da29608a7a
2011-11-23 François Dumont <fdumont@gcc.gnu.org> PR libstdc++/41975 * include/bits/hashtable.h (_Hashtable<>): Major data model modification to limit performance impact of empty buckets in erase(iterator) implementation. * include/bits/hashtable_policy.h (_Hashtable_iterator, _Hashtable_const_iterator): Remove not used anymore. * include/bits/hashtable_policy.h (_Prime_rehash_policy): Remove _M_grow_factor, just use natural evolution of prime numbers. Add _M_prev_size to know when the number of buckets can be reduced. * include/bits/unordered_set.h (__unordered_set<>, __unordered_multiset<>), unordered_map.h (__unordered_map<>, __unordered_multimap<>): Change default value of cache hash code template parameter, false for integral types with noexcept hash functor, true otherwise. * include/debug/unordered_map, unordered_set: Adapt transformation from iterator/const_iterator to respectively local_iterator/const_local_iterator. * testsuite/performance/23_containers/copy_construct/unordered_set.cc: New. * testsuite/23_containers/unordered_set/instantiation_neg.cc: New. * testsuite/23_containers/unordered_set/hash_policy/rehash.cc: New. * testsuite/23_containers/unordered_multiset/cons/copy.cc: New. * testsuite/23_containers/unordered_multiset/erase/1.cc, 24061-multiset.cc: Add checks on the number of bucket elements. * testsuite/23_containers/unordered_multiset/insert/multiset_range.cc, multiset_single.cc, multiset_single_move.cc: Likewise. From-SVN: r181677
1620 lines
57 KiB
C++
1620 lines
57 KiB
C++
// hashtable.h header -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/hashtable.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{unordered_map, unordered_set}
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*/
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#ifndef _HASHTABLE_H
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#define _HASHTABLE_H 1
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#pragma GCC system_header
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#include <bits/hashtable_policy.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Class template _Hashtable, class definition.
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// Meaning of class template _Hashtable's template parameters
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// _Key and _Value: arbitrary CopyConstructible types.
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// _Allocator: an allocator type ([lib.allocator.requirements]) whose
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// value type is Value. As a conforming extension, we allow for
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// value type != Value.
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// _ExtractKey: function object that takes an object of type Value
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// and returns a value of type _Key.
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// _Equal: function object that takes two objects of type k and returns
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// a bool-like value that is true if the two objects are considered equal.
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// _H1: the hash function. A unary function object with argument type
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// Key and result type size_t. Return values should be distributed
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// over the entire range [0, numeric_limits<size_t>:::max()].
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// _H2: the range-hashing function (in the terminology of Tavori and
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// Dreizin). A binary function object whose argument types and result
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// type are all size_t. Given arguments r and N, the return value is
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// in the range [0, N).
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// _Hash: the ranged hash function (Tavori and Dreizin). A binary function
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// whose argument types are _Key and size_t and whose result type is
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// size_t. Given arguments k and N, the return value is in the range
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// [0, N). Default: hash(k, N) = h2(h1(k), N). If _Hash is anything other
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// than the default, _H1 and _H2 are ignored.
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// _RehashPolicy: Policy class with three members, all of which govern
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// the bucket count. _M_next_bkt(n) returns a bucket count no smaller
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// than n. _M_bkt_for_elements(n) returns a bucket count appropriate
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// for an element count of n. _M_need_rehash(n_bkt, n_elt, n_ins)
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// determines whether, if the current bucket count is n_bkt and the
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// current element count is n_elt, we need to increase the bucket
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// count. If so, returns make_pair(true, n), where n is the new
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// bucket count. If not, returns make_pair(false, <anything>).
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// __cache_hash_code: bool. true if we store the value of the hash
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// function along with the value. This is a time-space tradeoff.
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// Storing it may improve lookup speed by reducing the number of times
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// we need to call the Equal function.
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// __constant_iterators: bool. true if iterator and const_iterator are
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// both constant iterator types. This is true for unordered_set and
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// unordered_multiset, false for unordered_map and unordered_multimap.
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// __unique_keys: bool. true if the return value of _Hashtable::count(k)
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// is always at most one, false if it may be an arbitrary number. This
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// true for unordered_set and unordered_map, false for unordered_multiset
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// and unordered_multimap.
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/**
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* Here's _Hashtable data structure, each _Hashtable has:
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* - _Bucket[] _M_buckets
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* - size_type _M_bucket_count
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* - size_type _M_begin_bucket_index
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* - size_type _M_element_count
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*
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* with _Bucket being _Node* and _Node:
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* - _Node* _M_next
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* - Tp _M_value
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* - size_t _M_code if cache_hash_code is true
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*
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* In terms of Standard containers the hastable is like the aggregation of:
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* - std::forward_list<_Node> containing the elements
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* - std::vector<std::forward_list<_Node>::iterator> representing the buckets
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*
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* The first non-empty bucket with index _M_begin_bucket_index contains the
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* first container node which is also the first bucket node whereas other
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* non-empty buckets contain the node before the first bucket node. This is so
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* to implement something like a std::forward_list::erase_after on container
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* erase calls.
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*
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* Access to the bucket last element require a check on the hash code to see
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* if the node is still in the bucket. Such a design impose a quite efficient
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* hash functor and is one of the reasons it is highly advise to set
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* __cache_hash_code to true.
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*
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* The container iterators are simply built from nodes. This way incrementing
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* the iterator is perfectly efficient no matter how many empty buckets there
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* are in the container.
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*
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* On insert we compute element hash code and thanks to it find the bucket
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* index. If the element is the first one in the bucket we must find the
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* previous non-empty bucket where the previous node rely. To keep this loop
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* minimal it is important that the number of bucket is not too high compared
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* to the number of elements. So the hash policy must be carefully design so
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* that it computes a bucket count large enough to respect the user defined
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* load factor but also not too large to limit impact on the insert operation.
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*
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* On erase, the simple iterator design impose to use the hash functor to get
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* the index of the bucket to update. For this reason, when __cache_hash_code
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* is set to false, there is a static assertion that the hash functor cannot
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* throw.
