// Boost.Geometry Index
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//
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// R-tree query iterators
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//
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// Copyright (c) 2011-2015 Adam Wulkiewicz, Lodz, Poland.
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//
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// This file was modified by Oracle on 2019.
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// Modifications copyright (c) 2019 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_QUERY_ITERATORS_HPP
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#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_QUERY_ITERATORS_HPP
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#include <boost/scoped_ptr.hpp>
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//#define BOOST_GEOMETRY_INDEX_DETAIL_QUERY_ITERATORS_USE_MOVE
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namespace boost { namespace geometry { namespace index { namespace detail { namespace rtree { namespace iterators {
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template <typename Value, typename Allocators>
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struct end_query_iterator
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{
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typedef std::forward_iterator_tag iterator_category;
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typedef Value value_type;
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typedef typename Allocators::const_reference reference;
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typedef typename Allocators::difference_type difference_type;
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typedef typename Allocators::const_pointer pointer;
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reference operator*() const
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{
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BOOST_GEOMETRY_INDEX_ASSERT(false, "iterator not dereferencable");
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pointer p(0);
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return *p;
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}
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const value_type * operator->() const
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{
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BOOST_GEOMETRY_INDEX_ASSERT(false, "iterator not dereferencable");
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const value_type * p = 0;
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return p;
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}
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end_query_iterator & operator++()
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{
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BOOST_GEOMETRY_INDEX_ASSERT(false, "iterator not incrementable");
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return *this;
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}
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end_query_iterator operator++(int)
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{
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BOOST_GEOMETRY_INDEX_ASSERT(false, "iterator not incrementable");
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return *this;
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}
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friend bool operator==(end_query_iterator const& /*l*/, end_query_iterator const& /*r*/)
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{
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return true;
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}
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};
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template <typename MembersHolder, typename Predicates>
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class spatial_query_iterator
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{
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typedef typename MembersHolder::parameters_type parameters_type;
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typedef typename MembersHolder::translator_type translator_type;
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typedef typename MembersHolder::allocators_type allocators_type;
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typedef visitors::spatial_query_incremental<MembersHolder, Predicates> visitor_type;
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typedef typename visitor_type::node_pointer node_pointer;
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef typename MembersHolder::value_type value_type;
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typedef typename allocators_type::const_reference reference;
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typedef typename allocators_type::difference_type difference_type;
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typedef typename allocators_type::const_pointer pointer;
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inline spatial_query_iterator()
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{}
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inline spatial_query_iterator(parameters_type const& par, translator_type const& t, Predicates const& p)
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: m_visitor(par, t, p)
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{}
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inline spatial_query_iterator(node_pointer root, parameters_type const& par, translator_type const& t, Predicates const& p)
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: m_visitor(par, t, p)
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{
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m_visitor.initialize(root);
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}
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reference operator*() const
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{
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return m_visitor.dereference();
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}
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const value_type * operator->() const
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{
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return boost::addressof(m_visitor.dereference());
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}
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spatial_query_iterator & operator++()
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{
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m_visitor.increment();
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return *this;
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}
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spatial_query_iterator operator++(int)
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{
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spatial_query_iterator temp = *this;
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this->operator++();
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return temp;
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}
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friend bool operator==(spatial_query_iterator const& l, spatial_query_iterator const& r)
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{
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return l.m_visitor == r.m_visitor;
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}
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friend bool operator==(spatial_query_iterator const& l, end_query_iterator<value_type, allocators_type> const& /*r*/)
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{
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return l.m_visitor.is_end();
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}
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friend bool operator==(end_query_iterator<value_type, allocators_type> const& /*l*/, spatial_query_iterator const& r)
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{
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return r.m_visitor.is_end();
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}
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private:
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visitor_type m_visitor;
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};
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template <typename MembersHolder, typename Predicates, unsigned NearestPredicateIndex>
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class distance_query_iterator
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{
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typedef typename MembersHolder::parameters_type parameters_type;
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typedef typename MembersHolder::translator_type translator_type;
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typedef typename MembersHolder::allocators_type allocators_type;
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typedef visitors::distance_query_incremental<MembersHolder, Predicates, NearestPredicateIndex> visitor_type;
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typedef typename visitor_type::node_pointer node_pointer;
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef typename MembersHolder::value_type value_type;
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typedef typename allocators_type::const_reference reference;
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typedef typename allocators_type::difference_type difference_type;
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typedef typename allocators_type::const_pointer pointer;
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inline distance_query_iterator()
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{}
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inline distance_query_iterator(parameters_type const& par, translator_type const& t, Predicates const& p)
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: m_visitor(par, t, p)
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{}
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inline distance_query_iterator(node_pointer root, parameters_type const& par, translator_type const& t, Predicates const& p)
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: m_visitor(par, t, p)
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{
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m_visitor.initialize(root);
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}
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reference operator*() const
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{
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return m_visitor.dereference();
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}
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const value_type * operator->() const
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{
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return boost::addressof(m_visitor.dereference());
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}
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distance_query_iterator & operator++()
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{
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m_visitor.increment();
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return *this;
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}
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distance_query_iterator operator++(int)
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{
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distance_query_iterator temp = *this;
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this->operator++();
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return temp;
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}
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friend bool operator==(distance_query_iterator const& l, distance_query_iterator const& r)
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{
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return l.m_visitor == r.m_visitor;
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}
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friend bool operator==(distance_query_iterator const& l, end_query_iterator<value_type, allocators_type> const& /*r*/)
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{
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return l.m_visitor.is_end();
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}
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friend bool operator==(end_query_iterator<value_type, allocators_type> const& /*l*/, distance_query_iterator const& r)
