forked from boostorg/unordered
		
	- Always construct iterator in detail for consistency. - Move 0-argument emplace to start of overloads. [SVN r75744]
		
			
				
	
	
		
			830 lines
		
	
	
		
			28 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			830 lines
		
	
	
		
			28 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| 
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| // Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
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| // Copyright (C) 2005-2011 Daniel James
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| // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 
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| #ifndef BOOST_UNORDERED_DETAIL_EQUIVALENT_HPP_INCLUDED
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| #define BOOST_UNORDERED_DETAIL_EQUIVALENT_HPP_INCLUDED
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| 
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| #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| # pragma once
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| #endif
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| 
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| #include <boost/unordered/detail/table.hpp>
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| #include <boost/unordered/detail/emplace_args.hpp>
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| #include <boost/unordered/detail/extract_key.hpp>
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| 
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| namespace boost { namespace unordered { namespace detail {
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| 
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|     template <typename A, typename T> struct grouped_node;
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|     template <typename T> struct grouped_ptr_node;
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|     template <typename Types> struct grouped_table_impl;
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| 
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|     template <typename A, typename T>
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|     struct grouped_node :
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|         boost::unordered::detail::value_base<T>
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|     {
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|         typedef typename ::boost::unordered::detail::rebind_wrap<
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|             A, grouped_node<A, T> >::type::pointer link_pointer;
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| 
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|         link_pointer next_;
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|         link_pointer group_prev_;
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|         std::size_t hash_;
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| 
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|         grouped_node() :
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|             next_(),
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|             group_prev_(),
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|             hash_(0)
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|         {}
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| 
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|         void init(link_pointer self)
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|         {
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|             group_prev_ = self;
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|         }
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|     };
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| 
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|     template <typename T>
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|     struct grouped_ptr_node :
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|         boost::unordered::detail::value_base<T>,
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|         boost::unordered::detail::ptr_bucket
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|     {
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|         typedef boost::unordered::detail::ptr_bucket bucket_base;
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|         typedef ptr_bucket* link_pointer;
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| 
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|         link_pointer group_prev_;
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|         std::size_t hash_;
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| 
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|         grouped_ptr_node() :
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|             bucket_base(),
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|             group_prev_(0),
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|             hash_(0)
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|         {}
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| 
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|         void init(link_pointer self)
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|         {
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|             group_prev_ = self;
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|         }
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|     };
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| 
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|     // If the allocator uses raw pointers use grouped_ptr_node
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|     // Otherwise use grouped_node.
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| 
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|     template <typename A, typename T, typename NodePtr, typename BucketPtr>
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|     struct pick_grouped_node2
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|     {
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|         typedef boost::unordered::detail::grouped_node<A, T> node;
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| 
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|         typedef typename boost::unordered::detail::allocator_traits<
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|             typename boost::unordered::detail::rebind_wrap<A, node>::type
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|         >::pointer node_pointer;
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| 
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|         typedef boost::unordered::detail::bucket<node_pointer> bucket;
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|         typedef node_pointer link_pointer;
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|     };
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| 
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|     template <typename A, typename T>
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|     struct pick_grouped_node2<A, T,
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|         boost::unordered::detail::grouped_ptr_node<T>*,
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|         boost::unordered::detail::ptr_bucket*>
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|     {
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|         typedef boost::unordered::detail::grouped_ptr_node<T> node;
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|         typedef boost::unordered::detail::ptr_bucket bucket;
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|         typedef bucket* link_pointer;
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|     };
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| 
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|     template <typename A, typename T>
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|     struct pick_grouped_node
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|     {
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|         typedef boost::unordered::detail::allocator_traits<
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|             typename boost::unordered::detail::rebind_wrap<A,
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|                 boost::unordered::detail::grouped_ptr_node<T> >::type
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|         > tentative_node_traits;
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| 
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|         typedef boost::unordered::detail::allocator_traits<
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|             typename boost::unordered::detail::rebind_wrap<A,
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|                 boost::unordered::detail::ptr_bucket >::type
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|         > tentative_bucket_traits;
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| 
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|         typedef pick_grouped_node2<A, T,
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|             typename tentative_node_traits::pointer,
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|             typename tentative_bucket_traits::pointer> pick;
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| 
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|         typedef typename pick::node node;
