Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@16: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@16: // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
Chris@16: // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
Chris@16: #define BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP
Chris@16: 
Chris@16: 
Chris@16: #include <boost/version.hpp>
Chris@16: #include <boost/range.hpp>
Chris@16: #include <boost/range/adaptor/reversed.hpp>
Chris@16: 
Chris@16: #include <boost/geometry/core/ring_type.hpp>
Chris@16: #include <boost/geometry/core/tag.hpp>
Chris@16: #include <boost/geometry/core/tags.hpp>
Chris@16: 
Chris@16: #include <boost/geometry/views/identity_view.hpp>
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@16: /*!
Chris@16: \brief Flag for iterating a reversible_view in forward or reverse direction
Chris@16: \ingroup views
Chris@16: */
Chris@16: enum iterate_direction { iterate_forward, iterate_reverse };
Chris@16: 
Chris@16: /*!
Chris@16: \brief View on a range, reversing direction if necessary
Chris@16: \tparam Range original range
Chris@16: \tparam Direction direction of iteration
Chris@16: \ingroup views
Chris@16: */
Chris@16: template <typename Range, iterate_direction Direction>
Chris@16: struct reversible_view {};
Chris@16: 
Chris@16: 
Chris@16: 
Chris@16: #ifndef DOXYGEN_NO_SPECIALIZATIONS
Chris@16: 
Chris@16: template <typename Range>
Chris@16: struct reversible_view<Range, iterate_forward>
Chris@16: {
Chris@16:     typedef identity_view<Range> type;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <typename Range>
Chris@16: struct reversible_view<Range, iterate_reverse>
Chris@16: {
Chris@16: #if BOOST_VERSION > 104500
Chris@16:     typedef boost::reversed_range<Range> type;
Chris@16: #else
Chris@16:     // For older versions of Boost
Chris@16:     typedef boost::range_detail::reverse_range<Range> type;
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: #endif // DOXYGEN_NO_SPECIALIZATIONS
Chris@16: 
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_VIEWS_REVERSIBLE_VIEW_HPP