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74 lines
1.9 KiB
74 lines
1.9 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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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.hpp> |
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#include <boost/range/adaptor/reversed.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/views/identity_view.hpp> |
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namespace boost { namespace geometry |
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{ |
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/*! |
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\brief Flag for iterating a reversible_view in forward or reverse direction |
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\ingroup views |
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*/ |
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enum iterate_direction { iterate_forward, iterate_reverse }; |
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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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typedef identity_view<Range> type; |
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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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#if BOOST_VERSION > 104500 |
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typedef boost::reversed_range<Range> type; |
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#else |
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// For older versions of Boost |
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typedef boost::range_detail::reverse_range<Range> type; |
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#endif |
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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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