geometry/util/order_as_direction.hpp

0001 // Boost.Geometry (aka GGL, Generic Geometry Library)
0002
0003 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
0004 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
0005 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
0006
0007 // This file was modified by Oracle on 2021.
0008 // Modifications copyright (c) 2021 Oracle and/or its affiliates.
0009 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0010
0011 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
0012 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
0013
0014 // Use, modification and distribution is subject to the Boost Software License,
0015 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0016 // http://www.boost.org/LICENSE_1_0.txt)
0017
0018 #ifndef BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP
0019 #define BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP
0020
0021 #include <boost/geometry/core/point_order.hpp>
0022
0023 namespace boost { namespace geometry
0024 {
0025
0026
0027 /*!
0028 \brief Flag for iterating a reversible_view in forward or reverse direction
0029 \ingroup views
0030 */
0031 enum iterate_direction { iterate_forward, iterate_reverse };
0032
0033
0034 template<order_selector Order>
0035 struct order_as_direction
0036 {};
0037
0038
0039 template<>
0040 struct order_as_direction<clockwise>
0041 {
0042     static const iterate_direction value = iterate_forward;
0043 };
0044
0045
0046 template<>
0047 struct order_as_direction<counterclockwise>
0048 {
0049     static const iterate_direction value = iterate_reverse;
0050 };
0051
0052
0053 }} // namespace boost::geometry
0054
0055
0056 #endif // BOOST_GEOMETRY_UTIL_ORDER_AS_DIRECTION_HPP