75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
|
// 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
|