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|         typedef typename pick::bucket bucket;
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|         typedef typename pick::link_pointer link_pointer;
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|     };
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| 
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|     template <typename A, typename T, typename H, typename P>
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|     struct multiset
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|     {
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|         typedef boost::unordered::detail::multiset<A, T, H, P> types;
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| 
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|         typedef T value_type;
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|         typedef H hasher;
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|         typedef P key_equal;
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|         typedef T key_type;
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| 
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|         typedef typename boost::unordered::detail::rebind_wrap<
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|                 A, value_type>::type allocator;
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| 
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|         typedef boost::unordered::detail::allocator_traits<allocator> traits;
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|         typedef boost::unordered::detail::pick_grouped_node<allocator, value_type> pick;
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|         typedef typename pick::node node;
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|         typedef typename pick::bucket bucket;
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|         typedef typename pick::link_pointer link_pointer;
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| 
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|         typedef boost::unordered::detail::grouped_table_impl<types> table;
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|         typedef boost::unordered::detail::set_extractor<value_type> extractor;
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|     };
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| 
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|     template <typename A, typename K, typename M, typename H, typename P>
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|     struct multimap
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|     {
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|         typedef boost::unordered::detail::multimap<A, K, M, H, P> types;
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| 
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|         typedef std::pair<K const, M> value_type;
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|         typedef H hasher;
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|         typedef P key_equal;
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|         typedef K key_type;
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| 
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|         typedef typename boost::unordered::detail::rebind_wrap<
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|                 A, value_type>::type allocator;
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| 
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|         typedef boost::unordered::detail::allocator_traits<allocator> traits;
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|         typedef boost::unordered::detail::pick_grouped_node<allocator, value_type> pick;
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|         typedef typename pick::node node;
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|         typedef typename pick::bucket bucket;
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|         typedef typename pick::link_pointer link_pointer;
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| 
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|         typedef boost::unordered::detail::grouped_table_impl<types> table;
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|         typedef boost::unordered::detail::map_extractor<key_type, value_type>
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|             extractor;
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|     };
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| 
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|     template <typename Types>
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|     struct grouped_table_impl : boost::unordered::detail::table<Types>
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|     {
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|         typedef boost::unordered::detail::table<Types> table;
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|         typedef typename table::value_type value_type;
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|         typedef typename table::bucket bucket;
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|         typedef typename table::buckets buckets;
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|         typedef typename table::node_pointer node_pointer;
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|         typedef typename table::node_allocator node_allocator;
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|         typedef typename table::node_allocator_traits node_allocator_traits;
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|         typedef typename table::bucket_pointer bucket_pointer;
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|         typedef typename table::link_pointer link_pointer;
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|         typedef typename table::previous_pointer previous_pointer;
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|         typedef typename table::hasher hasher;
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|         typedef typename table::key_equal key_equal;
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|         typedef typename table::key_type key_type;
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|         typedef typename table::node_constructor node_constructor;
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|         typedef typename table::extractor extractor;
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|         typedef typename table::iterator iterator;
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| 
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|         // Constructors
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| 
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|         grouped_table_impl(std::size_t n,
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|                 hasher const& hf,
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|                 key_equal const& eq,
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|                 node_allocator const& a)
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|           : table(n, hf, eq, a)
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|         {}
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| 
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|         grouped_table_impl(grouped_table_impl const& x)
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|           : table(x, node_allocator_traits::
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|                 select_on_container_copy_construction(x.node_alloc())) {}
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| 
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|         grouped_table_impl(grouped_table_impl const& x,
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|                 node_allocator const& a)
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|           : table(x, a)
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|         {}
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| 
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|         grouped_table_impl(grouped_table_impl& x,
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|                 boost::unordered::detail::move_tag m)
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|           : table(x, m)
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|         {}
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| 
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|         grouped_table_impl(grouped_table_impl& x,
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|                 node_allocator const& a,
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|                 boost::unordered::detail::move_tag m)
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|           : table(x, a, m)
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|         {}
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| 
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|         // Accessors
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| 
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|         template <class Key, class Pred>
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|         node_pointer find_node_impl(
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|                 std::size_t hash,
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|                 Key const& k,
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|                 Pred const& eq) const
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|         {
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|             std::size_t bucket_index = hash % this->bucket_count_;
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|             node_pointer n = this->get_start(bucket_index);
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| 
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|             for (;;)
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|             {
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|                 if (!n) return n;
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| 
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|                 std::size_t node_hash = n->hash_;
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|                 if (hash == node_hash)
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|                 {
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|                     if (eq(k, this->get_key(n->value())))
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|                         return n;
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|                 }
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|                 else
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|                 {
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|                     if (node_hash % this->bucket_count_ != bucket_index)
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|                         return node_pointer();
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|                 }
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| 
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|                 n = static_cast<node_pointer>(
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|                     static_cast<node_pointer>(n->group_prev_)->next_);
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|             }
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|         }
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| 
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|         std::size_t count(key_type const& k) const
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|         {
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|             node_pointer n = this->find_node(k);
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|             if (!n) return 0;
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| 
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|             std::size_t count = 0;
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|             node_pointer it = n;
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|             do {
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|                 it = static_cast<node_pointer>(it->group_prev_);
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|                 ++count;
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|             } while(it != n);
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| 
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|             return count;
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|         }
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| 
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|         std::pair<iterator, iterator>
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|             equal_range(key_type const& k) const
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|         {
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|             node_pointer n = this->find_node(k);
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|             return std::make_pair(
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|                 iterator(n), iterator(n ?
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|                     static_cast<node_pointer>(
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|                         static_cast<node_pointer>(n->group_prev_)->next_) :
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|                     n));
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|         }
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| 
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|         // Equality
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| 
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|         bool equals(grouped_table_impl const& other) const
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|         {
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|             if(this->size_ != other.size_) return false;
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|             if(!this->size_) return true;
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|     
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|             for(node_pointer n1 = this->get_start(); n1;)
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|             {
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|                 node_pointer n2 = other.find_matching_node(n1);
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|                 if (!n2) return false;
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|                 node_pointer end1 = static_cast<node_pointer>(
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|                     static_cast<node_pointer>(n1->group_prev_)->next_);
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|                 node_pointer end2 = static_cast<node_pointer>(
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|                     static_cast<node_pointer>(n2->group_prev_)->next_);
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|                 if (!group_equals(n1, end1, n2, end2)) return false;
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|                 n1 = end1;    
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|             }
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|     
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|             return true;
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|         }
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| 
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| #if !defined(BOOST_UNORDERED_DEPRECATED_EQUALITY)
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| 
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|         static bool group_equals(node_pointer n1, node_pointer end1,
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|                 node_pointer n2, node_pointer end2)
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|         {
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|             for(;;)
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|             {
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|                 if (n1->value() != n2->value())
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|                     break;
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| 
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|                 n1 = static_cast<node_pointer>(n1->next_);
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|                 n2 = static_cast<node_pointer>(n2->next_);
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|             
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|                 if (n1 == end1) return n2 == end2;
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|                 if (n2 == end2) return false;
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|             }
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|             
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|             for(node_pointer n1a = n1, n2a = n2;;)
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|             {
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|                 n1a = static_cast<node_pointer>(n1a->next_);
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|                 n2a = static_cast<node_pointer>(n2a->next_);
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| 
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|                 if (n1a == end1)
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|                 {
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|                     if (n2a == end2) break;
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|                     else return false;
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|                 }
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| 
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|                 if (n2a == end2) return false;
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|             }
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| 
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|             node_pointer start = n1;
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|             for(;n1 != end2; n1 = static_cast<node_pointer>(n1->next_))
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|             {
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|                 value_type const& v = n1->value();
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|                 if (find(start, n1, v)) continue;
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|                 std::size_t matches = count_equal(n2, end2, v);
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|                 if (!matches || matches != 1 + count_equal(
