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