95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// This file was modified by Oracle on 2013-2020.
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// Modifications copyright (c) 2013-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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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_DETAIL_SINGLE_GEOMETRY_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
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#include <type_traits>
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#include <boost/geometry/core/assert.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/util/range.hpp>
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namespace boost { namespace geometry {
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#ifndef DOXYGEN_NO_DISPATCH
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namespace detail_dispatch {
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// Returns single geometry by Id
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// for single geometries returns the geometry itself
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template
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<
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typename Geometry,
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bool IsMulti = std::is_base_of
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<
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multi_tag,
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typename geometry::tag<Geometry>::type
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>::value
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>
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struct single_geometry
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{
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typedef Geometry & return_type;
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template <typename Id>
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static inline return_type apply(Geometry & g, Id const& ) { return g; }
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};
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// for multi geometries returns one of the stored single geometries
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template <typename Geometry>
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struct single_geometry<Geometry, true>
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{
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typedef typename boost::range_reference<Geometry>::type return_type;
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template <typename Id>
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static inline return_type apply(Geometry & g, Id const& id)
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{
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BOOST_GEOMETRY_ASSERT(id.multi_index >= 0);
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typedef typename boost::range_size<Geometry>::type size_type;
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return range::at(g, static_cast<size_type>(id.multi_index));
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}
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};
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} // namespace detail_dispatch
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#endif // DOXYGEN_NO_DISPATCH
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail {
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template <typename Geometry>
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struct single_geometry_return_type
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{
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typedef typename detail_dispatch::single_geometry<Geometry>::return_type type;
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};
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template <typename Geometry, typename Id>
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inline
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typename single_geometry_return_type<Geometry>::type
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single_geometry(Geometry & geometry, Id const& id)
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{
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return detail_dispatch::single_geometry<Geometry>::apply(geometry, id);
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}
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template <typename Geometry, typename Id>
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inline
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typename single_geometry_return_type<Geometry const>::type
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single_geometry(Geometry const& geometry, Id const& id)
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{
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return detail_dispatch::single_geometry<Geometry const>::apply(geometry, id);
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}
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
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