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 /////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga  2013-2014
 //
 // 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_BSTREE_HPP
 #define BOOST_INTRUSIVE_BSTREE_HPP
 
 #include <boost/intrusive/detail/config_begin.hpp>
 #include <boost/intrusive/intrusive_fwd.hpp>
 
 #include <boost/intrusive/detail/assert.hpp>
 #include <boost/intrusive/intrusive_fwd.hpp>
 #include <boost/intrusive/bs_set_hook.hpp>
 #include <boost/intrusive/detail/tree_node.hpp>
 #include <boost/intrusive/detail/tree_iterator.hpp>
 #include <boost/intrusive/detail/ebo_functor_holder.hpp>
 #include <boost/intrusive/detail/mpl.hpp>
 #include <boost/intrusive/pointer_traits.hpp>
 #include <boost/intrusive/detail/is_stateful_value_traits.hpp>
 #include <boost/intrusive/detail/empty_node_checker.hpp>
 #include <boost/intrusive/detail/default_header_holder.hpp>
 #include <boost/intrusive/detail/reverse_iterator.hpp>
 #include <boost/intrusive/detail/exception_disposer.hpp>
 #include <boost/intrusive/detail/node_cloner_disposer.hpp>
 #include <boost/intrusive/detail/key_nodeptr_comp.hpp>
 #include <boost/intrusive/detail/simple_disposers.hpp>
 #include <boost/intrusive/detail/size_holder.hpp>
 #include <boost/intrusive/detail/algo_type.hpp>
 #include <boost/intrusive/detail/algorithm.hpp>
 #include <boost/intrusive/detail/tree_value_compare.hpp>
 
 #include <boost/intrusive/detail/get_value_traits.hpp>
 #include <boost/intrusive/bstree_algorithms.hpp>
 #include <boost/intrusive/link_mode.hpp>
 #include <boost/intrusive/parent_from_member.hpp>
 #include <boost/move/utility_core.hpp>
 #include <boost/move/adl_move_swap.hpp>
 
 #include <boost/intrusive/detail/minimal_pair_header.hpp>
 #include <cstddef>   //size_t...
 #include <boost/intrusive/detail/minimal_less_equal_header.hpp>//less, equal_to
 
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 namespace boost {
 namespace intrusive {
 
 /// @cond
 
 struct default_bstree_hook_applier
 {  template <class T> struct apply{ typedef typename T::default_bstree_hook type;  };  };
 
 template<>
 struct is_default_hook_tag<default_bstree_hook_applier>
 {  static const bool value = true;  };
 
 struct bstree_defaults
 {
    typedef default_bstree_hook_applier proto_value_traits;
    static const bool constant_time_size = true;
    typedef std::size_t size_type;
    typedef void compare;
    typedef void key_of_value;
    static const bool floating_point = true;  //For sgtree
    typedef void priority;  //For treap
    typedef void header_holder_type;
 };
 
 template<class ValueTraits, algo_types AlgoType, typename HeaderHolder>
 struct bstbase3
 {
    typedef ValueTraits                                               value_traits;
    typedef typename value_traits::node_traits                        node_traits;
    typedef typename node_traits::node                                node_type;
    typedef typename get_algo<AlgoType, node_traits>::type            node_algorithms;
    typedef typename node_traits::node_ptr                            node_ptr;
    typedef typename node_traits::const_node_ptr                      const_node_ptr;
    typedef tree_iterator<value_traits, false>                                                   iterator;
    typedef tree_iterator<value_traits, true>                                                    const_iterator;
    typedef boost::intrusive::reverse_iterator<iterator>                                         reverse_iterator;
    typedef boost::intrusive::reverse_iterator<const_iterator>                                   const_reverse_iterator;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::pointer)                               pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::const_pointer)                         const_pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<pointer>::element_type)               value_type;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<pointer>::reference)                  reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::reference)            const_reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::difference_type)      difference_type;
    typedef typename detail::get_header_holder_type
       < value_traits,HeaderHolder >::type                                                       header_holder_type;
 
    static const bool safemode_or_autounlink = is_safe_autounlink<value_traits::link_mode>::value;
    static const bool stateful_value_traits = detail::is_stateful_value_traits<value_traits>::value;
    static const bool has_container_from_iterator =
         detail::is_same< header_holder_type, detail::default_header_holder< node_traits > >::value;
 
    struct holder_t : public ValueTraits
    {
       inline explicit holder_t(const ValueTraits &vtraits)
          : ValueTraits(vtraits)
       {}
       header_holder_type root;
    } holder;
 
    static bstbase3 &get_tree_base_from_end_iterator(const const_iterator &end_iterator)
    {
       BOOST_INTRUSIVE_STATIC_ASSERT(has_container_from_iterator);
       node_ptr p = end_iterator.pointed_node();
       header_holder_type* h = header_holder_type::get_holder(p);
       holder_t *holder = get_parent_from_member<holder_t, header_holder_type>(h, &holder_t::root);
       bstbase3 *base   = get_parent_from_member<bstbase3, holder_t> (holder, &bstbase3::holder);
       return *base;
    }
 
    inline bstbase3(const ValueTraits &vtraits)
       : holder(vtraits)
    {
       node_algorithms::init_header(this->header_ptr());
    }
 
    inline node_ptr header_ptr()
    { return holder.root.get_node(); }
 
    inline const_node_ptr header_ptr() const
    { return holder.root.get_node(); }
 
    inline const value_traits &get_value_traits() const
    {  return this->holder;  }
 
    inline value_traits &get_value_traits()
    {  return this->holder;  }
 
    typedef typename boost::intrusive::value_traits_pointers
       <ValueTraits>::const_value_traits_ptr const_value_traits_ptr;
 
    inline const_value_traits_ptr priv_value_traits_ptr() const
    {  return pointer_traits<const_value_traits_ptr>::pointer_to(this->get_value_traits());  }
 
    inline iterator begin() BOOST_NOEXCEPT
    {  return iterator(node_algorithms::begin_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline const_iterator begin() const BOOST_NOEXCEPT
    {  return cbegin();   }
 
    inline const_iterator cbegin() const BOOST_NOEXCEPT
    {  return const_iterator(node_algorithms::begin_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline iterator end() BOOST_NOEXCEPT
    {  return iterator(node_algorithms::end_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline const_iterator end() const BOOST_NOEXCEPT
    {  return cend();  }
 
    inline const_iterator cend() const BOOST_NOEXCEPT
    {  return const_iterator(node_algorithms::end_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline iterator root()
    {  return iterator(node_algorithms::root_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline const_iterator root() const
    {  return croot();   }
 
    inline const_iterator croot() const
    {  return const_iterator(node_algorithms::root_node(this->header_ptr()), this->priv_value_traits_ptr());   }
 
    inline reverse_iterator rbegin()
    {  return reverse_iterator(end());  }
 
    inline const_reverse_iterator rbegin() const
    {  return const_reverse_iterator(end());  }
 
    inline const_reverse_iterator crbegin() const
    {  return const_reverse_iterator(end());  }
 
    inline reverse_iterator rend()
    {  return reverse_iterator(begin());   }
 
    inline const_reverse_iterator rend() const
    {  return const_reverse_iterator(begin());   }
 
    inline const_reverse_iterator crend() const
    {  return const_reverse_iterator(begin());   }
 
    void replace_node(iterator replace_this, reference with_this)
    {
       node_algorithms::replace_node( get_value_traits().to_node_ptr(*replace_this)
                                    , this->header_ptr()
                                    , get_value_traits().to_node_ptr(with_this));
       BOOST_IF_CONSTEXPR(safemode_or_autounlink)
          node_algorithms::init(replace_this.pointed_node());
    }
 
    inline void rebalance() BOOST_NOEXCEPT
    {  node_algorithms::rebalance(this->header_ptr()); }
 
    iterator rebalance_subtree(iterator r) BOOST_NOEXCEPT
    {  return iterator(node_algorithms::rebalance_subtree(r.pointed_node()), this->priv_value_traits_ptr()); }
 
    static iterator s_iterator_to(reference value) BOOST_NOEXCEPT
    {
       BOOST_INTRUSIVE_STATIC_ASSERT((!stateful_value_traits));
       return iterator (value_traits::to_node_ptr(value), const_value_traits_ptr());
    }
 
    static const_iterator s_iterator_to(const_reference value) BOOST_NOEXCEPT
    {
       BOOST_INTRUSIVE_STATIC_ASSERT((!stateful_value_traits));
       return const_iterator (value_traits::to_node_ptr(*pointer_traits<pointer>::const_cast_from(pointer_traits<const_pointer>::pointer_to(value))), const_value_traits_ptr());
    }
 
    iterator iterator_to(reference value) BOOST_NOEXCEPT
    {  return iterator (this->get_value_traits().to_node_ptr(value), this->priv_value_traits_ptr()); }
 
    const_iterator iterator_to(const_reference value) const BOOST_NOEXCEPT
    {  return const_iterator (this->get_value_traits().to_node_ptr(*pointer_traits<pointer>::const_cast_from(pointer_traits<const_pointer>::pointer_to(value))), this->priv_value_traits_ptr()); }
 
    inline static void init_node(reference value)
    { node_algorithms::init(value_traits::to_node_ptr(value)); }
 
