mirror of git://gcc.gnu.org/git/gcc.git
2221 lines
72 KiB
C++
2221 lines
72 KiB
C++
// hashtable.h header -*- C++ -*-
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// Copyright (C) 2007-2019 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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#if __cplusplus > 201402L
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# include <bits/node_handle.h>
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#endif
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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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template<typename _Tp, typename _Hash>
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using __cache_default
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= __not_<__and_<// Do not cache for fast hasher.
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__is_fast_hash<_Hash>,
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// Mandatory to have erase not throwing.
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__is_nothrow_invocable<const _Hash&, const _Tp&>>>;
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/**
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* Primary class template _Hashtable.
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*
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* @ingroup hashtable-detail
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*
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* @tparam _Value CopyConstructible type.
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*
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* @tparam _Key CopyConstructible type.
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*
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* @tparam _Alloc An allocator type
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* ([lib.allocator.requirements]) whose _Alloc::value_type is
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* _Value. As a conforming extension, we allow for
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* _Alloc::value_type != _Value.
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*
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* @tparam _ExtractKey Function object that takes an object of type
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* _Value and returns a value of type _Key.
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*
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* @tparam _Equal Function object that takes two objects of type k
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* and returns a bool-like value that is true if the two objects
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* are considered equal.
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*
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* @tparam _H1 The hash function. A unary function object with
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* argument type _Key and result type size_t. Return values should
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* be distributed over the entire range [0, numeric_limits<size_t>:::max()].
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*
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* @tparam _H2 The range-hashing function (in the terminology of
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* Tavori and Dreizin). A binary function object whose argument
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* types and result type are all size_t. Given arguments r and N,
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* the return value is in the range [0, N).
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*
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* @tparam _Hash The ranged hash function (Tavori and Dreizin). A
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* binary function whose argument types are _Key and size_t and
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* whose result type is size_t. Given arguments k and N, the
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* return value is in the range [0, N). Default: hash(k, N) =
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* h2(h1(k), N). If _Hash is anything other than the default, _H1
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* and _H2 are ignored.
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*
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* @tparam _RehashPolicy Policy class with three members, all of
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* which govern the bucket count. _M_next_bkt(n) returns a bucket
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* count no smaller than n. _M_bkt_for_elements(n) returns a
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* bucket count appropriate for an element count of n.
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* _M_need_rehash(n_bkt, n_elt, n_ins) determines whether, if the
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* current bucket count is n_bkt and the current element count is
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* n_elt, we need to increase the bucket count. If so, returns
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* make_pair(true, n), where n is the new bucket count. If not,
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* returns make_pair(false, <anything>)
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*
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* @tparam _Traits Compile-time class with three boolean
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* std::integral_constant members: __cache_hash_code, __constant_iterators,
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* __unique_keys.
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*
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* Each _Hashtable data structure has:
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*
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* - _Bucket[] _M_buckets
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* - _Hash_node_base _M_before_begin
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* - size_type _M_bucket_count
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* - size_type _M_element_count
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*
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* with _Bucket being _Hash_node* and _Hash_node containing:
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*
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* - _Hash_node* _M_next
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* - Tp _M_value
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* - size_t _M_hash_code if cache_hash_code is true
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*
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* In terms of Standard containers the hashtable is like the aggregation of:
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*
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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 non-empty buckets contain the node before the first node in the
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* bucket. This design makes it possible to implement something like a
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* std::forward_list::insert_after on container insertion and
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* std::forward_list::erase_after on container erase
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* calls. _M_before_begin is equivalent to
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* std::forward_list::before_begin. Empty buckets contain
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* nullptr. Note that one of the non-empty buckets contains
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* &_M_before_begin which is not a dereferenceable node so the
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* node pointer in a bucket shall never be dereferenced, only its
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* next node can be.
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*
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* Walking through a bucket's nodes requires a check on the hash code to
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* see if each node is still in the bucket. Such a design assumes a
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* quite efficient hash functor and is one of the reasons it is
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* highly advisable to set __cache_hash_code to true.
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*
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* The container iterators are simply built from nodes. This way
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* incrementing the iterator is perfectly efficient independent of
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* how many empty buckets there are in the container.
