| 1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
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| 2 | |
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| 3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. |
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| 4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. |
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| 5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. |
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| 6 | |
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| 7 | // This file was modified by Oracle on 2020. |
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| 8 | // Modifications copyright (c) 2020 Oracle and/or its affiliates. |
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| 9 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle |
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| 10 | |
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| 11 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
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| 12 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
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| 13 | |
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| 14 | // Use, modification and distribution is subject to the Boost Software License, |
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| 15 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 16 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 17 | |
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| 18 | #ifndef BOOST_GEOMETRY_CORE_TAG_HPP |
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| 19 | #define BOOST_GEOMETRY_CORE_TAG_HPP |
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| 20 | |
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| 21 | |
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| 22 | #include <boost/geometry/core/tags.hpp> |
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| 23 | #include <boost/geometry/util/type_traits_std.hpp> |
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| 24 | |
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| 25 | |
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| 26 | namespace boost { namespace geometry |
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| 27 | { |
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| 28 | |
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| 29 | namespace traits |
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| 30 | { |
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| 31 | |
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| 32 | /*! |
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| 33 | \brief Traits class to attach a tag to a geometry |
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| 34 | \details All geometries should implement a traits::tag<G>::type metafunction to indicate their |
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| 35 | own geometry type. |
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| 36 | \ingroup traits |
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| 37 | \par Geometries: |
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| 38 | - all geometries |
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| 39 | \par Specializations should provide: |
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| 40 | - typedef XXX_tag type; (point_tag, box_tag, ...) |
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| 41 | \tparam Geometry geometry |
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| 42 | */ |
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| 43 | template <typename Geometry, typename Enable = void> |
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| 44 | struct tag |
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| 45 | { |
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| 46 | typedef void type; |
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| 47 | }; |
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| 48 | |
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| 49 | } // namespace traits |
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| 50 | |
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| 51 | |
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| 52 | |
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| 53 | /*! |
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| 54 | \brief \brief_meta{type, tag, \meta_geometry_type} |
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| 55 | \details With Boost.Geometry, tags are the driving force of the tag dispatching |
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| 56 | mechanism. The tag metafunction is therefore used in every free function. |
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| 57 | \tparam Geometry \tparam_geometry |
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| 58 | \ingroup core |
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| 59 | |
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| 60 | \qbk{[include reference/core/tag.qbk]} |
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| 61 | */ |
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| 62 | template <typename Geometry> |
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| 63 | struct tag |
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| 64 | { |
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| 65 | typedef typename traits::tag |
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| 66 | < |
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| 67 | typename util::remove_cptrref<Geometry>::type |
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| 68 | >::type type; |
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| 69 | }; |
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| 70 | |
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| 71 | }} // namespace boost::geometry |
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| 72 | |
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| 73 | #endif // BOOST_GEOMETRY_CORE_TAG_HPP |
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| 74 | |
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