308 lines
10 KiB
C++
308 lines
10 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2007-2013
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (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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//
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// See http://www.boost.org/libs/intrusive for documentation.
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTRUSIVE_HASHTABLE_NODE_HPP
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#define BOOST_INTRUSIVE_HASHTABLE_NODE_HPP
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#include <boost/intrusive/detail/config_begin.hpp>
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#include <iterator>
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#include <boost/intrusive/detail/assert.hpp>
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#include <boost/intrusive/pointer_traits.hpp>
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#include <boost/intrusive/circular_list_algorithms.hpp>
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#include <boost/intrusive/detail/mpl.hpp>
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#include <boost/intrusive/detail/utilities.hpp>
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#include <boost/intrusive/slist.hpp> //remove-me
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#include <boost/intrusive/pointer_traits.hpp>
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#include <boost/intrusive/trivial_value_traits.hpp>
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#include <cstddef>
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#include <boost/type_traits/make_unsigned.hpp>
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#include <boost/pointer_cast.hpp>
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#include <boost/move/core.hpp>
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namespace boost {
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namespace intrusive {
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namespace detail {
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template<int Dummy = 0>
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struct prime_list_holder
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{
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static const std::size_t prime_list[];
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static const std::size_t prime_list_size;
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};
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template<int Dummy>
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const std::size_t prime_list_holder<Dummy>::prime_list[] = {
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3ul, 7ul, 11ul, 17ul, 29ul,
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53ul, 97ul, 193ul, 389ul, 769ul,
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1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
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49157ul, 98317ul, 196613ul, 393241ul, 786433ul,
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1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul,
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50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,
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1610612741ul, 3221225473ul, 4294967291ul };
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template<int Dummy>
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const std::size_t prime_list_holder<Dummy>::prime_list_size
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= sizeof(prime_list)/sizeof(std::size_t);
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template <class Slist>
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struct bucket_impl : public Slist
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{
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typedef Slist slist_type;
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bucket_impl()
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{}
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bucket_impl(const bucket_impl &)
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{}
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~bucket_impl()
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{
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//This bucket is still being used!
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BOOST_INTRUSIVE_INVARIANT_ASSERT(Slist::empty());
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}
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bucket_impl &operator=(const bucket_impl&)
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{
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//This bucket is still in use!
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BOOST_INTRUSIVE_INVARIANT_ASSERT(Slist::empty());
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//Slist::clear();
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return *this;
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}
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};
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template<class Slist>
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struct bucket_traits_impl
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{
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private:
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BOOST_COPYABLE_AND_MOVABLE(bucket_traits_impl)
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public:
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/// @cond
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typedef typename pointer_traits
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<typename Slist::pointer>::template rebind_pointer
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< bucket_impl<Slist> >::type bucket_ptr;
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typedef Slist slist;
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typedef typename Slist::size_type size_type;
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/// @endcond
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bucket_traits_impl(bucket_ptr buckets, size_type len)
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: buckets_(buckets), buckets_len_(len)
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{}
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bucket_traits_impl(const bucket_traits_impl &x)
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: buckets_(x.buckets_), buckets_len_(x.buckets_len_)
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{}
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bucket_traits_impl(BOOST_RV_REF(bucket_traits_impl) x)
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: buckets_(x.buckets_), buckets_len_(x.buckets_len_)
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{ x.buckets_ = bucket_ptr(); x.buckets_len_ = 0; }
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bucket_traits_impl& operator=(BOOST_RV_REF(bucket_traits_impl) x)
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{
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buckets_ = x.buckets_; buckets_len_ = x.buckets_len_;
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x.buckets_ = bucket_ptr(); x.buckets_len_ = 0; return *this;
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}
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bucket_traits_impl& operator=(BOOST_COPY_ASSIGN_REF(bucket_traits_impl) x)
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{
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buckets_ = x.buckets_; buckets_len_ = x.buckets_len_; return *this;
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}
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const bucket_ptr &bucket_begin() const
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{ return buckets_; }
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size_type bucket_count() const
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{ return buckets_len_; }
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private:
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bucket_ptr buckets_;
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size_type buckets_len_;
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};
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template <class NodeTraits>
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struct hash_reduced_slist_node_traits
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{
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template <class U> static detail::one test(...);
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template <class U> static detail::two test(typename U::reduced_slist_node_traits* = 0);
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static const bool value = sizeof(test<NodeTraits>(0)) == sizeof(detail::two);
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};
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template <class NodeTraits>
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struct apply_reduced_slist_node_traits
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{
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typedef typename NodeTraits::reduced_slist_node_traits type;
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};
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template <class NodeTraits>
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struct reduced_slist_node_traits
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{
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typedef typename detail::eval_if_c
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< hash_reduced_slist_node_traits<NodeTraits>::value
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, apply_reduced_slist_node_traits<NodeTraits>
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, detail::identity<NodeTraits>
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>::type type;
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};
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template<class NodeTraits>
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struct get_slist_impl
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{
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typedef trivial_value_traits<NodeTraits, normal_link> trivial_traits;
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//Reducing symbol length
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struct type : make_slist
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< typename NodeTraits::node
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, boost::intrusive::value_traits<trivial_traits>