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*
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* _M_begin_bucket_index is used to offer contant time access to the container
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* begin iterator.
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*/
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template<typename _Key, typename _Value, typename _Allocator,
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typename _ExtractKey, typename _Equal,
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typename _H1, typename _H2, typename _Hash,
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typename _RehashPolicy,
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bool __cache_hash_code,
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bool __constant_iterators,
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bool __unique_keys>
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class _Hashtable
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: public __detail::_Rehash_base<_RehashPolicy,
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_Hashtable<_Key, _Value, _Allocator,
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_ExtractKey,
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_Equal, _H1, _H2, _Hash,
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_RehashPolicy,
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__cache_hash_code,
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__constant_iterators,
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__unique_keys> >,
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public __detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
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_H1, _H2, _Hash, __cache_hash_code>,
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public __detail::_Map_base<_Key, _Value, _ExtractKey, __unique_keys,
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_Hashtable<_Key, _Value, _Allocator,
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_ExtractKey,
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_Equal, _H1, _H2, _Hash,
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_RehashPolicy,
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__cache_hash_code,
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__constant_iterators,
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__unique_keys> >,
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public __detail::_Equality_base<_ExtractKey, __unique_keys,
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_Hashtable<_Key, _Value, _Allocator,
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_ExtractKey,
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_Equal, _H1, _H2, _Hash,
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_RehashPolicy,
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__cache_hash_code,
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__constant_iterators,
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__unique_keys> >
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{
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static_assert(__or_<integral_constant<bool, __cache_hash_code>,
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__detail::__is_noexcept_hash<_Key, _H1>>::value,
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"Cache the hash code or qualify your hash functor with noexcept");
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public:
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typedef _Allocator allocator_type;
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typedef _Value value_type;
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typedef _Key key_type;
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typedef _Equal key_equal;
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// mapped_type, if present, comes from _Map_base.
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// hasher, if present, comes from _Hash_code_base.
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typedef typename _Allocator::pointer pointer;
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typedef typename _Allocator::const_pointer const_pointer;
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typedef typename _Allocator::reference reference;
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typedef typename _Allocator::const_reference const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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typedef __detail::_Node_iterator<value_type, __constant_iterators,
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__cache_hash_code>
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local_iterator;
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typedef __detail::_Node_const_iterator<value_type,
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__constant_iterators,
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__cache_hash_code>
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const_local_iterator;
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typedef local_iterator iterator;
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typedef const_local_iterator const_iterator;
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template<typename _Key2, typename _Value2, typename _Ex2, bool __unique2,
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typename _Hashtable2>
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friend struct __detail::_Map_base;
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private:
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typedef typename _RehashPolicy::_State _RehashPolicyState;
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typedef __detail::_Hash_node<_Value, __cache_hash_code> _Node;
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typedef typename _Allocator::template rebind<_Node>::other
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_Node_allocator_type;
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typedef _Node* _Bucket;
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//typedef __detail::_Bucket<_Value, __cache_hash_code> _Bucket;
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typedef typename _Allocator::template rebind<_Bucket>::other
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_Bucket_allocator_type;
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typedef typename _Allocator::template rebind<_Value>::other
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_Value_allocator_type;
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_Node_allocator_type _M_node_allocator;
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_Bucket* _M_buckets;
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size_type _M_bucket_count;
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size_type _M_begin_bucket_index; // First non-empty bucket.
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size_type _M_element_count;
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_RehashPolicy _M_rehash_policy;
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template<typename... _Args>
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_Node*
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_M_allocate_node(_Args&&... __args);
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void
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_M_deallocate_node(_Node* __n);
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// Deallocate all nodes contained in the bucket array, buckets' nodes
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// are not linked to each other
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void
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_M_deallocate_nodes(_Bucket*, size_type);
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// Deallocate the linked list of nodes pointed to by __n
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void
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_M_deallocate_nodes(_Node* __n);
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_Bucket*
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_M_allocate_buckets(size_type __n);
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void
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_M_deallocate_buckets(_Bucket*, size_type __n);
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// Gets bucket begin dealing with the difference between first non-empty
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// bucket containing the first container node and the other non-empty
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// buckets containing the node before the one belonging to the bucket.
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_Node*
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_M_bucket_begin(size_type __bkt) const;
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// Gets the bucket last node if any
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_Node*
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_M_bucket_end(size_type __bkt) const;
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// Gets the bucket node after the last if any
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_Node*
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_M_bucket_past_the_end(size_type __bkt) const
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{
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_Node* __end = _M_bucket_end(__bkt);
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return __end ? __end->_M_next : nullptr;
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}
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public:
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// Constructor, destructor, assignment, swap
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_Hashtable(size_type __bucket_hint,
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const _H1&, const _H2&, const _Hash&,
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const _Equal&, const _ExtractKey&,
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const allocator_type&);
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template<typename _InputIterator>
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_Hashtable(_InputIterator __first, _InputIterator __last,
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size_type __bucket_hint,
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const _H1&, const _H2&, const _Hash&,
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const _Equal&, const _ExtractKey&,
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const allocator_type&);
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_Hashtable(const _Hashtable&);
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_Hashtable(_Hashtable&&);
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_Hashtable&
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operator=(const _Hashtable& __ht)
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{
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_Hashtable __tmp(__ht);
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this->swap(__tmp);
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return *this;
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}
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_Hashtable&
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operator=(_Hashtable&& __ht)
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{
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// NB: DR 1204.
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// NB: DR 675.