 };
 
 template<class Less, class T>
 struct get_compare
 {
    typedef Less type;
 };
 
 template<class T>
 struct get_compare<void, T>
 {
    typedef ::std::less<T> type;
 };
 
 template<class KeyOfValue, class T>
 struct get_key_of_value
 {
    typedef KeyOfValue type;
 };
 
 template<class T>
 struct get_key_of_value<void, T>
 {
    typedef ::boost::intrusive::detail::identity<T> type;
 };
 
 template<class ValuePtr, class VoidOrKeyOfValue, class VoidOrKeyComp>
 struct bst_key_types
 {
    typedef typename
       boost::movelib::pointer_element<ValuePtr>::type value_type;
    typedef typename get_key_of_value
       < VoidOrKeyOfValue, value_type>::type           key_of_value;
    typedef typename key_of_value::type                key_type;
    typedef typename get_compare< VoidOrKeyComp
                       , key_type
                       >::type                         key_compare;
    typedef tree_value_compare
       <ValuePtr, key_compare, key_of_value>           value_compare;
 };
 
 template<class ValueTraits, class VoidOrKeyOfValue, class VoidOrKeyComp, algo_types AlgoType, typename HeaderHolder>
 struct bstbase2
    //Put the (possibly empty) functor in the first position to get EBO in MSVC
    //Use public inheritance to avoid MSVC bugs with closures
    : public detail::ebo_functor_holder
             < typename bst_key_types
                < typename ValueTraits::pointer
                , VoidOrKeyOfValue
                , VoidOrKeyComp
                
                >::value_compare
             >
    , public bstbase3<ValueTraits, AlgoType, HeaderHolder>
 {
    typedef bstbase3<ValueTraits, AlgoType, HeaderHolder>             treeheader_t;
    typedef bst_key_types< typename ValueTraits::pointer
                         , VoidOrKeyOfValue
                         , VoidOrKeyComp>                             key_types;
    typedef typename treeheader_t::value_traits                       value_traits;
    typedef typename treeheader_t::node_algorithms                    node_algorithms;
    typedef typename ValueTraits::value_type                          value_type;
    typedef typename key_types::key_type                              key_type;
    typedef typename key_types::key_of_value                          key_of_value;
    typedef typename key_types::key_compare                           key_compare;
    typedef typename key_types::value_compare                         value_compare;
    typedef typename treeheader_t::iterator                           iterator;
    typedef typename treeheader_t::const_iterator                     const_iterator;
    typedef typename treeheader_t::node_ptr                           node_ptr;
    typedef typename treeheader_t::const_node_ptr                     const_node_ptr;
 
    bstbase2(const key_compare &comp, const ValueTraits &vtraits)
       : detail::ebo_functor_holder<value_compare>(value_compare(comp)), treeheader_t(vtraits)
    {}
 
    const value_compare &get_comp() const
    {  return this->get();  }
 
    value_compare &get_comp()
    {  return this->get();  }
 
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::pointer)                               pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::const_pointer)                         const_pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<pointer>::reference)                  reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::reference)            const_reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::difference_type)      difference_type;
    typedef typename node_algorithms::insert_commit_data insert_commit_data;
 
    inline value_compare value_comp() const
    {  return this->get_comp();   }
 
    inline key_compare key_comp() const
    {  return this->get_comp().key_comp();   }
 
    //lower_bound
    inline iterator lower_bound(const key_type &key)
    {  return this->lower_bound(key, this->key_comp());   }
 
    inline const_iterator lower_bound(const key_type &key) const
    {  return this->lower_bound(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp)
    {
       return iterator(node_algorithms::lower_bound
          (this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       return const_iterator(node_algorithms::lower_bound
          (this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    //upper_bound
    inline iterator upper_bound(const key_type &key)
    {  return this->upper_bound(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    iterator upper_bound(const KeyType &key, KeyTypeKeyCompare comp)
    {
       return iterator(node_algorithms::upper_bound
          (this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    inline const_iterator upper_bound(const key_type &key) const
    {  return this->upper_bound(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator upper_bound(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       return const_iterator(node_algorithms::upper_bound
          (this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    template<class KeyTypeKeyCompare>
    struct key_node_comp_ret
    {  typedef detail::key_nodeptr_comp<KeyTypeKeyCompare, value_traits, key_of_value> type;  };
 
    template<class KeyTypeKeyCompare>
    inline typename key_node_comp_ret<KeyTypeKeyCompare>::type key_node_comp(KeyTypeKeyCompare comp) const
    {
       return detail::key_nodeptr_comp<KeyTypeKeyCompare, value_traits, key_of_value>(comp, &this->get_value_traits());
    }
 
    //find
    inline iterator find(const key_type &key)
    {  return this->find(key, this->key_comp()); }
 
    template<class KeyType, class KeyTypeKeyCompare>
    iterator find(const KeyType &key, KeyTypeKeyCompare comp)
    {
       return iterator
          (node_algorithms::find(this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    inline const_iterator find(const key_type &key) const
    {  return this->find(key, this->key_comp()); }
 
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator find(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       return const_iterator
          (node_algorithms::find(this->header_ptr(), key, this->key_node_comp(comp)), this->priv_value_traits_ptr());
    }
 
    //equal_range
    inline std::pair<iterator,iterator> equal_range(const key_type &key)
    {  return this->equal_range(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator,iterator> equal_range(const KeyType &key, KeyTypeKeyCompare comp)
    {
       std::pair<node_ptr, node_ptr> ret = 
          node_algorithms::equal_range(this->header_ptr(), key, this->key_node_comp(comp));
       return std::pair<iterator, iterator>( iterator(ret.first, this->priv_value_traits_ptr())
                                           , iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    inline std::pair<const_iterator, const_iterator>
       equal_range(const key_type &key) const
    {  return this->equal_range(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<const_iterator, const_iterator>
       equal_range(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       std::pair<node_ptr, node_ptr> ret =
          node_algorithms::equal_range(this->header_ptr(), key, this->key_node_comp(comp));
       return std::pair<const_iterator, const_iterator>( const_iterator(ret.first, this->priv_value_traits_ptr())
                                                       , const_iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    //lower_bound_range
    inline std::pair<iterator,iterator> lower_bound_range(const key_type &key)
    {  return this->lower_bound_range(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator,iterator> lower_bound_range(const KeyType &key, KeyTypeKeyCompare comp)
    {
       std::pair<node_ptr, node_ptr> ret =
          node_algorithms::lower_bound_range(this->header_ptr(), key, this->key_node_comp(comp));
       return std::pair<iterator, iterator>( iterator(ret.first, this->priv_value_traits_ptr())
                                           , iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    inline std::pair<const_iterator, const_iterator>
       lower_bound_range(const key_type &key) const
    {  return this->lower_bound_range(key, this->key_comp());   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<const_iterator, const_iterator>
       lower_bound_range(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       std::pair<node_ptr, node_ptr> ret =
          node_algorithms::lower_bound_range(this->header_ptr(), key, this->key_node_comp(comp));
       return std::pair<const_iterator, const_iterator>( const_iterator(ret.first, this->priv_value_traits_ptr())
                                                       , const_iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    //bounded_range
    inline std::pair<iterator,iterator> bounded_range
       (const key_type &lower_key, const key_type &upper_key, bool left_closed, bool right_closed)
    {  return this->bounded_range(lower_key, upper_key, this->key_comp(), left_closed, right_closed);   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator,iterator> bounded_range
       (const KeyType &lower_key, const KeyType &upper_key, KeyTypeKeyCompare comp, bool left_closed, bool right_closed)
    {
       std::pair<node_ptr, node_ptr> ret =
          node_algorithms::bounded_range
             (this->header_ptr(), lower_key, upper_key, this->key_node_comp(comp), left_closed, right_closed);
       return std::pair<iterator, iterator>( iterator(ret.first, this->priv_value_traits_ptr())
                                           , iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    inline std::pair<const_iterator,const_iterator> bounded_range
       (const key_type &lower_key, const key_type &upper_key, bool left_closed, bool right_closed) const
    {  return this->bounded_range(lower_key, upper_key, this->key_comp(), left_closed, right_closed);   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<const_iterator,const_iterator> bounded_range
       (const KeyType &lower_key, const KeyType &upper_key, KeyTypeKeyCompare comp, bool left_closed, bool right_closed) const
    {
       std::pair<node_ptr, node_ptr> ret =
          node_algorithms::bounded_range
             (this->header_ptr(), lower_key, upper_key, this->key_node_comp(comp), left_closed, right_closed);
       return std::pair<const_iterator, const_iterator>( const_iterator(ret.first, this->priv_value_traits_ptr())
                                                       , const_iterator(ret.second, this->priv_value_traits_ptr()));
    }
 
    //insert_unique_check
    inline std::pair<iterator, bool> insert_unique_check
       (const key_type &key, insert_commit_data &commit_data)
    {  return this->insert_unique_check(key, this->key_comp(), commit_data);   }
 
    inline std::pair<iterator, bool> insert_unique_check
       (const_iterator hint, const key_type &key, insert_commit_data &commit_data)
    {  return this->insert_unique_check(hint, key, this->key_comp(), commit_data);   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    BOOST_INTRUSIVE_DOC1ST(std::pair<iterator BOOST_INTRUSIVE_I bool>
       , typename detail::disable_if_convertible
          <KeyType BOOST_INTRUSIVE_I const_iterator BOOST_INTRUSIVE_I 
          std::pair<iterator BOOST_INTRUSIVE_I bool> >::type)
       insert_unique_check
       (const KeyType &key, KeyTypeKeyCompare comp, insert_commit_data &commit_data)
    {
       std::pair<node_ptr, bool> ret =
          (node_algorithms::insert_unique_check
             (this->header_ptr(), key, this->key_node_comp(comp), commit_data));
       return std::pair<iterator, bool>(iterator(ret.first, this->priv_value_traits_ptr()), ret.second);
    }
 
