108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
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// Boost.Geometry Index
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//
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// R-tree visitor collecting basic statistics
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//
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// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
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// Copyright (c) 2013 Mateusz Loskot, London, UK.
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//
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// This file was modified by Oracle on 2019-2020.
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// Modifications copyright (c) 2019-2020 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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//
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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_RTREE_UTILITIES_STATISTICS_HPP
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#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_STATISTICS_HPP
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#include <algorithm>
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#include <tuple>
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namespace boost { namespace geometry { namespace index { namespace detail { namespace rtree { namespace utilities {
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namespace visitors {
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template <typename MembersHolder>
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struct statistics
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: public MembersHolder::visitor_const
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{
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typedef typename MembersHolder::internal_node internal_node;
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typedef typename MembersHolder::leaf leaf;
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inline statistics()
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: level(0)
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, levels(1) // count root
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, nodes(0)
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, leaves(0)
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, values(0)
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, values_min(0)
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, values_max(0)
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{}
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inline void operator()(internal_node const& n)
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{
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typedef typename rtree::elements_type<internal_node>::type elements_type;
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elements_type const& elements = rtree::elements(n);
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++nodes; // count node
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size_t const level_backup = level;
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++level;
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levels += level++ > levels ? 1 : 0; // count level (root already counted)
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for (typename elements_type::const_iterator it = elements.begin();
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it != elements.end(); ++it)
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{
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rtree::apply_visitor(*this, *it->second);
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}
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level = level_backup;
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}
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inline void operator()(leaf const& n)
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{
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typedef typename rtree::elements_type<leaf>::type elements_type;
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elements_type const& elements = rtree::elements(n);
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++leaves; // count leaves
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std::size_t const v = elements.size();
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// count values spread per node and total
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values_min = (std::min)(values_min == 0 ? v : values_min, v);
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values_max = (std::max)(values_max, v);
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values += v;
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}
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std::size_t level;
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std::size_t levels;
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std::size_t nodes;
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std::size_t leaves;
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std::size_t values;
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std::size_t values_min;
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std::size_t values_max;
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};
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} // namespace visitors
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template <typename Rtree> inline
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std::tuple<std::size_t, std::size_t, std::size_t, std::size_t, std::size_t, std::size_t>
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statistics(Rtree const& tree)
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{
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typedef utilities::view<Rtree> RTV;
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RTV rtv(tree);
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visitors::statistics<
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typename RTV::members_holder
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> stats_v;
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rtv.apply_visitor(stats_v);
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return std::make_tuple(stats_v.levels, stats_v.nodes, stats_v.leaves, stats_v.values, stats_v.values_min, stats_v.values_max);
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}
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}}}}}} // namespace boost::geometry::index::detail::rtree::utilities
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#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_STATISTICS_HPP
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