102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
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// Boost.Geometry Index
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//
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// n-dimensional content (hypervolume) - 2d area, 3d volume, ...
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//
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// Copyright (c) 2011-2014 Adam Wulkiewicz, Lodz, Poland.
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//
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// This file was modified by Oracle on 2020-2022.
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// Modifications copyright (c) 2020-2022 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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//
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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_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
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#define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/static_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/util/select_most_precise.hpp>
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namespace boost { namespace geometry { namespace index { namespace detail {
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template <typename Indexable>
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struct default_content_result
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{
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using type = typename select_most_precise
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<
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typename coordinate_type<Indexable>::type,
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double
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>::type;
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};
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namespace dispatch {
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template <typename Box,
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std::size_t CurrentDimension = dimension<Box>::value>
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struct content_box
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{
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BOOST_STATIC_ASSERT(0 < CurrentDimension);
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static inline typename detail::default_content_result<Box>::type apply(Box const& b)
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{
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return content_box<Box, CurrentDimension - 1>::apply(b) *
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( get<max_corner, CurrentDimension - 1>(b) - get<min_corner, CurrentDimension - 1>(b) );
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}
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};
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template <typename Box>
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struct content_box<Box, 1>
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{
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static inline typename detail::default_content_result<Box>::type apply(Box const& b)
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{
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return get<max_corner, 0>(b) - get<min_corner, 0>(b);
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}
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};
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template <typename Indexable, typename Tag>
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struct content
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{
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BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
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"Not implemented for this Indexable and Tag.",
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Indexable, Tag);
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};
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template <typename Indexable>
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struct content<Indexable, point_tag>
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{
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static typename detail::default_content_result<Indexable>::type apply(Indexable const&)
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{
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return 0;
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}
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};
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template <typename Indexable>
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struct content<Indexable, box_tag>
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{
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static typename default_content_result<Indexable>::type apply(Indexable const& b)
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{
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return dispatch::content_box<Indexable>::apply(b);
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}
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};
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} // namespace dispatch
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template <typename Indexable>
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typename default_content_result<Indexable>::type content(Indexable const& b)
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{
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return dispatch::content
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<
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Indexable,
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typename tag<Indexable>::type
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>::apply(b);
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}
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}}}} // namespace boost::geometry::index::detail
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#endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
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