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator, bool> insert_unique_check
       (const_iterator hint, const KeyType &key, KeyTypeKeyCompare comp, insert_commit_data &commit_data)
    {
       std::pair<node_ptr, bool> ret =
          (node_algorithms::insert_unique_check
             (this->header_ptr(), hint.pointed_node(), key, this->key_node_comp(comp), commit_data));
       return std::pair<iterator, bool>(iterator(ret.first, this->priv_value_traits_ptr()), ret.second);
    }
 };
 
 //Due to MSVC's EBO implementation, to save space and maintain the ABI, we must put the non-empty size member
 //in the first position, but if size is not going to be stored then we'll use an specialization
 //that doesn't inherit from size_holder
 template<class ValueTraits, class VoidOrKeyOfValue, class VoidOrKeyComp, bool ConstantTimeSize, class SizeType, algo_types AlgoType, typename HeaderHolder>
 struct bstbase_hack
    : public detail::size_holder<ConstantTimeSize, SizeType>
    , public bstbase2 < ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, AlgoType, HeaderHolder>
 {
    typedef bstbase2< ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, AlgoType, HeaderHolder> base_type;
    typedef typename base_type::key_compare         key_compare;
    typedef typename base_type::value_compare       value_compare;
    typedef SizeType                                size_type;
    typedef typename base_type::node_traits         node_traits;
    typedef typename get_algo
       <AlgoType, node_traits>::type                algo_type;
 
    inline bstbase_hack(const key_compare & comp, const ValueTraits &vtraits)
       : base_type(comp, vtraits)
    {
       this->sz_traits().set_size(size_type(0));
    }
 
    typedef detail::size_holder<ConstantTimeSize, SizeType>     size_traits;
 
    inline size_traits &sz_traits()
    {  return static_cast<size_traits &>(*this);  }
 
    inline const size_traits &sz_traits() const
    {  return static_cast<const size_traits &>(*this);  }
 };
 
 //Specialization for ConstantTimeSize == false
 template<class ValueTraits, class VoidOrKeyOfValue, class VoidOrKeyComp, class SizeType, algo_types AlgoType, typename HeaderHolder>
 struct bstbase_hack<ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, false, SizeType, AlgoType, HeaderHolder>
    : public bstbase2 < ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, AlgoType, HeaderHolder>
 {
    typedef bstbase2< ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, AlgoType, HeaderHolder> base_type;
    typedef typename base_type::value_compare       value_compare;
    typedef typename base_type::key_compare         key_compare;
    inline bstbase_hack(const key_compare & comp, const ValueTraits &vtraits)
       : base_type(comp, vtraits)
    {}
 
    typedef detail::size_holder<false, SizeType>     size_traits;
 
    inline size_traits sz_traits() const
    {  return size_traits();  }
 };
 
 //This class will
 template<class ValueTraits, class VoidOrKeyOfValue, class VoidOrKeyComp, bool ConstantTimeSize, class SizeType, algo_types AlgoType, typename HeaderHolder>
 struct bstbase
    : public bstbase_hack< ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, ConstantTimeSize, SizeType, AlgoType, HeaderHolder>
 {
    typedef bstbase_hack< ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, ConstantTimeSize, SizeType, AlgoType, HeaderHolder> base_type;
    typedef ValueTraits                             value_traits;
    typedef typename base_type::value_compare       value_compare;
    typedef typename base_type::key_compare         key_compare;
    typedef typename base_type::const_reference     const_reference;
    typedef typename base_type::reference           reference;
    typedef typename base_type::iterator            iterator;
    typedef typename base_type::const_iterator      const_iterator;
    typedef typename base_type::node_traits         node_traits;
    typedef typename get_algo
       <AlgoType, node_traits>::type                node_algorithms;
    typedef SizeType                                size_type;
 
    inline bstbase(const key_compare & comp, const ValueTraits &vtraits)
       : base_type(comp, vtraits)
    {}
 
    //Detach all inserted nodes. This will add exception safety to bstree_impl
    //constructors inserting elements.
    ~bstbase()
    {
       if(is_safe_autounlink<value_traits::link_mode>::value){
          node_algorithms::clear_and_dispose
             ( this->header_ptr()
             , detail::node_disposer<detail::null_disposer, value_traits, AlgoType>
                (detail::null_disposer(), &this->get_value_traits()));
          node_algorithms::init(this->header_ptr());
       }
    }
 };
 
 
 /// @endcond
 
 //! The class template bstree is an unbalanced intrusive binary search tree
 //! container. The no-throw guarantee holds only, if the key_compare object
 //! doesn't throw.
 //!
 //! The complexity guarantees only hold if the tree is balanced, logarithmic
 //! complexity would increase to linear if the tree is totally unbalanced.
 //!
 //! 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<> and
 //! \c compare<>.
 #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 template<class T, class ...Options>
 #else
 template<class ValueTraits, class VoidOrKeyOfValue, class VoidOrKeyComp, class SizeType, bool ConstantTimeSize, algo_types AlgoType, typename HeaderHolder>
 #endif
 class bstree_impl
    :  public bstbase<ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, ConstantTimeSize, SizeType, AlgoType, HeaderHolder>
 {
    public:
    /// @cond
    typedef bstbase<ValueTraits, VoidOrKeyOfValue, VoidOrKeyComp, ConstantTimeSize, SizeType, AlgoType, HeaderHolder> data_type;
    typedef tree_iterator<ValueTraits, false> iterator_type;
    typedef tree_iterator<ValueTraits, true>  const_iterator_type;
    /// @endcond
 
    typedef BOOST_INTRUSIVE_IMPDEF(ValueTraits)                                                  value_traits;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::pointer)                               pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::const_pointer)                         const_pointer;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<pointer>::element_type)               value_type;
    typedef BOOST_INTRUSIVE_IMPDEF(typename data_type::key_type)                                 key_type;
    typedef BOOST_INTRUSIVE_IMPDEF(typename data_type::key_of_value)                             key_of_value;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<pointer>::reference)                  reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::reference)            const_reference;
    typedef BOOST_INTRUSIVE_IMPDEF(typename pointer_traits<const_pointer>::difference_type)      difference_type;
    typedef BOOST_INTRUSIVE_IMPDEF(SizeType)                                                     size_type;
    typedef BOOST_INTRUSIVE_IMPDEF(typename data_type::value_compare)                            value_compare;
    typedef BOOST_INTRUSIVE_IMPDEF(typename data_type::key_compare)                              key_compare;
    typedef BOOST_INTRUSIVE_IMPDEF(iterator_type)                                                iterator;
    typedef BOOST_INTRUSIVE_IMPDEF(const_iterator_type)                                          const_iterator;
    typedef BOOST_INTRUSIVE_IMPDEF(boost::intrusive::reverse_iterator<iterator>)                 reverse_iterator;
    typedef BOOST_INTRUSIVE_IMPDEF(boost::intrusive::reverse_iterator<const_iterator>)           const_reverse_iterator;
    typedef BOOST_INTRUSIVE_IMPDEF(typename value_traits::node_traits)                           node_traits;
    typedef BOOST_INTRUSIVE_IMPDEF(typename node_traits::node)                                   node;
    typedef BOOST_INTRUSIVE_IMPDEF(typename node_traits::node_ptr)                               node_ptr;
    typedef BOOST_INTRUSIVE_IMPDEF(typename node_traits::const_node_ptr)                         const_node_ptr;
    /// @cond
    typedef typename get_algo<AlgoType, node_traits>::type                                       algo_type;
    /// @endcond
    typedef BOOST_INTRUSIVE_IMPDEF(algo_type)                                                    node_algorithms;
 
    static const bool constant_time_size = ConstantTimeSize;
    static const bool stateful_value_traits = detail::is_stateful_value_traits<value_traits>::value;
    /// @cond
    private:
 
    //noncopyable
    BOOST_MOVABLE_BUT_NOT_COPYABLE(bstree_impl)
 
    static const bool safemode_or_autounlink = is_safe_autounlink<value_traits::link_mode>::value;
 
    //Constant-time size is incompatible with auto-unlink hooks!
    BOOST_INTRUSIVE_STATIC_ASSERT(!(constant_time_size && ((int)value_traits::link_mode == (int)auto_unlink)));
 
 
    protected:
 
 
    /// @endcond
 
    public:
 
    typedef typename node_algorithms::insert_commit_data insert_commit_data;
 
    //! <b>Effects</b>: Constructs an empty container.
    //!
    //! <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 of the key_compare object throws. Basic guarantee.
    bstree_impl()
       :  data_type(key_compare(), value_traits())
    {}
 
    //! <b>Effects</b>: Constructs an empty container with given comparison and traits.
    //!
    //! <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 of the key_compare object throws. Basic guarantee.
    explicit bstree_impl( const key_compare &cmp, const value_traits &v_traits = value_traits())
       :  data_type(cmp, v_traits)
    {}
 
    //! <b>Requires</b>: Dereferencing iterator must yield an lvalue of type value_type.
    //!   cmp must be a comparison function that induces a strict weak ordering.
    //!
    //! <b>Effects</b>: Constructs an empty container and inserts elements from
    //!   [b, e).
    //!
    //! <b>Complexity</b>: Linear in N if [b, e) is already sorted using
    //!   comp and otherwise N * log N, where N is the distance between first and last.
    //!
    //! <b>Throws</b>: If value_traits::node_traits::node
    //!   constructor throws (this does not happen with predefined Boost.Intrusive hooks)
    //!   or the copy constructor/operator() of the key_compare object throws. Basic guarantee.
    template<class Iterator>
    bstree_impl( bool unique, Iterator b, Iterator e
               , const key_compare &cmp     = key_compare()
               , const value_traits &v_traits = value_traits())
       : data_type(cmp, v_traits)
    {
       //bstbase releases elements in case of exceptions
       if(unique)
          this->insert_unique(b, e);
       else
          this->insert_equal(b, e);
    }
 
