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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_CORE_POINT_TYPE_HPP
- #define BOOST_GEOMETRY_CORE_POINT_TYPE_HPP
- #include <boost/mpl/assert.hpp>
- #include <boost/range/value_type.hpp>
- #include <boost/type_traits/remove_const.hpp>
- #include <boost/geometry/core/ring_type.hpp>
- #include <boost/geometry/core/tag.hpp>
- #include <boost/geometry/core/tags.hpp>
- #include <boost/geometry/util/bare_type.hpp>
- namespace boost { namespace geometry
- {
- namespace traits
- {
- /*!
- \brief Traits class indicating the type of contained points
- \ingroup traits
- \par Geometries:
- - all geometries except point
- \par Specializations should provide:
- - typedef P type (where P should fulfil the Point concept)
- \tparam Geometry geometry
- */
- template <typename Geometry>
- struct point_type
- {
- BOOST_MPL_ASSERT_MSG
- (
- false, NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE, (types<Geometry>)
- );
- };
- } // namespace traits
- #ifndef DOXYGEN_NO_DISPATCH
- namespace core_dispatch
- {
- template <typename Tag, typename Geometry>
- struct point_type
- {
- // Default: call traits to get point type
- typedef typename boost::remove_const
- <
- typename traits::point_type<Geometry>::type
- >::type type;
- };
- // Specialization for point: the point itself
- template <typename Point>
- struct point_type<point_tag, Point>
- {
- typedef Point type;
- };
- // Specializations for linestring/ring, via boost::range
- template <typename Linestring>
- struct point_type<linestring_tag, Linestring>
- {
- typedef typename boost::range_value<Linestring>::type type;
- };
- template <typename Ring>
- struct point_type<ring_tag, Ring>
- {
- typedef typename boost::range_value<Ring>::type type;
- };
- // Specialization for polygon: the point-type is the point-type of its rings
- template <typename Polygon>
- struct point_type<polygon_tag, Polygon>
- {
- typedef typename point_type
- <
- ring_tag,
- typename ring_type<polygon_tag, Polygon>::type
- >::type type;
- };
- template <typename MultiPoint>
- struct point_type<multi_point_tag, MultiPoint>
- {
- typedef typename boost::range_value
- <
- MultiPoint
- >::type type;
- };
- template <typename MultiLinestring>
- struct point_type<multi_linestring_tag, MultiLinestring>
- {
- typedef typename point_type
- <
- linestring_tag,
- typename boost::range_value<MultiLinestring>::type
- >::type type;
- };
- template <typename MultiPolygon>
- struct point_type<multi_polygon_tag, MultiPolygon>
- {
- typedef typename point_type
- <
- polygon_tag,
- typename boost::range_value<MultiPolygon>::type
- >::type type;
- };
- } // namespace core_dispatch
- #endif // DOXYGEN_NO_DISPATCH
- /*!
- \brief \brief_meta{type, point_type, \meta_geometry_type}
- \tparam Geometry \tparam_geometry
- \ingroup core
- \qbk{[include reference/core/point_type.qbk]}
- */
- template <typename Geometry>
- struct point_type
- {
- typedef typename core_dispatch::point_type
- <
- typename tag<Geometry>::type,
- typename boost::geometry::util::bare_type<Geometry>::type
- >::type type;
- };
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_CORE_POINT_TYPE_HPP
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