Added boost header

test/external/boost/unordered/detail/buckets.hpp

@@ -0,0 +1,667 @@
+
+// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
+// 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
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/unordered/detail/util.hpp>
+#include <boost/unordered/detail/allocator_helpers.hpp>
+#include <boost/unordered/detail/emplace_args.hpp>
+#include <boost/type_traits/aligned_storage.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#include <boost/swap.hpp>
+#include <boost/assert.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable:4127) // conditional expression is constant
+#endif
+
+namespace boost { namespace unordered { namespace detail {
+
+    template <typename Types> struct table;
+    template <typename NodePointer> struct bucket;
+    struct ptr_bucket;
+    template <typename A, typename Bucket, typename Node> struct buckets;
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // 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;
+
+        node_allocator& alloc_;
+        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_node();
+
+        template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
+        void construct_value(BOOST_UNORDERED_EMPLACE_ARGS)
+        {
+            BOOST_ASSERT(node_ && node_constructed_ && !value_constructed_);
+            boost::unordered::detail::construct_impl(
+                node_->value_ptr(), BOOST_UNORDERED_EMPLACE_FORWARD);
+            value_constructed_ = true;
+        }
+
+        template <typename A0>
+        void construct_value2(BOOST_FWD_REF(A0) a0)
+        {
+            BOOST_ASSERT(node_ && node_constructed_ && !value_constructed_);
+            boost::unordered::detail::construct_impl2(
+                node_->value_ptr(), boost::forward<A0>(a0));
+            value_constructed_ = true;
+        }
+
+        value_type const& value() const {
+            BOOST_ASSERT(node_ && node_constructed_ && value_constructed_);
+            return node_->value();
+        }
+
+        // no throw
+        node_pointer release()
+        {
+            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()
+    {
+        if (node_) {
+            if (value_constructed_) {
+                boost::unordered::detail::destroy(node_->value_ptr());
+            }
+
+            if (node_constructed_) {
+                node_allocator_traits::destroy(alloc_,
+                    boost::addressof(*node_));
+            }
+
+            node_allocator_traits::deallocate(alloc_, node_, 1);
+        }
+    }
+
+    template <typename Alloc>
+    void node_constructor<Alloc>::construct_node()
+    {
+        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_);
+
+            if (value_constructed_)
+            {
+                boost::unordered::detail::destroy(node_->value_ptr());
+                value_constructed_ = false;
+            }
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Bucket
+
+    template <typename NodePointer>
+    struct bucket
+    {
+        typedef NodePointer previous_pointer;
+        previous_pointer next_;
+
+        bucket() : next_() {}
+
+        previous_pointer first_from_start()
+        {
+            return next_;
+        }
+
+        enum { extra_node = true };
+    };
+
+    struct ptr_bucket
+    {
+        typedef ptr_bucket* previous_pointer;
+        previous_pointer next_;
+
+        ptr_bucket() : next_(0) {}
+
+        previous_pointer first_from_start()
+        {
+            return this;
+        }
+
+        enum { extra_node = false };
+    };
+
+    ///////////////////////////////////////////////////////////////////
+    //
+    // Buckets
+
+    template <typename A, typename Bucket, typename Node>
+    struct buckets
+    {
+    private:
+        buckets(buckets const&);
+        buckets& operator=(buckets const&);
+    public:
+        typedef boost::unordered::detail::allocator_traits<A> traits;
+        typedef typename traits::value_type value_type;
+
+        typedef Node node;
+        typedef Bucket bucket;
+        typedef typename boost::unordered::detail::rebind_wrap<A, node>::type
+            node_allocator;
+        typedef typename boost::unordered::detail::rebind_wrap<A, bucket>::type
+            bucket_allocator;
+        typedef boost::unordered::detail::allocator_traits<node_allocator>
+            node_allocator_traits;
+        typedef boost::unordered::detail::allocator_traits<bucket_allocator>
+            bucket_allocator_traits;
+        typedef typename node_allocator_traits::pointer
+            node_pointer;
+        typedef typename node_allocator_traits::const_pointer
+            const_node_pointer;
+        typedef typename bucket_allocator_traits::pointer
+            bucket_pointer;
+        typedef typename bucket::previous_pointer
+            previous_pointer;
+        typedef boost::unordered::detail::node_constructor<node_allocator>
+            node_constructor;
+
+        // Members
+
+        bucket_pointer buckets_;
+        std::size_t bucket_count_;
+        std::size_t size_;
+        boost::unordered::detail::compressed<bucket_allocator, node_allocator>
+            allocators_;
+
+        // Data access
+
+        bucket_allocator const& bucket_alloc() const
+        {
+            return allocators_.first();
+        }
+
+        node_allocator const& node_alloc() const
+        {
+            return allocators_.second();
+        }
+
+        bucket_allocator& bucket_alloc()
+        {
+            return allocators_.first();
+        }
+
+        node_allocator& node_alloc()
+        {
+            return allocators_.second();
+        }
+
+        std::size_t max_bucket_count() const
+        {
+            // -1 to account for the start bucket.