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*
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* On insert we compute the element's hash code and use it to find the
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* bucket index. If the element must be inserted in an empty bucket
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* we add it at the beginning of the singly linked list and make the
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* bucket point to _M_before_begin. The bucket that used to point to
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* _M_before_begin, if any, is updated to point to its new before
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* begin node.
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*
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* On erase, the simple iterator design requires using the hash
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* functor to get the index of the bucket to update. For this
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* reason, when __cache_hash_code is set to false the hash functor must
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* not throw and this is enforced by a static assertion.
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*
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* Functionality is implemented by decomposition into base classes,
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* where the derived _Hashtable class is used in _Map_base,
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* _Insert, _Rehash_base, and _Equality base classes to access the
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* "this" pointer. _Hashtable_base is used in the base classes as a
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* non-recursive, fully-completed-type so that detailed nested type
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* information, such as iterator type and node type, can be
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* used. This is similar to the "Curiously Recurring Template
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* Pattern" (CRTP) technique, but uses a reconstructed, not
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* explicitly passed, template pattern.
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*
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* Base class templates are:
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* - __detail::_Hashtable_base
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* - __detail::_Map_base
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* - __detail::_Insert
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* - __detail::_Rehash_base
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* - __detail::_Equality
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*/
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template<typename _Key, typename _Value, typename _Alloc,
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typename _ExtractKey, typename _Equal,
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typename _H1, typename _H2, typename _Hash,
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typename _RehashPolicy, typename _Traits>
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class _Hashtable
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: public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
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_H1, _H2, _Hash, _Traits>,
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public __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, _Equal,
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_H1, _H2, _Hash, _RehashPolicy, _Traits>,
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public __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal,
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_H1, _H2, _Hash, _RehashPolicy, _Traits>,
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public __detail::_Rehash_base<_Key, _Value, _Alloc, _ExtractKey, _Equal,
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_H1, _H2, _Hash, _RehashPolicy, _Traits>,
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public __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal,
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_H1, _H2, _Hash, _RehashPolicy, _Traits>,
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private __detail::_Hashtable_alloc<
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__alloc_rebind<_Alloc,
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__detail::_Hash_node<_Value,
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_Traits::__hash_cached::value>>>
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{
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static_assert(is_same<typename remove_cv<_Value>::type, _Value>::value,
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"unordered container must have a non-const, non-volatile value_type");
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#ifdef __STRICT_ANSI__
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static_assert(is_same<typename _Alloc::value_type, _Value>{},
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"unordered container must have the same value_type as its allocator");
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#endif
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static_assert(__is_invocable<const _H1&, const _Key&>{},
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"hash function must be invocable with an argument of key type");
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static_assert(__is_invocable<const _Equal&, const _Key&, const _Key&>{},
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"key equality predicate must be invocable with two arguments of "
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"key type");
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using __traits_type = _Traits;
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using __hash_cached = typename __traits_type::__hash_cached;
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using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>;
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using __node_alloc_type = __alloc_rebind<_Alloc, __node_type>;
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using __hashtable_alloc = __detail::_Hashtable_alloc<__node_alloc_type>;
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using __value_alloc_traits =
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typename __hashtable_alloc::__value_alloc_traits;
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using __node_alloc_traits =
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typename __hashtable_alloc::__node_alloc_traits;
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using __node_base = typename __hashtable_alloc::__node_base;
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using __bucket_type = typename __hashtable_alloc::__bucket_type;
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public:
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typedef _Key key_type;
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typedef _Value value_type;
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typedef _Alloc allocator_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/_Hashtable_base.
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typedef typename __value_alloc_traits::pointer pointer;
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typedef typename __value_alloc_traits::const_pointer const_pointer;
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typedef value_type& reference;
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typedef const value_type& const_reference;
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private:
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using __rehash_type = _RehashPolicy;
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using __rehash_state = typename __rehash_type::_State;
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using __constant_iterators = typename __traits_type::__constant_iterators;
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using __unique_keys = typename __traits_type::__unique_keys;
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using __key_extract = typename std::conditional<
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__constant_iterators::value,
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__detail::_Identity,
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__detail::_Select1st>::type;
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using __hashtable_base = __detail::
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_Hashtable_base<_Key, _Value, _ExtractKey,
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_Equal, _H1, _H2, _Hash, _Traits>;
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using __hash_code_base = typename __hashtable_base::__hash_code_base;
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using __hash_code = typename __hashtable_base::__hash_code;
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using __ireturn_type = typename __hashtable_base::__ireturn_type;
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using __map_base = __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey,
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_Equal, _H1, _H2, _Hash,
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_RehashPolicy, _Traits>;
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using __rehash_base = __detail::_Rehash_base<_Key, _Value, _Alloc,
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_ExtractKey, _Equal,
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_H1, _H2, _Hash,
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_RehashPolicy, _Traits>;
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using __eq_base = __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey,
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_Equal, _H1, _H2, _Hash,
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_RehashPolicy, _Traits>;
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using __reuse_or_alloc_node_type =
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__detail::_ReuseOrAllocNode<__node_alloc_type>;
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// Metaprogramming for picking apart hash caching.
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template<typename _Cond>
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using __if_hash_cached = __or_<__not_<__hash_cached>, _Cond>;
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template<typename _Cond>
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using __if_hash_not_cached = __or_<__hash_cached, _Cond>;
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// Compile-time diagnostics.
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// _Hash_code_base has everything protected, so use this derived type to
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// access it.
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struct __hash_code_base_access : __hash_code_base
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{ using __hash_code_base::_M_bucket_index; };
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// Getting a bucket index from a node shall not throw because it is used
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// in methods (erase, swap...) that shall not throw.
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static_assert(noexcept(declval<const __hash_code_base_access&>()
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._M_bucket_index((const __node_type*)nullptr,
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(std::size_t)0)),
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"Cache the hash code or qualify your functors involved"
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" in hash code and bucket index computation with noexcept");
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// Following two static assertions are necessary to guarantee
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// that local_iterator will be default constructible.
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// When hash codes are cached local iterator inherits from H2 functor
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// which must then be default constructible.
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static_assert(__if_hash_cached<is_default_constructible<_H2>>::value,
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"Functor used to map hash code to bucket index"
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" must be default constructible");
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template<typename _Keya, typename _Valuea, typename _Alloca,
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typename _ExtractKeya, typename _Equala,
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typename _H1a, typename _H2a, typename _Hasha,
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typename _RehashPolicya, typename _Traitsa,
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bool _Unique_keysa>
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friend struct __detail::_Map_base;
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template<typename _Keya, typename _Valuea, typename _Alloca,
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typename _ExtractKeya, typename _Equala,
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typename _H1a, typename _H2a, typename _Hasha,
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typename _RehashPolicya, typename _Traitsa>
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friend struct __detail::_Insert_base;
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template<typename _Keya, typename _Valuea, typename _Alloca,
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typename _ExtractKeya, typename _Equala,
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typename _H1a, typename _H2a, typename _Hasha,
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typename _RehashPolicya, typename _Traitsa,
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bool _Constant_iteratorsa>
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friend struct __detail::_Insert;
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public:
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using size_type = typename __hashtable_base::size_type;
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using difference_type = typename __hashtable_base::difference_type;
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using iterator = typename __hashtable_base::iterator;
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using const_iterator = typename __hashtable_base::const_iterator;
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using local_iterator = typename __hashtable_base::local_iterator;
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using const_local_iterator = typename __hashtable_base::
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const_local_iterator;
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#if __cplusplus > 201402L
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using node_type = _Node_handle<_Key, _Value, __node_alloc_type>;
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using insert_return_type = _Node_insert_return<iterator, node_type>;
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#endif
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private:
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__bucket_type* _M_buckets = &_M_single_bucket;
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size_type _M_bucket_count = 1;
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__node_base _M_before_begin;
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size_type _M_element_count = 0;
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_RehashPolicy _M_rehash_policy;
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// A single bucket used when only need for 1 bucket. Especially
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// interesting in move semantic to leave hashtable with only 1 buckets
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// which is not allocated so that we can have those operations noexcept
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// qualified.
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// Note that we can't leave hashtable with 0 bucket without adding
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// numerous checks in the code to avoid 0 modulus.
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__bucket_type _M_single_bucket = nullptr;
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bool
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_M_uses_single_bucket(__bucket_type* __bkts) const
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{ return __builtin_expect(__bkts == &_M_single_bucket, false); }
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bool
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_M_uses_single_bucket() const
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{ return _M_uses_single_bucket(_M_buckets); }
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__hashtable_alloc&
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_M_base_alloc() { return *this; }
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__bucket_type*
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_M_allocate_buckets(size_type __n)
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{
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if (__builtin_expect(__n == 1, false))
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{
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_M_single_bucket = nullptr;
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return &_M_single_bucket;
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}
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return __hashtable_alloc::_M_allocate_buckets(__n);
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}
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void
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_M_deallocate_buckets(__bucket_type* __bkts, size_type __n)
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{
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if (_M_uses_single_bucket(__bkts))
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return;
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__hashtable_alloc::_M_deallocate_buckets(__bkts, __n);
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}
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void
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_M_deallocate_buckets()
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{ _M_deallocate_buckets(_M_buckets, _M_bucket_count); }
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// Gets bucket begin, deals with the fact that non-empty buckets contain
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// their before begin node.
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__node_type*
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_M_bucket_begin(size_type __bkt) const;
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__node_type*
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_M_begin() const
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{ return static_cast<__node_type*>(_M_before_begin._M_nxt); }
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// Assign *this using another _Hashtable instance. Either elements
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// are copy or move depends on the _NodeGenerator.
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template<typename _Ht, typename _NodeGenerator>
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void
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_M_assign_elements(_Ht&&, const _NodeGenerator&);
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template<typename _NodeGenerator>
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void
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_M_assign(const _Hashtable&, const _NodeGenerator&);
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void
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_M_move_assign(_Hashtable&&, std::true_type);
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void
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_M_move_assign(_Hashtable&&, std::false_type);
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void
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_M_reset() noexcept;
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_Hashtable(const _H1& __h1, const _H2& __h2, const _Hash& __h,
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const _Equal& __eq, const _ExtractKey& __exk,
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const allocator_type& __a)
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: __hashtable_base(__exk, __h1, __h2, __h, __eq),
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__hashtable_alloc(__node_alloc_type(__a))
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{ }
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public:
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// Constructor, destructor, assignment, swap
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_Hashtable() = default;
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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&&) noexcept;
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_Hashtable(const _Hashtable&, const allocator_type&);
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_Hashtable(_Hashtable&&, const allocator_type&);