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{
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return r.m_visitor.is_end();
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}
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private:
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visitor_type m_visitor;
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};
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template <typename L, typename R>
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inline bool operator!=(L const& l, R const& r)
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{
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return !(l == r);
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}
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template <typename Value, typename Allocators>
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class query_iterator_base
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{
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef Value value_type;
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typedef typename Allocators::const_reference reference;
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typedef typename Allocators::difference_type difference_type;
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typedef typename Allocators::const_pointer pointer;
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virtual ~query_iterator_base() {}
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virtual query_iterator_base * clone() const = 0;
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virtual bool is_end() const = 0;
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virtual reference dereference() const = 0;
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virtual void increment() = 0;
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virtual bool equals(query_iterator_base const&) const = 0;
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};
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template <typename Value, typename Allocators, typename Iterator>
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class query_iterator_wrapper
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: public query_iterator_base<Value, Allocators>
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{
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typedef query_iterator_base<Value, Allocators> base_t;
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef Value value_type;
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typedef typename Allocators::const_reference reference;
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typedef typename Allocators::difference_type difference_type;
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typedef typename Allocators::const_pointer pointer;
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query_iterator_wrapper() : m_iterator() {}
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explicit query_iterator_wrapper(Iterator const& it) : m_iterator(it) {}
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virtual base_t * clone() const { return new query_iterator_wrapper(m_iterator); }
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virtual bool is_end() const { return m_iterator == end_query_iterator<Value, Allocators>(); }
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virtual reference dereference() const { return *m_iterator; }
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virtual void increment() { ++m_iterator; }
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virtual bool equals(base_t const& r) const
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{
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const query_iterator_wrapper * p = dynamic_cast<const query_iterator_wrapper *>(boost::addressof(r));
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BOOST_GEOMETRY_INDEX_ASSERT(p, "iterators can't be compared");
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return m_iterator == p->m_iterator;
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}
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private:
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Iterator m_iterator;
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};
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template <typename Value, typename Allocators>
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class query_iterator
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{
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typedef query_iterator_base<Value, Allocators> iterator_base;
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typedef boost::scoped_ptr<iterator_base> iterator_ptr;
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public:
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typedef std::forward_iterator_tag iterator_category;
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typedef Value value_type;
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typedef typename Allocators::const_reference reference;
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typedef typename Allocators::difference_type difference_type;
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typedef typename Allocators::const_pointer pointer;
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query_iterator()
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{}
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template <typename It>
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query_iterator(It const& it)
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: m_ptr(static_cast<iterator_base*>(
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new query_iterator_wrapper<Value, Allocators, It>(it) ))
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{}
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query_iterator(end_query_iterator<Value, Allocators> const& /*it*/)
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{}
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query_iterator(query_iterator const& o)
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: m_ptr(o.m_ptr.get() ? o.m_ptr->clone() : 0)
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{}
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#ifndef BOOST_GEOMETRY_INDEX_DETAIL_QUERY_ITERATORS_USE_MOVE
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query_iterator & operator=(query_iterator const& o)
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{
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if ( this != boost::addressof(o) )
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{
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m_ptr.reset(o.m_ptr.get() ? o.m_ptr->clone() : 0);
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}
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return *this;
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}
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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query_iterator(query_iterator && o)
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: m_ptr(0)
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{
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m_ptr.swap(o.m_ptr);
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}
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query_iterator & operator=(query_iterator && o)
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{
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if ( this != boost::addressof(o) )
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{
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m_ptr.swap(o.m_ptr);
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o.m_ptr.reset();
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}
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return *this;
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}
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#endif
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#else // !BOOST_GEOMETRY_INDEX_DETAIL_QUERY_ITERATORS_USE_MOVE
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private:
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BOOST_COPYABLE_AND_MOVABLE(query_iterator)
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public:
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query_iterator & operator=(BOOST_COPY_ASSIGN_REF(query_iterator) o)
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{
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if ( this != boost::addressof(o) )
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{
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m_ptr.reset(o.m_ptr.get() ? o.m_ptr->clone() : 0);
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}
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return *this;
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}
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query_iterator(BOOST_RV_REF(query_iterator) o)
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: m_ptr(0)
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{
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m_ptr.swap(o.m_ptr);
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}
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query_iterator & operator=(BOOST_RV_REF(query_iterator) o)
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{
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if ( this != boost::addressof(o) )
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{
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m_ptr.swap(o.m_ptr);
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o.m_ptr.reset();
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}
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return *this;
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}
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#endif // BOOST_GEOMETRY_INDEX_DETAIL_QUERY_ITERATORS_USE_MOVE
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reference operator*() const
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{
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return m_ptr->dereference();
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}
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const value_type * operator->() const
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{
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return boost::addressof(m_ptr->dereference());
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}
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query_iterator & operator++()
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{
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m_ptr->increment();
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return *this;
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}
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query_iterator operator++(int)
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{
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query_iterator temp = *this;
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this->operator++();
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return temp;
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}
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friend bool operator==(query_iterator const& l, query_iterator const& r)
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{
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if ( l.m_ptr.get() )
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{
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if ( r.m_ptr.get() )
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return l.m_ptr->equals(*r.m_ptr);
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else
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return l.m_ptr->is_end();
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}
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else
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{
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if ( r.m_ptr.get() )
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return r.m_ptr->is_end();
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else
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return true;
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}
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}
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private:
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iterator_ptr m_ptr;
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};
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}}}}}} // namespace boost::geometry::index::detail::rtree::iterators
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#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_QUERY_ITERATORS_HPP
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