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94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2020-2021.
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// Modifications copyright (c) 2020-2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
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#define BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
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#include <boost/version.hpp>
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#include <boost/range/adaptor/reversed.hpp>
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#include <boost/geometry/core/point_order.hpp>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/util/order_as_direction.hpp>
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#include <boost/geometry/views/identity_view.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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// As template alias for now. It's possible that this should be a struct.
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// It'd also prevent instantiating the other, unneeded view.
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template
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<
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typename Range,
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order_selector Order = geometry::point_order<Range>::value
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>
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using clockwise_view = std::conditional_t
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<
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Order == counterclockwise,
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boost::reversed_range<Range>,
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identity_view<Range>
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>;
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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/*!
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\brief View on a range, reversing direction if necessary
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\tparam Range original range
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\tparam Direction direction of iteration
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\ingroup views
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*/
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template <typename Range, iterate_direction Direction>
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struct reversible_view {};
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#ifndef DOXYGEN_NO_SPECIALIZATIONS
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template <typename Range>
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struct reversible_view<Range, iterate_forward>
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{
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using type = identity_view<Range>;
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};
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template <typename Range>
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struct reversible_view<Range, iterate_reverse>
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{
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using type = boost::reversed_range<Range>;
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};
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#endif // DOXYGEN_NO_SPECIALIZATIONS
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
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