142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2014-2020.
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// Modifications copyright (c) 2014-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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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_ALGORITHMS_NUM_GEOMETRIES_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_NUM_GEOMETRIES_HPP
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#include <cstddef>
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#include <boost/range/size.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/algorithms/not_implemented.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/tag_cast.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/algorithms/detail/counting.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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template
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<
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typename Geometry,
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typename Tag = typename tag_cast
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<
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typename tag<Geometry>::type,
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single_tag,
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multi_tag
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>::type
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>
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struct num_geometries: not_implemented<Tag>
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{};
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template <typename Geometry>
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struct num_geometries<Geometry, single_tag>
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: detail::counting::other_count<1>
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{};
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template <typename MultiGeometry>
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struct num_geometries<MultiGeometry, multi_tag>
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{
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static inline std::size_t apply(MultiGeometry const& multi_geometry)
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{
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return boost::size(multi_geometry);
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}
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};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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namespace resolve_variant
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{
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template <typename Geometry>
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struct num_geometries
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{
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static inline std::size_t apply(Geometry const& geometry)
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{
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concepts::check<Geometry const>();
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return dispatch::num_geometries<Geometry>::apply(geometry);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct num_geometries<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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struct visitor: boost::static_visitor<std::size_t>
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{
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template <typename Geometry>
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inline std::size_t operator()(Geometry const& geometry) const
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{
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return num_geometries<Geometry>::apply(geometry);
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}
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};
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static inline std::size_t
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apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry)
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{
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return boost::apply_visitor(visitor(), geometry);
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}
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};
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} // namespace resolve_variant
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/*!
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\brief \brief_calc{number of geometries}
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\ingroup num_geometries
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\details \details_calc{num_geometries, number of geometries}.
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry
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\return \return_calc{number of geometries}
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\qbk{[include reference/algorithms/num_geometries.qbk]}
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*/
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template <typename Geometry>
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inline std::size_t num_geometries(Geometry const& geometry)
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{
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return resolve_variant::num_geometries<Geometry>::apply(geometry);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_NUM_GEOMETRIES_HPP
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