boost/geometry/core/topological_dimension.hpp
// 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. // Copyright (c) 2024 Adam Wulkiewicz, Lodz, Poland. // This file was modified by Oracle on 2020-2022. // Modifications copyright (c) 2020-2022, Oracle and/or its affiliates. // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle // 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_TOPOLOGICAL_DIMENSION_HPP #define BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP #include <type_traits> #include <boost/geometry/core/tag.hpp> #include <boost/geometry/core/tags.hpp> namespace boost { namespace geometry { #ifndef DOXYGEN_NO_DISPATCH namespace core_dispatch { template <typename GeometryTag> struct top_dim {}; template <> struct top_dim<point_tag> : std::integral_constant<int, 0> {}; template <> struct top_dim<linestring_tag> : std::integral_constant<int, 1> {}; template <> struct top_dim<segment_tag> : std::integral_constant<int, 1> {}; // ring: topological dimension of two, but some people say: 1 !! // NOTE: This is not OGC LinearRing! template <> struct top_dim<ring_tag> : std::integral_constant<int, 2> {}; // TODO: This is wrong! Boxes may have various topological dimensions template <> struct top_dim<box_tag> : std::integral_constant<int, 2> {}; template <> struct top_dim<polygon_tag> : std::integral_constant<int, 2> {}; template <> struct top_dim<multi_point_tag> : std::integral_constant<int, 0> {}; template <> struct top_dim<multi_linestring_tag> : std::integral_constant<int, 1> {}; template <> struct top_dim<multi_polygon_tag> : std::integral_constant<int, 2> {}; template <> struct top_dim<geometry_collection_tag> : std::integral_constant<int, -1> {}; } // namespace core_dispatch #endif /*! \brief Meta-function returning the topological dimension of a geometry \details The topological dimension defines a point as 0-dimensional, a linestring as 1-dimensional, and a ring or polygon as 2-dimensional. \see http://www.math.okstate.edu/mathdept/dynamics/lecnotes/node36.html \ingroup core */ template <typename Geometry> struct topological_dimension : core_dispatch::top_dim<typename tag<Geometry>::type> {}; #ifndef BOOST_NO_CXX17_INLINE_VARIABLES template <typename Geometry> inline constexpr int topological_dimension_v = topological_dimension<Geometry>::value; #endif }} // namespace boost::geometry #endif // BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP