comparison DEPENDENCIES/generic/include/boost/intrusive/hashtable.hpp @ 16:2665513ce2d3

Add boost headers

+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga  2006-2013
+//
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+#ifndef BOOST_INTRUSIVE_HASHTABLE_HPP
+#define BOOST_INTRUSIVE_HASHTABLE_HPP
+
+#include <boost/intrusive/detail/config_begin.hpp>
+//std C++
+#include <functional>   //std::equal_to
+#include <utility>      //std::pair
+#include <algorithm>    //std::swap, std::lower_bound, std::upper_bound
+#include <cstddef>      //std::size_t
+//boost
+#include <boost/intrusive/detail/assert.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/functional/hash.hpp>
+#include <boost/pointer_cast.hpp>
+//General intrusive utilities
+#include <boost/intrusive/intrusive_fwd.hpp>
+#include <boost/intrusive/detail/hashtable_node.hpp>
+#include <boost/intrusive/detail/transform_iterator.hpp>
+#include <boost/intrusive/link_mode.hpp>
+#include <boost/intrusive/detail/ebo_functor_holder.hpp>
+#include <boost/intrusive/detail/clear_on_destructor_base.hpp>
+#include <boost/intrusive/detail/utilities.hpp>
+//Implementation utilities
+#include <boost/intrusive/unordered_set_hook.hpp>
+#include <boost/intrusive/slist.hpp>
+#include <boost/intrusive/pointer_traits.hpp>
+#include <boost/intrusive/detail/mpl.hpp>
+#include <boost/move/move.hpp>
+
+namespace boost {
+namespace intrusive {
+
+/// @cond
+
+struct hash_bool_flags
+{
+   static const std::size_t unique_keys_pos        = 1u;
+   static const std::size_t constant_time_size_pos = 2u;
+   static const std::size_t power_2_buckets_pos    = 4u;
+   static const std::size_t cache_begin_pos        = 8u;
+   static const std::size_t compare_hash_pos       = 16u;
+   static const std::size_t incremental_pos        = 32u;
+};
+
+namespace detail {
+
+template<class SupposedValueTraits>
+struct get_slist_impl_from_supposed_value_traits
+{
+   typedef typename detail::get_real_value_traits
+      <SupposedValueTraits>::type               real_value_traits;
+   typedef typename detail::get_node_traits
+      <real_value_traits>::type                 node_traits;
+   typedef typename get_slist_impl
+      <typename reduced_slist_node_traits
+         <node_traits>::type
+      >::type                                   type;
+};
+
+template<class SupposedValueTraits>
+struct unordered_bucket_impl
+{
+   typedef typename
+      get_slist_impl_from_supposed_value_traits
+         <SupposedValueTraits>::type            slist_impl;
+   typedef detail::bucket_impl<slist_impl>      implementation_defined;
+   typedef implementation_defined               type;
+};
+
+template<class SupposedValueTraits>
+struct unordered_bucket_ptr_impl
+{
+   typedef typename detail::get_node_traits
+      <SupposedValueTraits>::type::node_ptr     node_ptr;
+   typedef typename unordered_bucket_impl
+      <SupposedValueTraits>::type               bucket_type;
+
+   typedef typename pointer_traits
+      <node_ptr>::template rebind_pointer
+         < bucket_type >::type                  implementation_defined;
+   typedef implementation_defined               type;
+};
+
+template <class T>
+struct store_hash_bool
+{
+   template<bool Add>
+   struct two_or_three {one _[2 + Add];};
+   template <class U> static one test(...);
+   template <class U> static two_or_three<U::store_hash> test (int);
+   static const std::size_t value = sizeof(test<T>(0));
+};
+
+template <class T>
+struct store_hash_is_true
+{
+   static const bool value = store_hash_bool<T>::value > sizeof(one)*2;
+};
+
+template <class T>
+struct optimize_multikey_bool
+{
+   template<bool Add>
+   struct two_or_three {one _[2 + Add];};
+   template <class U> static one test(...);
+   template <class U> static two_or_three<U::optimize_multikey> test (int);
+   static const std::size_t value = sizeof(test<T>(0));
+};
+
+template <class T>
+struct optimize_multikey_is_true
+{
+   static const bool value = optimize_multikey_bool<T>::value > sizeof(one)*2;
+};
+
+struct insert_commit_data_impl
+{
+   std::size_t hash;
+};
+
+template<class Node, class SlistNodePtr>
+inline typename pointer_traits<SlistNodePtr>::template rebind_pointer<Node>::type
+   dcast_bucket_ptr(const SlistNodePtr &p)
+{
+   typedef typename pointer_traits<SlistNodePtr>::template rebind_pointer<Node>::type node_ptr;
+   return pointer_traits<node_ptr>::pointer_to(static_cast<Node&>(*p));
+}
+
+template<class NodeTraits>
+struct group_functions
+{
+   typedef NodeTraits                                             node_traits;
+   typedef unordered_group_adapter<node_traits>                   group_traits;
+   typedef typename node_traits::node_ptr                         node_ptr;
+   typedef typename node_traits::node                             node;
+   typedef typename reduced_slist_node_traits
+      <node_traits>::type                                         reduced_node_traits;
+   typedef typename reduced_node_traits::node_ptr                 slist_node_ptr;
+   typedef typename reduced_node_traits::node                     slist_node;
+   typedef circular_slist_algorithms<group_traits>                group_algorithms;
+
+   static slist_node_ptr get_bucket_before_begin
+      (const slist_node_ptr &bucket_beg, const slist_node_ptr &bucket_end, const node_ptr &p)
+   {
+      //First find the last node of p's group.
+      //This requires checking the first node of the next group or
+      //the bucket node.
+      node_ptr prev_node = p;
+      node_ptr nxt(node_traits::get_next(p));
+      while(!(bucket_beg <= nxt && nxt <= bucket_end) &&
+             (group_traits::get_next(nxt) == prev_node)){
+         prev_node = nxt;
+         nxt = node_traits::get_next(nxt);
+      }
+
+      //If we've reached the bucket node just return it.
+      if(bucket_beg <= nxt && nxt <= bucket_end){
+         return nxt;
+      }
+
+      //Otherwise, iterate using group links until the bucket node
+      node_ptr first_node_of_group  = nxt;
+      node_ptr last_node_group      = group_traits::get_next(first_node_of_group);
+      slist_node_ptr possible_end   = node_traits::get_next(last_node_group);
+
+      while(!(bucket_beg <= possible_end && possible_end <= bucket_end)){
+         first_node_of_group = detail::dcast_bucket_ptr<node>(possible_end);
+         last_node_group   = group_traits::get_next(first_node_of_group);
+         possible_end      = node_traits::get_next(last_node_group);
+      }
+      return possible_end;
+   }
+
+   static node_ptr get_prev_to_first_in_group(const slist_node_ptr &bucket_node, const node_ptr &first_in_group)
+   {
+      //Just iterate using group links and obtain the node
+      //before "first_in_group)"
+      node_ptr prev_node = detail::dcast_bucket_ptr<node>(bucket_node);
+      node_ptr nxt(node_traits::get_next(prev_node));
+      while(nxt != first_in_group){
+         prev_node = group_traits::get_next(nxt);
+         nxt = node_traits::get_next(prev_node);
+      }
+      return prev_node;
+   }
+
+   static node_ptr get_first_in_group_of_last_in_group(const node_ptr &last_in_group)
+   {
+      //Just iterate using group links and obtain the node
+      //before "last_in_group"
+      node_ptr possible_first = group_traits::get_next(last_in_group);
+      node_ptr possible_first_prev = group_traits::get_next(possible_first);
+      // The deleted node is at the end of the group, so the
+      // node in the group pointing to it is at the beginning
+      // of the group. Find that to change its pointer.
+      while(possible_first_prev != last_in_group){
+         possible_first = possible_first_prev;
+         possible_first_prev = group_traits::get_next(possible_first);
+      }
+      return possible_first;
+   }
+
+   static void erase_from_group(const slist_node_ptr &end_ptr, const node_ptr &to_erase_ptr, detail::true_)
+   {
+      node_ptr nxt_ptr(node_traits::get_next(to_erase_ptr));
+      node_ptr prev_in_group_ptr(group_traits::get_next(to_erase_ptr));
+      bool last_in_group = (end_ptr == nxt_ptr) ||
+         (group_traits::get_next(nxt_ptr) != to_erase_ptr);
+      bool is_first_in_group = node_traits::get_next(prev_in_group_ptr) != to_erase_ptr;
+
+      if(is_first_in_group && last_in_group){
+         group_algorithms::init(to_erase_ptr);
+      }
+      else if(is_first_in_group){
+         group_algorithms::unlink_after(nxt_ptr);
+      }
+      else if(last_in_group){
+         node_ptr first_in_group =
+            get_first_in_group_of_last_in_group(to_erase_ptr);
+         group_algorithms::unlink_after(first_in_group);
+      }
+      else{
+         group_algorithms::unlink_after(nxt_ptr);
+      }
+   }
+
+   static void erase_from_group(const slist_node_ptr&, const node_ptr&, detail::false_)
+   {}
+
+   static node_ptr get_last_in_group(const node_ptr &first_in_group, detail::true_)
+   {  return group_traits::get_next(first_in_group);  }
+
+   static node_ptr get_last_in_group(const node_ptr &n, detail::false_)
+   {  return n;  }
+
+   static void init_group(const node_ptr &n, true_)
+   {  group_algorithms::init(n); }
+
+   static void init_group(const node_ptr &, false_)
+   {}
+
+   static void insert_in_group(const node_ptr &first_in_group, const node_ptr &n, true_)
+   {
+      if(first_in_group){
+         if(group_algorithms::unique(first_in_group))
+            group_algorithms::link_after(first_in_group, n);
+         else{
+            group_algorithms::link_after(group_algorithms::node_traits::get_next(first_in_group), n);
+         }
+      }
+      else{
+         group_algorithms::init_header(n);
+      }
+   }
+
+   static slist_node_ptr get_previous_and_next_in_group
+      ( const slist_node_ptr &i, node_ptr &nxt_in_group
+      //If first_end_ptr == last_end_ptr, then first_end_ptr is the bucket of i
+      //Otherwise first_end_ptr is the first bucket and last_end_ptr the last one.
+      , const slist_node_ptr &first_end_ptr, const slist_node_ptr &last_end_ptr)
+   {
+      slist_node_ptr prev;
+      node_ptr elem(detail::dcast_bucket_ptr<node>(i));
+
+      //It's the last in group if the next_node is a bucket
+      slist_node_ptr nxt(node_traits::get_next(elem));
+      bool last_in_group = (first_end_ptr <= nxt && nxt <= last_end_ptr)/* ||
+                            (group_traits::get_next(nxt) != elem)*/;
+      //It's the first in group if group_previous's next_node is not
+      //itself, as group list does not link bucket
+      node_ptr prev_in_group(group_traits::get_next(elem));
+      bool first_in_group = node_traits::get_next(prev_in_group) != elem;
+
+      if(first_in_group){
+         node_ptr start_pos;
+         if(last_in_group){
+            start_pos = elem;
+            nxt_in_group = node_ptr();
+         }
+         else{
+            start_pos = prev_in_group;
+            nxt_in_group = node_traits::get_next(elem);
+         }
+         slist_node_ptr bucket_node;
+         if(first_end_ptr != last_end_ptr){
+            bucket_node = group_functions::get_bucket_before_begin
+                  (first_end_ptr, last_end_ptr, start_pos);
+         }
+         else{
+            bucket_node = first_end_ptr;
+         }
+         prev = group_functions::get_prev_to_first_in_group(bucket_node, elem);
+      }
+      else{
+         if(last_in_group){
+            nxt_in_group = group_functions::get_first_in_group_of_last_in_group(elem);
+         }
+         else{
+            nxt_in_group = node_traits::get_next(elem);
+         }
+         prev = group_traits::get_next(elem);
+      }
+      return prev;
+   }
+
+   static void insert_in_group(const node_ptr&, const node_ptr&, false_)
+   {}
+};
+
+template<class BucketType, class SplitTraits>
+class incremental_rehash_rollback
+{
+   private:
+   typedef BucketType   bucket_type;
+   typedef SplitTraits  split_traits;
+
+   incremental_rehash_rollback();
+   incremental_rehash_rollback & operator=(const incremental_rehash_rollback &);
+   incremental_rehash_rollback (const incremental_rehash_rollback &);
+
+   public:
+   incremental_rehash_rollback
+      (bucket_type &source_bucket, bucket_type &destiny_bucket, split_traits &split_traits)
+      :  source_bucket_(source_bucket),  destiny_bucket_(destiny_bucket)
+      ,  split_traits_(split_traits),  released_(false)
+   {}
+
+   void release()
+   {  released_ = true; }
+
+   ~incremental_rehash_rollback()
+   {
+      if(!released_){
+         //If an exception is thrown, just put all moved nodes back in the old bucket
+         //and move back the split mark.
+         destiny_bucket_.splice_after(destiny_bucket_.before_begin(), source_bucket_);
+         split_traits_.decrement();
+      }
+   }
+
+   private:
+   bucket_type &source_bucket_;
+   bucket_type &destiny_bucket_;
+   split_traits &split_traits_;
+   bool released_;
+};
+
+template<class NodeTraits>
+struct node_functions
+{
+   static void store_hash(typename NodeTraits::node_ptr p, std::size_t h, true_)
+   {  return NodeTraits::set_hash(p, h); }
+
+   static void store_hash(typename NodeTraits::node_ptr, std::size_t, false_)
+   {}
+};
+
+inline std::size_t hash_to_bucket(std::size_t hash_value, std::size_t bucket_cnt, detail::false_)
+{  return hash_value % bucket_cnt;  }
+
+inline std::size_t hash_to_bucket(std::size_t hash_value, std::size_t bucket_cnt, detail::true_)
+{  return hash_value & (bucket_cnt - 1);   }
+
+template<bool Power2Buckets, bool Incremental>
+inline std::size_t hash_to_bucket_split(std::size_t hash_value, std::size_t bucket_cnt, std::size_t split)
+{
+   std::size_t bucket_number = detail::hash_to_bucket(hash_value, bucket_cnt, detail::bool_<Power2Buckets>());
+   if(Incremental)
+      if(bucket_number >= split)
+         bucket_number -= bucket_cnt/2;
+   return bucket_number;
+}
+
+}  //namespace detail {
+
+//!This metafunction will obtain the type of a bucket
+//!from the value_traits or hook option to be used with
+//!a hash container.
+template<class ValueTraitsOrHookOption>
+struct unordered_bucket
+   : public detail::unordered_bucket_impl
+      <typename ValueTraitsOrHookOption::
+         template pack<none>::proto_value_traits
+      >
+{};
+
+//!This metafunction will obtain the type of a bucket pointer
+//!from the value_traits or hook option to be used with
+//!a hash container.
