// 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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// This file was modified by Oracle on 2020.
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// Modifications copyright (c) 2020 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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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_TAG_HPP
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#define BOOST_GEOMETRY_CORE_TAG_HPP
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/util/type_traits_std.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 attach a tag to a geometry
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\details All geometries should implement a traits::tag<G>::type metafunction to indicate their
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own geometry type.
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\ingroup traits
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\par Geometries:
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- all geometries
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\par Specializations should provide:
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- typedef XXX_tag type; (point_tag, box_tag, ...)
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\tparam Geometry geometry
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*/
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template <typename Geometry, typename Enable = void>
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struct tag
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{
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typedef void type;
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};
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} // namespace traits
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/*!
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\brief \brief_meta{type, tag, \meta_geometry_type}
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\details With Boost.Geometry, tags are the driving force of the tag dispatching
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mechanism. The tag metafunction is therefore used in every free function.
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\tparam Geometry \tparam_geometry
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\ingroup core
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\qbk{[include reference/core/tag.qbk]}
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*/
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template <typename Geometry>
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struct tag
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{
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typedef typename traits::tag
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<
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typename util::remove_cptrref<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_TAG_HPP
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