    //! <b>Effects</b>: Constructs a container moving resources from another container.
    //!   Internal comparison object and value traits are move constructed and
    //!   nodes belonging to x (except the node representing the "end") are linked to *this.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: If value_traits::node_traits::node's
    //!   move constructor throws (this does not happen with predefined Boost.Intrusive hooks)
    //!   or the move constructor of the comparison objet throws.
    bstree_impl(BOOST_RV_REF(bstree_impl) x)
       : data_type(::boost::move(x.get_comp()), ::boost::move(x.get_value_traits()))
    {
       this->swap(x);
    }
 
    //! <b>Effects</b>: Equivalent to swap
    //!
    inline bstree_impl& operator=(BOOST_RV_REF(bstree_impl) x)
    {  this->swap(x); return *this;  }
 
    #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
    //! <b>Effects</b>: Detaches all elements from this. The objects in the set
    //!   are not deleted (i.e. no destructors are called), but the nodes according to
    //!   the value_traits template parameter are reinitialized and thus can be reused.
    //!
    //! <b>Complexity</b>: Linear to elements contained in *this.
    //!
    //! <b>Throws</b>: Nothing.
    ~bstree_impl()
    {}
 
    //! <b>Effects</b>: Returns an iterator pointing to the beginning of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    iterator begin() BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the beginning of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator begin() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the beginning of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator cbegin() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns an iterator pointing to the end of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    iterator end() BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the end of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator end() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the end of the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator cend() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a reverse_iterator pointing to the beginning of the
    //!    reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    reverse_iterator rbegin() BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning
    //!    of the reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_reverse_iterator rbegin() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning
    //!    of the reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_reverse_iterator crbegin() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a reverse_iterator pointing to the end
    //!    of the reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    reverse_iterator rend() BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
    //!    of the reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_reverse_iterator rend() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
    //!    of the reversed container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_reverse_iterator crend() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a iterator pointing to the root node of the container or end() if not present.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    iterator root() BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the root node of the container or cend() if not present.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator root() const BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Returns a const_iterator pointing to the root node of the container or cend() if not present.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator croot() const BOOST_NOEXCEPT;
 
    #endif   //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
    //! <b>Precondition</b>: end_iterator must be a valid end iterator
    //!   of the container.
    //!
    //! <b>Effects</b>: Returns a const reference to the container associated to the end iterator
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    static bstree_impl &container_from_end_iterator(iterator end_iterator) BOOST_NOEXCEPT
    {
       return static_cast<bstree_impl&>
                (data_type::get_tree_base_from_end_iterator(end_iterator));
    }
 
    //! <b>Precondition</b>: end_iterator must be a valid end const_iterator
    //!   of the container.
    //!
    //! <b>Effects</b>: Returns a const reference to the container associated to the iterator
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    static const bstree_impl &container_from_end_iterator(const_iterator end_iterator) BOOST_NOEXCEPT
    {
       return static_cast<bstree_impl&>
                (data_type::get_tree_base_from_end_iterator(end_iterator));
    }
 
    //! <b>Precondition</b>: it must be a valid iterator
    //!   of the container.
    //!
    //! <b>Effects</b>: Returns a const reference to the container associated to the iterator
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Logarithmic.
    static bstree_impl &container_from_iterator(iterator it) BOOST_NOEXCEPT
    {  return container_from_end_iterator(it.end_iterator_from_it());   }
 
    //! <b>Precondition</b>: it must be a valid end const_iterator
    //!   of container.
    //!
    //! <b>Effects</b>: Returns a const reference to the container associated to the end iterator
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Logarithmic.
    static const bstree_impl &container_from_iterator(const_iterator it) BOOST_NOEXCEPT
    {  return container_from_end_iterator(it.end_iterator_from_it());   }
 
    #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
    //! <b>Effects</b>: Returns the key_compare object used by the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: If key_compare copy-constructor throws.
    key_compare key_comp() const;
 
    //! <b>Effects</b>: Returns the value_compare object used by the container.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: If value_compare copy-constructor throws.
    value_compare value_comp() const;
 
    #endif   //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
    //! <b>Effects</b>: Returns true if the container is empty.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    bool empty() const BOOST_NOEXCEPT
    {
       if(ConstantTimeSize){
          return !this->data_type::sz_traits().get_size();
       }
       else{
          return algo_type::unique(this->header_ptr());
       }
    }
 
    //! <b>Effects</b>: Returns the number of elements stored in the container.
    //!
    //! <b>Complexity</b>: Linear to elements contained in *this
    //!   if constant-time size option is disabled. Constant time otherwise.
    //!
    //! <b>Throws</b>: Nothing.
    size_type size() const BOOST_NOEXCEPT
    {
       BOOST_IF_CONSTEXPR(constant_time_size)
          return this->sz_traits().get_size();
       else{
          return (size_type)node_algorithms::size(this->header_ptr());
       }
    }
 
    //! <b>Effects</b>: Swaps the contents of two containers.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: If the comparison functor's swap call throws.
    void swap(bstree_impl& other)
    {
       //This can throw
       ::boost::adl_move_swap(this->get_comp(), other.get_comp());
       //These can't throw
       node_algorithms::swap_tree(this->header_ptr(), node_ptr(other.header_ptr()));
       this->sz_traits().swap(other.sz_traits());
    }
 
    //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
    //!   Cloner should yield to nodes equivalent to the original nodes.
    //!
    //! <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. Copies the predicate from the source container.
    //!
    //!   If cloner 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 throws or predicate copy assignment throws. Basic guarantee.
    template <class Cloner, class Disposer>
    void clone_from(const bstree_impl &src, Cloner cloner, Disposer disposer)
    {
       this->clear_and_dispose(disposer);
       if(!src.empty()){
          detail::exception_disposer<bstree_impl, Disposer>
             rollback(*this, disposer);
          node_algorithms::clone
             (src.header_ptr()
             ,this->header_ptr()
             ,detail::node_cloner <Cloner,    value_traits, AlgoType>(cloner,   &this->get_value_traits())
             ,detail::node_disposer<Disposer, value_traits, AlgoType>(disposer, &this->get_value_traits()));
          this->sz_traits().set_size(src.sz_traits().get_size());
          this->get_comp() = src.get_comp();
          rollback.release();
       }
    }
 
    //! <b>Requires</b>: Disposer::operator()(pointer) shouldn't throw.
    //!   Cloner should yield to nodes equivalent to the original nodes.
    //!
    //! <b>Effects</b>: Erases all the elements from *this
    //!   calling Disposer::operator()(pointer), clones all the
    //!   elements from src calling Cloner::operator()(reference)
    //!   and inserts them on *this. Copies the predicate from the source container.
    //!
    //!   If cloner 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 throws or predicate copy assignment throws. Basic guarantee.
    //!
    //! <b>Note</b>: This version can modify the source container, useful to implement
    //!    move semantics.
    template <class Cloner, class Disposer>
    void clone_from(BOOST_RV_REF(bstree_impl) src, Cloner cloner, Disposer disposer)
    {
       this->clear_and_dispose(disposer);
       if(!src.empty()){
          detail::exception_disposer<bstree_impl, Disposer>
             rollback(*this, disposer);
          node_algorithms::clone
             (src.header_ptr()
             ,this->header_ptr()
             ,detail::node_cloner <Cloner,    value_traits, AlgoType, false>(cloner,   &this->get_value_traits())
             ,detail::node_disposer<Disposer, value_traits, AlgoType>(disposer, &this->get_value_traits()));
          this->sz_traits().set_size(src.sz_traits().get_size());
          this->get_comp() = src.get_comp();
          rollback.release();
       }
    }
 
    //! <b>Requires</b>: value must be an lvalue
    //!
    //! <b>Effects</b>: Inserts value into the container before the upper bound.
    //!
    //! <b>Complexity</b>: Average complexity for insert element is at
    //!   most logarithmic.
    //!
    //! <b>Throws</b>: If the internal key_compare ordering function 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)
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
       iterator ret(node_algorithms::insert_equal_upper_bound
          (this->header_ptr(), to_insert, this->key_node_comp(this->key_comp())), this->priv_value_traits_ptr());
       this->sz_traits().increment();
       return ret;
    }
 
    //! <b>Requires</b>: value must be an lvalue, and "hint" must be
    //!   a valid iterator.
    //!
    //! <b>Effects</b>: Inserts x into the container, using "hint" as a hint to
    //!   where it will be inserted. If "hint" is the upper_bound
    //!   the insertion takes constant time (two comparisons in the worst case)
    //!
    //! <b>Complexity</b>: Logarithmic in general, but it is amortized
    //!   constant time if t is inserted immediately before hint.
    //!
    //! <b>Throws</b>: If the internal key_compare ordering function throws. Strong guarantee.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references.
    //!   No copy-constructors are called.
    iterator insert_equal(const_iterator hint, reference value)
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
       iterator ret(node_algorithms::insert_equal
          (this->header_ptr(), hint.pointed_node(), to_insert, this->key_node_comp(this->key_comp())), this->priv_value_traits_ptr());
       this->sz_traits().increment();
       return ret;
    }
 
    //! <b>Requires</b>: Dereferencing iterator must yield an lvalue
    //!   of type value_type.
    //!
    //! <b>Effects</b>: Inserts a each element of a range into the container
    //!   before the upper bound of the key of each element.
    //!
    //! <b>Complexity</b>: Insert range is in general O(N * log(N)), where N is the
    //!   size of the range. However, it is linear in N if the range is already sorted
    //!   by value_comp().
    //!
    //! <b>Throws</b>: If the comparison functor call throws.
    //!
    //! <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)
    {
       iterator iend(this->end());
       for (; b != e; ++b)
          this->insert_equal(iend, *b);
    }
 
    //! <b>Requires</b>: value must be an lvalue
    //!
    //! <b>Effects</b>: Inserts value into the container if the value
    //!   is not already present.
    //!
    //! <b>Complexity</b>: Average complexity for insert element is at
    //!   most logarithmic.
    //!
    //! <b>Throws</b>: If the comparison functor call throws.
    //!
    //! <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<node_ptr, bool> ret =
          (node_algorithms::insert_unique_check
             (this->header_ptr(), key_of_value()(value), this->key_node_comp(this->key_comp()), commit_data));
       return std::pair<iterator, bool>
          ( ret.second ? this->insert_unique_commit(value, commit_data)
                       : iterator(ret.first, this->priv_value_traits_ptr())
          , ret.second);
    }
 
    //! <b>Requires</b>: value must be an lvalue, and "hint" must be
    //!   a valid iterator
    //!
    //! <b>Effects</b>: Tries to insert x into the container, using "hint" as a hint
    //!   to where it will be inserted.
    //!
    //! <b>Complexity</b>: Logarithmic in general, but it is amortized
    //!   constant time (two comparisons in the worst case)
    //!   if t is inserted immediately before hint.
    //!
    //! <b>Throws</b>: If the comparison functor call throws.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references.
    //!   No copy-constructors are called.
    iterator insert_unique(const_iterator hint, reference value)
    {
       insert_commit_data commit_data;
       std::pair<node_ptr, bool> ret =
          (node_algorithms::insert_unique_check
             (this->header_ptr(), hint.pointed_node(), key_of_value()(value), this->key_node_comp(this->key_comp()), commit_data));
       return ret.second ? this->insert_unique_commit(value, commit_data)
                         : iterator(ret.first, this->priv_value_traits_ptr());
    }
 
    //! <b>Requires</b>: Dereferencing iterator must yield an lvalue
    //!   of type value_type.
    //!
    //! <b>Effects</b>: Tries to insert each element of a range into the container.
    //!
    //! <b>Complexity</b>: Insert range is in general O(N * log(N)), where N is the
    //!   size of the range. However, it is linear in N if the range is already sorted
    //!   by value_comp().
    //!
    //! <b>Throws</b>: If the comparison functor call throws.
    //!
    //! <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)
    {
       if(this->empty()){
          iterator iend(this->end());
          for (; b != e; ++b)
             this->insert_unique(iend, *b);
       }
       else{
          for (; b != e; ++b)
             this->insert_unique(*b);
       }
    }
 
    #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
    //! <b>Effects</b>: Checks if a value can be inserted in the container, 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 complexity is at most logarithmic.
    //!
    //! <b>Throws</b>: If the comp ordering function throws. Strong guarantee.
    std::pair<iterator, bool> insert_unique_check(const key_type &key, insert_commit_data &commit_data);
 
    //! <b>Effects</b>: Checks if a value can be inserted in the container, using
    //!   a user provided key instead of the value itself, using "hint"
    //!   as a hint to where it will be inserted.
    //!
    //! <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>: Logarithmic in general, but it's amortized
    //!   constant time if t is inserted immediately before hint.
    //!
    //! <b>Throws</b>: If the comp ordering function throws. Strong guarantee.
    std::pair<iterator, bool> insert_unique_check(const_iterator hint, const key_type &key, insert_commit_data &commit_data);
 
    //! <b>Requires</b>: comp must be a comparison function that induces
    //!   the same strict weak ordering as key_compare. The difference is that
    //!   comp compares an arbitrary key with the contained values.
    //!
    //! <b>Effects</b>: Checks if a value can be inserted in the container, 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 complexity is at most logarithmic.
    //!
    //! <b>Throws</b>: If the comp ordering function throws. 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 order is much cheaper to construct
    //!   than the value_type and this function offers the possibility to use that
    //!   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. This gives a total
    //!   logarithmic complexity to the insertion: check(O(log(N)) + commit(O(1)).
    //!
    //!   "commit_data" remains valid for a subsequent "insert_commit" only if no more
    //!   objects are inserted or erased from the container.
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator, bool> insert_unique_check
       (const KeyType &key, KeyTypeKeyCompare comp, insert_commit_data &commit_data);
 
    //! <b>Requires</b>: comp must be a comparison function that induces
    //!   the same strict weak ordering as key_compare. The difference is that
    //!   comp compares an arbitrary key with the contained values.
    //!
    //! <b>Effects</b>: Checks if a value can be inserted in the container, using
    //!   a user provided key instead of the value itself, using "hint"
    //!   as a hint to where it will be inserted.
    //!
    //! <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>: Logarithmic in general, but it's amortized
    //!   constant time if t is inserted immediately before hint.
    //!
    //! <b>Throws</b>: If the comp ordering function throws. 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
    //!   constructing that is used to impose the order is much cheaper to construct
    //!   than the value_type and this function offers the possibility to use that key
    //!   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. This can give a total
    //!   constant-time complexity to the insertion: check(O(1)) + commit(O(1)).
    //!
    //!   "commit_data" remains valid for a subsequent "insert_commit" only if no more
    //!   objects are inserted or erased from the container.
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator, bool> insert_unique_check
       (const_iterator hint, const KeyType &key
       ,KeyTypeKeyCompare comp, insert_commit_data &commit_data);
 
    #endif   //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
    //! <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 container between
    //!   the "insert_check" that filled "commit_data" and the call to "insert_commit".
    //!
    //! <b>Effects</b>: Inserts the value in the container 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.
    iterator insert_unique_commit(reference value, const insert_commit_data &commit_data) BOOST_NOEXCEPT
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
 
       #if !(defined(BOOST_DISABLE_ASSERTS) || ( defined(BOOST_ENABLE_ASSERT_DEBUG_HANDLER) && defined(NDEBUG) ))
       //Test insertion position is correct
       iterator p(commit_data.node, this->priv_value_traits_ptr());
       if(!commit_data.link_left){
          ++p;
       }
       //Check if the insertion point is correct to detect wrong
       //uses insert_unique_check
       BOOST_ASSERT(( p == this->end()   || !this->get_comp()(*p, value)   ));
       BOOST_ASSERT(( p == this->begin() || !this->get_comp()(value, *--p) ));
       #endif
 
       node_algorithms::insert_unique_commit
                (this->header_ptr(), to_insert, commit_data);
       this->sz_traits().increment();
       return iterator(to_insert, this->priv_value_traits_ptr());
    }
 
    //! <b>Requires</b>: value must be an lvalue, "pos" must be
    //!   a valid iterator (or end) and must be the succesor of value
    //!   once inserted according to the predicate
    //!
    //! <b>Effects</b>: Inserts x into the container before "pos".
    //!
    //! <b>Complexity</b>: Constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: This function does not check preconditions so if "pos" is not
    //! the successor of "value" container ordering invariant will be broken.
    //! This is a low-level function to be used only for performance reasons
    //! by advanced users.
    iterator insert_before(const_iterator pos, reference value) BOOST_NOEXCEPT
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
       this->sz_traits().increment();
       return iterator(node_algorithms::insert_before
          (this->header_ptr(), pos.pointed_node(), to_insert), this->priv_value_traits_ptr());
    }
 
    //! <b>Requires</b>: value must be an lvalue, and it must be no less
    //!   than the greatest inserted key
    //!
    //! <b>Effects</b>: Inserts x into the container in the last position.
    //!
    //! <b>Complexity</b>: Constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: This function does not check preconditions so if value is
    //!   less than the greatest inserted key container ordering invariant will be broken.
    //!   This function is slightly more efficient than using "insert_before".
    //!   This is a low-level function to be used only for performance reasons
    //!   by advanced users.
    void push_back(reference value) BOOST_NOEXCEPT
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
       this->sz_traits().increment();
       node_algorithms::push_back(this->header_ptr(), to_insert);
    }
 
    //! <b>Requires</b>: value must be an lvalue, and it must be no greater
    //!   than the minimum inserted key
    //!
    //! <b>Effects</b>: Inserts x into the container in the first position.
    //!
    //! <b>Complexity</b>: Constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: This function does not check preconditions so if value is
    //!   greater than the minimum inserted key container ordering invariant will be broken.
    //!   This function is slightly more efficient than using "insert_before".
    //!   This is a low-level function to be used only for performance reasons
    //!   by advanced users.
    void push_front(reference value) BOOST_NOEXCEPT
    {
       node_ptr to_insert(this->get_value_traits().to_node_ptr(value));
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || node_algorithms::unique(to_insert));
       this->sz_traits().increment();
       node_algorithms::push_front(this->header_ptr(), to_insert);
    }
 
    //! <b>Effects</b>: Erases the element pointed to by i.
    //!
    //! <b>Complexity</b>: Average complexity for erase element is constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators (but not the references)
    //!    to the erased elements. No destructors are called.
    iterator erase(const_iterator i) BOOST_NOEXCEPT
    {
       const_iterator ret(i);
       ++ret;
       node_ptr to_erase(i.pointed_node());
       BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || !node_algorithms::unique(to_erase));
       node_algorithms::erase(this->header_ptr(), to_erase);
       this->sz_traits().decrement();
       BOOST_IF_CONSTEXPR(safemode_or_autounlink)
          node_algorithms::init(to_erase);
       return ret.unconst();
    }
 
