_buffer> +{ + template <typename Turn> + static inline bool apply(Turn const& turn) + { + return false; + } +}; + +template <> +struct is_self_turn_check<overlay_dissolve> +{ + template <typename Turn> + static inline bool apply(Turn const& turn) + { + return false; + } +}; + + +template <overlay_type OverlayType, typename Turn> +bool is_self_turn(Turn const& turn) +{ + return is_self_turn_check<OverlayType>::apply(turn); +} + + +}} // namespace detail::overlay +#endif // DOXYGEN_NO_DETAIL + + +}} // namespace boost::geometry + + +#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_IS_SELF_TURN_HPP |