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|                         static_cast<node_pointer>(n1->next_), end1, v))
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|                     return false;
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|             }
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|             
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|             return true;
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|         }
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| 
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|         static bool find(node_pointer n, node_pointer end, value_type const& v)
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|         {
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|             for(;n != end; n = static_cast<node_pointer>(n->next_))
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|                 if (n->value() == v)
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|                     return true;
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|             return false;
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|         }
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| 
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|         static std::size_t count_equal(node_pointer n, node_pointer end,
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|             value_type const& v)
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|         {
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|             std::size_t count = 0;
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|             for(;n != end; n = static_cast<node_pointer>(n->next_))
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|                 if (n->value() == v) ++count;
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|             return count;
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|         }
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| 
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| #else
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| 
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|         static bool group_equals(node_pointer n1, node_pointer end1,
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|                 node_pointer n2, node_pointer end2)
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|         {
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|             for(;;)
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|             {
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|                 if(!extractor::compare_mapped(
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|                     n1->value(), n2->value()))
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|                     return false;
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| 
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|                 n1 = static_cast<node_pointer>(n1->next_);
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|                 n2 = static_cast<node_pointer>(n2->next_);
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| 
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|                 if (n1 == end1) return n2 == end2;
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|                 if (n2 == end2) return false;
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|             }
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|         }
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| 
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| #endif
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| 
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|         // Emplace/Insert
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| 
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|         static inline void add_after_node(
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|                 node_pointer n,
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|                 node_pointer pos)
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|         {
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|             n->next_ = static_cast<node_pointer>(pos->group_prev_)->next_;
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|             n->group_prev_ = pos->group_prev_;
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|             static_cast<node_pointer>(pos->group_prev_)->next_ =
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|                 static_cast<link_pointer>(n);
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|             pos->group_prev_ = static_cast<link_pointer>(n);
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|         }
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| 
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|         inline node_pointer add_node(
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|                 node_constructor& a,
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|                 std::size_t hash,
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|                 node_pointer pos)
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|         {
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|             node_pointer n = a.release();
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|             n->hash_ = hash;
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|             if(pos) {
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|                 this->add_after_node(n, pos);
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|                 if (n->next_) {
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|                     std::size_t next_bucket =
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|                         static_cast<node_pointer>(n->next_)->hash_ %
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|                         this->bucket_count_;
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|                     if (next_bucket != hash % this->bucket_count_) {
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|                         this->get_bucket(next_bucket)->next_ = n;
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|                     }
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|                 }
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|             }
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|             else {
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|                 bucket_pointer b = this->get_bucket(hash % this->bucket_count_);
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| 
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|                 if (!b->next_)
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|                 {
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|                     previous_pointer start_node = this->get_previous_start();
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|                     
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|                     if (start_node->next_) {
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|                         this->get_bucket(
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|                             static_cast<node_pointer>(start_node->next_)->hash_
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|                                 % this->bucket_count_)->next_ = n;
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|                     }
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|     
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|                     b->next_ = start_node;
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|                     n->next_ = start_node->next_;
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|                     start_node->next_ = static_cast<link_pointer>(n);
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|                 }
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|                 else
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|                 {
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|                     n->next_ = b->next_->next_;
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|                     b->next_->next_ = static_cast<link_pointer>(n);
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|                 }
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|             }
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|             ++this->size_;
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|             return n;
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|         }
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| 
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|         node_pointer emplace_impl(node_constructor& a)
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|         {
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|             key_type const& k = this->get_key(a.value());
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|             std::size_t hash = this->hash_function()(k);
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|             node_pointer position = this->find_node(hash, k);
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| 
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|             // reserve has basic exception safety if the hash function
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|             // throws, strong otherwise.