    //! <b>Effects</b>: Erases the range pointed to by b end e.
    //!
    //! <b>Complexity</b>: Average complexity for erase range is at most
    //!   O(log(size() + N)), where N is the number of elements in the range.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators (but not the references)
    //!    to the erased elements. No destructors are called.
    iterator erase(const_iterator b, const_iterator e) BOOST_NOEXCEPT
    {  size_type n;   return this->private_erase(b, e, n);   }
 
    //! <b>Effects</b>: Erases all the elements with the given value.
    //!
    //! <b>Returns</b>: The number of erased elements.
    //!
    //! <b>Complexity</b>: O(log(size() + N).
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators (but not the references)
    //!    to the erased elements. No destructors are called.
    size_type erase(const key_type &key) BOOST_NOEXCEPT
    {  return this->erase(key, this->key_comp());   }
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   comp(nk, key) and !comp(key, nk), with comp(nk, key) implying !comp(key, nk),
    //!   with nk the key_type of a value_type inserted into `*this`.
    //!
    //! <b>Effects</b>: Erases all the elements with the given key.
    //!   according to the comparison functor "comp".
    //!
    //! <b>Returns</b>: The number of erased elements.
    //!
    //! <b>Complexity</b>: O(log(size() + N).
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators (but not the references)
    //!    to the erased elements. No destructors are called.
    template<class KeyType, class KeyTypeKeyCompare>
    BOOST_INTRUSIVE_DOC1ST(size_type
       , typename detail::disable_if_convertible<KeyTypeKeyCompare BOOST_INTRUSIVE_I const_iterator BOOST_INTRUSIVE_I size_type>::type)
       erase(const KeyType& key, KeyTypeKeyCompare comp)
    {
       std::pair<iterator,iterator> p = this->equal_range(key, comp);
       size_type n;
       this->private_erase(p.first, p.second, n);
       return n;
    }
 
    //! <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 complexity for erase element is constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators
    //!    to the erased elements.
    template<class Disposer>
    iterator erase_and_dispose(const_iterator i, Disposer disposer) BOOST_NOEXCEPT
    {
       node_ptr to_erase(i.pointed_node());
       iterator ret(this->erase(i));
       disposer(this->get_value_traits().to_value_ptr(to_erase));
       return ret;
    }
 
    //! <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>: O(log(size() + N).
    //!
    //! <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>
    size_type erase_and_dispose(const key_type &key, Disposer disposer)
    {
       std::pair<iterator,iterator> p = this->equal_range(key);
       size_type n;
       this->private_erase(p.first, p.second, n, disposer);
       return n;
    }
 
    //! <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 complexity for erase range is at most
    //!   O(log(size() + N)), where N is the number of elements in the range.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators
    //!    to the erased elements.
    template<class Disposer>
    iterator erase_and_dispose(const_iterator b, const_iterator e, Disposer disposer) BOOST_NOEXCEPT
    {  size_type n;   return this->private_erase(b, e, n, disposer);   }
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   comp(nk, key) and !comp(key, nk), with comp(nk, key) implying !comp(key, nk)
    //!   and nk the key_type of a value_type inserted into `*this`.
    //!
    //! <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 "comp".
    //!   Disposer::operator()(pointer) is called for the removed elements.
    //!
    //! <b>Returns</b>: The number of erased elements.
    //!
    //! <b>Complexity</b>: O(log(size() + N).
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators
    //!    to the erased elements.
    template<class KeyType, class KeyTypeKeyCompare, class Disposer>
    BOOST_INTRUSIVE_DOC1ST(size_type
       , typename detail::disable_if_convertible<KeyTypeKeyCompare BOOST_INTRUSIVE_I const_iterator BOOST_INTRUSIVE_I size_type>::type)
       erase_and_dispose(const KeyType& key, KeyTypeKeyCompare comp, Disposer disposer)
    {
       std::pair<iterator,iterator> p = this->equal_range(key, comp);
       size_type n;
       this->private_erase(p.first, p.second, n, disposer);
       return n;
    }
 
    //! <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() BOOST_NOEXCEPT
    {
       BOOST_IF_CONSTEXPR(safemode_or_autounlink){
          this->clear_and_dispose(detail::null_disposer());
       }
       else{
          node_algorithms::init_header(this->header_ptr());
          this->sz_traits().set_size(0);
       }
    }
 
    //! <b>Effects</b>: Erases all of the elements calling disposer(p) for
    //!   each node to be erased.
    //! <b>Complexity</b>: Average complexity for is at most O(log(size() + N)),
    //!   where N is the number of elements in the container.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: Invalidates the iterators (but not the references)
    //!    to the erased elements. Calls N times to disposer functor.
    template<class Disposer>
    void clear_and_dispose(Disposer disposer) BOOST_NOEXCEPT
    {
       node_algorithms::clear_and_dispose(this->header_ptr()
          , detail::node_disposer<Disposer, value_traits, AlgoType>(disposer, &this->get_value_traits()));
       node_algorithms::init_header(this->header_ptr());
       this->sz_traits().set_size(0);
    }
 
    //! <b>Effects</b>: Returns the number of contained elements with the given value
    //!
    //! <b>Complexity</b>: Logarithmic to the number of elements contained plus lineal
    //!   to number of objects with the given value.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    size_type count(const key_type &key) const
    {  return size_type(this->count(key, this->key_comp()));   }
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   comp(nk, key) and !comp(key, nk), with comp(nk, key) implying !comp(key, nk),
    //!   and nk the key_type of a value_type inserted into `*this`.
    //!
    //! <b>Effects</b>: Returns the number of contained elements with the given key
    //!
    //! <b>Complexity</b>: Logarithmic to the number of elements contained plus lineal
    //!   to number of objects with the given key.
    //!
    //! <b>Throws</b>: If `comp` throws.
    template<class KeyType, class KeyTypeKeyCompare>
    size_type count(const KeyType &key, KeyTypeKeyCompare comp) const
    {
       std::pair<const_iterator, const_iterator> ret = this->equal_range(key, comp);
       size_type n = 0;
       for(; ret.first != ret.second; ++ret.first){ ++n; }
       return n;
    }
 
    #if !defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 
    //Add non-const overloads to theoretically const members
    //as some algorithms have different behavior when non-const versions are used (like splay trees).
    size_type count(const key_type &key)
    {  return size_type(this->count(key, this->key_comp()));   }
 
    template<class KeyType, class KeyTypeKeyCompare>
    size_type count(const KeyType &key, KeyTypeKeyCompare comp)
    {
       std::pair<const_iterator, const_iterator> ret = this->equal_range(key, comp);
       size_type n = 0;
       for(; ret.first != ret.second; ++ret.first){ ++n; }
       return n;
    }
 
    #else //defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 
    //! <b>Effects</b>: Returns an iterator to the first element whose
    //!   key is not less than k or end() if that element does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    iterator lower_bound(const key_type &key);
 
    //! <b>Effects</b>: Returns an iterator to the first element whose
    //!   key is not less than k or end() if that element does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    const_iterator lower_bound(const key_type &key) const;
 
    //! @copydoc ::boost::intrusive::bstree::lower_bound(const key_type &)
    template<class KeyType, class KeyTypeKeyCompare>
    iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp);
 
    //! @copydoc ::boost::intrusive::bstree::lower_bound(const KeyType&,KeyTypeKeyCompare)
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp) const;
 
    //! <b>Effects</b>: Returns an iterator to the first element whose
    //!   key is greater than k or end() if that element does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    iterator upper_bound(const key_type &key);
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   !comp(key, nk), with nk the key_type of a value_type inserted into `*this`.
    //!
    //! <b>Effects</b>: Returns an iterator to the first element whose
    //!   key is greater than k according to comp or end() if that element
    //!   does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `comp` throws.
    template<class KeyType, class KeyTypeKeyCompare>
    iterator upper_bound(const KeyType &key, KeyTypeKeyCompare comp);
 
    //! @copydoc ::boost::intrusive::bstree::upper_bound(const key_type &)
    const_iterator upper_bound(const key_type &key) const;
 
    //! @copydoc ::boost::intrusive::bstree::upper_bound(const KeyType&,KeyTypeKeyCompare)
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator upper_bound(const KeyType &key, KeyTypeKeyCompare comp) const;
 
    //! <b>Effects</b>: Finds an iterator to the first element whose key is
    //!   k or end() if that element does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    iterator find(const key_type &key);
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   comp(nk, key) and !comp(key, nk), with comp(nk, key) implying !comp(key, nk),
    //!   and nk the key_type of a value_type inserted into `*this`.
    //!
    //! <b>Effects</b>: Finds an iterator to the first element whose key is
    //!   k or end() if that element does not exist.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `comp` throws.
    template<class KeyType, class KeyTypeKeyCompare>
    iterator find(const KeyType &key, KeyTypeKeyCompare comp);
 
    //! @copydoc ::boost::intrusive::bstree::find(const key_type &)
    const_iterator find(const key_type &key) const;
 
    //! @copydoc ::boost::intrusive::bstree::find(const KeyType&,KeyTypeKeyCompare)
    template<class KeyType, class KeyTypeKeyCompare>
    const_iterator find(const KeyType &key, KeyTypeKeyCompare comp) const;
 
