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- // 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_ALGORITHMS_DETAIL_AS_RANGE_HPP
- #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
- #include <boost/geometry/core/exterior_ring.hpp>
- #include <boost/geometry/core/tag.hpp>
- #include <boost/geometry/core/tags.hpp>
- #include <boost/geometry/util/add_const_if_c.hpp>
- namespace boost { namespace geometry
- {
- #ifndef DOXYGEN_NO_DISPATCH
- namespace dispatch
- {
- template <typename GeometryTag, typename Geometry, typename Range, bool IsConst>
- struct as_range
- {
- static inline typename add_const_if_c<IsConst, Range>::type& get(
- typename add_const_if_c<IsConst, Geometry>::type& input)
- {
- return input;
- }
- };
- template <typename Geometry, typename Range, bool IsConst>
- struct as_range<polygon_tag, Geometry, Range, IsConst>
- {
- static inline typename add_const_if_c<IsConst, Range>::type& get(
- typename add_const_if_c<IsConst, Geometry>::type& input)
- {
- return exterior_ring(input);
- }
- };
- } // namespace dispatch
- #endif // DOXYGEN_NO_DISPATCH
- // Will probably be replaced by the more generic "view_as", therefore in detail
- namespace detail
- {
- /*!
- \brief Function getting either the range (ring, linestring) itself
- or the outer ring (polygon)
- \details Utility to handle polygon's outer ring as a range
- \ingroup utility
- */
- template <typename Range, typename Geometry>
- inline Range& as_range(Geometry& input)
- {
- return dispatch::as_range
- <
- typename tag<Geometry>::type,
- Geometry,
- Range,
- false
- >::get(input);
- }
- /*!
- \brief Function getting either the range (ring, linestring) itself
- or the outer ring (polygon), const version
- \details Utility to handle polygon's outer ring as a range
- \ingroup utility
- */
- template <typename Range, typename Geometry>
- inline Range const& as_range(Geometry const& input)
- {
- return dispatch::as_range
- <
- typename tag<Geometry>::type,
- Geometry,
- Range,
- true
- >::get(input);
- }
- }
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
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