131 lines
3.0 KiB
C++
131 lines
3.0 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_POINT_TYPE_HPP
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#define BOOST_GEOMETRY_CORE_POINT_TYPE_HPP
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#include <boost/mpl/assert.hpp>
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#include <boost/range.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/geometry/core/ring_type.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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#include <boost/geometry/util/bare_type.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 indicating the type of contained points
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\ingroup traits
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\par Geometries:
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- all geometries except point
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\par Specializations should provide:
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- typedef P type (where P should fulfil the Point concept)
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\tparam Geometry geometry
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*/
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template <typename Geometry>
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struct point_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_POINT_TYPE, (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 Tag, typename Geometry>
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struct point_type
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{
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// Default: call traits to get point type
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typedef typename boost::remove_const
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<
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typename traits::point_type<Geometry>::type
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>::type type;
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};
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// Specialization for point: the point itself
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template <typename Point>
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struct point_type<point_tag, Point>
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{
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typedef Point type;
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};
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// Specializations for linestring/ring, via boost::range
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template <typename Linestring>
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struct point_type<linestring_tag, Linestring>
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{
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typedef typename boost::range_value<Linestring>::type type;
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};
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template <typename Ring>
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struct point_type<ring_tag, Ring>
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{
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typedef typename boost::range_value<Ring>::type type;
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};
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// Specialization for polygon: the point-type is the point-type of its rings
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template <typename Polygon>
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struct point_type<polygon_tag, Polygon>
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{
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typedef typename point_type
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<
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ring_tag,
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typename ring_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 // DOXYGEN_NO_DISPATCH
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/*!
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\brief \brief_meta{type, point_type, \meta_geometry_type}
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\tparam Geometry \tparam_geometry
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\ingroup core
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\qbk{[include reference/core/point_type.qbk]}
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*/
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template <typename Geometry>
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struct point_type
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{
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typedef typename core_dispatch::point_type
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<
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typename tag<Geometry>::type,
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typename boost::geometry::util::bare_type<Geometry>::type
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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_POINT_TYPE_HPP
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