+            return boost::unordered::detail::prev_prime(
+                bucket_allocator_traits::max_size(bucket_alloc()) - 1);
+        }
+
+        bucket_pointer get_bucket(std::size_t bucket_index) const
+        {
+            return buckets_ + static_cast<std::ptrdiff_t>(bucket_index);
+        }
+
+        previous_pointer get_previous_start() const
+        {
+            return this->get_bucket(this->bucket_count_)->first_from_start();
+        }
+
+        previous_pointer get_previous_start(std::size_t bucket_index) const
+        {
+            return this->get_bucket(bucket_index)->next_;
+        }
+
+        node_pointer get_start() const
+        {
+            return static_cast<node_pointer>(this->get_previous_start()->next_);
+        }
+
+        node_pointer get_start(std::size_t bucket_index) const
+        {
+            previous_pointer prev = this->get_previous_start(bucket_index);
+            return prev ? static_cast<node_pointer>(prev->next_) :
+                node_pointer();
+        }
+
+        float load_factor() const
+        {
+            BOOST_ASSERT(this->bucket_count_ != 0);
+            return static_cast<float>(this->size_)
+                / static_cast<float>(this->bucket_count_);
+        }
+
+        std::size_t bucket_size(std::size_t index) const
+        {
+            if (!this->size_) return 0;
+            node_pointer ptr = this->get_start(index);
+            if (!ptr) return 0;
+
+            std::size_t count = 0;
+            while(ptr && ptr->hash_ % this->bucket_count_ == index)
+            {
+                ++count;
+                ptr = static_cast<node_pointer>(ptr->next_);
+            }
+
+            return count;
+        }
+
+        ////////////////////////////////////////////////////////////////////////
+        // Constructors
+
+        buckets(node_allocator const& a, std::size_t bucket_count) :
+            buckets_(),
+            bucket_count_(bucket_count),
+            size_(),
+            allocators_(a,a)
+        {
+        }
+
+        buckets(buckets& b, boost::unordered::detail::move_tag m) :
+            buckets_(),
+            bucket_count_(b.bucket_count_),
+            size_(),
+            allocators_(b.allocators_, m)
+        {
+            swap(b);
+        }
+
+        template <typename Types>
+        buckets(boost::unordered::detail::table<Types>& x,
+                boost::unordered::detail::move_tag m) :
+            buckets_(),
+            bucket_count_(x.bucket_count_),
+            size_(),
+            allocators_(x.allocators_, m)
+        {
+            swap(x);
+        }
+
+        ////////////////////////////////////////////////////////////////////////
+        // Create buckets
+        // (never called in constructor to avoid exception issues)
+
+        void create_buckets()
+        {
+            boost::unordered::detail::array_constructor<bucket_allocator>
+                constructor(bucket_alloc());
+    
+            // Creates an extra bucket to act as the start node.
+            constructor.construct(bucket(), this->bucket_count_ + 1);
+    
+            if (bucket::extra_node)
+            {
+                node_constructor a(this->node_alloc());
+                a.construct_node();
+
+                (constructor.get() +
+                    static_cast<std::ptrdiff_t>(this->bucket_count_))->next_ =
+                        a.release();
+            }
+
+            this->buckets_ = constructor.release();
+        }
+
+        ////////////////////////////////////////////////////////////////////////
+        // Swap and Move
+
+        void swap(buckets& other, false_type = false_type())
+        {
+            BOOST_ASSERT(node_alloc() == other.node_alloc());
+            boost::swap(buckets_, other.buckets_);
+            boost::swap(bucket_count_, other.bucket_count_);
+            boost::swap(size_, other.size_);
+        }
+
+        void swap(buckets& other, true_type)
+        {
+            allocators_.swap(other.allocators_);
+            boost::swap(buckets_, other.buckets_);
+            boost::swap(bucket_count_, other.bucket_count_);
+            boost::swap(size_, other.size_);
+        }
+
+        void move_buckets_from(buckets& other)
+        {
+            BOOST_ASSERT(node_alloc() == other.node_alloc());
+            BOOST_ASSERT(!this->buckets_);
+            this->buckets_ = other.buckets_;
+            this->bucket_count_ = other.bucket_count_;
+            this->size_ = other.size_;
+            other.buckets_ = bucket_pointer();
+            other.bucket_count_ = 0;
+            other.size_ = 0;
+        }
+
+        ////////////////////////////////////////////////////////////////////////
+        // Delete/destruct
+
+        inline void delete_node(node_pointer n)
+        {
+            boost::unordered::detail::destroy(n->value_ptr());
+            node_allocator_traits::destroy(node_alloc(), boost::addressof(*n));
+            node_allocator_traits::deallocate(node_alloc(), n, 1);
+            --size_;
+        }
+
+        std::size_t delete_nodes(node_pointer begin, node_pointer end)
+        {
+            std::size_t count = 0;
+
+            while(begin != end) {
+                node_pointer n = begin;