    //! <b>Effects</b>: Finds a range containing all elements whose key is k or
    //!   an empty range that indicates the position where those elements would be
    //!   if they there is no elements with key k.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    std::pair<iterator,iterator> equal_range(const key_type &key);
 
    //! <b>Requires</b>: key is a value such that `*this` is partitioned with respect to
    //!   comp(nk, key) and !comp(key, nk), with comp(nk, key) implying !comp(key, nk),
    //!   with nk the key_type of a value_type inserted into `*this`.
    //!
    //! <b>Effects</b>: Finds a range containing all elements whose key is k or
    //!   an empty range that indicates the position where those elements would be
    //!   if they there is no elements with key k.
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `comp` throws.
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator,iterator> equal_range(const KeyType &key, KeyTypeKeyCompare comp);
 
    //! @copydoc ::boost::intrusive::bstree::equal_range(const key_type &)
    std::pair<const_iterator, const_iterator> equal_range(const key_type &key) const;
 
    //! @copydoc ::boost::intrusive::bstree::equal_range(const KeyType&,KeyTypeKeyCompare)
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<const_iterator, const_iterator>
       equal_range(const KeyType &key, KeyTypeKeyCompare comp) const;
 
    //! <b>Requires</b>:
    //!   `upper_key` shall not precede `lower_key` according to key_compare.
    //!   [key_comp()(upper_key, lower_key) shall be false]
    //!
    //!   If `lower_key` is equivalent to `upper_key`
    //!   [!key_comp()(upper_key, lower_key) && !key_comp()(lower_key, upper_key)] then
    //!   ('left_closed' || 'right_closed') must be false.
    //!
    //! <b>Effects</b>: Returns an a pair with the following criteria:
    //!
    //!   first = lower_bound(lower_key) if left_closed, upper_bound(lower_key) otherwise
    //!
    //!   second = upper_bound(upper_key) if right_closed, lower_bound(upper_key) otherwise
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `key_compare` throws.
    //!
    //! <b>Note</b>: This function can be more efficient than calling upper_bound
    //!   and lower_bound for lower_value and upper_value.
    //!
    //! <b>Note</b>: Experimental function, the interface might change in future releases.
    std::pair<iterator,iterator> bounded_range
       (const key_type &lower_key, const key_type &upper_value, bool left_closed, bool right_closed);
 
    //! <b>Requires</b>:
    //!   `lower_key` is a value such that `*this` is partitioned with respect to
    //!   comp(nk, lower_key) if left_closed is true, with respect to !comp(lower_key, nk) otherwise.
    //!
    //! `upper_key` is a value such that `*this` is partitioned with respect to
    //!   !comp(upper_key, nk) if right_closed is true, with respect to comp(nk, upper_key) otherwise.
    //!
    //!   `upper_key` shall not precede `lower_key` according to comp
    //!   [comp(upper_key, lower_key) shall be false]
    //!
    //!   If `lower_key` is equivalent to `upper_key`
    //!   [!comp(upper_key, lower_key) && !comp(lower_key, upper_key)] then
    //!   ('left_closed' || 'right_closed') must be false.
    //!
    //! <b>Effects</b>: Returns an a pair with the following criteria:
    //!
    //!   first = lower_bound(lower_key, comp) if left_closed, upper_bound(lower_key, comp) otherwise
    //!
    //!   second = upper_bound(upper_key, comp) if right_closed, lower_bound(upper_key, comp) otherwise
    //!
    //! <b>Complexity</b>: Logarithmic.
    //!
    //! <b>Throws</b>: If `comp` throws.
    //!
    //! <b>Note</b>: This function can be more efficient than calling upper_bound
    //!   and lower_bound for lower_key and upper_key.
    //!
    //! <b>Note</b>: Experimental function, the interface might change in future releases.
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<iterator,iterator> bounded_range
       (const KeyType &lower_key, const KeyType &upper_key, KeyTypeKeyCompare comp, bool left_closed, bool right_closed);
    
    //! @copydoc ::boost::intrusive::bstree::bounded_range(const key_type &,const key_type &,bool,bool)
    std::pair<const_iterator,const_iterator> bounded_range
       (const key_type &lower_key, const key_type &upper_key, bool left_closed, bool right_closed) const;
 
    //! @copydoc ::boost::intrusive::bstree::bounded_range(const KeyType&,const KeyType&,KeyTypeKeyCompare,bool,bool)
    template<class KeyType, class KeyTypeKeyCompare>
    std::pair<const_iterator,const_iterator> bounded_range
       (const KeyType &lower_key, const KeyType &upper_key, KeyTypeKeyCompare comp, bool left_closed, bool right_closed) const;
 
    //! <b>Requires</b>: value must be an lvalue and shall be in a set of
    //!   appropriate type. Otherwise the behavior is undefined.
    //!
    //! <b>Effects</b>: Returns: a valid iterator i belonging to the 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 iterator s_iterator_to(reference value) BOOST_NOEXCEPT;
 
    //! <b>Requires</b>: value must be an lvalue and shall be in a set of
    //!   appropriate type. Otherwise the behavior is undefined.
    //!
    //! <b>Effects</b>: Returns: a valid const_iterator i belonging to the
    //!   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_iterator s_iterator_to(const_reference value) BOOST_NOEXCEPT;
 
    //! <b>Requires</b>: value must be an lvalue and shall be in a set of
    //!   appropriate type. Otherwise the behavior is undefined.
    //!
    //! <b>Effects</b>: Returns: a valid iterator i belonging to the set
    //!   that points to the value
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    iterator iterator_to(reference value) BOOST_NOEXCEPT;
 
    //! <b>Requires</b>: value must be an lvalue and shall be in a set of
    //!   appropriate type. Otherwise the behavior is undefined.
    //!
    //! <b>Effects</b>: Returns: a valid const_iterator i belonging to the
    //!   set that points to the value
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    const_iterator iterator_to(const_reference value) const BOOST_NOEXCEPT;
 
    //! <b>Requires</b>: value shall not be in a container.
    //!
    //! <b>Effects</b>: init_node puts the hook of a value in a well-known default
    //!   state.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant time.
    //!
    //! <b>Note</b>: This function puts the hook in the well-known default state
    //!   used by auto_unlink and safe hooks.
    static void init_node(reference value) BOOST_NOEXCEPT;
 
    #endif   //#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 
    //! <b>Effects</b>: Unlinks the leftmost node from the container.
    //!
    //! <b>Complexity</b>: Average complexity is constant time.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Notes</b>: This function breaks the container and the container can
    //!   only be used for more unlink_leftmost_without_rebalance calls.
    //!   This function is normally used to achieve a step by step
    //!   controlled destruction of the container.
    pointer unlink_leftmost_without_rebalance() BOOST_NOEXCEPT
    {
       node_ptr to_be_disposed(node_algorithms::unlink_leftmost_without_rebalance
                            (this->header_ptr()));
       if(!to_be_disposed)
          return 0;
       this->sz_traits().decrement();
       BOOST_IF_CONSTEXPR(safemode_or_autounlink)//If this is commented does not work with normal_link
          node_algorithms::init(to_be_disposed);
       return this->get_value_traits().to_value_ptr(to_be_disposed);
    }
 
    #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 
    //! <b>Requires</b>: replace_this must be a valid iterator of *this
    //!   and with_this must not be inserted in any container.
    //!
    //! <b>Effects</b>: Replaces replace_this in its position in the
    //!   container with with_this. The container does not need to be rebalanced.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Note</b>: This function will break container ordering invariants if
    //!   with_this is not equivalent to *replace_this according to the
    //!   ordering rules. This function is faster than erasing and inserting
    //!   the node, since no rebalancing or comparison is needed.
    void replace_node(iterator replace_this, reference with_this) BOOST_NOEXCEPT;
 
    //! <b>Effects</b>: Rebalances the tree.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear.
    void rebalance() BOOST_NOEXCEPT;
 
    //! <b>Requires</b>: old_root is a node of a tree.
    //!
    //! <b>Effects</b>: Rebalances the subtree rooted at old_root.
    //!
    //! <b>Returns</b>: The new root of the subtree.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the elements in the subtree.
    iterator rebalance_subtree(iterator r) BOOST_NOEXCEPT;
 
    #endif   //#if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
 
    //! <b>Effects</b>: removes "value" from the container.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Logarithmic time.
    //!
    //! <b>Note</b>: This static function is only usable with non-constant
    //! time size containers that have stateless comparison functors.
    //!
    //! If the user calls
    //! this function with a constant time size container or stateful comparison
    //! functor a compilation error will be issued.
    static void remove_node(reference value) BOOST_NOEXCEPT
    {
       BOOST_INTRUSIVE_STATIC_ASSERT((!constant_time_size));
       node_ptr to_remove(value_traits::to_node_ptr(value));
       node_algorithms::unlink(to_remove);
       BOOST_IF_CONSTEXPR(safemode_or_autounlink)
          node_algorithms::init(to_remove);
    }
 