+template<class ValueTraitsOrHookOption>
+struct unordered_bucket_ptr
+   :  public detail::unordered_bucket_ptr_impl
+         <typename ValueTraitsOrHookOption::
+          template pack<none>::proto_value_traits
+         >
+{};
+
+//!This metafunction will obtain the type of the default bucket traits
+//!(when the user does not specify the bucket_traits<> option) from the
+//!value_traits or hook option to be used with
+//!a hash container.
+template<class ValueTraitsOrHookOption>
+struct unordered_default_bucket_traits
+{
+   typedef typename ValueTraitsOrHookOption::
+      template pack<none>::proto_value_traits   supposed_value_traits;
+   typedef typename detail::
+      get_slist_impl_from_supposed_value_traits
+         <supposed_value_traits>::type          slist_impl;
+   typedef detail::bucket_traits_impl
+      <slist_impl>                              implementation_defined;
+   typedef implementation_defined               type;
+};
+
+struct default_bucket_traits;
+
+struct hashtable_defaults
+{
+   typedef detail::default_hashtable_hook   proto_value_traits;
+   typedef std::size_t                 size_type;
+   typedef void                        equal;
+   typedef void                        hash;
+   typedef default_bucket_traits       bucket_traits;
+   static const bool constant_time_size   = true;
+   static const bool power_2_buckets      = false;
+   static const bool cache_begin          = false;
+   static const bool compare_hash         = false;
+   static const bool incremental          = false;
+};
+
+template<class RealValueTraits, bool IsConst>
+struct downcast_node_to_value_t
+   :  public detail::node_to_value<RealValueTraits, IsConst>
+{
+   typedef detail::node_to_value<RealValueTraits, IsConst>  base_t;
+   typedef typename base_t::result_type                     result_type;
+   typedef RealValueTraits                                  real_value_traits;
+   typedef typename detail::get_slist_impl
+      <typename detail::reduced_slist_node_traits
+         <typename real_value_traits::node_traits>::type
+      >::type                                               slist_impl;
+   typedef typename detail::add_const_if_c
+         <typename slist_impl::node, IsConst>::type      &  first_argument_type;
+   typedef typename detail::add_const_if_c
+         < typename RealValueTraits::node_traits::node
+         , IsConst>::type                                &  intermediate_argument_type;
+   typedef typename pointer_traits
+      <typename RealValueTraits::pointer>::
+         template rebind_pointer
+            <const RealValueTraits>::type                   const_real_value_traits_ptr;
+
+   downcast_node_to_value_t(const const_real_value_traits_ptr &ptr)
+      :  base_t(ptr)
+   {}
+
+   result_type operator()(first_argument_type arg) const
+   {  return this->base_t::operator()(static_cast<intermediate_argument_type>(arg)); }
+};
+
+template<class F, class SlistNodePtr, class NodePtr>
+struct node_cast_adaptor
+   :  private detail::ebo_functor_holder<F>
+{
+   typedef detail::ebo_functor_holder<F> base_t;
+
+   typedef typename pointer_traits<SlistNodePtr>::element_type slist_node;
+   typedef typename pointer_traits<NodePtr>::element_type      node;
+
+   template<class ConvertibleToF, class RealValuTraits>
+   node_cast_adaptor(const ConvertibleToF &c2f, const RealValuTraits *traits)
+      :  base_t(base_t(c2f, traits))
+   {}
+
+   typename base_t::node_ptr operator()(const slist_node &to_clone)
+   {  return base_t::operator()(static_cast<const node &>(to_clone));   }
+
+   void operator()(SlistNodePtr to_clone)
+   {
+      base_t::operator()(pointer_traits<NodePtr>::pointer_to(static_cast<node &>(*to_clone)));
+   }
+};
+
+static const std::size_t hashtable_data_bool_flags_mask  =
+   ( hash_bool_flags::cache_begin_pos
+   | hash_bool_flags::constant_time_size_pos
+   | hash_bool_flags::incremental_pos
+   );
+
+template<class ValueTraits, class BucketTraits>
+struct bucket_plus_vtraits : public ValueTraits
+{
+   typedef BucketTraits bucket_traits;
+   typedef ValueTraits  value_traits;
+
+   static const bool external_value_traits  =
+      detail::external_value_traits_bool_is_true<ValueTraits>::value;
+
+   static const bool external_bucket_traits =
+      detail::external_bucket_traits_bool_is_true<bucket_traits>::value;
+
+   typedef typename detail::get_real_value_traits<ValueTraits>::type    real_value_traits;
+
+   static const bool safemode_or_autounlink = is_safe_autounlink<real_value_traits::link_mode>::value;
+
+   typedef typename detail::eval_if_c
+      < external_bucket_traits
+      , detail::eval_bucket_traits<bucket_traits>
+      , detail::identity<bucket_traits>
+      >::type                                                        real_bucket_traits;
+   typedef typename
+      detail::get_slist_impl_from_supposed_value_traits
+         <real_value_traits>::type                                   slist_impl;
+
+   template<class BucketTraitsType>
+   bucket_plus_vtraits(const ValueTraits &val_traits, BOOST_FWD_REF(BucketTraitsType) b_traits)
+      :  ValueTraits(val_traits), bucket_traits_(::boost::forward<BucketTraitsType>(b_traits))
+   {}
+
+   bucket_plus_vtraits & operator =(const bucket_plus_vtraits &x)
+   {
+      bucket_traits_ = x.bucket_traits_;
+      return *this;
+   }
+
+   //real_value_traits
+   //
+   const real_value_traits &priv_real_value_traits(detail::false_) const
+   {  return *this;  }
+
+   const real_value_traits &priv_real_value_traits(detail::true_) const
+   {  return this->get_value_traits(*this);  }
+
+   real_value_traits &priv_real_value_traits(detail::false_)
+   {  return *this;  }
+
+   real_value_traits &priv_real_value_traits(detail::true_)
+   {  return this->get_value_traits(*this);  }
+
+   const real_value_traits &priv_real_value_traits() const
+   {  return this->priv_real_value_traits(detail::bool_<external_value_traits>());  }
+
+   real_value_traits &priv_real_value_traits()
+   {  return this->priv_real_value_traits(detail::bool_<external_value_traits>());  }
+
+   typedef typename pointer_traits<typename real_value_traits::pointer>::
+      template rebind_pointer<const real_value_traits>::type const_real_value_traits_ptr;
+
+   const_real_value_traits_ptr real_value_traits_ptr() const
+   {  return pointer_traits<const_real_value_traits_ptr>::pointer_to(this->priv_real_value_traits());  }
+
+   //real_bucket_traits
+   //
+   const real_bucket_traits &priv_real_bucket_traits(detail::false_) const
+   {  return this->bucket_traits_;  }
+
+   const real_bucket_traits &priv_real_bucket_traits(detail::true_) const
+   {  return this->bucket_traits_.get_bucket_traits(*this);  }
+
+   real_bucket_traits &priv_real_bucket_traits(detail::false_)
+   {  return bucket_traits_;  }
+
+   real_bucket_traits &priv_real_bucket_traits(detail::true_)
+   {  return this->get_bucket_traits(*this);  }
+
+   const real_bucket_traits &priv_real_bucket_traits() const
+   {  return this->priv_real_bucket_traits(detail::bool_<external_bucket_traits>());  }
+
+   real_bucket_traits &priv_real_bucket_traits()
+   {  return this->priv_real_bucket_traits(detail::bool_<external_bucket_traits>());  }
+
+   //bucket_value_traits
+   //
+   const bucket_plus_vtraits &get_bucket_value_traits() const
+   {  return *this;  }
+
+   bucket_plus_vtraits &get_bucket_value_traits()
+   {  return *this;  }
+
+   typedef typename pointer_traits<typename real_value_traits::pointer>::
+      template rebind_pointer<const bucket_plus_vtraits>::type const_bucket_value_traits_ptr;
+
+   const_bucket_value_traits_ptr bucket_value_traits_ptr() const
+   {  return pointer_traits<const_bucket_value_traits_ptr>::pointer_to(this->get_bucket_value_traits());  }
+
+   //value traits
+   //
+   const value_traits &priv_value_traits() const
+   {  return *this;  }
+
+   value_traits &priv_value_traits()
+   {  return *this;  }
+
+   //bucket_traits
+   //
+   const bucket_traits &priv_bucket_traits() const
+   {  return this->bucket_traits_;  }
+
+   bucket_traits &priv_bucket_traits()
+   {  return this->bucket_traits_;  }
+
+   //operations
+   typedef typename detail::unordered_bucket_ptr_impl<real_value_traits>::type bucket_ptr;
+
+   bucket_ptr priv_bucket_pointer() const
+   {  return this->priv_real_bucket_traits().bucket_begin();  }
+
+   typename slist_impl::size_type priv_bucket_count() const
+   {  return this->priv_real_bucket_traits().bucket_count();  }
+
+   bucket_ptr priv_invalid_bucket() const
+   {
+      const real_bucket_traits &rbt = this->priv_real_bucket_traits();
+      return rbt.bucket_begin() + rbt.bucket_count();
+   }
+
+   typedef typename real_value_traits::node_traits    node_traits;
+   typedef unordered_group_adapter<node_traits>       group_traits;
+   typedef typename slist_impl::iterator              siterator;
+   typedef typename slist_impl::size_type             size_type;
+   typedef detail::bucket_impl<slist_impl>            bucket_type;
+   typedef detail::group_functions<node_traits>       group_functions_t;
+   typedef typename slist_impl::node_algorithms       node_algorithms;
+   typedef typename slist_impl::node_ptr              slist_node_ptr;
+   typedef typename node_traits::node_ptr             node_ptr;
+   typedef typename node_traits::node                 node;
+   typedef typename real_value_traits::value_type     value_type;
+   typedef circular_slist_algorithms<group_traits>    group_algorithms;
+
+
+/*
+   siterator priv_invalid_local_it() const
+   {  return this->priv_invalid_bucket()->end();  }
+*/
+   siterator priv_invalid_local_it() const
+   {
+      return this->priv_real_bucket_traits().bucket_begin()->before_begin();
+   }
+
+   ///
+   static siterator priv_get_last(bucket_type &b, detail::true_)  //optimize multikey
+   {
+      //First find the last node of p's group.
+      //This requires checking the first node of the next group or
+      //the bucket node.
+      slist_node_ptr end_ptr(b.end().pointed_node());
+      node_ptr possible_end(node_traits::get_next( detail::dcast_bucket_ptr<node>(end_ptr)));
+      node_ptr last_node_group(possible_end);
+
+      while(end_ptr != possible_end){
+         last_node_group   = group_traits::get_next(detail::dcast_bucket_ptr<node>(possible_end));
+         possible_end      = node_traits::get_next(last_node_group);
+      }
+      return bucket_type::s_iterator_to(*last_node_group);
+   }
+
+   static siterator priv_get_last(bucket_type &b, detail::false_) //NOT optimize multikey
+   {  return b.previous(b.end());   }
+
+   static siterator priv_get_previous(bucket_type &b, siterator i, detail::true_)   //optimize multikey
+   {
+      node_ptr elem(detail::dcast_bucket_ptr<node>(i.pointed_node()));
+      node_ptr prev_in_group(group_traits::get_next(elem));
+      bool first_in_group = node_traits::get_next(prev_in_group) != elem;
+      typename bucket_type::node &n = first_in_group
+         ? *group_functions_t::get_prev_to_first_in_group(b.end().pointed_node(), elem)
+         : *group_traits::get_next(elem)
+         ;
+      return bucket_type::s_iterator_to(n);
+   }
+
+   static siterator priv_get_previous(bucket_type &b, siterator i, detail::false_)   //NOT optimize multikey
+   {  return b.previous(i);   }
+
+   static void priv_clear_group_nodes(bucket_type &b, detail::true_) //optimize multikey
+   {
+      siterator it(b.begin()), itend(b.end());
+      while(it != itend){
+         node_ptr to_erase(detail::dcast_bucket_ptr<node>(it.pointed_node()));
+         ++it;
+         group_algorithms::init(to_erase);
+      }
+   }
+
+   static void priv_clear_group_nodes(bucket_type &, detail::false_) //NOT optimize multikey
+   {}
+
+   std::size_t priv_get_bucket_num_no_hash_store(siterator it, detail::true_)    //optimize multikey
+   {
+      const bucket_ptr f(this->priv_bucket_pointer()), l(f + this->priv_bucket_count() - 1);
+      slist_node_ptr bb = group_functions_t::get_bucket_before_begin
+         ( f->end().pointed_node()
+         , l->end().pointed_node()
+         , detail::dcast_bucket_ptr<node>(it.pointed_node()));
+      //Now get the bucket_impl from the iterator
+      const bucket_type &b = static_cast<const bucket_type&>
+         (bucket_type::slist_type::container_from_end_iterator(bucket_type::s_iterator_to(*bb)));
+      //Now just calculate the index b has in the bucket array
+      return static_cast<size_type>(&b - &*f);
+   }
+
+   std::size_t priv_get_bucket_num_no_hash_store(siterator it, detail::false_)   //NO optimize multikey
+   {
+      bucket_ptr f(this->priv_bucket_pointer()), l(f + this->priv_bucket_count() - 1);
+      slist_node_ptr first_ptr(f->cend().pointed_node())
+                   , last_ptr(l->cend().pointed_node());
+
+      //The end node is embedded in the singly linked list:
+      //iterate until we reach it.
+      while(!(first_ptr <= it.pointed_node() && it.pointed_node() <= last_ptr)){
+         ++it;
+      }
+      //Now get the bucket_impl from the iterator
+      const bucket_type &b = static_cast<const bucket_type&>
+         (bucket_type::container_from_end_iterator(it));
+
+      //Now just calculate the index b has in the bucket array
+      return static_cast<std::size_t>(&b - &*f);
+   }
+
+   static std::size_t priv_stored_hash(slist_node_ptr n, detail::true_) //store_hash
+   {  return node_traits::get_hash(detail::dcast_bucket_ptr<node>(n));  }
+
+   static std::size_t priv_stored_hash(slist_node_ptr, detail::false_)  //NO store_hash
+   {
+      //This code should never be reached!