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, boost::intrusive::constant_time_size<false>
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, boost::intrusive::size_type<typename boost::make_unsigned
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<typename pointer_traits<typename NodeTraits::node_ptr>::difference_type>::type >
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>::type
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{};
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};
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} //namespace detail {
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template<class BucketValueTraits, bool IsConst>
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class hashtable_iterator
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: public std::iterator
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< std::forward_iterator_tag
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, typename BucketValueTraits::real_value_traits::value_type
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, typename pointer_traits<typename BucketValueTraits::real_value_traits::value_type*>::difference_type
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, typename detail::add_const_if_c
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<typename BucketValueTraits::real_value_traits::value_type, IsConst>::type *
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, typename detail::add_const_if_c
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<typename BucketValueTraits::real_value_traits::value_type, IsConst>::type &
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>
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{
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typedef typename BucketValueTraits::real_value_traits real_value_traits;
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typedef typename BucketValueTraits::real_bucket_traits real_bucket_traits;
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typedef typename real_value_traits::node_traits node_traits;
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typedef typename detail::get_slist_impl
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<typename detail::reduced_slist_node_traits
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<typename real_value_traits::node_traits>::type
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>::type slist_impl;
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typedef typename slist_impl::iterator siterator;
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typedef typename slist_impl::const_iterator const_siterator;
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typedef detail::bucket_impl<slist_impl> bucket_type;
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typedef typename pointer_traits
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<typename real_value_traits::pointer>::template rebind_pointer
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< const BucketValueTraits >::type const_bucketvaltraits_ptr;
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typedef typename slist_impl::size_type size_type;
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static typename node_traits::node_ptr downcast_bucket(typename bucket_type::node_ptr p)
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{
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return pointer_traits<typename node_traits::node_ptr>::
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pointer_to(static_cast<typename node_traits::node&>(*p));
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}
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public:
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typedef typename real_value_traits::value_type value_type;
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typedef typename detail::add_const_if_c<value_type, IsConst>::type *pointer;
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typedef typename detail::add_const_if_c<value_type, IsConst>::type &reference;
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hashtable_iterator ()
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{}
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explicit hashtable_iterator(siterator ptr, const BucketValueTraits *cont)
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: slist_it_ (ptr), traitsptr_ (cont ? pointer_traits<const_bucketvaltraits_ptr>::pointer_to(*cont) : const_bucketvaltraits_ptr() )
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{}
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hashtable_iterator(const hashtable_iterator<BucketValueTraits, false> &other)
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: slist_it_(other.slist_it()), traitsptr_(other.get_bucket_value_traits())
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{}
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const siterator &slist_it() const
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{ return slist_it_; }
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hashtable_iterator<BucketValueTraits, false> unconst() const
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{ return hashtable_iterator<BucketValueTraits, false>(this->slist_it(), this->get_bucket_value_traits()); }
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public:
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hashtable_iterator& operator++()
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{ this->increment(); return *this; }
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hashtable_iterator operator++(int)
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{
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hashtable_iterator result (*this);
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this->increment();
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return result;
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}
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friend bool operator== (const hashtable_iterator& i, const hashtable_iterator& i2)
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{ return i.slist_it_ == i2.slist_it_; }
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friend bool operator!= (const hashtable_iterator& i, const hashtable_iterator& i2)
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{ return !(i == i2); }
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reference operator*() const
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{ return *this->operator ->(); }
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pointer operator->() const
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{
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return boost::intrusive::detail::to_raw_pointer(this->priv_real_value_traits().to_value_ptr
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(downcast_bucket(slist_it_.pointed_node())));
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}
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const const_bucketvaltraits_ptr &get_bucket_value_traits() const
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{ return traitsptr_; }
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const real_value_traits &priv_real_value_traits() const
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{ return traitsptr_->priv_real_value_traits(); }
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const real_bucket_traits &priv_real_bucket_traits() const
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{ return traitsptr_->priv_real_bucket_traits(); }
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private:
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void increment()
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{
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const real_bucket_traits &rbuck_traits = this->priv_real_bucket_traits();
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bucket_type* const buckets = boost::intrusive::detail::to_raw_pointer(rbuck_traits.bucket_begin());
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const size_type buckets_len = rbuck_traits.bucket_count();
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++slist_it_;
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const typename slist_impl::node_ptr n = slist_it_.pointed_node();
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const siterator first_bucket_bbegin = buckets->end();
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if(first_bucket_bbegin.pointed_node() <= n && n <= buckets[buckets_len-1].cend().pointed_node()){
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//If one-past the node is inside the bucket then look for the next non-empty bucket
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//1. get the bucket_impl from the iterator
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const bucket_type &b = static_cast<const bucket_type&>
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(bucket_type::slist_type::container_from_end_iterator(slist_it_));
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//2. Now just calculate the index b has in the bucket array
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size_type n_bucket = static_cast<size_type>(&b - buckets);
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//3. Iterate until a non-empty bucket is found
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do{
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if (++n_bucket >= buckets_len){ //bucket overflow, return end() iterator
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slist_it_ = buckets->before_begin();
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return;
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}
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}
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while (buckets[n_bucket].empty());
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slist_it_ = buckets[n_bucket].begin();
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}
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else{
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//++slist_it_ yield to a valid object
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}
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}
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siterator slist_it_;
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const_bucketvaltraits_ptr traitsptr_;
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};
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} //namespace intrusive {
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} //namespace boost {
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#endif
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