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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
- // This file was modified by Oracle on 2015.
- // Modifications copyright (c) 2015, Oracle and/or its affiliates.
- // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
- // 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_CORE_RING_TYPE_HPP
- #define BOOST_GEOMETRY_CORE_RING_TYPE_HPP
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/if.hpp>
- #include <boost/range/value_type.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <boost/type_traits/remove_const.hpp>
- #include <boost/type_traits/remove_reference.hpp>
- #include <boost/geometry/core/tag.hpp>
- #include <boost/geometry/core/tags.hpp>
- namespace boost { namespace geometry
- {
- namespace traits
- {
- /*!
- \brief Traits class to indicate ring-type of a polygon's exterior ring/interior rings
- \ingroup traits
- \par Geometries:
- - polygon
- \par Specializations should provide:
- - typedef XXX type ( e.g. ring<P> )
- \tparam Geometry geometry
- */
- template <typename Geometry>
- struct ring_const_type
- {
- BOOST_MPL_ASSERT_MSG
- (
- false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
- , (types<Geometry>)
- );
- };
- template <typename Geometry>
- struct ring_mutable_type
- {
- BOOST_MPL_ASSERT_MSG
- (
- false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
- , (types<Geometry>)
- );
- };
- } // namespace traits
- #ifndef DOXYGEN_NO_DISPATCH
- namespace core_dispatch
- {
- template <typename GeometryTag, typename Geometry>
- struct ring_return_type
- {};
- template <typename LineString>
- struct ring_return_type<linestring_tag, LineString>
- {
- typedef LineString& type;
- };
- template <typename Ring>
- struct ring_return_type<ring_tag, Ring>
- {
- typedef Ring& type;
- };
- template <typename Polygon>
- struct ring_return_type<polygon_tag, Polygon>
- {
- typedef typename boost::remove_const<Polygon>::type nc_polygon_type;
- typedef typename boost::mpl::if_
- <
- boost::is_const<Polygon>,
- typename traits::ring_const_type<nc_polygon_type>::type,
- typename traits::ring_mutable_type<nc_polygon_type>::type
- >::type type;
- };
- template <typename MultiLinestring>
- struct ring_return_type<multi_linestring_tag, MultiLinestring>
- {
- typedef typename ring_return_type
- <
- linestring_tag,
- typename boost::mpl::if_
- <
- boost::is_const<MultiLinestring>,
- typename boost::range_value<MultiLinestring>::type const,
- typename boost::range_value<MultiLinestring>::type
- >::type
- >::type type;
- };
- template <typename MultiPolygon>
- struct ring_return_type<multi_polygon_tag, MultiPolygon>
- {
- typedef typename ring_return_type
- <
- polygon_tag,
- typename boost::mpl::if_
- <
- boost::is_const<MultiPolygon>,
- typename boost::range_value<MultiPolygon>::type const,
- typename boost::range_value<MultiPolygon>::type
- >::type
- >::type type;
- };
- template <typename GeometryTag, typename Geometry>
- struct ring_type
- {};
- template <typename Ring>
- struct ring_type<ring_tag, Ring>
- {
- typedef Ring type;
- };
- template <typename Polygon>
- struct ring_type<polygon_tag, Polygon>
- {
- typedef typename boost::remove_reference
- <
- typename ring_return_type<polygon_tag, Polygon>::type
- >::type type;
- };
- template <typename MultiLinestring>
- struct ring_type<multi_linestring_tag, MultiLinestring>
- {
- typedef typename boost::remove_reference
- <
- typename ring_return_type<multi_linestring_tag, MultiLinestring>::type
- >::type type;
- };
- template <typename MultiPolygon>
- struct ring_type<multi_polygon_tag, MultiPolygon>
- {
- typedef typename boost::remove_reference
- <
- typename ring_return_type<multi_polygon_tag, MultiPolygon>::type
- >::type type;
- };
- } // namespace core_dispatch
- #endif
- /*!
- \brief \brief_meta{type, ring_type, \meta_geometry_type}
- \details A polygon contains one exterior ring
- and zero or more interior rings (holes).
- This metafunction retrieves the type of the rings.
- Exterior ring and each of the interior rings all have the same ring_type.
- \tparam Geometry A type fullfilling the Ring, Polygon or MultiPolygon concept.
- \ingroup core
- \qbk{[include reference/core/ring_type.qbk]}
- */
- template <typename Geometry>
- struct ring_type
- {
- typedef typename core_dispatch::ring_type
- <
- typename tag<Geometry>::type,
- Geometry
- >::type type;
- };
- template <typename Geometry>
- struct ring_return_type
- {
- typedef typename core_dispatch::ring_return_type
- <
- typename tag<Geometry>::type,
- Geometry
- >::type type;
- };
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_CORE_RING_TYPE_HPP
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