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this->clear();
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this->swap(__ht);
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return *this;
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}
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~_Hashtable() noexcept;
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void swap(_Hashtable&);
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// Basic container operations
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iterator
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begin() noexcept
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{ return iterator(_M_buckets[_M_begin_bucket_index]); }
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const_iterator
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begin() const noexcept
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{ return const_iterator(_M_buckets[_M_begin_bucket_index]); }
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iterator
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end() noexcept
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{ return iterator(nullptr); }
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const_iterator
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end() const noexcept
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{ return const_iterator(nullptr); }
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const_iterator
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cbegin() const noexcept
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{ return const_iterator(_M_buckets[_M_begin_bucket_index]); }
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const_iterator
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cend() const noexcept
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{ return const_iterator(nullptr); }
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size_type
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size() const noexcept
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{ return _M_element_count; }
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bool
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empty() const noexcept
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{ return size() == 0; }
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allocator_type
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get_allocator() const noexcept
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{ return allocator_type(_M_node_allocator); }
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size_type
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max_size() const noexcept
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{ return _M_node_allocator.max_size(); }
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// Observers
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key_equal
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key_eq() const
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{ return this->_M_eq; }
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// hash_function, if present, comes from _Hash_code_base.
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// Bucket operations
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size_type
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bucket_count() const noexcept
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{ return _M_bucket_count; }
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size_type
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max_bucket_count() const noexcept
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{ return max_size(); }
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size_type
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bucket_size(size_type __n) const
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{ return std::distance(begin(__n), end(__n)); }
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size_type
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bucket(const key_type& __k) const
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{
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return this->_M_bucket_index(__k, this->_M_hash_code(__k),
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bucket_count());
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}
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local_iterator
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begin(size_type __n)
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{ return local_iterator(_M_bucket_begin(__n)); }
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local_iterator
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end(size_type __n)
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{ return local_iterator(_M_bucket_past_the_end(__n)); }
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const_local_iterator
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begin(size_type __n) const
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{ return const_local_iterator(_M_bucket_begin(__n)); }
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const_local_iterator
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end(size_type __n) const
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{ return const_local_iterator(_M_bucket_past_the_end(__n)); }
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// DR 691.
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const_local_iterator
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cbegin(size_type __n) const
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{ return const_local_iterator(_M_bucket_begin(__n)); }
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const_local_iterator
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cend(size_type __n) const
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{ return const_local_iterator(_M_bucket_past_the_end(__n)); }
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float
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load_factor() const noexcept
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{
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return static_cast<float>(size()) / static_cast<float>(bucket_count());
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}
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// max_load_factor, if present, comes from _Rehash_base.
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// Generalization of max_load_factor. Extension, not found in TR1. Only
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// useful if _RehashPolicy is something other than the default.
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const _RehashPolicy&
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__rehash_policy() const
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{ return _M_rehash_policy; }
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void
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__rehash_policy(const _RehashPolicy&);
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// Lookup.
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iterator
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find(const key_type& __k);
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const_iterator
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find(const key_type& __k) const;
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size_type
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count(const key_type& __k) const;
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std::pair<iterator, iterator>
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equal_range(const key_type& __k);
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std::pair<const_iterator, const_iterator>
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equal_range(const key_type& __k) const;
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private:
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// Find and insert helper functions and types
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_Node*
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_M_find_node(size_type, const key_type&,
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typename _Hashtable::_Hash_code_type) const;
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// Insert a node in an empty bucket
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void
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_M_insert_bucket_begin(size_type, _Node*);
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// Insert a node after an other one in a non-empty bucket
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void
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_M_insert_after(size_type, _Node*, _Node*);
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// Remove the bucket first node
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void
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_M_remove_bucket_begin(size_type __bkt, _Node* __next_n,
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size_type __next_bkt);
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// Get the node before __n in the bucket __bkt
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_Node*
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_M_get_previous_node(size_type __bkt, _Node* __n);
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template<typename _Arg>
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iterator
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_M_insert_bucket(_Arg&&, size_type,
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typename _Hashtable::_Hash_code_type);
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typedef typename std::conditional<__unique_keys,
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std::pair<iterator, bool>,
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iterator>::type
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_Insert_Return_Type;
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typedef typename std::conditional<__unique_keys,
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std::_Select1st<_Insert_Return_Type>,
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std::_Identity<_Insert_Return_Type>
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>::type
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_Insert_Conv_Type;
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protected:
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template<typename _Arg>
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std::pair<iterator, bool>
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_M_insert(_Arg&&, std::true_type);
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template<typename _Arg>
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iterator
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_M_insert(_Arg&&, std::false_type);
|
|
|
|
public:
|
|
// Insert and erase
|
|
_Insert_Return_Type
|
|
insert(const value_type& __v)
|
|
{ return _M_insert(__v, integral_constant<bool, __unique_keys>()); }
|
|
|
|
iterator
|
|
insert(const_iterator, const value_type& __v)
|
|
{ return _Insert_Conv_Type()(insert(__v)); }
|
|
|
|
template<typename _Pair, typename = typename
|
|
std::enable_if<__and_<integral_constant<bool, !__constant_iterators>,
|
|
std::is_convertible<_Pair,
|
|
value_type>>::value>::type>
|
|
_Insert_Return_Type
|
|
insert(_Pair&& __v)
|
|
{ return _M_insert(std::forward<_Pair>(__v),
|
|
integral_constant<bool, __unique_keys>()); }
|
|
|
|
template<typename _Pair, typename = typename
|
|
std::enable_if<__and_<integral_constant<bool, !__constant_iterators>,
|
|
std::is_convertible<_Pair,
|
|
value_type>>::value>::type>
|
|
iterator
|
|
insert(const_iterator, _Pair&& __v)
|
|
{ return _Insert_Conv_Type()(insert(std::forward<_Pair>(__v))); }
|
|
|
|
template<typename _InputIterator>
|
|
void
|
|
insert(_InputIterator __first, _InputIterator __last);
|
|
|
|
void
|
|
insert(initializer_list<value_type> __l)
|
|
{ this->insert(__l.begin(), __l.end()); }
|
|
|
|
iterator
|
|
erase(const_iterator);
|
|
|
|
// LWG 2059.
|
|
iterator
|
|
erase(iterator __it)
|
|
{ return erase(const_iterator(__it)); }
|
|
|
|
size_type
|
|
erase(const key_type&);
|
|
|
|
iterator
|
|
erase(const_iterator, const_iterator);
|
|
|
|
void
|
|
clear() noexcept;
|
|
|
|
// Set number of buckets to be appropriate for container of n element.
|
|
void rehash(size_type __n);
|
|
|
|
// DR 1189.
|
|
// reserve, if present, comes from _Rehash_base.
|
|
|
|
private:
|
|
// Unconditionally change size of bucket array to n, restore hash policy
|
|
// state to __state on exception.
|
|
void _M_rehash(size_type __n, const _RehashPolicyState& __state);
|
|
};
|
|
|
|
|
|
// Definitions of class template _Hashtable's out-of-line member functions.