+      BOOST_INTRUSIVE_INVARIANT_ASSERT(0);
+      return 0;
+   }
+
+   node &priv_value_to_node(value_type &v)
+   {  return *this->priv_real_value_traits().to_node_ptr(v);  }
+
+   const node &priv_value_to_node(const value_type &v) const
+   {  return *this->priv_real_value_traits().to_node_ptr(v);  }
+
+   value_type &priv_value_from_slist_node(slist_node_ptr n)
+   {  return *this->priv_real_value_traits().to_value_ptr(detail::dcast_bucket_ptr<node>(n)); }
+
+   const value_type &priv_value_from_slist_node(slist_node_ptr n) const
+   {  return *this->priv_real_value_traits().to_value_ptr(detail::dcast_bucket_ptr<node>(n)); }
+
+   bucket_traits bucket_traits_;
+};
+
+template<class VoidOrKeyHash, class ValueTraits, class BucketTraits>
+struct bucket_hash_t
+   : public detail::ebo_functor_holder
+   <typename get_hash< VoidOrKeyHash
+                      , typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits::value_type
+                      >::type
+   >
+   , bucket_plus_vtraits<ValueTraits, BucketTraits>
+{
+   typedef typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits   real_value_traits;
+   typedef typename real_value_traits::value_type                                      value_type;
+   typedef typename real_value_traits::node_traits                                     node_traits;
+   typedef typename get_hash< VoidOrKeyHash, value_type>::type                         hasher;
+   typedef BucketTraits bucket_traits;
+   typedef bucket_plus_vtraits<ValueTraits, BucketTraits> bucket_plus_vtraits_t;
+
+   template<class BucketTraitsType>
+   bucket_hash_t(const ValueTraits &val_traits, BOOST_FWD_REF(BucketTraitsType) b_traits, const hasher & h)
+      :  detail::ebo_functor_holder<hasher>(h), bucket_plus_vtraits_t(val_traits, ::boost::forward<BucketTraitsType>(b_traits))
+   {}
+
+   const hasher &priv_hasher() const
+   {  return this->detail::ebo_functor_holder<hasher>::get();  }
+
+   hasher &priv_hasher()
+   {  return this->detail::ebo_functor_holder<hasher>::get();  }
+
+   std::size_t priv_stored_or_compute_hash(const value_type &v, detail::true_) const   //For store_hash == true
+   {  return node_traits::get_hash(this->priv_real_value_traits().to_node_ptr(v));  }
+
+   std::size_t priv_stored_or_compute_hash(const value_type &v, detail::false_) const  //For store_hash == false
+   {  return this->priv_hasher()(v);   }
+};
+
+template<class VoidOrKeyHash, class VoidOrKeyEqual, class ValueTraits, class BucketTraits, bool>
+struct bucket_hash_equal_t
+   : public detail::ebo_functor_holder //equal
+   <typename get_equal_to< VoidOrKeyEqual
+                         , typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits::value_type
+                         >::type
+   >
+   , bucket_hash_t<VoidOrKeyHash, ValueTraits, BucketTraits>
+{
+   typedef bucket_hash_t<VoidOrKeyHash, ValueTraits, BucketTraits> bucket_hash_type;
+   typedef typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits   real_value_traits;
+   typedef typename get_equal_to< VoidOrKeyEqual
+                                , typename real_value_traits::value_type
+                                >::type         value_equal;
+   typedef typename bucket_hash_type::hasher    hasher;
+   typedef BucketTraits                         bucket_traits;
+   typedef bucket_hash_t<VoidOrKeyHash, ValueTraits, BucketTraits> buckethash_t;
+   typedef typename bucket_hash_type::real_bucket_traits real_bucket_traits;
+   typedef typename bucket_hash_type::slist_impl         slist_impl;
+   typedef typename slist_impl::size_type                size_type;
+   typedef typename slist_impl::iterator                 siterator;
+   typedef detail::bucket_impl<slist_impl>               bucket_type;
+   typedef typename detail::unordered_bucket_ptr_impl<real_value_traits>::type bucket_ptr;
+
+   template<class BucketTraitsType>
+   bucket_hash_equal_t(const ValueTraits &val_traits, BOOST_FWD_REF(BucketTraitsType) b_traits, const hasher & h, const value_equal &e)
+      : detail::ebo_functor_holder<value_equal>(e)
+      , buckethash_t(val_traits, ::boost::forward<BucketTraitsType>(b_traits), h)
+   {}
+
+   bucket_ptr priv_get_cache()
+   {  return this->priv_bucket_pointer();   }
+
+   void priv_set_cache(const bucket_ptr &)
+   {}
+
+   size_type priv_get_cache_bucket_num()
+   {  return 0u;  }
+
+   void priv_initialize_cache()
+   {}
+
+   void priv_swap_cache(bucket_hash_equal_t &)
+   {}
+
+   siterator priv_begin() const
+   {
+      size_type n = 0;
+      size_type bucket_cnt = this->priv_bucket_count();
+      for (n = 0; n < bucket_cnt; ++n){
+         bucket_type &b = this->priv_bucket_pointer()[n];
+         if(!b.empty()){
+            return b.begin();
+         }
+      }
+      return this->priv_invalid_local_it();
+   }
+
+   void priv_insertion_update_cache(size_type)
+   {}
+
+   void priv_erasure_update_cache_range(size_type, size_type)
+   {}
+
+   void priv_erasure_update_cache()
+   {}
+
+   const value_equal &priv_equal() const
+   {  return this->detail::ebo_functor_holder<value_equal>::get();  }
+
+   value_equal &priv_equal()
+   {  return this->detail::ebo_functor_holder<value_equal>::get();  }
+};
+
+template<class VoidOrKeyHash, class VoidOrKeyEqual, class ValueTraits, class BucketTraits>  //cache_begin == true version
+struct bucket_hash_equal_t<VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits, true>
+   : public detail::ebo_functor_holder //equal
+   <typename get_equal_to< VoidOrKeyEqual
+                         , typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits::value_type
+                         >::type
+   >
+   , public bucket_hash_t<VoidOrKeyHash, ValueTraits, BucketTraits>
+{
+   typedef bucket_hash_t<VoidOrKeyHash, ValueTraits, BucketTraits> bucket_hash_type;
+   typedef typename get_equal_to< VoidOrKeyEqual
+                                , typename bucket_plus_vtraits<ValueTraits,BucketTraits>::real_value_traits::value_type
+                                >::type                     value_equal;
+   typedef typename bucket_hash_type::hasher                hasher;
+   typedef BucketTraits                                     bucket_traits;
+   typedef typename bucket_hash_type::slist_impl::size_type size_type;
+   typedef typename bucket_hash_type::slist_impl::iterator  siterator;
+
+   template<class BucketTraitsType>
+   bucket_hash_equal_t(const ValueTraits &val_traits, BOOST_FWD_REF(BucketTraitsType) b_traits, const hasher & h, const value_equal &e)
+      : detail::ebo_functor_holder<value_equal>(e)
+      , bucket_hash_type(val_traits, ::boost::forward<BucketTraitsType>(b_traits), h)
+   {}
+
+   typedef typename detail::unordered_bucket_ptr_impl
+      <typename bucket_hash_type::real_value_traits>::type bucket_ptr;
+
+   bucket_ptr &priv_get_cache()
+   {  return cached_begin_;   }
+
+   const bucket_ptr &priv_get_cache() const
+   {  return cached_begin_;   }
+
+   void priv_set_cache(const bucket_ptr &p)
+   {  cached_begin_ = p;   }
+
+   std::size_t priv_get_cache_bucket_num()
+   {  return this->cached_begin_ - this->priv_bucket_pointer();  }
+
+   void priv_initialize_cache()
+   {  this->cached_begin_ = this->priv_invalid_bucket();  }
+
+   void priv_swap_cache(bucket_hash_equal_t &other)
+   {
+      std::swap(this->cached_begin_, other.cached_begin_);
+   }
+
+   siterator priv_begin() const
+   {
+      if(this->cached_begin_ == this->priv_invalid_bucket()){
+         return this->priv_invalid_local_it();
+      }
+      else{
+         return this->cached_begin_->begin();
+      }
+   }
+
+   void priv_insertion_update_cache(size_type insertion_bucket)
+   {
+      bucket_ptr p = this->priv_bucket_pointer() + insertion_bucket;
+      if(p < this->cached_begin_){
+         this->cached_begin_ = p;
+      }
+   }
+
+   const value_equal &priv_equal() const
+   {  return this->detail::ebo_functor_holder<value_equal>::get();  }
+
+   value_equal &priv_equal()
+   {  return this->detail::ebo_functor_holder<value_equal>::get();  }
+
+   void priv_erasure_update_cache_range(size_type first_bucket_num, size_type last_bucket_num)
+   {
+      //If the last bucket is the end, the cache must be updated
+      //to the last position if all
+      if(this->priv_get_cache_bucket_num() == first_bucket_num   &&
+         this->priv_bucket_pointer()[first_bucket_num].empty()          ){
+         this->priv_set_cache(this->priv_bucket_pointer() + last_bucket_num);
+         this->priv_erasure_update_cache();
+      }
+   }
+
+   void priv_erasure_update_cache()
+   {
+      if(this->cached_begin_ != this->priv_invalid_bucket()){
+         size_type current_n = this->priv_get_cache() - this->priv_bucket_pointer();
+         for( const size_type num_buckets = this->priv_bucket_count()
+            ; current_n < num_buckets
+            ; ++current_n, ++this->priv_get_cache()){
+            if(!this->priv_get_cache()->empty()){
+               return;
+            }
+         }
+         this->priv_initialize_cache();
+      }
+   }
+
+   private:
+   bucket_ptr cached_begin_;
+};
+
+template<class SizeType, std::size_t BoolFlags, class VoidOrKeyHash, class VoidOrKeyEqual, class ValueTraits, class BucketTraits>
+struct hashdata_internal
+   : public detail::size_holder< 0 != (BoolFlags & hash_bool_flags::incremental_pos), SizeType, int>   //split_traits
+   , public bucket_hash_equal_t
+      < VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits
+      , 0 != (BoolFlags & hash_bool_flags::cache_begin_pos)
+      >
+{
+   typedef bucket_hash_equal_t
+      < VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits
+      , 0 != (BoolFlags & hash_bool_flags::cache_begin_pos)
+      > bucket_hash_equal_type;
+
+   typedef typename bucket_hash_equal_type::value_equal  value_equal;
+   typedef typename bucket_hash_equal_type::hasher       hasher;
+   typedef bucket_plus_vtraits<ValueTraits,BucketTraits> bucket_plus_vtraits_t;
+   typedef typename bucket_plus_vtraits_t::size_type     size_type;
+   typedef typename bucket_plus_vtraits_t::bucket_ptr    bucket_ptr;
+   static const bool optimize_multikey
+      = detail::optimize_multikey_is_true<typename bucket_plus_vtraits_t::real_value_traits::node_traits>::value;
+
+   typedef detail::bool_<optimize_multikey>                          optimize_multikey_t;
+
+   template<class BucketTraitsType>
+   hashdata_internal(const ValueTraits &val_traits, BOOST_FWD_REF(BucketTraitsType) b_traits, const hasher & h, const value_equal &e)
+      :  bucket_hash_equal_type(val_traits, ::boost::forward<BucketTraitsType>(b_traits), h, e)
+   {}
+
+   typedef detail::size_holder
+      <0 != (BoolFlags & hash_bool_flags::incremental_pos), SizeType, int>   split_traits;
+
+   split_traits &priv_split_traits()
+   {  return *this;  }
+
+   const split_traits &priv_split_traits() const
+   {  return *this;  }
+};
+
+template<class SizeType, std::size_t BoolFlags, class VoidOrKeyHash, class VoidOrKeyEqual, class ValueTraits, class BucketTraits>
+struct hashtable_data_t
+   : public detail::size_holder< 0 != (BoolFlags & hash_bool_flags::constant_time_size_pos), SizeType>   //size_traits
+   , public hashdata_internal
+      < SizeType, BoolFlags & (hash_bool_flags::incremental_pos | hash_bool_flags::cache_begin_pos)
+      , VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits>
+{
+   static const std::size_t bool_flags = BoolFlags;
+   typedef detail::size_holder
+      < 0 != (BoolFlags & hash_bool_flags::constant_time_size_pos)
+      , SizeType>       size_traits;
+
+   typedef hashdata_internal
+      < SizeType, BoolFlags & (hash_bool_flags::incremental_pos | hash_bool_flags::cache_begin_pos)
+      , VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits> internal_type;
+
+   typedef ValueTraits                                value_traits;
+   typedef typename internal_type::value_equal        value_equal;
+   typedef typename internal_type::hasher             hasher;
+   typedef BucketTraits                               bucket_traits;
+   typedef bucket_plus_vtraits
+      <ValueTraits,BucketTraits>                      bucket_plus_vtraits_t;
+
+   static const bool external_value_traits  =
+      detail::external_value_traits_bool_is_true<ValueTraits>::value;
+   static const bool external_bucket_traits = bucket_plus_vtraits_t::external_bucket_traits;
+
+   typedef typename bucket_plus_vtraits_t::real_value_traits   real_value_traits;
+   typedef typename bucket_plus_vtraits_t::real_bucket_traits  real_bucket_traits;
+
+   size_traits &priv_size_traits()
+   {  return *this;  }
+
+   const size_traits &priv_size_traits() const
+   {  return *this;  }
+
+   template<class BucketTraitsType>
+   hashtable_data_t( BOOST_FWD_REF(BucketTraitsType) b_traits, const hasher & h
+                   , const value_equal &e, const value_traits &val_traits)
+      : size_traits()
+      , internal_type(val_traits, ::boost::forward<BucketTraitsType>(b_traits), h, e)
+   {}
+};
+
+/// @endcond
+
+//! The class template hashtable is an intrusive hash table container, that
+//! is used to construct intrusive unordered_set and unordered_multiset containers. The
+//! no-throw guarantee holds only, if the VoidOrKeyEqual object and Hasher don't throw.
+//!
+//! hashtable is a semi-intrusive container: each object to be stored in the
+//! container must contain a proper hook, but the container also needs
+//! additional auxiliary memory to work: hashtable needs a pointer to an array
+//! of type `bucket_type` to be passed in the constructor. This bucket array must
+//! have at least the same lifetime as the container. This makes the use of
+//! hashtable more complicated than purely intrusive containers.
+//! `bucket_type` is default-constructible, copyable and assignable
+//!
+//! The template parameter \c T is the type to be managed by the container.
+//! The user can specify additional options and if no options are provided
+//! default options are used.
+//!
+//! The container supports the following options:
+//! \c base_hook<>/member_hook<>/value_traits<>,
+//! \c constant_time_size<>, \c size_type<>, \c hash<> and \c equal<>
+//! \c bucket_traits<>, power_2_buckets<>, cache_begin<> and incremental<>.
+//!
+//! hashtable only provides forward iterators but it provides 4 iterator types:
+//! iterator and const_iterator to navigate through the whole container and
+//! local_iterator and const_local_iterator to navigate through the values
+//! stored in a single bucket. Local iterators are faster and smaller.
+//!
+//! It's not recommended to use non constant-time size hashtables because several
+//! key functions, like "empty()", become non-constant time functions. Non
+//! constant_time size hashtables are mainly provided to support auto-unlink hooks.
+//!
+//! hashtables, does not make automatic rehashings nor
+//! offers functions related to a load factor. Rehashing can be explicitly requested
+//! and the user must provide a new bucket array that will be used from that moment.
+//!
+//! Since no automatic rehashing is done, iterators are never invalidated when
+//! inserting or erasing elements. Iterators are only invalidated when rehashing.
