Added boost header

test/external/boost/geometry/views/reversible_view.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2011 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