geometry/core/geometry_id.hpp

0001 // Boost.Geometry (aka GGL, Generic Geometry Library)
0002
0003 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
0004 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
0005 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
0006
0007 // This file was modified by Oracle on 2020.
0008 // Modifications copyright (c) 2020 Oracle and/or its affiliates.
0009 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0010
0011 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
0012 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
0013
0014 // Use, modification and distribution is subject to the Boost Software License,
0015 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0016 // http://www.boost.org/LICENSE_1_0.txt)
0017
0018
0019 #ifndef BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP
0020 #define BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP
0021
0022
0023 #include <type_traits>
0024
0025 #include <boost/geometry/core/static_assert.hpp>
0026 #include <boost/geometry/core/tag.hpp>
0027 #include <boost/geometry/core/tags.hpp>
0028
0029
0030 namespace boost { namespace geometry
0031 {
0032
0033
0034 #ifndef DOXYGEN_NO_DISPATCH
0035 namespace core_dispatch
0036 {
0037
0038 template <typename GeometryTag>
0039 struct geometry_id
0040 {
0041     BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
0042         "Not implemented for this Geometry type.",
0043         GeometryTag);
0044 };
0045
0046
0047 template <>
0048 struct geometry_id<point_tag>               : std::integral_constant<int, 1> {};
0049
0050
0051 template <>
0052 struct geometry_id<linestring_tag>          : std::integral_constant<int, 2> {};
0053
0054
0055 template <>
0056 struct geometry_id<polygon_tag>             : std::integral_constant<int, 3> {};
0057
0058
0059 template <>
0060 struct geometry_id<multi_point_tag>         : std::integral_constant<int, 4> {};
0061
0062
0063 template <>
0064 struct geometry_id<multi_linestring_tag>    : std::integral_constant<int, 5> {};
0065
0066
0067 template <>
0068 struct geometry_id<multi_polygon_tag>       : std::integral_constant<int, 6> {};
0069
0070
0071 template <>
0072 struct geometry_id<geometry_collection_tag> : std::integral_constant<int, 7> {};
0073
0074
0075 template <>
0076 struct geometry_id<segment_tag>             : std::integral_constant<int, 92> {};
0077
0078
0079 template <>
0080 struct geometry_id<ring_tag>                : std::integral_constant<int, 93> {};
0081
0082
0083 template <>
0084 struct geometry_id<box_tag>                 : std::integral_constant<int, 94> {};
0085
0086
0087 } // namespace core_dispatch
0088 #endif
0089
0090
0091
0092 /*!
0093 \brief Meta-function returning the id of a geometry type
0094 \details The meta-function geometry_id defines a numerical ID (based on
0095     std::integral_constant<int, ...> ) for each geometry concept. A numerical ID is
0096     sometimes useful, and within Boost.Geometry it is used for the
0097     reverse_dispatch metafuntion.
0098 \note Used for e.g. reverse meta-function
0099 \ingroup core
0100 */
0101 template <typename Geometry>
0102 struct geometry_id : core_dispatch::geometry_id<typename tag<Geometry>::type>
0103 {};
0104
0105
0106 }} // namespace boost::geometry
0107
0108
0109 #endif // BOOST_GEOMETRY_CORE_GEOMETRY_ID_HPP