+#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
+template<class T, class ...Options>
+#else
+template<class ValueTraits, class VoidOrKeyHash, class VoidOrKeyEqual, class SizeType, class BucketTraits, std::size_t BoolFlags>
+#endif
+class hashtable_impl
+   : public hashtable_data_t
+      < SizeType
+      , BoolFlags & hashtable_data_bool_flags_mask
+      , VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits>
+   ,  private detail::clear_on_destructor_base
+         < hashtable_impl<ValueTraits, VoidOrKeyHash, VoidOrKeyEqual, SizeType, BucketTraits, BoolFlags>
+         , true   //To always clear the bucket array
+         //is_safe_autounlink<detail::get_real_value_traits<ValueTraits>::type::link_mode>::value
+         >
+{
+   template<class C, bool> friend class detail::clear_on_destructor_base;
+   public:
+   typedef ValueTraits  value_traits;
+
+   typedef hashtable_data_t
+      < SizeType
+      , BoolFlags & hashtable_data_bool_flags_mask
+      , VoidOrKeyHash, VoidOrKeyEqual, ValueTraits, BucketTraits>  data_type;
+
+   /// @cond
+   static const bool external_value_traits  = data_type::external_value_traits;
+   static const bool external_bucket_traits = data_type::external_bucket_traits;
+
+   typedef BucketTraits                                              bucket_traits;
+   typedef typename data_type::real_bucket_traits                    real_bucket_traits;
+   typedef typename data_type::real_value_traits                     real_value_traits;
+
+
+   typedef typename detail::get_slist_impl
+      <typename detail::reduced_slist_node_traits
+         <typename real_value_traits::node_traits>::type
+      >::type                                                           slist_impl;
+   typedef bucket_plus_vtraits<ValueTraits, BucketTraits>               bucket_plus_vtraits_t;
+   typedef typename bucket_plus_vtraits_t::const_real_value_traits_ptr  const_real_value_traits_ptr;
+
+
+   /// @endcond
+
+   typedef typename real_value_traits::pointer                       pointer;
+   typedef typename real_value_traits::const_pointer                 const_pointer;
+   typedef typename real_value_traits::value_type                    value_type;
+   typedef typename pointer_traits<pointer>::reference               reference;
+   typedef typename pointer_traits<const_pointer>::reference         const_reference;
+   typedef typename pointer_traits<pointer>::difference_type         difference_type;
+   typedef SizeType                                                  size_type;
+   typedef value_type                                                key_type;
+   typedef typename data_type::value_equal                           key_equal;
+   typedef typename data_type::hasher                                hasher;
+   typedef detail::bucket_impl<slist_impl>                           bucket_type;
+   typedef typename pointer_traits
+      <pointer>::template rebind_pointer
+         < bucket_type >::type                                       bucket_ptr;
+   typedef typename slist_impl::iterator                             siterator;
+   typedef typename slist_impl::const_iterator                       const_siterator;
+   typedef hashtable_iterator<bucket_plus_vtraits_t, false>          iterator;
+   typedef hashtable_iterator<bucket_plus_vtraits_t, true>           const_iterator;
+   typedef typename real_value_traits::node_traits                   node_traits;
+   typedef typename node_traits::node                                node;
+   typedef typename pointer_traits
+      <pointer>::template rebind_pointer
+         < node >::type                                              node_ptr;
+   typedef typename pointer_traits
+      <pointer>::template rebind_pointer
+         < const node >::type                                        const_node_ptr;
+   typedef typename slist_impl::node_algorithms                      node_algorithms;
+
+   static const bool stateful_value_traits = detail::is_stateful_value_traits<real_value_traits>::value;
+   static const bool store_hash = detail::store_hash_is_true<node_traits>::value;
+
+   static const bool unique_keys          = 0 != (BoolFlags & hash_bool_flags::unique_keys_pos);
+   static const bool constant_time_size   = 0 != (BoolFlags & hash_bool_flags::constant_time_size_pos);
+   static const bool cache_begin          = 0 != (BoolFlags & hash_bool_flags::cache_begin_pos);
+   static const bool compare_hash         = 0 != (BoolFlags & hash_bool_flags::compare_hash_pos);
+   static const bool incremental          = 0 != (BoolFlags & hash_bool_flags::incremental_pos);
+   static const bool power_2_buckets      = incremental || (0 != (BoolFlags & hash_bool_flags::power_2_buckets_pos));
+
+   static const bool optimize_multikey
+      = detail::optimize_multikey_is_true<node_traits>::value && !unique_keys;
+
+   /// @cond
+   private:
+
+   //Configuration error: compare_hash<> can't be specified without store_hash<>
+   //See documentation for more explanations
+   BOOST_STATIC_ASSERT((!compare_hash || store_hash));
+
+   typedef typename slist_impl::node_ptr                             slist_node_ptr;
+   typedef typename pointer_traits
+      <slist_node_ptr>::template rebind_pointer
+         < void >::type                                              void_pointer;
+   //We'll define group traits, but these won't be instantiated if
+   //optimize_multikey is not true
+   typedef unordered_group_adapter<node_traits>                      group_traits;
+   typedef circular_slist_algorithms<group_traits>                   group_algorithms;
+   typedef detail::bool_<store_hash>                                 store_hash_t;
+   typedef detail::bool_<optimize_multikey>                          optimize_multikey_t;
+   typedef detail::bool_<cache_begin>                                cache_begin_t;
+   typedef detail::bool_<power_2_buckets>                            power_2_buckets_t;
+   typedef detail::size_holder<constant_time_size, size_type>        size_traits;
+   typedef detail::size_holder<incremental, size_type, int>          split_traits;
+   typedef detail::group_functions<node_traits>                      group_functions_t;
+   typedef detail::node_functions<node_traits>                       node_functions_t;
+
+   private:
+   //noncopyable, movable
+   BOOST_MOVABLE_BUT_NOT_COPYABLE(hashtable_impl)
+
+   static const bool safemode_or_autounlink = is_safe_autounlink<real_value_traits::link_mode>::value;
+
+   //Constant-time size is incompatible with auto-unlink hooks!
+   BOOST_STATIC_ASSERT(!(constant_time_size && ((int)real_value_traits::link_mode == (int)auto_unlink)));
+   //Cache begin is incompatible with auto-unlink hooks!
+   BOOST_STATIC_ASSERT(!(cache_begin && ((int)real_value_traits::link_mode == (int)auto_unlink)));
+
+   template<class Disposer>
+   node_cast_adaptor< detail::node_disposer<Disposer, real_value_traits, CircularSListAlgorithms>
+                    , slist_node_ptr, node_ptr >
+      make_node_disposer(const Disposer &disposer) const
+   {
+      return node_cast_adaptor
+         < detail::node_disposer<Disposer, real_value_traits, CircularSListAlgorithms>
+         , slist_node_ptr, node_ptr >
+            (disposer, &this->priv_real_value_traits());
+   }
+
+   /// @endcond
+
+   public:
+   typedef detail::insert_commit_data_impl insert_commit_data;
+
+   typedef detail::transform_iterator
+      < typename slist_impl::iterator
+      , downcast_node_to_value_t
+         < real_value_traits
+         , false> >   local_iterator;
+
+   typedef detail::transform_iterator
+      < typename slist_impl::iterator
+      , downcast_node_to_value_t 
+         < real_value_traits
+         , true> >    const_local_iterator;
+
+   public:
+
+   //! <b>Requires</b>: buckets must not be being used by any other resource.
+   //!
+   //! <b>Effects</b>: Constructs an empty unordered_set, storing a reference
+   //!   to the bucket array and copies of the key_hasher and equal_func functors.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If value_traits::node_traits::node
+   //!   constructor throws (this does not happen with predefined Boost.Intrusive hooks)
+   //!   or the copy constructor or invocation of hash_func or equal_func throws.
+   //!
+   //! <b>Notes</b>: buckets array must be disposed only after
+   //!   *this is disposed.
+   explicit hashtable_impl ( const bucket_traits &b_traits
+                           , const hasher & hash_func = hasher()
+                           , const key_equal &equal_func = key_equal()
+                           , const value_traits &v_traits = value_traits())
+      :  data_type(b_traits, hash_func, equal_func, v_traits)
+   {
+      this->priv_initialize_buckets();
+      this->priv_size_traits().set_size(size_type(0));
+      size_type bucket_sz = this->priv_bucket_count();
+      BOOST_INTRUSIVE_INVARIANT_ASSERT(bucket_sz != 0);
+      //Check power of two bucket array if the option is activated
+      BOOST_INTRUSIVE_INVARIANT_ASSERT
+         (!power_2_buckets || (0 == (bucket_sz & (bucket_sz-1))));
+      this->priv_split_traits().set_size(bucket_sz>>1);
+   }
+
+   //! <b>Effects</b>: to-do
+   //!
+   hashtable_impl(BOOST_RV_REF(hashtable_impl) x)
+      : data_type( ::boost::move(x.priv_bucket_traits())
+             , ::boost::move(x.priv_hasher())
+             , ::boost::move(x.priv_equal())
+             , ::boost::move(x.priv_value_traits())
+             )
+   {
+      this->priv_swap_cache(x);
+      x.priv_initialize_cache();
+      if(constant_time_size){
+         this->priv_size_traits().set_size(size_type(0));
+         this->priv_size_traits().set_size(x.priv_size_traits().get_size());
+         x.priv_size_traits().set_size(size_type(0));
+      }
+      if(incremental){
+         this->priv_split_traits().set_size(x.priv_split_traits().get_size());
+         x.priv_split_traits().set_size(size_type(0));
+      }
+   }
+
+   //! <b>Effects</b>: to-do
+   //!
+   hashtable_impl& operator=(BOOST_RV_REF(hashtable_impl) x)
+   {  this->swap(x); return *this;  }
+
+   #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
+   //! <b>Effects</b>: Detaches all elements from this. The objects in the unordered_set
+   //!   are not deleted (i.e. no destructors are called).
+   //!
+   //! <b>Complexity</b>: Linear to the number of elements in the unordered_set, if
+   //!   it's a safe-mode or auto-unlink value. Otherwise constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   ~hashtable_impl()
+   {}
+   #endif
+
+   //! <b>Effects</b>: Returns an iterator pointing to the beginning of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Amortized constant time.
+   //!   Worst case (empty unordered_set): O(this->bucket_count())
+   //!
+   //! <b>Throws</b>: Nothing.
+   iterator begin()
+   {  return iterator(this->priv_begin(), &this->get_bucket_value_traits());   }
+
+   //! <b>Effects</b>: Returns a const_iterator pointing to the beginning
+   //!   of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Amortized constant time.
+   //!   Worst case (empty unordered_set): O(this->bucket_count())
+   //!
+   //! <b>Throws</b>: Nothing.
+   const_iterator begin() const
+   {  return this->cbegin();  }
+
+   //! <b>Effects</b>: Returns a const_iterator pointing to the beginning
+   //!   of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Amortized constant time.
+   //!   Worst case (empty unordered_set): O(this->bucket_count())
+   //!
+   //! <b>Throws</b>: Nothing.
+   const_iterator cbegin() const
+   {  return const_iterator(this->priv_begin(), &this->get_bucket_value_traits());   }
+
+   //! <b>Effects</b>: Returns an iterator pointing to the end of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   iterator end()
+   {  return iterator(this->priv_invalid_local_it(), 0);   }
+
+   //! <b>Effects</b>: Returns a const_iterator pointing to the end of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   const_iterator end() const
+   {  return this->cend(); }
+
+   //! <b>Effects</b>: Returns a const_iterator pointing to the end of the unordered_set.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   const_iterator cend() const
+   {  return const_iterator(this->priv_invalid_local_it(), 0);  }
+
+   //! <b>Effects</b>: Returns the hasher object used by the unordered_set.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If hasher copy-constructor throws.
+   hasher hash_function() const
+   {  return this->priv_hasher();  }
+
+   //! <b>Effects</b>: Returns the key_equal object used by the unordered_set.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If key_equal copy-constructor throws.
+   key_equal key_eq() const
+   {  return this->priv_equal();   }
+
+   //! <b>Effects</b>: Returns true if the container is empty.
+   //!
+   //! <b>Complexity</b>: if constant-time size and cache_begin options are disabled,
+   //!   average constant time (worst case, with empty() == true: O(this->bucket_count()).
+   //!   Otherwise constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   bool empty() const
+   {
+      if(constant_time_size){
+         return !this->size();
+      }
+      else if(cache_begin){
+         return this->begin() == this->end();
+      }
+      else{
+         size_type bucket_cnt = this->priv_bucket_count();
+         const bucket_type *b = boost::intrusive::detail::to_raw_pointer(this->priv_bucket_pointer());
+         for (size_type n = 0; n < bucket_cnt; ++n, ++b){
+            if(!b->empty()){
+               return false;
+            }
+         }
+         return true;
+      }
+   }
+
+   //! <b>Effects</b>: Returns the number of elements stored in the unordered_set.
+   //!
+   //! <b>Complexity</b>: Linear to elements contained in *this if
+   //!   constant_time_size is false. Constant-time otherwise.
+   //!
+   //! <b>Throws</b>: Nothing.
+   size_type size() const
+   {
+      if(constant_time_size)
+         return this->priv_size_traits().get_size();
+      else{
+         size_type len = 0;
+         size_type bucket_cnt = this->priv_bucket_count();
+         const bucket_type *b = boost::intrusive::detail::to_raw_pointer(this->priv_bucket_pointer());
+         for (size_type n = 0; n < bucket_cnt; ++n, ++b){
+            len += b->size();
+         }
+         return len;
+      }
+   }
+
+   //! <b>Requires</b>: the hasher and the equality function unqualified swap
+   //!   call should not throw.
+   //!
+   //! <b>Effects</b>: Swaps the contents of two unordered_sets.
+   //!   Swaps also the contained bucket array and equality and hasher functors.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If the swap() call for the comparison or hash functors
+   //!   found using ADL throw. Basic guarantee.
+   void swap(hashtable_impl& other)
+   {
+      using std::swap;
+      //These can throw
+      swap(this->priv_equal(), other.priv_equal());
+      swap(this->priv_hasher(), other.priv_hasher());
+      //These can't throw
+      swap(this->priv_bucket_traits(), other.priv_bucket_traits());
+      swap(this->priv_value_traits(), other.priv_value_traits());
+      this->priv_swap_cache(other);
+      if(constant_time_size){
+         size_type backup = this->priv_size_traits().get_size();
+         this->priv_size_traits().set_size(other.priv_size_traits().get_size());
+         other.priv_size_traits().set_size(backup);
+      }
+      if(incremental){
+         size_type backup = this->priv_split_traits().get_size();
+         this->priv_split_traits().set_size(other.priv_split_traits().get_size());
+         other.priv_split_traits().set_size(backup);
+      }
+   }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw
+   //!   Cloner should yield to nodes that compare equal and produce the same
+   //!   hash than the original node.
+   //!
+   //! <b>Effects</b>: Erases all the elements from *this
+   //!   calling Disposer::operator()(pointer), clones all the
+   //!   elements from src calling Cloner::operator()(const_reference )
+   //!   and inserts them on *this. The hash function and the equality
+   //!   predicate are copied from the source.
+   //!
+   //!   If store_hash option is true, this method does not use the hash function.
+   //!
+   //!   If any operation throws, all cloned elements are unlinked and disposed
+   //!   calling Disposer::operator()(pointer).
+   //!
+   //! <b>Complexity</b>: Linear to erased plus inserted elements.
+   //!
+   //! <b>Throws</b>: If cloner or hasher throw or hash or equality predicate copying
+   //!   throws. Basic guarantee.
+   template <class Cloner, class Disposer>
+   void clone_from(const hashtable_impl &src, Cloner cloner, Disposer disposer)
+   {
+      this->clear_and_dispose(disposer);
+      if(!constant_time_size || !src.empty()){
+         const size_type src_bucket_count = src.bucket_count();
+         const size_type dst_bucket_count = this->bucket_count();
+         //Check power of two bucket array if the option is activated
+         BOOST_INTRUSIVE_INVARIANT_ASSERT
+         (!power_2_buckets || (0 == (src_bucket_count & (src_bucket_count-1))));
+         BOOST_INTRUSIVE_INVARIANT_ASSERT
+         (!power_2_buckets || (0 == (dst_bucket_count & (dst_bucket_count-1))));
+
+         //If src bucket count is bigger or equal, structural copy is possible
+         if(!incremental && (src_bucket_count >= dst_bucket_count)){
+            //First clone the first ones
+            const bucket_ptr src_buckets = src.priv_bucket_pointer();
+            const bucket_ptr dst_buckets = this->priv_bucket_pointer();
+            size_type constructed;
+                                      
+            typedef node_cast_adaptor< detail::node_disposer<Disposer, real_value_traits, CircularSListAlgorithms>
+                                     , slist_node_ptr, node_ptr > NodeDisposer;
+            typedef node_cast_adaptor< detail::node_cloner  <Cloner,   real_value_traits, CircularSListAlgorithms>
+                                     , slist_node_ptr, node_ptr > NodeCloner;
+            NodeDisposer node_disp(disposer, &this->priv_real_value_traits());
+
+            detail::exception_array_disposer<bucket_type, NodeDisposer, size_type>
+               rollback(dst_buckets[0], node_disp, constructed);
+            for( constructed = 0
+               ; constructed < dst_bucket_count
+               ; ++constructed){
+               dst_buckets[constructed].clone_from
+                  ( src_buckets[constructed]
+                  , NodeCloner(cloner, &this->priv_real_value_traits()), node_disp);
+            }
+            if(src_bucket_count != dst_bucket_count){
+               //Now insert the remaining ones using the modulo trick
+               for(//"constructed" comes from the previous loop
+                  ; constructed < src_bucket_count
+                  ; ++constructed){
+                  bucket_type &dst_b =
+                     dst_buckets[detail::hash_to_bucket_split<power_2_buckets, incremental>(constructed, dst_bucket_count, dst_bucket_count)];
+                  bucket_type &src_b = src_buckets[constructed];
+                  for( siterator b(src_b.begin()), e(src_b.end())
+                     ; b != e
+                     ; ++b){
+                     dst_b.push_front(*(NodeCloner(cloner, &this->priv_real_value_traits())(*b.pointed_node())));
+                  }
+               }
+            }
+            this->priv_hasher() = src.priv_hasher();
+            this->priv_equal()  = src.priv_equal();
+            rollback.release();
+            this->priv_size_traits().set_size(src.priv_size_traits().get_size());
+            this->priv_split_traits().set_size(dst_bucket_count);
+            this->priv_insertion_update_cache(0u);
+            this->priv_erasure_update_cache();
+         }
+         else if(store_hash){
+            //Unlike previous cloning algorithm, this can throw
+            //if cloner, hasher or comparison functor throw
+            const_iterator b(src.begin()), e(src.end());
+            detail::exception_disposer<hashtable_impl, Disposer>
+               rollback(*this, disposer);
+            for(; b != e; ++b){
+               std::size_t hash_value = this->priv_stored_or_compute_hash(*b, store_hash_t());;
+               this->priv_insert_equal_with_hash(*cloner(*b), hash_value);
+            }
+            rollback.release();
+         }
+         else{
+            //Unlike previous cloning algorithm, this can throw
+            //if cloner, hasher or comparison functor throw
+            const_iterator b(src.begin()), e(src.end());
+            detail::exception_disposer<hashtable_impl, Disposer>
+               rollback(*this, disposer);
+            for(; b != e; ++b){
+               this->insert_equal(*cloner(*b));
+            }
+            rollback.release();
+         }
+      }
+   }
+
+   //! <b>Requires</b>: value must be an lvalue
+   //!
+   //! <b>Effects</b>: Inserts the value into the unordered_set.
+   //!
+   //! <b>Returns</b>: An iterator to the inserted value.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws. Strong guarantee.
+   //!
+   //! <b>Note</b>: Does not affect the validity of iterators and references.
+   //!   No copy-constructors are called.
+   iterator insert_equal(reference value)
+   {
+      size_type bucket_num;
+      std::size_t hash_value;
+      siterator prev;
+      siterator it = this->priv_find
+         (value, this->priv_hasher(), this->priv_equal(), bucket_num, hash_value, prev);
+      return this->priv_insert_equal_find(value, bucket_num, hash_value, it);
+   }
+
+   //! <b>Requires</b>: Dereferencing iterator must yield an lvalue
+   //!   of type value_type.
+   //!
+   //! <b>Effects</b>: Equivalent to this->insert_equal(t) for each element in [b, e).
+   //!
+   //! <b>Complexity</b>: Average case O(N), where N is std::distance(b, e).
+   //!   Worst case O(N*this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws. Basic guarantee.
+   //!
+   //! <b>Note</b>: Does not affect the validity of iterators and references.
+   //!   No copy-constructors are called.
+   template<class Iterator>
+   void insert_equal(Iterator b, Iterator e)
+   {
+      for (; b != e; ++b)
+         this->insert_equal(*b);
+   }
+
+   //! <b>Requires</b>: value must be an lvalue
+   //!
+   //! <b>Effects</b>: Tries to inserts value into the unordered_set.
+   //!
+   //! <b>Returns</b>: If the value
+   //!   is not already present inserts it and returns a pair containing the
+   //!   iterator to the new value and true. If there is an equivalent value
+   //!   returns a pair containing an iterator to the already present value
+   //!   and false.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws. Strong guarantee.
+   //!
+   //! <b>Note</b>: Does not affect the validity of iterators and references.
+   //!   No copy-constructors are called.
+   std::pair<iterator, bool> insert_unique(reference value)
+   {
+      insert_commit_data commit_data;
+      std::pair<iterator, bool> ret = this->insert_unique_check
+         (value, this->priv_hasher(), this->priv_equal(), commit_data);
+      if(!ret.second)
+         return ret;
+      return std::pair<iterator, bool>
+         (this->insert_unique_commit(value, commit_data), true);
+   }
+
+   //! <b>Requires</b>: Dereferencing iterator must yield an lvalue
+   //!   of type value_type.
+   //!
+   //! <b>Effects</b>: Equivalent to this->insert_unique(t) for each element in [b, e).
+   //!
+   //! <b>Complexity</b>: Average case O(N), where N is std::distance(b, e).
+   //!   Worst case O(N*this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws. Basic guarantee.
+   //!
+   //! <b>Note</b>: Does not affect the validity of iterators and references.
+   //!   No copy-constructors are called.
+   template<class Iterator>
+   void insert_unique(Iterator b, Iterator e)
+   {
+      for (; b != e; ++b)
+         this->insert_unique(*b);
+   }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Checks if a value can be inserted in the unordered_set, using
+   //!   a user provided key instead of the value itself.
+   //!
+   //! <b>Returns</b>: If there is an equivalent value
+   //!   returns a pair containing an iterator to the already present value
+   //!   and false. If the value can be inserted returns true in the returned
+   //!   pair boolean and fills "commit_data" that is meant to be used with
+   //!   the "insert_commit" function.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal_func throw. Strong guarantee.
+   //!
+   //! <b>Notes</b>: This function is used to improve performance when constructing
+   //!   a value_type is expensive: if there is an equivalent value
+   //!   the constructed object must be discarded. Many times, the part of the
+   //!   node that is used to impose the hash or the equality is much cheaper to
+   //!   construct than the value_type and this function offers the possibility to
+   //!   use that the part to check if the insertion will be successful.
+   //!
+   //!   If the check is successful, the user can construct the value_type and use
+   //!   "insert_commit" to insert the object in constant-time.
+   //!
+   //!   "commit_data" remains valid for a subsequent "insert_commit" only if no more
+   //!   objects are inserted or erased from the unordered_set.
+   //!
+   //!   After a successful rehashing insert_commit_data remains valid.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   std::pair<iterator, bool> insert_unique_check
+      ( const KeyType &key
+      , KeyHasher hash_func
+      , KeyValueEqual equal_func
+      , insert_commit_data &commit_data)
+   {
+      size_type bucket_num;
+      siterator prev;
+      siterator prev_pos =
+         this->priv_find(key, hash_func, equal_func, bucket_num, commit_data.hash, prev);
+      bool success = prev_pos == this->priv_invalid_local_it();
+      if(success){
+         prev_pos = prev;
+      }
+      return std::pair<iterator, bool>(iterator(prev_pos, &this->get_bucket_value_traits()),success);
+   }
+
+   //! <b>Requires</b>: value must be an lvalue of type value_type. commit_data
+   //!   must have been obtained from a previous call to "insert_check".
+   //!   No objects should have been inserted or erased from the unordered_set between
+   //!   the "insert_check" that filled "commit_data" and the call to "insert_commit".
+   //!
+   //! <b>Effects</b>: Inserts the value in the unordered_set using the information obtained
+   //!   from the "commit_data" that a previous "insert_check" filled.
+   //!
+   //! <b>Returns</b>: An iterator to the newly inserted object.
+   //!
+   //! <b>Complexity</b>: Constant time.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Notes</b>: This function has only sense if a "insert_check" has been
+   //!   previously executed to fill "commit_data". No value should be inserted or
+   //!   erased between the "insert_check" and "insert_commit" calls.
+   //!
+   //!   After a successful rehashing insert_commit_data remains valid.
+   iterator insert_unique_commit(reference value, const insert_commit_data &commit_data)
+   {
+      size_type bucket_num = this->priv_hash_to_bucket(commit_data.hash);
+      bucket_type &b = this->priv_bucket_pointer()[bucket_num];
+      this->priv_size_traits().increment();
+      node_ptr n = pointer_traits<node_ptr>::pointer_to(this->priv_value_to_node(value));
+      node_functions_t::store_hash(n, commit_data.hash, store_hash_t());
+      if(safemode_or_autounlink)
+         BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(node_algorithms::unique(n));
+      this->priv_insertion_update_cache(bucket_num);
+      group_functions_t::insert_in_group(node_ptr(), n, optimize_multikey_t());
+      return iterator(b.insert_after(b.before_begin(), *n), &this->get_bucket_value_traits());
+   }
+
+   //! <b>Effects</b>: Erases the element pointed to by i.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased element. No destructors are called.
+   void erase(const_iterator i)
+   {  this->erase_and_dispose(i, detail::null_disposer());  }
+
+   //! <b>Effects</b>: Erases the range pointed to by b end e.
+   //!
+   //! <b>Complexity</b>: Average case O(std::distance(b, e)),
+   //!   worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   void erase(const_iterator b, const_iterator e)
+   {  this->erase_and_dispose(b, e, detail::null_disposer());  }
+
+   //! <b>Effects</b>: Erases all the elements with the given value.
+   //!
+   //! <b>Returns</b>: The number of erased elements.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   //!   Basic guarantee.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   size_type erase(const_reference value)
+   {  return this->erase(value, this->priv_hasher(), this->priv_equal());  }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Erases all the elements that have the same hash and
+   //!   compare equal with the given key.
+   //!
+   //! <b>Returns</b>: The number of erased elements.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal_func throw. Basic guarantee.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   size_type erase(const KeyType& key, KeyHasher hash_func, KeyValueEqual equal_func)
+   {  return this->erase_and_dispose(key, hash_func, equal_func, detail::null_disposer()); }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
+   //!
+   //! <b>Effects</b>: Erases the element pointed to by i.
+   //!   Disposer::operator()(pointer) is called for the removed element.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators
+   //!    to the erased elements.
+   template<class Disposer>
+   void erase_and_dispose(const_iterator i, Disposer disposer
+                              /// @cond
+                              , typename detail::enable_if_c<!detail::is_convertible<Disposer, const_iterator>::value >::type * = 0
+                              /// @endcond
+                              )
+   {
+      this->priv_erase(i, disposer, optimize_multikey_t());
+      this->priv_size_traits().decrement();
+      this->priv_erasure_update_cache();
+   }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
+   //!
+   //! <b>Effects</b>: Erases the range pointed to by b end e.
+   //!   Disposer::operator()(pointer) is called for the removed elements.
+   //!
+   //! <b>Complexity</b>: Average case O(std::distance(b, e)),
+   //!   worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators
+   //!    to the erased elements.
+   template<class Disposer>
+   void erase_and_dispose(const_iterator b, const_iterator e, Disposer disposer)
+   {
+      if(b != e){
+         //Get the bucket number and local iterator for both iterators
+         siterator first_local_it(b.slist_it());
+         size_type first_bucket_num = this->priv_get_bucket_num(first_local_it);
+
+         const bucket_ptr buck_ptr = this->priv_bucket_pointer();
+         siterator before_first_local_it
+            = this->priv_get_previous(buck_ptr[first_bucket_num], first_local_it);
+         size_type last_bucket_num;
+         siterator last_local_it;
+
+         //For the end iterator, we will assign the end iterator
+         //of the last bucket
+         if(e == this->end()){
+            last_bucket_num   = this->bucket_count() - 1;
+            last_local_it     = buck_ptr[last_bucket_num].end();
+         }
+         else{
+            last_local_it     = e.slist_it();
+            last_bucket_num = this->priv_get_bucket_num(last_local_it);
+         }
+         this->priv_erase_range(before_first_local_it, first_bucket_num, last_local_it, last_bucket_num, disposer);
+         this->priv_erasure_update_cache_range(first_bucket_num, last_bucket_num);
+      }
+   }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
+   //!
+   //! <b>Effects</b>: Erases all the elements with the given value.
+   //!   Disposer::operator()(pointer) is called for the removed elements.
+   //!
+   //! <b>Returns</b>: The number of erased elements.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   //!   Basic guarantee.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   template<class Disposer>
+   size_type erase_and_dispose(const_reference value, Disposer disposer)
+   {  return this->erase_and_dispose(value, this->priv_hasher(), this->priv_equal(), disposer);   }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
+   //!
+   //! <b>Effects</b>: Erases all the elements with the given key.
+   //!   according to the comparison functor "equal_func".
+   //!   Disposer::operator()(pointer) is called for the removed elements.
+   //!
+   //! <b>Returns</b>: The number of erased elements.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal_func throw. Basic guarantee.
+   //!
+   //! <b>Note</b>: Invalidates the iterators
+   //!    to the erased elements.
+   template<class KeyType, class KeyHasher, class KeyValueEqual, class Disposer>
+   size_type erase_and_dispose(const KeyType& key, KeyHasher hash_func
+                              ,KeyValueEqual equal_func, Disposer disposer)
+   {
+      size_type bucket_num;
+      std::size_t h;
+      siterator prev;
+      siterator it = this->priv_find(key, hash_func, equal_func, bucket_num, h, prev);
+      bool success = it != this->priv_invalid_local_it();
+      size_type cnt(0);
+      if(!success){
+         return 0;
+      }
+      else if(optimize_multikey){
+         siterator last = bucket_type::s_iterator_to
+            (*node_traits::get_next(group_functions_t::get_last_in_group
+               (detail::dcast_bucket_ptr<node>(it.pointed_node()), optimize_multikey_t())));
+         this->priv_erase_range_impl(bucket_num, prev, last, disposer, cnt);
+      }
+      else{
+         //If found erase all equal values
+         bucket_type &b = this->priv_bucket_pointer()[bucket_num];
+         for(siterator end_sit = b.end(); it != end_sit; ++cnt, ++it){
+            slist_node_ptr n(it.pointed_node());
+            const value_type &v = this->priv_value_from_slist_node(n);
+            if(compare_hash){
+               std::size_t vh = this->priv_stored_or_compute_hash(v, store_hash_t());
+               if(h != vh || !equal_func(key, v)){
+                  break;
+               }
+            }
+            else if(!equal_func(key, v)){
+               break;
+            }
+            this->priv_size_traits().decrement();
+         }
+         b.erase_after_and_dispose(prev, it, make_node_disposer(disposer));
+      }
+      this->priv_erasure_update_cache();
+      return cnt;
+   }
+
+   //! <b>Effects</b>: Erases all of the elements.
+   //!
+   //! <b>Complexity</b>: Linear to the number of elements on the container.
+   //!   if it's a safe-mode or auto-unlink value_type. Constant time otherwise.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   void clear()
+   {
+      this->priv_clear_buckets();
+      this->priv_size_traits().set_size(size_type(0));
+   }
+
+   //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
+   //!
+   //! <b>Effects</b>: Erases all of the elements.
+   //!
+   //! <b>Complexity</b>: Linear to the number of elements on the container.
+   //!   Disposer::operator()(pointer) is called for the removed elements.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: Invalidates the iterators (but not the references)
+   //!    to the erased elements. No destructors are called.
+   template<class Disposer>
+   void clear_and_dispose(Disposer disposer)
+   {
+      if(!constant_time_size || !this->empty()){
+         size_type num_buckets = this->bucket_count();
+         bucket_ptr b = this->priv_bucket_pointer();
+         for(; num_buckets--; ++b){
+            b->clear_and_dispose(make_node_disposer(disposer));
+         }
+         this->priv_size_traits().set_size(size_type(0));
+      }
+      this->priv_initialize_cache();
+   }
+
+   //! <b>Effects</b>: Returns the number of contained elements with the given value
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   size_type count(const_reference value) const
+   {  return this->count(value, this->priv_hasher(), this->priv_equal());  }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Returns the number of contained elements with the given key
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal throw.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   size_type count(const KeyType &key, const KeyHasher &hash_func, const KeyValueEqual &equal_func) const
+   {
+      size_type bucket_n1, bucket_n2, cnt;
+      this->priv_equal_range(key, hash_func, equal_func, bucket_n1, bucket_n2, cnt);
+      return cnt;
+   }
+
+   //! <b>Effects</b>: Finds an iterator to the first element is equal to
+   //!   "value" or end() if that element does not exist.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   iterator find(const_reference value)
+   {  return this->find(value, this->priv_hasher(), this->priv_equal());   }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Finds an iterator to the first element whose key is
+   //!   "key" according to the given hash and equality functor or end() if
+   //!   that element does not exist.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal_func throw.
+   //!
+   //! <b>Note</b>: This function is used when constructing a value_type
+   //!   is expensive and the value_type can be compared with a cheaper
+   //!   key type. Usually this key is part of the value_type.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   iterator find(const KeyType &key, KeyHasher hash_func, KeyValueEqual equal_func)
+   {
+      size_type bucket_n;
+      std::size_t hash;
+      siterator prev;
+      siterator local_it = this->priv_find(key, hash_func, equal_func, bucket_n, hash, prev);
+      return iterator(local_it, &this->get_bucket_value_traits());
+   }
+
+   //! <b>Effects</b>: Finds a const_iterator to the first element whose key is
+   //!   "key" or end() if that element does not exist.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   const_iterator find(const_reference value) const
+   {  return this->find(value, this->priv_hasher(), this->priv_equal());   }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Finds an iterator to the first element whose key is
+   //!   "key" according to the given hasher and equality functor or end() if
+   //!   that element does not exist.
+   //!
+   //! <b>Complexity</b>: Average case O(1), worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or equal_func throw.
+   //!
+   //! <b>Note</b>: This function is used when constructing a value_type
+   //!   is expensive and the value_type can be compared with a cheaper
+   //!   key type. Usually this key is part of the value_type.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   const_iterator find
+      (const KeyType &key, KeyHasher hash_func, KeyValueEqual equal_func) const
+   {
+      size_type bucket_n;
+      std::size_t hash_value;
+      siterator prev;
+      siterator sit = this->priv_find(key, hash_func, equal_func, bucket_n, hash_value, prev);
+      return const_iterator(sit, &this->get_bucket_value_traits());
+   }
+
+   //! <b>Effects</b>: Returns a range containing all elements with values equivalent
+   //!   to value. Returns std::make_pair(this->end(), this->end()) if no such
+   //!   elements exist.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)). Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   std::pair<iterator,iterator> equal_range(const_reference value)
+   {  return this->equal_range(value, this->priv_hasher(), this->priv_equal());  }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Returns a range containing all elements with equivalent
+   //!   keys. Returns std::make_pair(this->end(), this->end()) if no such
+   //!   elements exist.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(key, hash_func, equal_func)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If hash_func or the equal_func throw.
+   //!
+   //! <b>Note</b>: This function is used when constructing a value_type
+   //!   is expensive and the value_type can be compared with a cheaper
+   //!   key type. Usually this key is part of the value_type.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   std::pair<iterator,iterator> equal_range
+      (const KeyType &key, KeyHasher hash_func, KeyValueEqual equal_func)
+   {
+      size_type bucket_n1, bucket_n2, cnt;
+      std::pair<siterator, siterator> ret = this->priv_equal_range
+         (key, hash_func, equal_func, bucket_n1, bucket_n2, cnt);
+      return std::pair<iterator, iterator>
+         (iterator(ret.first, &this->get_bucket_value_traits()), iterator(ret.second, &this->get_bucket_value_traits()));
+   }
+
+   //! <b>Effects</b>: Returns a range containing all elements with values equivalent
+   //!   to value. Returns std::make_pair(this->end(), this->end()) if no such
+   //!   elements exist.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(value)). Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the internal hasher or the equality functor throws.
+   std::pair<const_iterator, const_iterator>
+      equal_range(const_reference value) const
+   {  return this->equal_range(value, this->priv_hasher(), this->priv_equal());  }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //!   "equal_func" must be a equality function that induces
+   //!   the same equality as key_equal. The difference is that
+   //!   "equal_func" compares an arbitrary key with the contained values.
+   //!
+   //! <b>Effects</b>: Returns a range containing all elements with equivalent
+   //!   keys. Returns std::make_pair(this->end(), this->end()) if no such
+   //!   elements exist.
+   //!
+   //! <b>Complexity</b>: Average case O(this->count(key, hash_func, equal_func)).
+   //!   Worst case O(this->size()).
+   //!
+   //! <b>Throws</b>: If the hasher or equal_func throw.
+   //!
+   //! <b>Note</b>: This function is used when constructing a value_type
+   //!   is expensive and the value_type can be compared with a cheaper
+   //!   key type. Usually this key is part of the value_type.
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   std::pair<const_iterator,const_iterator> equal_range
+      (const KeyType &key, KeyHasher hash_func, KeyValueEqual equal_func) const
+   {
+      size_type bucket_n1, bucket_n2, cnt;
+      std::pair<siterator, siterator> ret =
+         this->priv_equal_range(key, hash_func, equal_func, bucket_n1, bucket_n2, cnt);
+      return std::pair<const_iterator, const_iterator>
+         (const_iterator(ret.first, &this->get_bucket_value_traits()), const_iterator(ret.second, &this->get_bucket_value_traits()));
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid iterator belonging to the unordered_set
+   //!   that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If the internal hash function throws.
+   iterator iterator_to(reference value)
+   {
+      return iterator(bucket_type::s_iterator_to(this->priv_value_to_node(value)), &this->get_bucket_value_traits());
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid const_iterator belonging to the
+   //!   unordered_set that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If the internal hash function throws.
+   const_iterator iterator_to(const_reference value) const
+   {
+      siterator sit = bucket_type::s_iterator_to(const_cast<node &>(this->priv_value_to_node(value)));
+      return const_iterator(sit, &this->get_bucket_value_traits());
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid local_iterator belonging to the unordered_set
+   //!   that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: This static function is available only if the <i>value traits</i>
+   //!   is stateless.
+   static local_iterator s_local_iterator_to(reference value)
+   {
+      BOOST_STATIC_ASSERT((!stateful_value_traits));
+      siterator sit = bucket_type::s_iterator_to(((hashtable_impl*)0)->priv_value_to_node(value));
+      return local_iterator(sit, const_real_value_traits_ptr());
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid const_local_iterator belonging to
+   //!   the unordered_set that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>: This static function is available only if the <i>value traits</i>
+   //!   is stateless.
+   static const_local_iterator s_local_iterator_to(const_reference value)
+   {
+      BOOST_STATIC_ASSERT((!stateful_value_traits));
+      siterator sit = bucket_type::s_iterator_to(((hashtable_impl*)0)->priv_value_to_node(const_cast<value_type&>(value)));
+      return const_local_iterator(sit, const_real_value_traits_ptr());
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid local_iterator belonging to the unordered_set
+   //!   that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   local_iterator local_iterator_to(reference value)
+   {
+      siterator sit = bucket_type::s_iterator_to(this->priv_value_to_node(value));
+      return local_iterator(sit, this->real_value_traits_ptr());
+   }
+
+   //! <b>Requires</b>: value must be an lvalue and shall be in a unordered_set of
+   //!   appropriate type. Otherwise the behavior is undefined.
+   //!
+   //! <b>Effects</b>: Returns: a valid const_local_iterator belonging to
+   //!   the unordered_set that points to the value
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   const_local_iterator local_iterator_to(const_reference value) const
+   {
+      siterator sit = bucket_type::s_iterator_to
+         (const_cast<node &>(this->priv_value_to_node(value)));
+      return const_local_iterator(sit, this->real_value_traits_ptr());
+   }
+
+   //! <b>Effects</b>: Returns the number of buckets passed in the constructor
+   //!   or the last rehash function.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   size_type bucket_count() const
+   {  return this->priv_bucket_count();   }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns the number of elements in the nth bucket.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   size_type bucket_size(size_type n) const
+   {  return this->priv_bucket_pointer()[n].size();   }
+
+   //! <b>Effects</b>: Returns the index of the bucket in which elements
+   //!   with keys equivalent to k would be found, if any such element existed.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If the hash functor throws.
+   //!
+   //! <b>Note</b>: the return value is in the range [0, this->bucket_count()).
+   size_type bucket(const key_type& k)  const
+   {  return this->bucket(k, this->priv_hasher());   }
+
+   //! <b>Requires</b>: "hash_func" must be a hash function that induces
+   //!   the same hash values as the stored hasher. The difference is that
+   //!   "hash_func" hashes the given key instead of the value_type.
+   //!
+   //! <b>Effects</b>: Returns the index of the bucket in which elements
+   //!   with keys equivalent to k would be found, if any such element existed.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: If hash_func throws.
+   //!
+   //! <b>Note</b>: the return value is in the range [0, this->bucket_count()).
+   template<class KeyType, class KeyHasher>
+   size_type bucket(const KeyType& k, const KeyHasher &hash_func)  const
+   {  return this->priv_hash_to_bucket(hash_func(k));   }
+
+   //! <b>Effects</b>: Returns the bucket array pointer passed in the constructor
+   //!   or the last rehash function.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   bucket_ptr bucket_pointer() const
+   {  return this->priv_bucket_pointer();   }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a local_iterator pointing to the beginning
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   local_iterator begin(size_type n)
+   {  return local_iterator(this->priv_bucket_pointer()[n].begin(), this->real_value_traits_ptr());  }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a const_local_iterator pointing to the beginning
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   const_local_iterator begin(size_type n) const
+   {  return this->cbegin(n);  }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a const_local_iterator pointing to the beginning
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   const_local_iterator cbegin(size_type n) const
+   {
+      siterator sit = const_cast<bucket_type&>(this->priv_bucket_pointer()[n]).begin();
+      return const_local_iterator(sit, this->real_value_traits_ptr());
+   }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a local_iterator pointing to the end
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   local_iterator end(size_type n)
+   {  return local_iterator(this->priv_bucket_pointer()[n].end(), this->real_value_traits_ptr());  }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a const_local_iterator pointing to the end
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   const_local_iterator end(size_type n) const
+   {  return this->cend(n);  }
+
+   //! <b>Requires</b>: n is in the range [0, this->bucket_count()).
+   //!
+   //! <b>Effects</b>: Returns a const_local_iterator pointing to the end
+   //!   of the sequence stored in the bucket n.
+   //!
+   //! <b>Complexity</b>: Constant.
+   //!
+   //! <b>Throws</b>: Nothing.
+   //!
+   //! <b>Note</b>:  [this->begin(n), this->end(n)) is a valid range
+   //!   containing all of the elements in the nth bucket.
+   const_local_iterator cend(size_type n) const
+   {
+      return const_local_iterator ( const_cast<bucket_type&>(this->priv_bucket_pointer()[n]).end()
+                                  , this->real_value_traits_ptr());
+   }
+
+   //! <b>Requires</b>: new_bucket_traits can hold a pointer to a new bucket array
+   //!   or the same as the old bucket array with a different length. new_size is the length of the
+   //!   the array pointed by new_buckets. If new_bucket_traits.bucket_begin() == this->bucket_pointer()
+   //!   new_bucket_traits.bucket_count() can be bigger or smaller than this->bucket_count().
+   //!   'new_bucket_traits' copy constructor should not throw.
+   //!
+   //! <b>Effects</b>: Updates the internal reference with the new bucket, erases
+   //!   the values from the old bucket and inserts then in the new one.
+   //!   Bucket traits hold by *this is assigned from new_bucket_traits.
+   //!   If the container is configured as incremental<>, the split bucket is set
+   //!   to the new bucket_count().
+   //!
+   //!   If store_hash option is true, this method does not use the hash function.
+   //!
+   //! <b>Complexity</b>: Average case linear in this->size(), worst case quadratic.
+   //!
+   //! <b>Throws</b>: If the hasher functor throws. Basic guarantee.
+   void rehash(const bucket_traits &new_bucket_traits)
+   {
+      const bucket_ptr new_buckets      = new_bucket_traits.bucket_begin();
+            size_type  new_bucket_count = new_bucket_traits.bucket_count();
+      const bucket_ptr old_buckets      = this->priv_bucket_pointer();
+            size_type  old_bucket_count = this->priv_bucket_count();
+
+      //Check power of two bucket array if the option is activated
+      BOOST_INTRUSIVE_INVARIANT_ASSERT
+      (!power_2_buckets || (0 == (new_bucket_count & (new_bucket_count-1u))));
+
+      size_type n = this->priv_get_cache_bucket_num();
+      const bool same_buffer = old_buckets == new_buckets;
+      //If the new bucket length is a common factor
+      //of the old one we can avoid hash calculations.
+      const bool fast_shrink = (!incremental) && (old_bucket_count > new_bucket_count) &&
+         (power_2_buckets ||(old_bucket_count % new_bucket_count) == 0);
+      //If we are shrinking the same bucket array and it's
+      //is a fast shrink, just rehash the last nodes
+      size_type new_first_bucket_num = new_bucket_count;
+      if(same_buffer && fast_shrink && (n < new_bucket_count)){
+         n = new_bucket_count;
+         new_first_bucket_num = this->priv_get_cache_bucket_num();
+      }
+
+      //Anti-exception stuff: they destroy the elements if something goes wrong.
+      //If the source and destination buckets are the same, the second rollback function
+      //is harmless, because all elements have been already unlinked and destroyed
+      typedef detail::init_disposer<node_algorithms> NodeDisposer;
+      NodeDisposer node_disp;
+      bucket_type & newbuck = new_buckets[0];
+      bucket_type & oldbuck = old_buckets[0];
+      detail::exception_array_disposer<bucket_type, NodeDisposer, size_type>
+         rollback1(newbuck, node_disp, new_bucket_count);
+      detail::exception_array_disposer<bucket_type, NodeDisposer, size_type>
+         rollback2(oldbuck, node_disp, old_bucket_count);
+
+      //Put size in a safe value for rollback exception
+      size_type size_backup = this->priv_size_traits().get_size();
+      this->priv_size_traits().set_size(0);
+      //Put cache to safe position
+      this->priv_initialize_cache();
+      this->priv_insertion_update_cache(size_type(0u));
+
+      //Iterate through nodes
+      for(; n < old_bucket_count; ++n){
+         bucket_type &old_bucket = old_buckets[n];
+
+         if(!fast_shrink){
+            siterator before_i(old_bucket.before_begin());
+            siterator end_sit(old_bucket.end());
+            siterator i(old_bucket.begin());
+            for(;i != end_sit; ++i){
+               const value_type &v = this->priv_value_from_slist_node(i.pointed_node());
+               const std::size_t hash_value = this->priv_stored_or_compute_hash(v, store_hash_t());
+               const size_type new_n = detail::hash_to_bucket_split<power_2_buckets, incremental>(hash_value, new_bucket_count, new_bucket_count);
+               if(cache_begin && new_n < new_first_bucket_num)
+                  new_first_bucket_num = new_n;
+               siterator last = bucket_type::s_iterator_to
+                  (*group_functions_t::get_last_in_group
+                     (detail::dcast_bucket_ptr<node>(i.pointed_node()), optimize_multikey_t()));
+               if(same_buffer && new_n == n){
+                  before_i = last;
+               }
+               else{
+                  bucket_type &new_b = new_buckets[new_n];
+                  new_b.splice_after(new_b.before_begin(), old_bucket, before_i, last);
+               }
+               i = before_i;
+            }
+         }
+         else{
+            const size_type new_n = detail::hash_to_bucket_split<power_2_buckets, incremental>(n, new_bucket_count, new_bucket_count);
+            if(cache_begin && new_n < new_first_bucket_num)
+               new_first_bucket_num = new_n;
+            bucket_type &new_b = new_buckets[new_n];
+            if(!old_bucket.empty()){
+               new_b.splice_after( new_b.before_begin()
+                                 , old_bucket
+                                 , old_bucket.before_begin()
+                                 , hashtable_impl::priv_get_last(old_bucket));
+            }
+         }
+      }
+
+      this->priv_size_traits().set_size(size_backup);
+      this->priv_split_traits().set_size(new_bucket_count);
+      this->priv_real_bucket_traits() = new_bucket_traits;
+      this->priv_initialize_cache();
+      this->priv_insertion_update_cache(new_first_bucket_num);
+      rollback1.release();
+      rollback2.release();
+   }
+
+   //! <b>Requires</b>:
+   //!
+   //! <b>Effects</b>:
+   //!
+   //! <b>Complexity</b>:
+   //!
+   //! <b>Throws</b>:
+   //!
+   //! <b>Note</b>: this method is only available if incremental<true> option is activated.
+   bool incremental_rehash(bool grow = true)
+   {
+      //This function is only available for containers with incremental hashing
+      BOOST_STATIC_ASSERT(( incremental && power_2_buckets ));
+      const size_type split_idx  = this->priv_split_traits().get_size();
+      const size_type bucket_cnt = this->priv_bucket_count();
+      const bucket_ptr buck_ptr  = this->priv_bucket_pointer();
+
+      if(grow){
+         //Test if the split variable can be changed
+         if(split_idx >= bucket_cnt)
+            return false;
+
+         const size_type bucket_to_rehash = split_idx - bucket_cnt/2;
+         bucket_type &old_bucket = buck_ptr[bucket_to_rehash];
+         siterator before_i(old_bucket.before_begin());
+         const siterator end_sit(old_bucket.end());
+         siterator i(old_bucket.begin());
+         this->priv_split_traits().increment();
+
+         //Anti-exception stuff: if an exception is thrown while
+         //moving elements from old_bucket to the target bucket, all moved
+         //elements are moved back to the original one.
+         detail::incremental_rehash_rollback<bucket_type, split_traits> rollback
+            ( buck_ptr[split_idx], old_bucket, this->priv_split_traits());
+         for(;i != end_sit; ++i){
+            const value_type &v = this->priv_value_from_slist_node(i.pointed_node());
+            const std::size_t hash_value = this->priv_stored_or_compute_hash(v, store_hash_t());
+            const size_type new_n = this->priv_hash_to_bucket(hash_value);
+            siterator last = bucket_type::s_iterator_to
+               (*group_functions_t::get_last_in_group
+                  (detail::dcast_bucket_ptr<node>(i.pointed_node()), optimize_multikey_t()));
+            if(new_n == bucket_to_rehash){
+               before_i = last;
+            }
+            else{
+               bucket_type &new_b = buck_ptr[new_n];
+               new_b.splice_after(new_b.before_begin(), old_bucket, before_i, last);
+            }
+            i = before_i;
+         }
+         rollback.release();
+         this->priv_erasure_update_cache();
+         return true;
+      }
+      else{
+         //Test if the split variable can be changed
+         if(split_idx <= bucket_cnt/2)
+            return false;
+         const size_type target_bucket_num = split_idx - 1 - bucket_cnt/2;
+         bucket_type &target_bucket = buck_ptr[target_bucket_num];
+         bucket_type &source_bucket = buck_ptr[split_idx-1];
+         target_bucket.splice_after(target_bucket.cbefore_begin(), source_bucket);
+         this->priv_split_traits().decrement();
+         this->priv_insertion_update_cache(target_bucket_num);
+         return true;
+      }
+   }
+
+   //! <b>Effects</b>: If new_bucket_traits.bucket_count() is not
+   //!   this->bucket_count()/2 or this->bucket_count()*2, or
+   //!   this->split_bucket() != new_bucket_traits.bucket_count() returns false
+   //!   and does nothing.
+   //!
+   //!   Otherwise, copy assigns new_bucket_traits to the internal bucket_traits
+   //!   and transfers all the objects from old buckets to the new ones.
+   //!
+   //! <b>Complexity</b>: Linear to size().
+   //!
+   //! <b>Throws</b>: Nothing
+   //!
+   //! <b>Note</b>: this method is only available if incremental<true> option is activated.
+   bool incremental_rehash(const bucket_traits &new_bucket_traits)
+   {
+      //This function is only available for containers with incremental hashing
+      BOOST_STATIC_ASSERT(( incremental && power_2_buckets ));
+      size_type new_bucket_traits_size = new_bucket_traits.bucket_count();
+      size_type cur_bucket_traits      = this->priv_bucket_count();
+      if(new_bucket_traits_size/2 != cur_bucket_traits && new_bucket_traits_size != cur_bucket_traits/2){
+         return false;
+      }
+
+      const size_type split_idx = this->split_count();
+
+      if(new_bucket_traits_size/2 == cur_bucket_traits){
+         //Test if the split variable can be changed
+         if(!(split_idx >= cur_bucket_traits))
+            return false;
+      }
+      else{
+         //Test if the split variable can be changed
+         if(!(split_idx <= cur_bucket_traits/2))
+            return false;
+      }
+
+      const size_type ini_n = this->priv_get_cache_bucket_num();
+      const bucket_ptr old_buckets = this->priv_bucket_pointer();
+      this->priv_real_bucket_traits() = new_bucket_traits;
+      if(new_bucket_traits.bucket_begin() != old_buckets){
+         for(size_type n = ini_n; n < split_idx; ++n){
+            bucket_type &new_bucket = new_bucket_traits.bucket_begin()[n];
+            bucket_type &old_bucket = old_buckets[n];
+            new_bucket.splice_after(new_bucket.cbefore_begin(), old_bucket);
+         }
+         //Put cache to safe position
+         this->priv_initialize_cache();
+         this->priv_insertion_update_cache(ini_n);
+      }
+      return true;
+   }
+
+   //! <b>Requires</b>:
+   //!
+   //! <b>Effects</b>:
+   //!
+   //! <b>Complexity</b>:
+   //!
+   //! <b>Throws</b>:
+   size_type split_count() const
+   {
+      //This function is only available if incremental hashing is activated
+      BOOST_STATIC_ASSERT(( incremental && power_2_buckets ));
+      return this->priv_split_traits().get_size();
+   }
+
+   //! <b>Effects</b>: Returns the nearest new bucket count optimized for
+   //!   the container that is bigger or equal than n. This suggestion can be
+   //!   used to create bucket arrays with a size that will usually improve
+   //!   container's performance. If such value does not exist, the
+   //!   higher possible value is returned.
+   //!
+   //! <b>Complexity</b>: Amortized constant time.
+   //!
+   //! <b>Throws</b>: Nothing.
+   static size_type suggested_upper_bucket_count(size_type n)
+   {
+      const std::size_t *primes     = &detail::prime_list_holder<0>::prime_list[0];
+      const std::size_t *primes_end = primes + detail::prime_list_holder<0>::prime_list_size;
+      std::size_t const* bound = std::lower_bound(primes, primes_end, n);
+      if(bound == primes_end)
+         --bound;
+      return size_type(*bound);
+   }
+
+   //! <b>Effects</b>: Returns the nearest new bucket count optimized for
+   //!   the container that is smaller or equal than n. This suggestion can be
+   //!   used to create bucket arrays with a size that will usually improve
+   //!   container's performance. If such value does not exist, the
+   //!   lowest possible value is returned.
+   //!
+   //! <b>Complexity</b>: Amortized constant time.
+   //!
+   //! <b>Throws</b>: Nothing.
