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95 lines
2.2 KiB
95 lines
2.2 KiB
// 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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