171 lines
3.6 KiB
C++
171 lines
3.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_CORE_RING_TYPE_HPP
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#define BOOST_GEOMETRY_CORE_RING_TYPE_HPP
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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namespace boost { namespace geometry
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{
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namespace traits
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{
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/*!
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\brief Traits class to indicate ring-type of a polygon's exterior ring/interior rings
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\ingroup traits
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\par Geometries:
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- polygon
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\par Specializations should provide:
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- typedef XXX type ( e.g. ring<P> )
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\tparam Geometry geometry
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*/
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template <typename Geometry>
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struct ring_const_type
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{
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BOOST_MPL_ASSERT_MSG
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(
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false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
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, (types<Geometry>)
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);
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};
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template <typename Geometry>
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struct ring_mutable_type
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{
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BOOST_MPL_ASSERT_MSG
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(
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false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
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, (types<Geometry>)
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);
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};
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} // namespace traits
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#ifndef DOXYGEN_NO_DISPATCH
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namespace core_dispatch
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{
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template <typename GeometryTag, typename Geometry>
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struct ring_return_type
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{};
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template <typename LineString>
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struct ring_return_type<linestring_tag, LineString>
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{
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typedef LineString& type;
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};
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template <typename Ring>
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struct ring_return_type<ring_tag, Ring>
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{
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typedef Ring& type;
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};
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template <typename Polygon>
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struct ring_return_type<polygon_tag, Polygon>
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{
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typedef typename boost::remove_const<Polygon>::type nc_polygon_type;
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typedef typename mpl::if_
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<
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boost::is_const<Polygon>,
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typename traits::ring_const_type<nc_polygon_type>::type,
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typename traits::ring_mutable_type<nc_polygon_type>::type
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>::type type;
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};
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template <typename GeometryTag, typename Geometry>
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struct ring_type
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{};
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template <typename Ring>
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struct ring_type<ring_tag, Ring>
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{
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typedef Ring type;
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};
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template <typename Polygon>
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struct ring_type<polygon_tag, Polygon>
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{
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typedef typename boost::remove_reference
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<
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typename ring_return_type<polygon_tag, Polygon>::type
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>::type type;
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};
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} // namespace core_dispatch
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#endif
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/*!
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\brief \brief_meta{type, ring_type, \meta_geometry_type}
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\details A polygon contains one exterior ring
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and zero or more interior rings (holes).
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This metafunction retrieves the type of the rings.
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Exterior ring and each of the interior rings all have the same ring_type.
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\tparam Geometry A type fullfilling the Ring, Polygon or MultiPolygon concept.
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\ingroup core
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\qbk{[include reference/core/ring_type.qbk]}
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*/
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template <typename Geometry>
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struct ring_type
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{
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typedef typename core_dispatch::ring_type
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<
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typename tag<Geometry>::type,
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Geometry
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>::type type;
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};
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template <typename Geometry>
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struct ring_return_type
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{
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typedef typename core_dispatch::ring_return_type
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<
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typename tag<Geometry>::type,
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Geometry
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>::type type;
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};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_CORE_RING_TYPE_HPP
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