+                begin = static_cast<node_pointer>(begin->next_);
+                delete_node(n);
+                ++count;
+            }
+
+            return count;
+        }
+
+        inline void delete_extra_node(bucket_pointer) {}
+
+        inline void delete_extra_node(node_pointer n) {
+            node_allocator_traits::destroy(node_alloc(), boost::addressof(*n));
+            node_allocator_traits::deallocate(node_alloc(), n, 1);
+        }
+
+        inline ~buckets()
+        {
+            this->delete_buckets();
+        }
+
+        void delete_buckets()
+        {
+            if(this->buckets_) {
+                previous_pointer prev = this->get_previous_start();
+
+                while(prev->next_) {
+                    node_pointer n = static_cast<node_pointer>(prev->next_);
+                    prev->next_ = n->next_;
+                    delete_node(n);
+                }
+
+                delete_extra_node(prev);
+
+                bucket_pointer end = this->get_bucket(this->bucket_count_ + 1);
+                for(bucket_pointer it = this->buckets_; it != end; ++it)
+                {
+                    bucket_allocator_traits::destroy(bucket_alloc(),
+                        boost::addressof(*it));
+                }
+
+                bucket_allocator_traits::deallocate(bucket_alloc(),
+                    this->buckets_, this->bucket_count_ + 1);
+    
+                this->buckets_ = bucket_pointer();
+            }
+
+            BOOST_ASSERT(!this->size_);
+        }
+
+        void clear()
+        {
+            if(!this->size_) return;
+
+            previous_pointer prev = this->get_previous_start();
+
+            while(prev->next_) {
+                node_pointer n = static_cast<node_pointer>(prev->next_);
+                prev->next_ = n->next_;
+                delete_node(n);
+            }
+
+            bucket_pointer end = this->get_bucket(this->bucket_count_);
+            for(bucket_pointer it = this->buckets_; it != end; ++it)
+            {
+                it->next_ = node_pointer();
+            }
+
+            BOOST_ASSERT(!this->size_);
+        }
+
+        // This is called after erasing a node or group of nodes to fix up
+        // the bucket pointers.
+        void fix_buckets(bucket_pointer bucket,
+                previous_pointer prev, node_pointer next)
+        {
+            if (!next)
+            {
+                if (bucket->next_ == prev) bucket->next_ = node_pointer();
+            }
+            else
+            {
+                bucket_pointer next_bucket = this->get_bucket(
+                    next->hash_ % this->bucket_count_);
+
+                if (next_bucket != bucket)
+                {
+                    next_bucket->next_ = prev;
+                    if (bucket->next_ == prev) bucket->next_ = node_pointer();
+                }
+            }
+        }
+
+        // This is called after erasing a range of nodes to fix any bucket
+        // pointers into that range.
+        void fix_buckets_range(std::size_t bucket_index,
+                previous_pointer prev, node_pointer begin, node_pointer end)
+        {
+            node_pointer n = begin;
+    
+            // If we're not at the start of the current bucket, then
+            // go to the start of the next bucket.
+            if (this->get_bucket(bucket_index)->next_ != prev)
+            {
+                for(;;) {
+                    n = static_cast<node_pointer>(n->next_);
+                    if (n == end) return;
+    
+                    std::size_t new_bucket_index =
+                        n->hash_ % this->bucket_count_;
+                    if (bucket_index != new_bucket_index) {
+                        bucket_index = new_bucket_index;
+                        break;
+                    }
+                }
+            }
+    
+            // Iterate through the remaining nodes, clearing out the bucket
+            // pointers.
+            this->get_bucket(bucket_index)->next_ = previous_pointer();
+            for(;;) {
+                n = static_cast<node_pointer>(n->next_);
+                if (n == end) break;
+    
+                std::size_t new_bucket_index =
+                    n->hash_ % this->bucket_count_;
+                if (bucket_index != new_bucket_index) {
+                    bucket_index = new_bucket_index;
+                    this->get_bucket(bucket_index)->next_ = previous_pointer();
+                }
+            };
+    
+            // Finally fix the bucket containing the trailing node.
+            if (n) {
+                this->get_bucket(n->hash_ % this->bucket_count_)->next_
+                    = prev;
+            }
+        }
+    };
+
+    ////////////////////////////////////////////////////////////////////////////
+    // 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;
+
+    template <class H, class P>
+    class functions
+    {
+        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);
+        }
+
+        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
+    {
+        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_;
+        }
+    };
+}}}
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+
+#endif