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|             this->reserve_for_insert(this->size_ + 1);
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|             return this->add_node(a, hash, position);
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|         }
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| 
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|         void emplace_impl_no_rehash(node_constructor& a)
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|         {
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|             key_type const& k = this->get_key(a.value());
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|             std::size_t hash = this->hash_function()(k);
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|             this->add_node(a, hash,
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|                 this->find_node(hash, k));
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|         }
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| 
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| #if defined(BOOST_NO_RVALUE_REFERENCES)
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|         iterator emplace(boost::unordered::detail::emplace_args1<
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|                 boost::unordered::detail::please_ignore_this_overload> const&)
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|         {
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|             BOOST_ASSERT(false);
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|             return iterator();
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|         }
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| #endif
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| 
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|         template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
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|         iterator emplace(BOOST_UNORDERED_EMPLACE_ARGS)
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|         {
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|             node_constructor a(this->node_alloc());
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|             a.construct_node();
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|             a.construct_value(BOOST_UNORDERED_EMPLACE_FORWARD);
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| 
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|             return iterator(emplace_impl(a));
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|         }
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| 
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|         ////////////////////////////////////////////////////////////////////////
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|         // Insert range methods
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| 
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|         // if hash function throws, or inserting > 1 element, basic exception
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|         // safety. Strong otherwise
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|         template <class I>
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|         typename boost::unordered::detail::enable_if_forward<I, void>::type
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|             insert_range(I i, I j)
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|         {
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|             if(i == j) return;
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| 
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|             std::size_t distance = boost::unordered::detail::distance(i, j);
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|             if(distance == 1) {
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|                 node_constructor a(this->node_alloc());
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|                 a.construct_node();
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|                 a.construct_value2(*i);
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|                 emplace_impl(a);
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|             }
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|             else {
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|                 // Only require basic exception safety here
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|                 this->reserve_for_insert(this->size_ + distance);
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| 
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|                 node_constructor a(this->node_alloc());
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|                 for (; i != j; ++i) {
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|                     a.construct_node();
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|                     a.construct_value2(*i);
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|                     emplace_impl_no_rehash(a);
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|                 }
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|             }
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|         }
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| 
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|         template <class I>
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|         typename boost::unordered::detail::disable_if_forward<I, void>::type
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|             insert_range(I i, I j)
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|         {
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|             node_constructor a(this->node_alloc());
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|             for (; i != j; ++i) {
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|                 a.construct_node();
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|                 a.construct_value2(*i);
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|                 emplace_impl(a);
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|             }
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|         }
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| 
 | |
|         ////////////////////////////////////////////////////////////////////////
 | |
|         // Erase
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|         //
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|         // no throw
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| 
 | |
|         std::size_t erase_key(key_type const& k)
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|         {
 | |
|             if(!this->size_) return 0;
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| 
 | |
|             std::size_t hash = this->hash_function()(k);
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|             std::size_t bucket_index = hash % this->bucket_count_;
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|             bucket_pointer bucket = this->get_bucket(bucket_index);
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| 
 | |
|             previous_pointer prev = bucket->next_;
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|             if (!prev) return 0;
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| 
 | |
|             for (;;)
 | |
|             {
 | |
|                 if (!prev->next_) return 0;
 | |
|                 std::size_t node_hash =
 | |
|                     static_cast<node_pointer>(prev->next_)->hash_;
 | |
|                 if (node_hash % this->bucket_count_ != bucket_index)
 | |
|                     return 0;
 | |
|                 if (node_hash == hash &&
 | |
|                     this->key_eq()(k, this->get_key(
 | |
|                         static_cast<node_pointer>(prev->next_)->value())))
 | |
|                     break;
 | |
|                 prev = static_cast<previous_pointer>(
 | |
|                     static_cast<node_pointer>(prev->next_)->group_prev_);
 | |
|             }
 | |
| 
 | |
|             node_pointer pos = static_cast<node_pointer>(prev->next_);
 | |
|             link_pointer end1 =
 | |
|                 static_cast<node_pointer>(pos->group_prev_)->next_;
 | |
|             node_pointer end = static_cast<node_pointer>(end1);
 | |
|             prev->next_ = end1;
 | |
|             this->fix_buckets(bucket, prev, end);
 | |
|             return this->delete_nodes(pos, end);
 | |
|         }
 | |
| 
 | |
|         node_pointer erase(node_pointer r)
 | |
|         {
 | |
|             BOOST_ASSERT(r);
 | |
|             node_pointer next = static_cast<node_pointer>(r->next_);
 | |
| 
 | |
|             bucket_pointer bucket = this->get_bucket(
 | |
|                 r->hash_ % this->bucket_count_);
 | |
|             previous_pointer prev = unlink_node(*bucket, r);
 | |
| 
 | |
|             this->fix_buckets(bucket, prev, next);
 | |
| 
 | |
|             this->delete_node(r);
 | |
| 
 | |
|             return next;
 | |
|         }
 | |
| 
 | |
|         node_pointer erase_range(node_pointer r1, node_pointer r2)
 | |
|         {
 | |
|             if (r1 == r2) return r2;
 | |
| 
 | |
|             std::size_t bucket_index = r1->hash_ % this->bucket_count_;
 | |
|             previous_pointer prev = unlink_nodes(
 | |
|                 *this->get_bucket(bucket_index), r1, r2);
 | |
|             this->fix_buckets_range(bucket_index, prev, r1, r2);
 | |
|             this->delete_nodes(r1, r2);
 | |
| 
 | |
|             return r2;
 | |
|         }
 | |
| 
 | |
|         static previous_pointer unlink_node(bucket& b, node_pointer n)
 | |
|         {
 | |
|             node_pointer next = static_cast<node_pointer>(n->next_);
 | |
|             previous_pointer prev =
 | |
|                 static_cast<previous_pointer>(n->group_prev_);
 | |
| 
 | |
|             if(prev->next_ != n) {
 | |
|                 // The node is at the beginning of a group.
 | |
| 
 | |
|                 // Find the previous node pointer:
 | |
|                 prev = b.next_;
 | |
|                 while(prev->next_ != n) {
 | |
|                     prev = static_cast<previous_pointer>(
 | |
|                         static_cast<node_pointer>(prev->next_)->group_prev_);
 | |
|                 }
 | |
| 
 | |
|                 // Remove from group
 | |
|                 if (next && next->group_prev_ == static_cast<link_pointer>(n))
 | |
|                 {
 | |
|                     next->group_prev_ = n->group_prev_;
 | |
|                 }
 | |
|             }
 | |
|             else if (next && next->group_prev_ == static_cast<link_pointer>(n))
 | |
|             {
 | |
|                 // The deleted node is not at the end of the group, so
 | |
|                 // change the link from the next node.
 | |
|                 next->group_prev_ = n->group_prev_;
 | |
|             }
 | |
|             else {
 | |
|                 // The deleted node is at the end of the group, so the
 | |
|                 // first node in the group is pointing to it.
 | |
|                 // Find that to change its pointer.
 | |
|                 node_pointer x = static_cast<node_pointer>(n->group_prev_);
 | |
|                 while(x->group_prev_ != static_cast<link_pointer>(n)) {
 | |
|                     x = static_cast<node_pointer>(x->group_prev_);
 | |
|                 }
 | |
|                 x->group_prev_ = n->group_prev_;
 | |
|             }
 | |
| 
 | |
|             prev->next_ = static_cast<link_pointer>(next);
 | |
|             return prev;
 | |
|         }
 | |
| 
 | |
|         static previous_pointer unlink_nodes(bucket& b,
 | |
|                 node_pointer begin, node_pointer end)
 | |
|         {
 | |
|             previous_pointer prev = static_cast<previous_pointer>(
 | |
|                 begin->group_prev_);
 | |
| 
 | |
|             if(prev->next_ != static_cast<link_pointer>(begin)) {
 | |
|                 // The node is at the beginning of a group.
