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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_TAG_HPP
- #define 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 to attach a tag to a geometry
- \details All geometries should implement a traits::tag<G>::type metafunction to indicate their
- own geometry type.
- \ingroup traits
- \par Geometries:
- - all geometries
- \par Specializations should provide:
- - typedef XXX_tag type; (point_tag, box_tag, ...)
- \tparam Geometry geometry
- */
- template <typename Geometry, typename Enable = void>
- struct tag
- {
- typedef void type;
- };
- } // namespace traits
- /*!
- \brief \brief_meta{type, tag, \meta_geometry_type}
- \details With Boost.Geometry, tags are the driving force of the tag dispatching
- mechanism. The tag metafunction is therefore used in every free function.
- \tparam Geometry \tparam_geometry
- \ingroup core
- \qbk{[include reference/core/tag.qbk]}
- */
- template <typename Geometry>
- struct tag
- {
- typedef typename traits::tag
- <
- typename geometry::util::bare_type<Geometry>::type
- >::type type;
- };
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_CORE_TAG_HPP
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