    //! <b>Requires</b>: "source" container's Options can only can differ in the comparison
    //!   function from *this.
    //! 
    //! <b>Effects</b>: Attempts to extract each element in source and insert it into a using
    //!   the comparison object of *this. If there is an element in a with key equivalent to the
    //!   key of an element from source, then that element is not extracted from source.
    //! 
    //! <b>Postcondition</b>: Pointers and references to the transferred elements of source refer
    //!   to those same elements but as members of *this. Iterators referring to the transferred
    //!   elements will continue to refer to their elements, but they now behave as iterators into *this,
    //!   not into source.
    //!
    //! <b>Throws</b>: Nothing unless the comparison object throws.
    //!
    //! <b>Complexity</b>: N log(a.size() + N) (N has the value source.size())
    #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
    template<class T, class ...Options2> void merge_unique(bstree<T, Options2...> &);
    #else
    template<class Compare2>
    void merge_unique(bstree_impl
       <ValueTraits, VoidOrKeyOfValue, Compare2, SizeType, ConstantTimeSize, AlgoType, HeaderHolder> &source)
    #endif
    {
       node_ptr it   (node_algorithms::begin_node(source.header_ptr()))
              , itend(node_algorithms::end_node  (source.header_ptr()));
 
       while(it != itend){
          node_ptr const p(it);
          BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || !node_algorithms::unique(p));
          it = node_algorithms::next_node(it);
          if( node_algorithms::transfer_unique(this->header_ptr(), this->key_node_comp(this->key_comp()), source.header_ptr(), p) ){
             source.sz_traits().decrement();
             this->sz_traits().increment();
          }
       }
    }
 
    //! <b>Requires</b>: "source" container's Options can only can differ in the comparison
    //!   function from *this.
    //! 
    //! <b>Effects</b>: Extracts each element in source and insert it into a using
    //!   the comparison object of *this.
    //! 
    //! <b>Postcondition</b>: Pointers and references to the transferred elements of source refer
    //!   to those same elements but as members of *this. Iterators referring to the transferred
    //!   elements will continue to refer to their elements, but they now behave as iterators into *this,
    //!   not into source.
    //!
    //! <b>Throws</b>: Nothing unless the comparison object throws.
    //!
    //! <b>Complexity</b>: N log(a.size() + N) (N has the value source.size())
    #if defined(BOOST_INTRUSIVE_DOXYGEN_INVOKED)
    template<class T, class ...Options2> void merge_equal(bstree<T, Options2...> &);
    #else
    template<class Compare2>
    void merge_equal(bstree_impl
       <ValueTraits, VoidOrKeyOfValue, Compare2, SizeType, ConstantTimeSize, AlgoType, HeaderHolder> &source)
    #endif
    {
       node_ptr it   (node_algorithms::begin_node(source.header_ptr()))
              , itend(node_algorithms::end_node  (source.header_ptr()));
 
       while(it != itend){
          node_ptr const p(it);
          BOOST_INTRUSIVE_SAFE_HOOK_DEFAULT_ASSERT(!safemode_or_autounlink || !node_algorithms::unique(p));
          it = node_algorithms::next_node(it);
          node_algorithms::transfer_equal(this->header_ptr(), this->key_node_comp(this->key_comp()), source.header_ptr(), p);
          source.sz_traits().decrement();
          this->sz_traits().increment();
       }
    }
 
    //! <b>Effects</b>: Asserts the integrity of the container with additional checks provided by the user.
    //!
    //! <b>Complexity</b>: Linear time.
    //!
    //! <b>Note</b>: The method might not have effect when asserts are turned off (e.g., with NDEBUG).
    //!   Experimental function, interface might change in future versions.
    template <class ExtraChecker>
    void check(ExtraChecker extra_checker) const
    {
       typedef detail::key_nodeptr_comp<key_compare, value_traits, key_of_value> nodeptr_comp_t;
       nodeptr_comp_t nodeptr_comp(this->key_comp(), &this->get_value_traits());
       typedef typename get_node_checker<AlgoType, ValueTraits, nodeptr_comp_t, ExtraChecker>::type node_checker_t;
       typename node_checker_t::return_type checker_return;
       node_algorithms::check(this->header_ptr(), node_checker_t(nodeptr_comp, extra_checker), checker_return);
       BOOST_INTRUSIVE_INVARIANT_ASSERT(!constant_time_size || this->sz_traits().get_size() == checker_return.node_count);
    }
 
    //! <b>Effects</b>: Asserts the integrity of the container.
    //!
    //! <b>Complexity</b>: Linear time.
    //!
    //! <b>Note</b>: The method has no effect when asserts are turned off (e.g., with NDEBUG).
    //!   Experimental function, interface might change in future versions.
    void check() const
    {
       check(detail::empty_node_checker<ValueTraits>());
    }
 
    friend bool operator==(const bstree_impl &x, const bstree_impl &y)
    {
       if(constant_time_size && x.size() != y.size()){
          return false;
       }
       return boost::intrusive::algo_equal(x.cbegin(), x.cend(), y.cbegin(), y.cend());
    }
 
    friend bool operator!=(const bstree_impl &x, const bstree_impl &y)
    {  return !(x == y); }
 
    friend bool operator<(const bstree_impl &x, const bstree_impl &y)
    {  return ::boost::intrusive::algo_lexicographical_compare(x.begin(), x.end(), y.begin(), y.end());  }
 
    friend bool operator>(const bstree_impl &x, const bstree_impl &y)
    {  return y < x;  }
 
    friend bool operator<=(const bstree_impl &x, const bstree_impl &y)
    {  return !(x > y);  }
 
    friend bool operator>=(const bstree_impl &x, const bstree_impl &y)
    {  return !(x < y);  }
 
    friend void swap(bstree_impl &x, bstree_impl &y)
    {  x.swap(y);  }
 
    /// @cond
    private:
    template<class Disposer>
    iterator private_erase(const_iterator b, const_iterator e, size_type &n, Disposer disposer)
    {
       for(n = 0; b != e; ++n)
         this->erase_and_dispose(b++, disposer);
       return b.unconst();
    }
 
    iterator private_erase(const_iterator b, const_iterator e, size_type &n)
    {
       for(n = 0; b != e; ++n)
         this->erase(b++);
       return b.unconst();
    }
    /// @endcond
 };
 
 //! Helper metafunction to define a \c bstree 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>
 #endif
 struct make_bstree
 {
    /// @cond
    typedef typename pack_options
       < bstree_defaults,
       #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
       O1, O2, O3, O4, O5, O6
       #else
       Options...
       #endif
       >::type packed_options;
 
    typedef typename detail::get_value_traits
       <T, typename packed_options::proto_value_traits>::type value_traits;
 
    typedef bstree_impl
          < value_traits
          , typename packed_options::key_of_value
          , typename packed_options::compare
          , typename packed_options::size_type
          , packed_options::constant_time_size
          , BsTreeAlgorithms
          , typename packed_options::header_holder_type
          > implementation_defined;
    /// @endcond
    typedef implementation_defined type;
 };
 
 
 #ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
 
 #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
 template<class T, class O1, class O2, class O3, class O4, class O5, class O6>
 #else
 template<class T, class ...Options>
 #endif
 class bstree
    :  public make_bstree<T,
       #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
       O1, O2, O3, O4, O5, O6
       #else
       Options...
       #endif
       >::type
 {
    typedef typename make_bstree
       <T,
       #if !defined(BOOST_INTRUSIVE_VARIADIC_TEMPLATES)
       O1, O2, O3, O4, O5, O6
       #else
       Options...
       #endif
       >::type   Base;
    BOOST_MOVABLE_BUT_NOT_COPYABLE(bstree)
 
    public:
    typedef typename Base::key_compare        key_compare;
    typedef typename Base::value_traits       value_traits;
    typedef typename Base::iterator           iterator;
    typedef typename Base::const_iterator     const_iterator;
 
    //Assert if passed value traits are compatible with the type
    BOOST_INTRUSIVE_STATIC_ASSERT((detail::is_same<typename value_traits::value_type, T>::value));
 
    inline bstree()
       :  Base()
    {}
 
    inline explicit bstree( const key_compare &cmp, const value_traits &v_traits = value_traits())
       :  Base(cmp, v_traits)
    {}
 
    template<class Iterator>
    inline bstree( bool unique, Iterator b, Iterator e
          , const key_compare &cmp = key_compare()
          , const value_traits &v_traits = value_traits())
       :  Base(unique, b, e, cmp, v_traits)
    {}
 
    inline bstree(BOOST_RV_REF(bstree) x)
       :  Base(BOOST_MOVE_BASE(Base, x))
    {}
 
    inline bstree& operator=(BOOST_RV_REF(bstree) x)
    {  return static_cast<bstree &>(this->Base::operator=(BOOST_MOVE_BASE(Base, x)));  }
 
    template <class Cloner, class Disposer>
    inline void clone_from(const bstree &src, Cloner cloner, Disposer disposer)
    {  Base::clone_from(src, cloner, disposer);  }
 
    template <class Cloner, class Disposer>
    inline void clone_from(BOOST_RV_REF(bstree) src, Cloner cloner, Disposer disposer)
    {  Base::clone_from(BOOST_MOVE_BASE(Base, src), cloner, disposer);  }
 
    inline static bstree &container_from_end_iterator(iterator end_iterator) BOOST_NOEXCEPT
    {  return static_cast<bstree &>(Base::container_from_end_iterator(end_iterator));   }
 
    inline static const bstree &container_from_end_iterator(const_iterator end_iterator) BOOST_NOEXCEPT
    {  return static_cast<const bstree &>(Base::container_from_end_iterator(end_iterator));   }
 
    inline static bstree &container_from_iterator(iterator it) BOOST_NOEXCEPT
    {  return static_cast<bstree &>(Base::container_from_iterator(it));   }
 
    inline static const bstree &container_from_iterator(const_iterator it) BOOST_NOEXCEPT
    {  return static_cast<const bstree &>(Base::container_from_iterator(it));   }
 };
 
 #endif
 } //namespace intrusive
 } //namespace boost
 
 #include <boost/intrusive/detail/config_end.hpp>
 
 #endif //BOOST_INTRUSIVE_BSTREE_HPP

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