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename... _Args>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Node*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_allocate_node(_Args&&... __args)
|
|
{
|
|
_Node* __n = _M_node_allocator.allocate(1);
|
|
__try
|
|
{
|
|
_M_node_allocator.construct(__n, std::forward<_Args>(__args)...);
|
|
return __n;
|
|
}
|
|
__catch(...)
|
|
{
|
|
_M_node_allocator.deallocate(__n, 1);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_deallocate_node(_Node* __n)
|
|
{
|
|
_M_node_allocator.destroy(__n);
|
|
_M_node_allocator.deallocate(__n, 1);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_deallocate_nodes(_Bucket* __buckets, size_type __n)
|
|
{
|
|
for (size_type __i = 0; __i != __n; ++__i)
|
|
_M_deallocate_nodes(__buckets[__i]);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_deallocate_nodes(_Node* __n)
|
|
{
|
|
while (__n)
|
|
{
|
|
_Node* __tmp = __n;
|
|
__n = __n->_M_next;
|
|
_M_deallocate_node(__tmp);
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Bucket*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_allocate_buckets(size_type __n)
|
|
{
|
|
_Bucket_allocator_type __alloc(_M_node_allocator);
|
|
|
|
// We allocate one extra bucket to have _M_begin_bucket_index
|
|
// point to it as long as container is empty
|
|
_Bucket* __p = __alloc.allocate(__n + 1);
|
|
__builtin_memset(__p, 0, (__n + 1) * sizeof(_Bucket));
|
|
return __p;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_deallocate_buckets(_Bucket* __p, size_type __n)
|
|
{
|
|
_Bucket_allocator_type __alloc(_M_node_allocator);
|
|
__alloc.deallocate(__p, __n + 1);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
|
|
_Equal, _H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Node*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_bucket_begin(size_type __bkt) const
|
|
{
|
|
if (__bkt == _M_begin_bucket_index)
|
|
return _M_buckets[__bkt];
|
|
_Node* __n = _M_buckets[__bkt];
|
|
return __n ? __n->_M_next : nullptr;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
|
|
_Equal, _H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Node*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_bucket_end(size_type __bkt) const
|
|
{
|
|
_Node* __n = _M_bucket_begin(__bkt);
|
|
if (__n)
|
|
for (;; __n = __n->_M_next)
|
|
if (!__n->_M_next
|
|
|| this->_M_bucket_index(__n->_M_next, _M_bucket_count)
|
|
!= __bkt)
|
|
break;
|
|
return __n;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_Hashtable(size_type __bucket_hint,
|
|
const _H1& __h1, const _H2& __h2, const _Hash& __h,
|
|
const _Equal& __eq, const _ExtractKey& __exk,
|
|
const allocator_type& __a)
|
|
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(),
|
|
__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, __chc>(__exk, __eq,
|
|
__h1, __h2, __h),
|
|
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(),
|
|
_M_node_allocator(__a),
|
|
_M_bucket_count(0),
|
|
_M_element_count(0),
|
|
_M_rehash_policy()
|
|
{
|
|
_M_bucket_count = _M_rehash_policy._M_next_bkt(__bucket_hint);
|
|
// We don't want the rehash policy to ask for the hashtable to shrink
|
|
// on the first insertion so we need to reset its previous resize level.
|
|
_M_rehash_policy._M_prev_resize = 0;
|
|
_M_buckets = _M_allocate_buckets(_M_bucket_count);
|
|
_M_begin_bucket_index = _M_bucket_count;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename _InputIterator>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_Hashtable(_InputIterator __f, _InputIterator __l,
|
|
size_type __bucket_hint,
|
|
const _H1& __h1, const _H2& __h2, const _Hash& __h,
|
|
const _Equal& __eq, const _ExtractKey& __exk,
|
|
const allocator_type& __a)
|
|
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(),
|
|
__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, __chc>(__exk, __eq,
|
|
__h1, __h2, __h),
|
|
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(),
|
|
_M_node_allocator(__a),
|
|
_M_bucket_count(0),
|
|
_M_element_count(0),
|
|
_M_rehash_policy()
|
|
{
|
|
_M_bucket_count = std::max(_M_rehash_policy._M_next_bkt(__bucket_hint),
|
|
_M_rehash_policy.
|
|
_M_bkt_for_elements(__detail::
|
|
__distance_fw(__f,
|
|
__l)));
|
|
// We don't want the rehash policy to ask for the hashtable to shrink
|
|
// on the first insertion so we need to reset its previous resize
|
|
// level.
|
|
_M_rehash_policy._M_prev_resize = 0;
|
|
_M_buckets = _M_allocate_buckets(_M_bucket_count);
|
|
_M_begin_bucket_index = _M_bucket_count;
|
|
__try
|
|
{
|
|
for (; __f != __l; ++__f)
|
|
this->insert(*__f);
|
|
}
|
|
__catch(...)
|
|
{
|
|
clear();
|
|
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_Hashtable(const _Hashtable& __ht)
|
|
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(__ht),
|
|
__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, __chc>(__ht),
|
|
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(__ht),
|
|
_M_node_allocator(__ht._M_node_allocator),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_begin_bucket_index(__ht._M_begin_bucket_index),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
_M_buckets = _M_allocate_buckets(_M_bucket_count);
|
|
__try
|
|
{
|
|
const _Node* __ht_n = __ht._M_buckets[__ht._M_begin_bucket_index];
|
|
if (!__ht_n)
|
|
return;
|
|
|
|
// Note that the copy constructor do not rely on hash code usage.