+   static size_type suggested_lower_bucket_count(size_type n)
+   {
+      const std::size_t *primes     = &detail::prime_list_holder<0>::prime_list[0];
+      const std::size_t *primes_end = primes + detail::prime_list_holder<0>::prime_list_size;
+      size_type const* bound = std::upper_bound(primes, primes_end, n);
+      if(bound != primes)
+         --bound;
+      return size_type(*bound);
+   }
+
+   /// @cond
+   private:
+
+   void priv_clear_buckets(bucket_ptr buckets_ptr, size_type bucket_cnt)
+   {
+      for(; bucket_cnt--; ++buckets_ptr){
+         if(safemode_or_autounlink){
+            bucket_plus_vtraits_t::priv_clear_group_nodes(*buckets_ptr, optimize_multikey_t());
+            buckets_ptr->clear_and_dispose(detail::init_disposer<node_algorithms>());
+         }
+         else{
+            buckets_ptr->clear();
+         }
+      }
+      this->priv_initialize_cache();
+   }
+
+   void priv_initialize_buckets()
+   {  this->priv_clear_buckets(this->priv_bucket_pointer(), this->priv_bucket_count());  }
+
+   void priv_clear_buckets()
+   {
+      this->priv_clear_buckets
+         ( this->priv_get_cache()
+         , this->priv_bucket_count() - (this->priv_get_cache() - this->priv_bucket_pointer()));
+   }
+
+   std::size_t priv_hash_to_bucket(std::size_t hash_value) const
+   {
+      return detail::hash_to_bucket_split<power_2_buckets, incremental>
+         (hash_value, this->priv_real_bucket_traits().bucket_count(), this->priv_split_traits().get_size());
+   }
+
+   template<class Disposer>
+   void priv_erase_range_impl
+      (size_type bucket_num, siterator before_first_it, siterator end_sit, Disposer disposer, size_type &num_erased)
+   {
+      const bucket_ptr buckets = this->priv_bucket_pointer();
+      bucket_type &b = buckets[bucket_num];
+
+      if(before_first_it == b.before_begin() && end_sit == b.end()){
+         this->priv_erase_range_impl(bucket_num, 1, disposer, num_erased);
+      }
+      else{
+         num_erased = 0;
+         siterator to_erase(before_first_it);
+         ++to_erase;
+         slist_node_ptr end_ptr = end_sit.pointed_node();
+         while(to_erase != end_sit){
+            group_functions_t::erase_from_group(end_ptr, detail::dcast_bucket_ptr<node>(to_erase.pointed_node()), optimize_multikey_t());
+            to_erase = b.erase_after_and_dispose(before_first_it, make_node_disposer(disposer));
+            ++num_erased;
+         }
+         this->priv_size_traits().set_size(this->priv_size_traits().get_size()-num_erased);
+      }
+   }
+
+   template<class Disposer>
+   void priv_erase_range_impl
+      (size_type first_bucket_num, size_type num_buckets, Disposer disposer, size_type &num_erased)
+   {
+      //Now fully clear the intermediate buckets
+      const bucket_ptr buckets = this->priv_bucket_pointer();
+      num_erased = 0;
+      for(size_type i = first_bucket_num; i < (num_buckets + first_bucket_num); ++i){
+         bucket_type &b = buckets[i];
+         siterator b_begin(b.before_begin());
+         siterator nxt(b_begin);
+         ++nxt;
+         siterator end_sit(b.end());
+         while(nxt != end_sit){
+            group_functions_t::init_group(detail::dcast_bucket_ptr<node>(nxt.pointed_node()), optimize_multikey_t());
+            nxt = b.erase_after_and_dispose
+               (b_begin, make_node_disposer(disposer));
+            this->priv_size_traits().decrement();
+            ++num_erased;
+         }
+      }
+   }
+
+   template<class Disposer>
+   void priv_erase_range( siterator before_first_it,  size_type first_bucket
+                        , siterator last_it,          size_type last_bucket
+                        , Disposer disposer)
+   {
+      size_type num_erased;
+      if (first_bucket == last_bucket){
+         this->priv_erase_range_impl(first_bucket, before_first_it, last_it, disposer, num_erased);
+      }
+      else {
+         bucket_type *b = (&this->priv_bucket_pointer()[0]);
+         this->priv_erase_range_impl(first_bucket, before_first_it, b[first_bucket].end(), disposer, num_erased);
+         if(size_type n = (last_bucket - first_bucket - 1))
+            this->priv_erase_range_impl(first_bucket + 1, n, disposer, num_erased);
+         this->priv_erase_range_impl(last_bucket, b[last_bucket].before_begin(), last_it, disposer, num_erased);
+      }
+   }
+
+   std::size_t priv_get_bucket_num(siterator it)
+   {  return this->priv_get_bucket_num_hash_dispatch(it, store_hash_t());  }
+
+   std::size_t priv_get_bucket_num_hash_dispatch(siterator it, detail::true_)    //store_hash
+   {
+      return this->priv_hash_to_bucket
+         (this->priv_stored_hash(it.pointed_node(), store_hash_t()));
+   }
+
+   std::size_t priv_get_bucket_num_hash_dispatch(siterator it, detail::false_)   //NO store_hash
+   {  return this->priv_get_bucket_num_no_hash_store(it, optimize_multikey_t());  }
+
+   static siterator priv_get_previous(bucket_type &b, siterator i)
+   {  return bucket_plus_vtraits_t::priv_get_previous(b, i, optimize_multikey_t());   }
+
+   static siterator priv_get_last(bucket_type &b)
+   {  return bucket_plus_vtraits_t::priv_get_last(b, optimize_multikey_t());  }
+
+   template<class Disposer>
+   void priv_erase(const_iterator i, Disposer disposer, detail::true_)
+   {
+      slist_node_ptr elem(i.slist_it().pointed_node());
+      slist_node_ptr f_bucket_end, l_bucket_end;
+      if(store_hash){
+         f_bucket_end = l_bucket_end =
+         (this->priv_bucket_pointer()
+            [this->priv_hash_to_bucket
+               (this->priv_stored_hash(elem, store_hash_t()))
+            ]).before_begin().pointed_node();
+      }
+      else{
+         f_bucket_end = this->priv_bucket_pointer()->cend().pointed_node();
+         l_bucket_end = f_bucket_end + this->priv_bucket_count() - 1;
+      }
+      node_ptr nxt_in_group;
+      siterator prev = bucket_type::s_iterator_to
+         (*group_functions_t::get_previous_and_next_in_group
+            ( elem, nxt_in_group, f_bucket_end, l_bucket_end)
+         );
+      bucket_type::s_erase_after_and_dispose(prev, make_node_disposer(disposer));
+      if(nxt_in_group)
+         group_algorithms::unlink_after(nxt_in_group);
+      if(safemode_or_autounlink)
+         group_algorithms::init(detail::dcast_bucket_ptr<node>(elem));
+   }
+
+   template <class Disposer>
+   void priv_erase(const_iterator i, Disposer disposer, detail::false_)
+   {
+      siterator to_erase(i.slist_it());
+      bucket_type &b = this->priv_bucket_pointer()[this->priv_get_bucket_num(to_erase)];
+      siterator prev(this->priv_get_previous(b, to_erase));
+      b.erase_after_and_dispose(prev, make_node_disposer(disposer));
+   }
+
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   siterator priv_find
+      ( const KeyType &key,  KeyHasher hash_func
+      , KeyValueEqual equal_func, size_type &bucket_number, std::size_t &h, siterator &previt) const
+   {
+      h = hash_func(key);
+      return this->priv_find_with_hash(key, equal_func, bucket_number, h, previt);
+   }
+
+   template<class KeyType, class KeyValueEqual>
+   siterator priv_find_with_hash
+      ( const KeyType &key, KeyValueEqual equal_func, size_type &bucket_number, const std::size_t h, siterator &previt) const
+   {
+      bucket_number = this->priv_hash_to_bucket(h);
+      bucket_type &b = this->priv_bucket_pointer()[bucket_number];
+      previt = b.before_begin();
+      if(constant_time_size && this->empty()){
+         return this->priv_invalid_local_it();
+      }
+
+      siterator it = previt;
+      ++it;
+
+      while(it != b.end()){
+         const value_type &v = this->priv_value_from_slist_node(it.pointed_node());
+         if(compare_hash){
+            std::size_t vh = this->priv_stored_or_compute_hash(v, store_hash_t());
+            if(h == vh && equal_func(key, v)){
+               return it;
+            }
+         }
+         else if(equal_func(key, v)){
+            return it;
+         }
+         if(optimize_multikey){
+            previt = bucket_type::s_iterator_to
+               (*group_functions_t::get_last_in_group
+                  (detail::dcast_bucket_ptr<node>(it.pointed_node()), optimize_multikey_t()));
+            it = previt;
+         }
+         else{
+            previt = it;
+         }
+         ++it;
+      }
+      previt = b.before_begin();
+      return this->priv_invalid_local_it();
+   }
+
+   iterator priv_insert_equal_with_hash(reference value, std::size_t hash_value)
+   {
+      size_type bucket_num;
+      siterator prev;
+      siterator it = this->priv_find_with_hash
+         (value, this->priv_equal(), bucket_num, hash_value, prev);
+      return this->priv_insert_equal_find(value, bucket_num, hash_value, it);
+   }
+
+   iterator priv_insert_equal_find(reference value, size_type bucket_num, std::size_t hash_value, siterator it)
+   {
+      bucket_type &b = this->priv_bucket_pointer()[bucket_num];
+      bool found_equal = it != this->priv_invalid_local_it();
+      if(!found_equal){
+         it = b.before_begin();
+      }
+      //Now store hash if needed
+      node_ptr n = pointer_traits<node_ptr>::pointer_to(this->priv_value_to_node(value));
+      node_functions_t::store_hash(n, hash_value, store_hash_t());
+      //Checks for some modes
+      if(safemode_or_autounlink)
+         BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(node_algorithms::unique(n));
+      //Shortcut for optimize_multikey cases
+      if(optimize_multikey){
+         node_ptr first_in_group = found_equal ?
+            detail::dcast_bucket_ptr<node>(it.pointed_node()) : node_ptr();
+         group_functions_t::insert_in_group(first_in_group, n, optimize_multikey_t());
+      }
+      //Update cache and increment size if needed
+      this->priv_insertion_update_cache(bucket_num);
+      this->priv_size_traits().increment();
+      //Insert the element in the bucket after it
+      return iterator(b.insert_after(it, *n), &this->get_bucket_value_traits());
+   }
+
+   template<class KeyType, class KeyHasher, class KeyValueEqual>
+   std::pair<siterator, siterator> priv_equal_range
+      ( const KeyType &key
+      , KeyHasher hash_func
+      , KeyValueEqual equal_func
+      , size_type &bucket_number_first
+      , size_type &bucket_number_second
+      , size_type &cnt) const
+   {
+      std::size_t h;
+      cnt = 0;
+      siterator prev;
+      //Let's see if the element is present
+      std::pair<siterator, siterator> to_return
+         ( this->priv_find(key, hash_func, equal_func, bucket_number_first, h, prev)
+         , this->priv_invalid_local_it());
+      if(to_return.first == to_return.second){
+         bucket_number_second = bucket_number_first;
+         return to_return;
+      }
+      {
+         //If it's present, find the first that it's not equal in
+         //the same bucket
+         bucket_type &b = this->priv_bucket_pointer()[bucket_number_first];
+         siterator it = to_return.first;
+         if(optimize_multikey){
+            to_return.second = bucket_type::s_iterator_to
+               (*node_traits::get_next(group_functions_t::get_last_in_group
+                  (detail::dcast_bucket_ptr<node>(it.pointed_node()), optimize_multikey_t())));
+            cnt = std::distance(it, to_return.second);
+            if(to_return.second !=  b.end()){
+               bucket_number_second = bucket_number_first;
+               return to_return;
+            }
+         }
+         else{
+            ++cnt;
+            ++it;
+            while(it != b.end()){
+               const value_type &v = this->priv_value_from_slist_node(it.pointed_node());
+               if(compare_hash){
+                  std::size_t hv = this->priv_stored_or_compute_hash(v, store_hash_t());
+                  if(hv != h || !equal_func(key, v)){
+                     to_return.second = it;
+                     bucket_number_second = bucket_number_first;
+                     return to_return;
+                  }
+               }
+               else if(!equal_func(key, v)){
+                  to_return.second = it;
+                  bucket_number_second = bucket_number_first;
+                  return to_return;
+               }
+               ++it;
+               ++cnt;
+            }
+         }
+      }
+
+      //If we reached the end, find the first, non-empty bucket
+      for(bucket_number_second = bucket_number_first+1
+         ; bucket_number_second != this->priv_bucket_count()
+         ; ++bucket_number_second){
+         bucket_type &b = this->priv_bucket_pointer()[bucket_number_second];
+         if(!b.empty()){
+            to_return.second = b.begin();
+            return to_return;
+         }
+      }
+
+      //Otherwise, return the end node
+      to_return.second = this->priv_invalid_local_it();
+      return to_return;
+   }
+   /// @endcond
+};
+
+/// @cond
+#if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+template < class T
+         , bool UniqueKeys
+         , class PackedOptions
+         >
+#else
+template <class T, bool UniqueKeys, class ...Options>
+#endif
+struct make_real_bucket_traits
+{
+   //Real value traits must be calculated from options
+   typedef typename detail::get_value_traits
+      <T, typename PackedOptions::proto_value_traits>::type   value_traits;
+/*
+   static const bool resizable_bucket_traits =
+      detail::resizable_bool_is_true<bucket_traits_traits>::value;*/
+   typedef typename detail::get_real_value_traits<value_traits>::type real_value_traits;
+   typedef typename PackedOptions::bucket_traits            specified_bucket_traits;
+
+   //Real bucket traits must be calculated from options and calculated value_traits
+   typedef typename detail::get_slist_impl
+      <typename detail::reduced_slist_node_traits
+         <typename real_value_traits::node_traits>::type
+      >::type                                            slist_impl;
+
+   typedef typename
+      detail::if_c< detail::is_same
+                     < specified_bucket_traits
+                     , default_bucket_traits
+                     >::value
+                  , detail::bucket_traits_impl<slist_impl>
+                  , specified_bucket_traits
+                  >::type                                type;
+};
+/// @endcond
+
+//! Helper metafunction to define a \c hashtable that yields to the same type when the
+//! same options (either explicitly or implicitly) are used.
+#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED) || defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+template<class T, class ...Options>
+#else
+template<class T, class O1 = void, class O2 = void
+                , class O3 = void, class O4 = void
+                , class O5 = void, class O6 = void
+                , class O7 = void, class O8 = void
+                , class O9 = void, class O10= void
+                >
+#endif
+struct make_hashtable
+{
+   /// @cond
+   typedef typename pack_options
+      < hashtable_defaults,
+         #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+         O1, O2, O3, O4, O5, O6, O7, O8, O9, O10
+         #else
+         Options...
+         #endif
+      >::type packed_options;
+
+   typedef typename detail::get_value_traits
+      <T, typename packed_options::proto_value_traits>::type value_traits;
+
+   typedef typename make_real_bucket_traits
+            <T, false, packed_options>::type real_bucket_traits;
+
+   typedef hashtable_impl
+      < value_traits
+      , typename packed_options::hash
+      , typename packed_options::equal
+      , typename packed_options::size_type
+      , real_bucket_traits
+      ,  (std::size_t(false)*hash_bool_flags::unique_keys_pos)
+      |  (std::size_t(packed_options::constant_time_size)*hash_bool_flags::constant_time_size_pos)
+      |  (std::size_t(packed_options::power_2_buckets)*hash_bool_flags::power_2_buckets_pos)
+      |  (std::size_t(packed_options::cache_begin)*hash_bool_flags::cache_begin_pos)
+      |  (std::size_t(packed_options::compare_hash)*hash_bool_flags::compare_hash_pos)
+      |  (std::size_t(packed_options::incremental)*hash_bool_flags::incremental_pos)
+      > implementation_defined;
+
+   /// @endcond
+   typedef implementation_defined type;
+};
+
+#if !defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
+
+#if defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+template<class T, class ...Options>
+#else
+template<class T, class O1, class O2, class O3, class O4, class O5, class O6, class O7, class O8, class O9, class O10>
+#endif
+class hashtable
+   :  public make_hashtable<T,
+         #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+         O1, O2, O3, O4, O5, O6, O7, O8, O9, O10
+         #else
+         Options...
+         #endif
+         >::type
+{
+   typedef typename make_hashtable<T,
+      #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
+      O1, O2, O3, O4, O5, O6, O7, O8, O9, O10
+      #else
+      Options...
+      #endif
+      >::type   Base;
+   BOOST_MOVABLE_BUT_NOT_COPYABLE(hashtable)
+
+   public:
+   typedef typename Base::value_traits       value_traits;
+   typedef typename Base::real_value_traits  real_value_traits;
+   typedef typename Base::iterator           iterator;
+   typedef typename Base::const_iterator     const_iterator;
+   typedef typename Base::bucket_ptr         bucket_ptr;
+   typedef typename Base::size_type          size_type;
+   typedef typename Base::hasher             hasher;
+   typedef typename Base::bucket_traits      bucket_traits;
+   typedef typename Base::key_equal          key_equal;
+
+   //Assert if passed value traits are compatible with the type
+   BOOST_STATIC_ASSERT((detail::is_same<typename real_value_traits::value_type, T>::value));
+
+   explicit hashtable ( const bucket_traits &b_traits
+             , const hasher & hash_func = hasher()
+             , const key_equal &equal_func = key_equal()
+             , const value_traits &v_traits = value_traits())
+      :  Base(b_traits, hash_func, equal_func, v_traits)
+   {}
+
+   hashtable(BOOST_RV_REF(hashtable) x)
+      :  Base(::boost::move(static_cast<Base&>(x)))
+   {}
+
+   hashtable& operator=(BOOST_RV_REF(hashtable) x)
+   {  return static_cast<hashtable&>(this->Base::operator=(::boost::move(static_cast<Base&>(x))));  }
+};
+
+#endif
+
+} //namespace intrusive
+} //namespace boost
+
+#include <boost/intrusive/detail/config_end.hpp>
+
+#endif //BOOST_INTRUSIVE_HASHTABLE_HPP