order_as_direction.hpp 1.2 KB

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  1. // Boost.Geometry (aka GGL, Generic Geometry Library)
  2. // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
  3. // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
  4. // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
  5. // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  6. // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  7. // Use, modification and distribution is subject to the Boost Software License,
  8. // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. #ifndef BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP
  11. #define BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP
  12. #include <boost/geometry/core/point_order.hpp>
  13. #include <boost/geometry/views/reversible_view.hpp>
  14. namespace boost { namespace geometry
  15. {
  16. template<order_selector Order>
  17. struct order_as_direction
  18. {};
  19. template<>
  20. struct order_as_direction<clockwise>
  21. {
  22. static const iterate_direction value = iterate_forward;
  23. };
  24. template<>
  25. struct order_as_direction<counterclockwise>
  26. {
  27. static const iterate_direction value = iterate_reverse;
  28. };
  29. }} // namespace boost::geometry
  30. #endif // BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP