1 files changed, 749 insertions, 133 deletions
diff --git a/3rdParty/Boost/src/boost/unordered/detail/buckets.hpp b/3rdParty/Boost/src/boost/unordered/detail/buckets.hpp
index 913dbcd..def5c7c 100644
--- a/3rdParty/Boost/src/boost/unordered/detail/buckets.hpp
+++ b/3rdParty/Boost/src/boost/unordered/detail/buckets.hpp
@@ -1,183 +1,799 @@
 
 // Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
-// Copyright (C) 2005-2009 Daniel James
+// Copyright (C) 2005-2011 Daniel James
 // 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)
 
 #ifndef BOOST_UNORDERED_DETAIL_MANAGER_HPP_INCLUDED
 #define BOOST_UNORDERED_DETAIL_MANAGER_HPP_INCLUDED
 
-#include <boost/config.hpp>
-#include <boost/assert.hpp>
-#include <boost/unordered/detail/node.hpp>
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
 #include <boost/unordered/detail/util.hpp>
+#include <boost/unordered/detail/allocate.hpp>
+#include <boost/type_traits/aligned_storage.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#include <boost/swap.hpp>
+#include <boost/assert.hpp>
+#include <boost/limits.hpp>
+#include <boost/iterator.hpp>
+
+namespace boost { namespace unordered { namespace detail {
+
+    template <typename Types> struct table;
+    template <typename NodePointer> struct bucket;
+    struct ptr_bucket;
+    template <typename Types> struct table_impl;
+    template <typename Types> struct grouped_table_impl;
+
+}}}
+
+namespace boost { namespace unordered { namespace iterator_detail {
 
-namespace boost { namespace unordered_detail {
-    
     ////////////////////////////////////////////////////////////////////////////
-    // Buckets
-    
-    template <class A, class G>
-    inline std::size_t hash_buckets<A, G>::max_bucket_count() const {
-        // -1 to account for the sentinel.
-        return prev_prime(this->bucket_alloc().max_size() - 1);
-    }
+    // Iterators
+    //
+    // all no throw
 
-    template <class A, class G>
-    inline BOOST_DEDUCED_TYPENAME hash_buckets<A, G>::bucket_ptr
-        hash_buckets<A, G>::get_bucket(std::size_t num) const
+    template <typename NodePointer, typename Value> struct iterator;
+    template <typename ConstNodePointer, typename NodePointer,
+        typename Value> struct c_iterator;
+    template <typename NodePointer, typename Value, typename Policy>
+        struct l_iterator;
+    template <typename ConstNodePointer, typename NodePointer,
+        typename Value, typename Policy> struct cl_iterator;
+
+    // Local Iterators
+    //
+    // all no throw
+
+    template <typename NodePointer, typename Value, typename Policy>
+    struct l_iterator
+        : public boost::iterator<
+            std::forward_iterator_tag, Value, std::ptrdiff_t,
+            NodePointer, Value&>
     {
-        return buckets_ + static_cast<std::ptrdiff_t>(num);
-    }
+#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
+        template <typename ConstNodePointer, typename NodePointer2,
+                typename Value2, typename Policy2>
+        friend struct boost::unordered::iterator_detail::cl_iterator;
+    private:
+#endif
+        typedef NodePointer node_pointer;
+        typedef boost::unordered::iterator_detail::iterator<NodePointer, Value>
+            iterator;
+        node_pointer ptr_;
+        std::size_t bucket_;
+        std::size_t bucket_count_;
+
+    public:
+
+        l_iterator() : ptr_() {}
+
+        l_iterator(iterator x, std::size_t b, std::size_t c)
+            : ptr_(x.node_), bucket_(b), bucket_count_(c) {}
 
-    template <class A, class G>
-    inline BOOST_DEDUCED_TYPENAME hash_buckets<A, G>::bucket_ptr
-        hash_buckets<A, G>::bucket_ptr_from_hash(std::size_t hashed) const
+        Value& operator*() const {
+            return ptr_->value();
+        }
+
+        Value* operator->() const {
+            return ptr_->value_ptr();
+        }
+
+        l_iterator& operator++() {
+            ptr_ = static_cast<node_pointer>(ptr_->next_);
+            if (ptr_ && Policy::to_bucket(bucket_count_, ptr_->hash_)
+                    != bucket_)
+                ptr_ = node_pointer();
+            return *this;
+        }
+
+        l_iterator operator++(int) {
+            l_iterator tmp(*this);
+            ++(*this);
+            return tmp;
+        }
+
+        bool operator==(l_iterator x) const {
+            return ptr_ == x.ptr_;
+        }
+
+        bool operator!=(l_iterator x) const {
+            return ptr_ != x.ptr_;
+        }
+    };
+
+    template <typename ConstNodePointer, typename NodePointer, typename Value,
+             typename Policy>
+    struct cl_iterator
+        : public boost::iterator<
+            std::forward_iterator_tag, Value, std::ptrdiff_t,
+            ConstNodePointer, Value const&>
     {
-        return get_bucket(hashed % bucket_count_);
-    }
-    
-    template <class A, class G>
-    std::size_t hash_buckets<A, G>::bucket_size(std::size_t index) const
+        friend struct boost::unordered::iterator_detail::l_iterator
+            <NodePointer, Value, Policy>;
+    private:
+
+        typedef NodePointer node_pointer;
+        typedef boost::unordered::iterator_detail::iterator<NodePointer, Value>
+            iterator;
+        node_pointer ptr_;
+        std::size_t bucket_;
+        std::size_t bucket_count_;
+
+    public:
+
+        cl_iterator() : ptr_() {}
+
+        cl_iterator(iterator x, std::size_t b, std::size_t c) :
+            ptr_(x.node_), bucket_(b), bucket_count_(c) {}
+
+        cl_iterator(boost::unordered::iterator_detail::l_iterator<
+                NodePointer, Value, Policy> const& x) :
+            ptr_(x.ptr_), bucket_(x.bucket_), bucket_count_(x.bucket_count_)
+        {}
+
+        Value const&
+            operator*() const {
+            return ptr_->value();
+        }
+
+        Value const* operator->() const {
+            return ptr_->value_ptr();
+        }
+
+        cl_iterator& operator++() {
+            ptr_ = static_cast<node_pointer>(ptr_->next_);
+            if (ptr_ && Policy::to_bucket(bucket_count_, ptr_->hash_)
+                    != bucket_)
+                ptr_ = node_pointer();
+            return *this;
+        }
+
+        cl_iterator operator++(int) {
+            cl_iterator tmp(*this);
+            ++(*this);
+            return tmp;
+        }
+
+        friend bool operator==(cl_iterator const& x, cl_iterator const& y) {
+            return x.ptr_ == y.ptr_;
+        }
+
+        friend bool operator!=(cl_iterator const& x, cl_iterator const& y) {
+            return x.ptr_ != y.ptr_;
+        }
+    };
+
+    template <typename NodePointer, typename Value>
+    struct iterator
+        : public boost::iterator<
+            std::forward_iterator_tag, Value, std::ptrdiff_t,
+            NodePointer, Value&>
     {
-        if(!buckets_) return 0;
-        bucket_ptr ptr = get_bucket(index)->next_;
-        std::size_t count = 0;
-        while(ptr) {
-            ++count;
-            ptr = ptr->next_;
-        }
-        return count;
-    }
+#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
+        template <typename, typename, typename>
+        friend struct boost::unordered::iterator_detail::c_iterator;
+        template <typename, typename, typename>
+        friend struct boost::unordered::iterator_detail::l_iterator;
+        template <typename, typename, typename, typename>
+        friend struct boost::unordered::iterator_detail::cl_iterator;
+        template <typename>
+        friend struct boost::unordered::detail::table;
+        template <typename>
+        friend struct boost::unordered::detail::table_impl;
+        template <typename>
+        friend struct boost::unordered::detail::grouped_table_impl;
+    private:
+#endif
+        typedef NodePointer node_pointer;
+        node_pointer node_;
+
+    public:
 
-    template <class A, class G>
-    inline BOOST_DEDUCED_TYPENAME hash_buckets<A, G>::node_ptr
-        hash_buckets<A, G>::bucket_begin(std::size_t num) const
+        iterator() : node_() {}
+
+        explicit iterator(node_pointer const& x) : node_(x) {}
+
+        Value& operator*() const {
+            return node_->value();
+        }
+
+        Value* operator->() const {
+            return &node_->value();
+        }
+
+        iterator& operator++() {
+            node_ = static_cast<node_pointer>(node_->next_);
+            return *this;
+        }
+
+        iterator operator++(int) {
+            iterator tmp(node_);
+            node_ = static_cast<node_pointer>(node_->next_);
+            return tmp;
+        }
+
+        bool operator==(iterator const& x) const {
+            return node_ == x.node_;
+        }
+
+        bool operator!=(iterator const& x) const {
+            return node_ != x.node_;
+        }
+    };
+
+    template <typename ConstNodePointer, typename NodePointer, typename Value>
+    struct c_iterator
+        : public boost::iterator<
+            std::forward_iterator_tag, Value, std::ptrdiff_t,
+            ConstNodePointer, Value const&>
     {
-        return buckets_ ? get_bucket(num)->next_ : node_ptr();
-    }
+        friend struct boost::unordered::iterator_detail::iterator<
+                NodePointer, Value>;
 
-    ////////////////////////////////////////////////////////////////////////////
-    // Delete
+#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
+        template <typename>
+        friend struct boost::unordered::detail::table;
+        template <typename>
+        friend struct boost::unordered::detail::table_impl;
+        template <typename>
+        friend struct boost::unordered::detail::grouped_table_impl;
+
+    private:
+#endif
+
+        typedef NodePointer node_pointer;
+        typedef boost::unordered::iterator_detail::iterator<NodePointer, Value>
+            iterator;
+        node_pointer node_;
+
+    public:
+
+        c_iterator() : node_() {}
+
+        explicit c_iterator(node_pointer const& x) : node_(x) {}
+
+        c_iterator(boost::unordered::iterator_detail::iterator<
+                NodePointer, Value> const& x) : node_(x.node_) {}
+
+        Value const& operator*() const {
+            return node_->value();
+        }
+
+        Value const* operator->() const {
+            return &node_->value();
+        }
+
+        c_iterator& operator++() {
+            node_ = static_cast<node_pointer>(node_->next_);
+            return *this;
+        }
+
+        c_iterator operator++(int) {
+            c_iterator tmp(node_);
+            node_ = static_cast<node_pointer>(node_->next_);
+            return tmp;
+        }
+
+        friend bool operator==(c_iterator const& x, c_iterator const& y) {
+            return x.node_ == y.node_;
+        }
+
+        friend bool operator!=(c_iterator const& x, c_iterator const& y) {
+            return x.node_ != y.node_;
+        }
+    };
+}}}
+
+namespace boost { namespace unordered { namespace detail {
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Node construction
+
+    template <typename NodeAlloc>
+    struct node_constructor
+    {
+    private:
+
+        typedef NodeAlloc node_allocator;
+        typedef boost::unordered::detail::allocator_traits<NodeAlloc>
+            node_allocator_traits;
+        typedef typename node_allocator_traits::value_type node;
+        typedef typename node_allocator_traits::pointer node_pointer;
+        typedef typename node::value_type value_type;
+
+    protected:
+
+        node_allocator& alloc_;
+
+    private:
+
+        node_pointer node_;
+        bool node_constructed_;
+        bool value_constructed_;
+
+    public:
+
+        node_constructor(node_allocator& n) :
+            alloc_(n),
+            node_(),
+            node_constructed_(false),
+            value_constructed_(false)
+        {
+        }
+
+        ~node_constructor();
+
+        void construct();
+
+        template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
+        void construct_with_value(BOOST_UNORDERED_EMPLACE_ARGS)
+        {
+            construct();
+            boost::unordered::detail::construct_value_impl(
+                alloc_, node_->value_ptr(), BOOST_UNORDERED_EMPLACE_FORWARD);
+            value_constructed_ = true;
+        }
+
+        template <typename A0>
+        void construct_with_value2(BOOST_FWD_REF(A0) a0)
+        {
+            construct();
+            boost::unordered::detail::construct_value_impl(
+                alloc_, node_->value_ptr(),
+                BOOST_UNORDERED_EMPLACE_ARGS1(boost::forward<A0>(a0)));
+            value_constructed_ = true;
+        }
 
-    template <class A, class G>
-    inline void hash_buckets<A, G>::delete_node(node_ptr b)
+        value_type const& value() const {
+            BOOST_ASSERT(node_ && node_constructed_ && value_constructed_);
+            return node_->value();
+        }
+
+        // no throw
+        node_pointer release()
+        {
+            BOOST_ASSERT(node_ && node_constructed_);
+            node_pointer p = node_;
+            node_ = node_pointer();
+            return p;
+        }
+
+    private:
+        node_constructor(node_constructor const&);
+        node_constructor& operator=(node_constructor const&);
+    };
+
+    template <typename Alloc>
+    node_constructor<Alloc>::~node_constructor()
     {
-        node* raw_ptr = static_cast<node*>(&*b);
-        boost::unordered_detail::destroy(raw_ptr->value_ptr());
-        real_node_ptr n(node_alloc().address(*raw_ptr));
-        node_alloc().destroy(n);
-        node_alloc().deallocate(n, 1);
+        if (node_) {
+            if (value_constructed_) {
+                boost::unordered::detail::destroy_value_impl(alloc_,
+                    node_->value_ptr());
+            }
+
+            if (node_constructed_) {
+                node_allocator_traits::destroy(alloc_,
+                    boost::addressof(*node_));
+            }
+
+            node_allocator_traits::deallocate(alloc_, node_, 1);
+        }
     }
 
-    template <class A, class G>
-    inline void hash_buckets<A, G>::clear_bucket(bucket_ptr b)
+    template <typename Alloc>
+    void node_constructor<Alloc>::construct()
     {
-        node_ptr node_it = b->next_;
-        b->next_ = node_ptr();
+        if(!node_) {
+            node_constructed_ = false;
+            value_constructed_ = false;
+
+            node_ = node_allocator_traits::allocate(alloc_, 1);
+
+            node_allocator_traits::construct(alloc_,
+                boost::addressof(*node_), node());
+            node_->init(static_cast<typename node::link_pointer>(node_));
+            node_constructed_ = true;
+        }
+        else {
+            BOOST_ASSERT(node_constructed_);
 
-        while(node_it) {
-            node_ptr node_to_delete = node_it;
-            node_it = node_it->next_;
-            delete_node(node_to_delete);
+            if (value_constructed_)
+            {
+                boost::unordered::detail::destroy_value_impl(alloc_,
+                    node_->value_ptr());
+                value_constructed_ = false;
+            }
         }
     }
 
-    template <class A, class G>
-    inline void hash_buckets<A, G>::delete_buckets()
-    {      
-        bucket_ptr end = this->get_bucket(this->bucket_count_);
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Node Holder
+    //
+    // Temporary store for nodes. Deletes any that aren't used.
+
+    template <typename NodeAlloc>
+    struct node_holder : private node_constructor<NodeAlloc>
+    {
+    private:
+        typedef node_constructor<NodeAlloc> base;
+
+        typedef NodeAlloc node_allocator;
+        typedef boost::unordered::detail::allocator_traits<NodeAlloc>
+            node_allocator_traits;
+        typedef typename node_allocator_traits::value_type node;
+        typedef typename node_allocator_traits::pointer node_pointer;
+        typedef typename node::value_type value_type;
+        typedef typename node::link_pointer link_pointer;
+        typedef boost::unordered::iterator_detail::
+            iterator<node_pointer, value_type> iterator;
 
-        for(bucket_ptr begin = this->buckets_; begin != end; ++begin) {
-            clear_bucket(begin);
+        node_pointer nodes_;
+
+    public:
+
+        template <typename Table>
+        explicit node_holder(Table& b) :
+            base(b.node_alloc()),
+            nodes_()
+        {
+            if (b.size_) {
+                typename Table::previous_pointer prev = b.get_previous_start();
+                nodes_ = static_cast<node_pointer>(prev->next_);
+                prev->next_ = link_pointer();
+                b.size_ = 0;
+            }
         }
 
-        // Destroy the buckets (including the sentinel bucket).
-        ++end;
-        for(bucket_ptr begin = this->buckets_; begin != end; ++begin) {
-            bucket_alloc().destroy(begin);
+        ~node_holder();
+
+        template <typename T>
+        inline void assign_impl(T const& v) {
+            nodes_->value() = v;
         }
 
-        bucket_alloc().deallocate(this->buckets_, this->bucket_count_ + 1);
+        template <typename T1, typename T2>
+        inline void assign_impl(std::pair<T1 const, T2> const& v) {
+            const_cast<T1&>(nodes_->value().first) = v.first;
+            nodes_->value().second = v.second;
+        }
 
-        this->buckets_ = bucket_ptr();
-    }
+        template <typename T>
+        inline void move_assign_impl(T& v) {
+            nodes_->value() = boost::move(v);
+        }
 
-    template <class A, class G>
-    inline std::size_t hash_buckets<A, G>::delete_nodes(
-        node_ptr begin, node_ptr end)
+        template <typename T1, typename T2>
+        inline void move_assign_impl(std::pair<T1 const, T2>& v) {
+            // TODO: Move key as well?
+            const_cast<T1&>(nodes_->value().first) =
+                boost::move(const_cast<T1&>(v.first));
+            nodes_->value().second = boost::move(v.second);
+        }
+
+        node_pointer copy_of(value_type const& v)
+        {
+            if (nodes_) {
+                assign_impl(v);
+                node_pointer p = nodes_;
+                nodes_ = static_cast<node_pointer>(p->next_);
+                p->init(static_cast<typename node::link_pointer>(p));
+                p->next_ = link_pointer();
+                return p;
+            }
+            else {
+                this->construct_with_value2(v);
+                return base::release();
+            }
+        }
+
+        node_pointer move_copy_of(value_type& v)
+        {
+            if (nodes_) {
+                move_assign_impl(v);
+                node_pointer p = nodes_;
+                nodes_ = static_cast<node_pointer>(p->next_);
+                p->init(static_cast<typename node::link_pointer>(p));
+                p->next_ = link_pointer();
+                return p;
+            }
+            else {
+                this->construct_with_value2(boost::move(v));
+                return base::release();
+            }
+        }
+
+        iterator begin() const
+        {
+            return iterator(nodes_);
+        }
+    };
+
+    template <typename Alloc>
+    node_holder<Alloc>::~node_holder()
     {
-        std::size_t count = 0;
-        while(begin != end) {
-            node_ptr n = begin;
-            begin = begin->next_;
-            delete_node(n);
-            ++count;
-        }
-        return count;
+        while (nodes_) {
+            node_pointer p = nodes_;
+            nodes_ = static_cast<node_pointer>(p->next_);
+
+            boost::unordered::detail::destroy_value_impl(this->alloc_,
+                p->value_ptr());
+            node_allocator_traits::destroy(this->alloc_, boost::addressof(*p));
+            node_allocator_traits::deallocate(this->alloc_, p, 1);
+        }
     }
 
-    ////////////////////////////////////////////////////////////////////////////
-    // Constructors and Destructors
-
-    template <class A, class G>
-    inline hash_buckets<A, G>::hash_buckets(
-        node_allocator const& a, std::size_t bucket_count)
-      : buckets_(),
-        bucket_count_(bucket_count),
-        allocators_(a,a)
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Bucket
+
+    template <typename NodePointer>
+    struct bucket
     {
-    }
+        typedef NodePointer previous_pointer;
+        previous_pointer next_;
+
+        bucket() : next_() {}
 
-    template <class A, class G>
-    inline hash_buckets<A, G>::~hash_buckets()
+        previous_pointer first_from_start()
+        {
+            return next_;
+        }
+
+        enum { extra_node = true };
+    };
+
+    struct ptr_bucket
     {
-        if(this->buckets_) { this->delete_buckets(); }
-    }
-    
-    template <class A, class G>
-    inline void hash_buckets<A, G>::create_buckets()
+        typedef ptr_bucket* previous_pointer;
+        previous_pointer next_;
+
+        ptr_bucket() : next_(0) {}
+
+        previous_pointer first_from_start()
+        {
+            return this;
+        }
+
+        enum { extra_node = false };
+    };
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Hash Policy
+    //
+    // Don't really want table to derive from this, but will for now.
+
+    template <typename SizeT>
+    struct prime_policy
     {
-        // The array constructor will clean up in the event of an
-        // exception.
-        allocator_array_constructor<bucket_allocator>
-            constructor(bucket_alloc());
-
-        // Creates an extra bucket to act as a sentinel.
-        constructor.construct(bucket(), this->bucket_count_ + 1);
-
-        // Set up the sentinel (node_ptr cast)
-        bucket_ptr sentinel = constructor.get() +
-            static_cast<std::ptrdiff_t>(this->bucket_count_);
-        sentinel->next_ = sentinel;
-
-        // Only release the buckets once everything is successfully
-        // done.
-        this->buckets_ = constructor.release();
-    }
+        template <typename Hash, typename T>
+        static inline SizeT apply_hash(Hash const& hf, T const& x) {
+            return hf(x);
+        }
+
+        static inline SizeT to_bucket(SizeT bucket_count, SizeT hash) {
+            return hash % bucket_count;
+        }
+
+        static inline SizeT new_bucket_count(SizeT min) {
+            return boost::unordered::detail::next_prime(min);
+        }
+
+        static inline SizeT prev_bucket_count(SizeT max) {
+            return boost::unordered::detail::prev_prime(max);
+        }
+    };
+
+    template <typename SizeT>
+    struct mix64_policy
+    {
+        template <typename Hash, typename T>
+        static inline SizeT apply_hash(Hash const& hf, T const& x) {
+            SizeT key = hf(x);
+            key = (~key) + (key << 21); // key = (key << 21) - key - 1;
+            key = key ^ (key >> 24);
+            key = (key + (key << 3)) + (key << 8); // key * 265
+            key = key ^ (key >> 14);
+            key = (key + (key << 2)) + (key << 4); // key * 21
+            key = key ^ (key >> 28);
+            key = key + (key << 31);
+            return key;
+        }
+
+        static inline SizeT to_bucket(SizeT bucket_count, SizeT hash) {
+            return hash & (bucket_count - 1);
+        }
+
+        static inline SizeT new_bucket_count(SizeT min) {
+            if (min <= 4) return 4;
+            --min;
+            min |= min >> 1;
+            min |= min >> 2;
+            min |= min >> 4;
+            min |= min >> 8;
+            min |= min >> 16;
+            min |= min >> 32;
+            return min + 1;
+        }
+
+        static inline SizeT prev_bucket_count(SizeT max) {
+            max |= max >> 1;
+            max |= max >> 2;
+            max |= max >> 4;
+            max |= max >> 8;
+            max |= max >> 16;
+            max |= max >> 32;
+            return (max >> 1) + 1;
+        }
+    };
+
+    template <int digits, int radix>
+    struct pick_policy_impl {
+        typedef prime_policy<std::size_t> type;
+    };
+
+    template <>
+    struct pick_policy_impl<64, 2> {
+        typedef mix64_policy<std::size_t> type;
+    };
+
+    struct pick_policy :
+        pick_policy_impl<
+            std::numeric_limits<std::size_t>::digits,
+            std::numeric_limits<std::size_t>::radix> {};
 
     ////////////////////////////////////////////////////////////////////////////
-    // Constructors and Destructors
+    // Functions
+
+    // Assigning and swapping the equality and hash function objects
+    // needs strong exception safety. To implement that normally we'd
+    // require one of them to be known to not throw and the other to
+    // guarantee strong exception safety. Unfortunately they both only
+    // have basic exception safety. So to acheive strong exception
+    // safety we have storage space for two copies, and assign the new
+    // copies to the unused space. Then switch to using that to use
+    // them. This is implemented in 'set_hash_functions' which
+    // atomically assigns the new function objects in a strongly
+    // exception safe manner.
+
+    template <class H, class P> class set_hash_functions;
 