|
|
// First deal with the special first node that is directly store in
|
|
// the first non-empty bucket
|
|
_Node* __this_n = _M_allocate_node(__ht_n->_M_v);
|
|
this->_M_copy_code(__this_n, __ht_n);
|
|
_M_buckets[_M_begin_bucket_index] = __this_n;
|
|
__ht_n = __ht_n->_M_next;
|
|
// Second deal with following non-empty buckets containing previous
|
|
// nodes node.
|
|
for (size_type __i = __ht._M_begin_bucket_index + 1;
|
|
__i != __ht._M_bucket_count; ++__i)
|
|
{
|
|
if (!__ht._M_buckets[__i])
|
|
continue;
|
|
|
|
for (; __ht_n != __ht._M_buckets[__i]->_M_next;
|
|
__ht_n = __ht_n->_M_next)
|
|
{
|
|
__this_n->_M_next = _M_allocate_node(__ht_n->_M_v);
|
|
this->_M_copy_code(__this_n->_M_next, __ht_n);
|
|
__this_n = __this_n->_M_next;
|
|
}
|
|
|
|
_M_buckets[__i] = __this_n;
|
|
}
|
|
// Last finalize copy of the nodes of the last non-empty bucket
|
|
for (; __ht_n; __ht_n = __ht_n->_M_next)
|
|
{
|
|
__this_n->_M_next = _M_allocate_node(__ht_n->_M_v);
|
|
this->_M_copy_code(__this_n->_M_next, __ht_n);
|
|
__this_n = __this_n->_M_next;
|
|
}
|
|
}
|
|
__catch(...)
|
|
{
|
|
clear();
|
|
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_Hashtable(_Hashtable&& __ht)
|
|
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(__ht),
|
|
__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, __chc>(__ht),
|
|
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(__ht),
|
|
_M_node_allocator(std::move(__ht._M_node_allocator)),
|
|
_M_buckets(__ht._M_buckets),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_begin_bucket_index(__ht._M_begin_bucket_index),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
__ht._M_rehash_policy = _RehashPolicy();
|
|
__ht._M_bucket_count = __ht._M_rehash_policy._M_next_bkt(0);
|
|
__ht._M_buckets = __ht._M_allocate_buckets(__ht._M_bucket_count);
|
|
__ht._M_begin_bucket_index = __ht._M_bucket_count;
|
|
__ht._M_element_count = 0;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
~_Hashtable() noexcept
|
|
{
|
|
clear();
|
|
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
swap(_Hashtable& __x)
|
|
{
|
|
// The only base class with member variables is hash_code_base. We
|
|
// define _Hash_code_base::_M_swap because different specializations
|
|
// have different members.
|
|
__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, __chc>::_M_swap(__x);
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 431. Swapping containers with unequal allocators.
|
|
std::__alloc_swap<_Node_allocator_type>::_S_do_it(_M_node_allocator,
|
|
__x._M_node_allocator);
|
|
|
|
std::swap(_M_rehash_policy, __x._M_rehash_policy);
|
|
std::swap(_M_buckets, __x._M_buckets);
|
|
std::swap(_M_bucket_count, __x._M_bucket_count);
|
|
std::swap(_M_begin_bucket_index, __x._M_begin_bucket_index);
|
|
std::swap(_M_element_count, __x._M_element_count);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
__rehash_policy(const _RehashPolicy& __pol)
|
|
{
|
|
size_type __n_bkt = __pol._M_bkt_for_elements(_M_element_count);
|
|
if (__n_bkt != _M_bucket_count)
|
|
_M_rehash(__n_bkt, _M_rehash_policy._M_state());
|
|
_M_rehash_policy = __pol;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
find(const key_type& __k)
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
_Node* __p = _M_find_node(__n, __k, __code);
|
|
return __p ? iterator(__p) : this->end();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::const_iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
find(const key_type& __k) const
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
_Node* __p = _M_find_node(__n, __k, __code);
|
|
return __p ? const_iterator(__p) : this->end();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::size_type
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
count(const key_type& __k) const
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
_Node* __p = _M_bucket_begin(__n);
|
|
if (!__p)
|
|
return 0;
|
|
|
|
std::size_t __result = 0;
|
|
for (;; __p = __p->_M_next)
|
|
{
|
|
if (this->_M_compare(__k, __code, __p))
|
|
++__result;
|
|
else if (__result)
|
|
// All equivalent values are next to each other, if we found a not
|
|
// equivalent value after an equivalent one it means that we won't
|
|
// find anymore an equivalent value.
|
|
break;
|
|
if (!__p->_M_next
|
|
|| this->_M_bucket_index(__p->_M_next, _M_bucket_count)
|
|
!= __n)
|
|
break;
|
|
}
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
|
|
_ExtractKey, _Equal, _H1,
|
|
_H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator,
|
|
typename _Hashtable<_Key, _Value, _Allocator,
|
|
_ExtractKey, _Equal, _H1,
|
|
_H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
equal_range(const key_type& __k)
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
_Node* __p = _M_find_node(__n, __k, __code);
|
|
|
|
if (__p)
|
|
{
|
|
_Node* __p1 = __p->_M_next;
|
|
while (__p1
|
|
&& this->_M_bucket_index(__p1, _M_bucket_count) == __n
|
|
&& this->_M_compare(__k, __code, __p1))
|
|
__p1 = __p1->_M_next;
|
|
|
|
return std::make_pair(iterator(__p), iterator(__p1));
|
|
}
|
|
else
|
|
return std::make_pair(this->end(), this->end());
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
|
|
_ExtractKey, _Equal, _H1,
|
|
_H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::const_iterator,
|
|
typename _Hashtable<_Key, _Value, _Allocator,
|
|
_ExtractKey, _Equal, _H1,
|
|
_H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::const_iterator>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
equal_range(const key_type& __k) const
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
_Node* __p = _M_find_node(__n, __k, __code);
|
|
|
|
if (__p)
|
|
{
|
|
_Node* __p1 = __p->_M_next;
|
|
while (__p1
|
|
&& this->_M_bucket_index(__p1, _M_bucket_count) == __n
|
|
&& this->_M_compare(__k, __code, __p1))
|
|
__p1 = __p1->_M_next;
|
|
|
|
return std::make_pair(const_iterator(__p), const_iterator(__p1));
|
|
}
|
|
else
|
|
return std::make_pair(this->end(), this->end());
|
|
}
|
|
|
|
// Find the node whose key compares equal to k in the bucket n. Return nullptr
|
|
// if no node is found.
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
|
|
_Equal, _H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Node*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_find_node(size_type __n, const key_type& __k,
|
|
typename _Hashtable::_Hash_code_type __code) const
|
|
{
|
|
_Node* __p = _M_bucket_begin(__n);
|
|
if (!__p)
|
|
return nullptr;
|
|
for (;; __p = __p->_M_next)
|
|
{
|
|
if (this->_M_compare(__k, __code, __p))
|
|
return __p;
|
|
if (!(__p->_M_next)
|
|
|| this->_M_bucket_index(__p->_M_next, _M_bucket_count) != __n)
|
|
break;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_insert_bucket_begin(size_type __bkt, _Node* __new_node)
|
|
{
|
|
_Node* __prev_n;
|
|
if (__bkt < _M_begin_bucket_index)
|
|
{
|
|
if (_M_begin_bucket_index != _M_bucket_count)
|
|
{
|
|
__new_node->_M_next = _M_buckets[_M_begin_bucket_index];
|
|
_M_buckets[_M_begin_bucket_index] = __new_node;
|
|
}
|
|
__prev_n = __new_node;
|
|
_M_begin_bucket_index = __bkt;
|
|
}
|
|
else
|
|
{
|
|
// We need to find previous non-empty bucket to link the new node.
|
|
// There are several ways to find this previous bucket:
|
|
// 1. Move backward until we find it (the current method)
|
|
// 2. Start from the begin bucket index and move forward until we
|
|
// cross __n position.
|
|
// 3. Move forward until we find a non-empty bucket that will
|
|
// contain the previous node.
|
|
size_type __prev_bkt;
|
|
for (__prev_bkt = __bkt; __prev_bkt-- != 0;)
|
|
if (_M_buckets[__prev_bkt])
|
|
break;
|
|
__prev_n = _M_bucket_end(__prev_bkt);
|
|
_M_insert_after(__prev_bkt, __prev_n, __new_node);
|
|
}
|
|
_M_buckets[__bkt] = __prev_n;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_insert_after(size_type __bkt, _Node* __prev_n, _Node* __new_n)
|
|
{
|
|
if (__prev_n->_M_next)
|
|
{
|
|
size_type __next_bkt =
|
|
this->_M_bucket_index(__prev_n->_M_next, _M_bucket_count);
|
|
if (__next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __new_n;
|
|
}
|
|
__new_n->_M_next = __prev_n->_M_next;
|
|
__prev_n->_M_next = __new_n;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_remove_bucket_begin(size_type __bkt, _Node* __next, size_type __next_bkt)
|
|
{
|
|
if (!__next || __next_bkt != __bkt)
|
|
{
|
|
// Bucket is now empty
|
|
if (__next && __next_bkt != __bkt)
|
|
// Update next non-empty bucket before begin node
|
|
_M_buckets[__next_bkt] = _M_buckets[__bkt];
|
|
_M_buckets[__bkt] = nullptr;
|
|
if (__bkt == _M_begin_bucket_index)
|
|
// We need to update begin bucket index
|
|
if (__next)
|
|
{
|
|
_M_begin_bucket_index = __next_bkt;
|
|
_M_buckets[_M_begin_bucket_index] = __next;
|
|
}
|
|
else
|
|
_M_begin_bucket_index = _M_bucket_count;
|
|
}
|
|
else if (__bkt == _M_begin_bucket_index)
|
|
_M_buckets[__bkt] = __next;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
|
|
_Equal, _H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::_Node*
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_get_previous_node(size_type __bkt, _Node* __n)
|
|
{
|
|
_Node* __prev_n = nullptr;
|
|
if (__bkt != _M_begin_bucket_index || __n != _M_buckets[__bkt])
|
|
{
|
|
__prev_n = _M_buckets[__bkt];
|
|
while (__prev_n->_M_next != __n)
|
|
__prev_n = __prev_n->_M_next;
|
|
}
|
|
return __prev_n;
|
|
}
|
|
|
|
// Insert v in bucket n (assumes no element with its key already present).
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename _Arg>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_insert_bucket(_Arg&& __v, size_type __n,
|
|
typename _Hashtable::_Hash_code_type __code)
|
|
{
|
|
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
|
|
std::pair<bool, std::size_t> __do_rehash
|
|
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
|
|
_M_element_count, 1);
|
|
|
|
if (__do_rehash.first)
|
|
{
|
|
const key_type& __k = this->_M_extract(__v);
|
|
__n = this->_M_bucket_index(__k, __code, __do_rehash.second);
|
|
}
|
|
|
|
_Node* __new_node = nullptr;
|
|
__try
|
|
{
|
|
// Allocate the new node before doing the rehash so that we
|
|
// don't do a rehash if the allocation throws.
|
|
__new_node = _M_allocate_node(std::forward<_Arg>(__v));
|
|
this->_M_store_code(__new_node, __code);
|
|
if (__do_rehash.first)
|
|
_M_rehash(__do_rehash.second, __saved_state);
|
|
|
|
if (_M_buckets[__n])
|
|
_M_insert_after(__n, _M_buckets[__n], __new_node);
|
|
else
|
|
_M_insert_bucket_begin(__n, __new_node);
|
|
++_M_element_count;
|
|
return iterator(__new_node);
|
|
}
|
|
__catch(...)
|
|
{
|
|
if (!__new_node)
|
|
_M_rehash_policy._M_reset(__saved_state);
|
|
else
|
|
_M_deallocate_node(__new_node);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
// Insert v if no element with its key is already present.
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename _Arg>
|
|
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
|
|
_ExtractKey, _Equal, _H1,
|
|
_H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator, bool>
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_insert(_Arg&& __v, std::true_type)
|
|
{
|
|
const key_type& __k = this->_M_extract(__v);
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
size_type __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
|
|
if (_Node* __p = _M_find_node(__n, __k, __code))
|
|
return std::make_pair(iterator(__p), false);
|
|
return std::make_pair(_M_insert_bucket(std::forward<_Arg>(__v),
|
|
__n, __code), true);
|
|
}
|
|
|
|
// Insert v unconditionally.
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename _Arg>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_insert(_Arg&& __v, std::false_type)
|
|
{
|
|
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
|
|
std::pair<bool, std::size_t> __do_rehash
|
|
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
|
|
_M_element_count, 1);
|
|
|
|
const key_type& __k = this->_M_extract(__v);
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
size_type __n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
|
|
// First find the node, avoid leaking new_node if compare throws.
|
|
_Node* __prev = _M_find_node(__n, __k, __code);
|
|
_Node* __new_node = nullptr;
|
|
__try
|
|
{
|
|
// Second allocate new node so that we don't rehash if it throws
|
|
__new_node = _M_allocate_node(std::forward<_Arg>(__v));
|
|
this->_M_store_code(__new_node, __code);
|
|
if (__do_rehash.first)
|
|
{
|
|
_M_rehash(__do_rehash.second, __saved_state);
|
|
__n = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
// __prev is still valid because rehash do not invalidate nodes
|
|
}
|
|
|
|
if (__prev)
|
|
// Insert after the previous equivalent node
|
|
_M_insert_after(__n, __prev, __new_node);
|
|
else if (_M_buckets[__n])
|
|
// Bucket is not empty and the inserted node has no equivalent in
|
|
// the hashtable. We must insert the new node at the beginning or
|
|
// end of the bucket to preserve equivalent elements relative
|
|
// positions.
|
|
if (__n != _M_begin_bucket_index)
|
|
// We insert the new node at the beginning
|
|
_M_insert_after(__n, _M_buckets[__n], __new_node);
|
|
else
|
|
// We insert the new node at the end
|
|
_M_insert_after(__n, _M_bucket_end(__n), __new_node);
|
|
else
|
|
_M_insert_bucket_begin(__n, __new_node);
|
|
++_M_element_count;
|
|
return iterator(__new_node);
|
|
}
|
|
__catch(...)
|
|
{
|
|
if (!__new_node)
|
|
_M_rehash_policy._M_reset(__saved_state);
|
|
else
|
|
_M_deallocate_node(__new_node);
|
|
__throw_exception_again;
|
|
}
|
|
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
template<typename _InputIterator>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
insert(_InputIterator __first, _InputIterator __last)
|
|
{
|
|
size_type __n_elt = __detail::__distance_fw(__first, __last);
|
|
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
|
|
std::pair<bool, std::size_t> __do_rehash
|
|
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
|
|
_M_element_count, __n_elt);
|
|
if (__do_rehash.first)
|
|
_M_rehash(__do_rehash.second, __saved_state);
|
|
|
|
for (; __first != __last; ++__first)
|
|
this->insert(*__first);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
erase(const_iterator __it)
|
|
{
|
|
_Node* __n = __it._M_cur;
|
|
std::size_t __bkt = this->_M_bucket_index(__n, _M_bucket_count);
|
|
|
|
// Look for previous node to unlink it from the erased one, this is why
|
|
// we need buckets to contain the before begin node of the bucket to make
|
|
// this research fast.
|
|
_Node* __prev_n = _M_get_previous_node(__bkt, __n);
|
|
if (__n == _M_bucket_begin(__bkt))
|
|
_M_remove_bucket_begin(__bkt, __n->_M_next,
|
|
__n->_M_next ? this->_M_bucket_index(__n->_M_next, _M_bucket_count)
|
|
: 0);
|
|
else if (__n->_M_next)
|
|
{
|
|
size_type __next_bkt =
|
|
this->_M_bucket_index(__n->_M_next, _M_bucket_count);
|
|
if (__next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __prev_n;
|
|
}
|
|
|
|
if (__prev_n)
|
|
__prev_n->_M_next = __n->_M_next;
|
|
iterator __result(__n->_M_next);
|
|
_M_deallocate_node(__n);
|
|
--_M_element_count;
|
|
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::size_type
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
erase(const key_type& __k)
|
|
{
|
|
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
|
|
std::size_t __bkt = this->_M_bucket_index(__k, __code, _M_bucket_count);
|
|
// Look for the first matching node with its previous node at the same
|
|
// time
|
|
_Node* __n = _M_buckets[__bkt];
|
|
if (!__n)
|
|
return 0;
|
|
_Node* __prev_n = nullptr;
|
|
if (__bkt != _M_begin_bucket_index)
|
|
{
|
|
__prev_n = __n;
|
|
__n = __n->_M_next;
|
|
}
|
|
bool __is_bucket_begin = true;
|
|
for (;; __prev_n = __n, __n = __n->_M_next)
|
|
{
|
|
if (this->_M_compare(__k, __code, __n))
|
|
break;
|
|
if (!(__n->_M_next)
|
|
|| this->_M_bucket_index(__n->_M_next, _M_bucket_count) != __bkt)
|
|
return 0;
|
|
__is_bucket_begin = false;
|
|
}
|
|
|
|
// We found a matching node, start deallocation loop from it
|
|
std::size_t __next_bkt = __bkt;
|
|
_Node* __next_n = __n;
|
|
size_type __result = 0;
|
|
_Node* __saved_n = nullptr;
|
|
do
|
|
{
|
|
_Node* __p = __next_n;
|
|
__next_n = __p->_M_next;
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 526. Is it undefined if a function in the standard changes
|
|
// in parameters?
|
|
if (std::__addressof(this->_M_extract(__p->_M_v))
|
|
!= std::__addressof(__k))
|
|
_M_deallocate_node(__p);
|
|
else
|
|
__saved_n = __p;
|
|
--_M_element_count;
|
|
++__result;
|
|
if (!__next_n)
|
|
break;
|
|
__next_bkt = this->_M_bucket_index(__next_n, _M_bucket_count);
|
|
}
|
|
while (__next_bkt == __bkt && this->_M_compare(__k, __code, __next_n));
|
|
|
|
if (__saved_n)
|
|
_M_deallocate_node(__saved_n);
|
|
if (__is_bucket_begin)
|
|
_M_remove_bucket_begin(__bkt, __next_n, __next_bkt);
|
|
else if (__next_n && __next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __prev_n;
|
|
if (__prev_n)
|
|
__prev_n->_M_next = __next_n;
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy,
|
|
__chc, __cit, __uk>::iterator
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
erase(const_iterator __first, const_iterator __last)
|
|
{
|
|
_Node* __n = __first._M_cur;
|
|
_Node* __last_n = __last._M_cur;
|
|
if (__n == __last_n)
|
|
return iterator(__n);
|
|
|
|
std::size_t __bkt = this->_M_bucket_index(__n, _M_bucket_count);
|
|
|
|
_Node* __prev_n = _M_get_previous_node(__bkt, __n);
|
|
bool __is_bucket_begin = __n == _M_bucket_begin(__bkt);
|
|
std::size_t __n_bkt = __bkt;
|
|
for (;;)
|
|
{
|
|
do
|
|
{
|
|
_Node* __tmp = __n;
|
|
__n = __n->_M_next;
|
|
_M_deallocate_node(__tmp);
|
|
--_M_element_count;
|
|
if (!__n)
|
|
break;
|
|
__n_bkt = this->_M_bucket_index(__n, _M_bucket_count);
|
|
}
|
|
while (__n != __last_n && __n_bkt == __bkt);
|
|
if (__is_bucket_begin)
|
|
_M_remove_bucket_begin(__bkt, __n, __n_bkt);
|
|
if (__n == __last_n)
|
|
break;
|
|
__is_bucket_begin = true;
|
|
__bkt = __n_bkt;
|
|
}
|
|
|
|
if (__n && __n_bkt != __bkt)
|
|
_M_buckets[__n_bkt] = __prev_n;
|
|
if (__prev_n)
|
|
__prev_n->_M_next = __n;
|
|
return iterator(__n);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
clear() noexcept
|
|
{
|
|
_M_deallocate_nodes(_M_buckets[_M_begin_bucket_index]);
|
|
__builtin_memset(_M_buckets, 0, _M_bucket_count * sizeof(_Bucket));
|
|
_M_element_count = 0;
|
|
_M_begin_bucket_index = _M_bucket_count;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
rehash(size_type __n)
|
|
{
|
|
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
|
|
_M_rehash(std::max(_M_rehash_policy._M_next_bkt(__n),
|
|
_M_rehash_policy._M_bkt_for_elements(_M_element_count
|
|
+ 1)),
|
|
__saved_state);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Allocator, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
bool __chc, bool __cit, bool __uk>
|
|
void
|
|
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
|
|
_M_rehash(size_type __n, const _RehashPolicyState& __state)
|
|
{
|
|
_Bucket* __new_buckets = nullptr;
|
|
_Node* __p = _M_buckets[_M_begin_bucket_index];
|
|
__try
|
|
{
|
|
__new_buckets = _M_allocate_buckets(__n);
|
|
// First loop to store each node in its new bucket
|
|
while (__p)
|
|
{
|
|
_Node* __next = __p->_M_next;
|
|
std::size_t __new_index = this->_M_bucket_index(__p, __n);
|
|
if (!__new_buckets[__new_index])
|
|
// Store temporarily bucket end node in _M_buckets if possible.
|
|
// This will boost second loop where we need to access bucket
|
|
// end node quickly.
|
|
if (__new_index < _M_bucket_count)
|
|
_M_buckets[__new_index] = __p;
|
|
__p->_M_next = __new_buckets[__new_index];
|
|
__new_buckets[__new_index] = __p;
|
|
__p = __next;
|
|
}
|
|
_M_begin_bucket_index = __n;
|
|
_Node* __prev_node = nullptr;
|
|
// Second loop to link all nodes together and to fix bucket values so
|
|
// that they contain the before begin node of the bucket.
|
|
for (size_type __i = 0; __i != __n; ++__i)
|
|
if (__new_buckets[__i])
|
|
{
|
|
if (__prev_node)
|
|
{
|
|
__prev_node->_M_next = __new_buckets[__i];
|
|
__new_buckets[__i] = __prev_node;
|
|
}
|
|
else
|
|
_M_begin_bucket_index = __i;
|
|
if (__i < _M_bucket_count)
|
|
__prev_node = _M_buckets[__i];
|
|
else
|
|
{
|
|
__prev_node = __new_buckets[__i];
|
|
while (__prev_node->_M_next)
|
|
__prev_node = __prev_node->_M_next;
|
|
}
|
|
}
|
|
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
|
|
_M_bucket_count = __n;
|
|
_M_buckets = __new_buckets;
|
|
}
|
|
__catch(...)
|
|
{
|
|
if (__new_buckets)
|
|
{
|
|
// A failure here means that a hash function threw an exception.
|
|
// We can't restore the previous state without calling the hash
|
|
// function again, so the only sensible recovery is to delete
|
|
// everything.
|
|
_M_deallocate_nodes(__new_buckets, __n);
|
|
_M_deallocate_buckets(__new_buckets, __n);
|
|
_M_deallocate_nodes(__p);
|
|
__builtin_memset(_M_buckets, 0, sizeof(_Bucket) * _M_bucket_count);
|
|
_M_element_count = 0;
|
|
_M_begin_bucket_index = _M_bucket_count;
|
|
_M_rehash_policy._M_reset(_RehashPolicyState());
|
|
}
|
|
else
|
|
// A failure here means that buckets allocation failed. We only
|
|
// have to restore hash policy previous state.
|
|
_M_rehash_policy._M_reset(__state);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // _HASHTABLE_H
|