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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.
// 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> {};
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP
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