EVOLUTION-MANAGER

Edit File: reversible_view.hpp

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