96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
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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/mpl/assert.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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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 <typename Tag, typename Geometry>
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struct num_geometries
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{
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BOOST_MPL_ASSERT_MSG
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(
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false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
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, (types<Geometry>)
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);
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};
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template <typename Geometry>
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struct num_geometries<single_tag, Geometry>
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{
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static inline std::size_t apply(Geometry const&)
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{
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return 1;
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}
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};
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} // namespace dispatch
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#endif
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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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concept::check<Geometry const>();
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return dispatch::num_geometries
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<
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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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Geometry
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>::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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