-    // no throw
-    template <class A, class G>
-    inline void hash_buckets<A, G>::move(hash_buckets& other)
+    template <class H, class P>
+    class functions
     {
-        BOOST_ASSERT(node_alloc() == other.node_alloc());
-        if(this->buckets_) { this->delete_buckets(); }
-        this->buckets_ = other.buckets_;
-        this->bucket_count_ = other.bucket_count_;
-        other.buckets_ = bucket_ptr();
-        other.bucket_count_ = 0;
-    }
+        friend class boost::unordered::detail::set_hash_functions<H, P>;
+        functions& operator=(functions const&);
+
+        typedef compressed<H, P> function_pair;
+
+        typedef typename boost::aligned_storage<
+            sizeof(function_pair),
+            boost::alignment_of<function_pair>::value>::type aligned_function;
+
+        bool current_; // The currently active functions.
+        aligned_function funcs_[2];
+
+        function_pair const& current() const {
+            return *static_cast<function_pair const*>(
+                static_cast<void const*>(&funcs_[current_]));
+        }
+
+        void construct(bool which, H const& hf, P const& eq)
+        {
+            new((void*) &funcs_[which]) function_pair(hf, eq);
+        }
+
+        void construct(bool which, function_pair const& f)
+        {
+            new((void*) &funcs_[which]) function_pair(f);
+        }
+        
+        void destroy(bool which)
+        {
+            boost::unordered::detail::destroy((function_pair*)(&funcs_[which]));
+        }
+        
+    public:
+
+        functions(H const& hf, P const& eq)
+            : current_(false)
+        {
+            construct(current_, hf, eq);
+        }
 
-    template <class A, class G>
-    inline void hash_buckets<A, G>::swap(hash_buckets<A, G>& other)
+        functions(functions const& bf)
+            : current_(false)
+        {
+            construct(current_, bf.current());
+        }
+
+        ~functions() {
+            this->destroy(current_);
+        }
+
+        H const& hash_function() const {
+            return current().first();
+        }
+
+        P const& key_eq() const {
+            return current().second();
+        }
+    };
+    
+    template <class H, class P>
+    class set_hash_functions
     {
-        BOOST_ASSERT(node_alloc() == other.node_alloc());
-        std::swap(buckets_, other.buckets_);
-        std::swap(bucket_count_, other.bucket_count_);
-    }
-}}
+        set_hash_functions(set_hash_functions const&);
+        set_hash_functions& operator=(set_hash_functions const&);
+    
+        functions<H,P>& functions_;
+        bool tmp_functions_;
+
+    public:
+
+        set_hash_functions(functions<H,P>& f, H const& h, P const& p)
+          : functions_(f),
+            tmp_functions_(!f.current_)
+        {
+            f.construct(tmp_functions_, h, p);
+        }
+
+        set_hash_functions(functions<H,P>& f, functions<H,P> const& other)
+          : functions_(f),
+            tmp_functions_(!f.current_)
+        {
+            f.construct(tmp_functions_, other.current());
+        }
+
+        ~set_hash_functions()
+        {
+            functions_.destroy(tmp_functions_);
+        }
+
+        void commit()
+        {
+            functions_.current_ = tmp_functions_;
+            tmp_functions_ = !tmp_functions_;
+        }
+    };
+
+    ////////////////////////////////////////////////////////////////////////////
+    // rvalue parameters when type can't be a BOOST_RV_REF(T) parameter
+    // e.g. for int
+
+#if !defined(BOOST_NO_RVALUE_REFERENCES)
+#   define BOOST_UNORDERED_RV_REF(T) BOOST_RV_REF(T)
+#else
+    struct please_ignore_this_overload {
+        typedef please_ignore_this_overload type;
+    };
+
+    template <typename T>
+    struct rv_ref_impl {
+        typedef BOOST_RV_REF(T) type;
+    };
+
+    template <typename T>
+    struct rv_ref :
+        boost::detail::if_true<
+            boost::is_class<T>::value
+        >::BOOST_NESTED_TEMPLATE then <
+            boost::unordered::detail::rv_ref_impl<T>,
+            please_ignore_this_overload
+        >::type
+    {};
+
+#   define BOOST_UNORDERED_RV_REF(T) \
+        typename boost::unordered::detail::rv_ref<T>::type
+#endif
+}}}
 
 #endif