 | |
| 
 | |
|                 // Find the previous node pointer:
 | |
|                 prev = b.next_;
 | |
|                 while(prev->next_ != static_cast<link_pointer>(begin))
 | |
|                     prev = static_cast<previous_pointer>(
 | |
|                         static_cast<node_pointer>(prev->next_)->group_prev_);
 | |
| 
 | |
|                 if (end) split_group(end);
 | |
|             }
 | |
|             else {
 | |
|                 node_pointer group1 = split_group(begin);
 | |
| 
 | |
|                 if (end) {
 | |
|                     node_pointer group2 = split_group(end);
 | |
| 
 | |
|                     if(begin == group2) {
 | |
|                         link_pointer end1 = group1->group_prev_;
 | |
|                         link_pointer end2 = group2->group_prev_;
 | |
|                         group1->group_prev_ = end2;
 | |
|                         group2->group_prev_ = end1;
 | |
|                     }
 | |
|                 }
 | |
|             }
 | |
| 
 | |
|             prev->next_ = static_cast<link_pointer>(end);
 | |
| 
 | |
|             return prev;
 | |
|         }
 | |
| 
 | |
|         // Break a ciruclar list into two, with split as the beginning
 | |
|         // of the second group (if split is at the beginning then don't
 | |
|         // split).
 | |
|         static node_pointer split_group(node_pointer split)
 | |
|         {
 | |
|             // Find first node in group.
 | |
|             node_pointer first = split;
 | |
|             while (static_cast<node_pointer>(first->group_prev_)->next_ ==
 | |
|                     static_cast<link_pointer>(first))
 | |
|                 first = static_cast<node_pointer>(first->group_prev_);
 | |
| 
 | |
|             if(first == split) return split;
 | |
| 
 | |
|             link_pointer last = first->group_prev_;
 | |
|             first->group_prev_ = split->group_prev_;
 | |
|             split->group_prev_ = last;
 | |
| 
 | |
|             return first;
 | |
|         }
 | |
| 
 | |
|         ////////////////////////////////////////////////////////////////////////
 | |
|         // copy_buckets_to
 | |
|         //
 | |
|         // Basic exception safety. If an exception is thrown this will
 | |
|         // leave dst partially filled and the buckets unset.
 | |
| 
 | |
|         static void copy_buckets_to(buckets const& src, buckets& dst)
 | |
|         {
 | |
|             BOOST_ASSERT(!dst.buckets_);
 | |
| 
 | |
|             dst.create_buckets();
 | |
| 
 | |
|             node_constructor a(dst.node_alloc());
 | |
| 
 | |
|             node_pointer n = src.get_start();
 | |
|             previous_pointer prev = dst.get_previous_start();
 | |
| 
 | |
|             while(n) {
 | |
|                 std::size_t hash = n->hash_;
 | |
|                 node_pointer group_end =
 | |
|                     static_cast<node_pointer>(
 | |
|                         static_cast<node_pointer>(n->group_prev_)->next_);
 | |
| 
 | |
|                 a.construct_node();
 | |
|                 a.construct_value2(n->value());
 | |
| 
 | |
|                 node_pointer first_node = a.release();
 | |
|                 node_pointer end = first_node;
 | |
|                 first_node->hash_ = hash;
 | |
|                 prev->next_ = static_cast<link_pointer>(first_node);
 | |
|                 ++dst.size_;
 | |
| 
 | |
|                 for(n = static_cast<node_pointer>(n->next_); n != group_end;
 | |
|                         n = static_cast<node_pointer>(n->next_))
 | |
|                 {
 | |
|                     a.construct_node();
 | |
|                     a.construct_value2(n->value());
 | |
|                     end = a.release();
 | |
|                     end->hash_ = hash;
 | |
|                     add_after_node(end, first_node);
 | |
|                     ++dst.size_;
 | |
|                 }
 | |
| 
 | |
|                 prev = place_in_bucket(dst, prev, end);
 | |
|             }
 | |
|         }
 | |
| 
 | |
|         ////////////////////////////////////////////////////////////////////////
 | |
|         // move_buckets_to
 | |
|         //
 | |
|         // Basic exception safety. The source nodes are left in an unusable
 | |
|         // state if an exception throws.
 | |
| 
 | |
|         static void move_buckets_to(buckets& src, buckets& dst)
 | |
|         {
 | |
|             BOOST_ASSERT(!dst.buckets_);
 | |
| 
 | |
|             dst.create_buckets();
 | |
| 
 | |
|             node_constructor a(dst.node_alloc());
 | |
| 
 | |
|             node_pointer n = src.get_start();
 | |
|             previous_pointer prev = dst.get_previous_start();
 | |
| 
 | |
|             while(n) {
 | |
|                 std::size_t hash = n->hash_;
 | |
|                 node_pointer group_end =
 | |
|                     static_cast<node_pointer>(
 | |
|                         static_cast<node_pointer>(n->group_prev_)->next_);
 | |
| 
 | |
|                 a.construct_node();
 | |
|                 a.construct_value2(boost::move(n->value()));
 | |
| 
 | |
|                 node_pointer first_node = a.release();
 | |
|                 node_pointer end = first_node;
 | |
|                 first_node->hash_ = hash;
 | |
|                 prev->next_ = static_cast<link_pointer>(first_node);
 | |
|                 ++dst.size_;
 | |
| 
 | |
|                 for(n = static_cast<node_pointer>(n->next_); n != group_end;
 | |
|                         n = static_cast<node_pointer>(n->next_))
 | |
|                 {
 | |
|                     a.construct_node();
 | |
|                     a.construct_value2(boost::move(n->value()));
 | |
|                     end = a.release();
 | |
|                     end->hash_ = hash;
 | |
|                     add_after_node(end, first_node);
 | |
|                     ++dst.size_;
 | |
|                 }
 | |
| 
 | |
|                 prev = place_in_bucket(dst, prev, end);
 | |
|             }
 | |
|         }
 | |
| 
 | |
|         // strong otherwise exception safety
 | |
|         void rehash_impl(std::size_t num_buckets)
 | |
|         {
 | |
|             BOOST_ASSERT(this->size_);
 | |
| 
 | |
|             buckets dst(this->node_alloc(), num_buckets);
 | |
|             dst.create_buckets();
 | |
| 
 | |
|             previous_pointer src_start = this->get_previous_start();
 | |
|             previous_pointer dst_start = dst.get_previous_start();
 | |
| 
 | |
|             dst_start->next_ = src_start->next_;
 | |
|             src_start->next_ = link_pointer();
 | |
|             dst.size_ = this->size_;
 | |
|             this->size_ = 0;
 | |
| 
 | |
|             previous_pointer prev = dst_start;
 | |
|             while (prev->next_)
 | |
|                 prev = place_in_bucket(dst, prev,
 | |
|                     static_cast<node_pointer>(
 | |
|                         static_cast<node_pointer>(prev->next_)->group_prev_));
 | |
| 
 | |
|             // Swap the new nodes back into the container and setup the
 | |
|             // variables.
 | |
|             dst.swap(*this); // no throw
 | |
|         }
 | |
| 
 | |
|         // Iterate through the nodes placing them in the correct buckets.
 | |
|         // pre: prev->next_ is not null.
 | |
|         static previous_pointer place_in_bucket(buckets& dst,
 | |
|                 previous_pointer prev, node_pointer end)
 | |
|         {
 | |
|             bucket_pointer b = dst.get_bucket(end->hash_ % dst.bucket_count_);
 | |
| 
 | |
|             if (!b->next_) {
 | |
|                 b->next_ = static_cast<node_pointer>(prev);
 | |
|                 return static_cast<previous_pointer>(end);
 | |
|             }
 | |
|             else {
 | |
|                 link_pointer next = end->next_;
 | |
|                 end->next_ = b->next_->next_;
 | |
|                 b->next_->next_ = prev->next_;
 | |
|                 prev->next_ = next;
 | |
|                 return prev;
 | |
|             }
 | |
|         }
 | |
|     };
 | |
| }}}
 | |
| 
 | |
| #endif
 |