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// Use delegating constructors.
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explicit
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_Hashtable(const allocator_type& __a)
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: __hashtable_alloc(__node_alloc_type(__a))
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{ }
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explicit
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_Hashtable(size_type __n,
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const _H1& __hf = _H1(),
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const key_equal& __eql = key_equal(),
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const allocator_type& __a = allocator_type())
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: _Hashtable(__n, __hf, _H2(), _Hash(), __eql,
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__key_extract(), __a)
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{ }
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template<typename _InputIterator>
|
|
_Hashtable(_InputIterator __f, _InputIterator __l,
|
|
size_type __n = 0,
|
|
const _H1& __hf = _H1(),
|
|
const key_equal& __eql = key_equal(),
|
|
const allocator_type& __a = allocator_type())
|
|
: _Hashtable(__f, __l, __n, __hf, _H2(), _Hash(), __eql,
|
|
__key_extract(), __a)
|
|
{ }
|
|
|
|
_Hashtable(initializer_list<value_type> __l,
|
|
size_type __n = 0,
|
|
const _H1& __hf = _H1(),
|
|
const key_equal& __eql = key_equal(),
|
|
const allocator_type& __a = allocator_type())
|
|
: _Hashtable(__l.begin(), __l.end(), __n, __hf, _H2(), _Hash(), __eql,
|
|
__key_extract(), __a)
|
|
{ }
|
|
|
|
_Hashtable&
|
|
operator=(const _Hashtable& __ht);
|
|
|
|
_Hashtable&
|
|
operator=(_Hashtable&& __ht)
|
|
noexcept(__node_alloc_traits::_S_nothrow_move()
|
|
&& is_nothrow_move_assignable<_H1>::value
|
|
&& is_nothrow_move_assignable<_Equal>::value)
|
|
{
|
|
constexpr bool __move_storage =
|
|
__node_alloc_traits::_S_propagate_on_move_assign()
|
|
|| __node_alloc_traits::_S_always_equal();
|
|
_M_move_assign(std::move(__ht), __bool_constant<__move_storage>());
|
|
return *this;
|
|
}
|
|
|
|
_Hashtable&
|
|
operator=(initializer_list<value_type> __l)
|
|
{
|
|
__reuse_or_alloc_node_type __roan(_M_begin(), *this);
|
|
_M_before_begin._M_nxt = nullptr;
|
|
clear();
|
|
this->_M_insert_range(__l.begin(), __l.end(), __roan, __unique_keys());
|
|
return *this;
|
|
}
|
|
|
|
~_Hashtable() noexcept;
|
|
|
|
void
|
|
swap(_Hashtable&)
|
|
noexcept(__and_<__is_nothrow_swappable<_H1>,
|
|
__is_nothrow_swappable<_Equal>>::value);
|
|
|
|
// Basic container operations
|
|
iterator
|
|
begin() noexcept
|
|
{ return iterator(_M_begin()); }
|
|
|
|
const_iterator
|
|
begin() const noexcept
|
|
{ return const_iterator(_M_begin()); }
|
|
|
|
iterator
|
|
end() noexcept
|
|
{ return iterator(nullptr); }
|
|
|
|
const_iterator
|
|
end() const noexcept
|
|
{ return const_iterator(nullptr); }
|
|
|
|
const_iterator
|
|
cbegin() const noexcept
|
|
{ return const_iterator(_M_begin()); }
|
|
|
|
const_iterator
|
|
cend() const noexcept
|
|
{ return const_iterator(nullptr); }
|
|
|
|
size_type
|
|
size() const noexcept
|
|
{ return _M_element_count; }
|
|
|
|
bool
|
|
empty() const noexcept
|
|
{ return size() == 0; }
|
|
|
|
allocator_type
|
|
get_allocator() const noexcept
|
|
{ return allocator_type(this->_M_node_allocator()); }
|
|
|
|
size_type
|
|
max_size() const noexcept
|
|
{ return __node_alloc_traits::max_size(this->_M_node_allocator()); }
|
|
|
|
// Observers
|
|
key_equal
|
|
key_eq() const
|
|
{ return this->_M_eq(); }
|
|
|
|
// hash_function, if present, comes from _Hash_code_base.
|
|
|
|
// Bucket operations
|
|
size_type
|
|
bucket_count() const noexcept
|
|
{ return _M_bucket_count; }
|
|
|
|
size_type
|
|
max_bucket_count() const noexcept
|
|
{ return max_size(); }
|
|
|
|
size_type
|
|
bucket_size(size_type __n) const
|
|
{ return std::distance(begin(__n), end(__n)); }
|
|
|
|
size_type
|
|
bucket(const key_type& __k) const
|
|
{ return _M_bucket_index(__k, this->_M_hash_code(__k)); }
|
|
|
|
local_iterator
|
|
begin(size_type __n)
|
|
{
|
|
return local_iterator(*this, _M_bucket_begin(__n),
|
|
__n, _M_bucket_count);
|
|
}
|
|
|
|
local_iterator
|
|
end(size_type __n)
|
|
{ return local_iterator(*this, nullptr, __n, _M_bucket_count); }
|
|
|
|
const_local_iterator
|
|
begin(size_type __n) const
|
|
{
|
|
return const_local_iterator(*this, _M_bucket_begin(__n),
|
|
__n, _M_bucket_count);
|
|
}
|
|
|
|
const_local_iterator
|
|
end(size_type __n) const
|
|
{ return const_local_iterator(*this, nullptr, __n, _M_bucket_count); }
|
|
|
|
// DR 691.
|
|
const_local_iterator
|
|
cbegin(size_type __n) const
|
|
{
|
|
return const_local_iterator(*this, _M_bucket_begin(__n),
|
|
__n, _M_bucket_count);
|
|
}
|
|
|
|
const_local_iterator
|
|
cend(size_type __n) const
|
|
{ return const_local_iterator(*this, nullptr, __n, _M_bucket_count); }
|
|
|
|
float
|
|
load_factor() const noexcept
|
|
{
|
|
return static_cast<float>(size()) / static_cast<float>(bucket_count());
|
|
}
|
|
|
|
// max_load_factor, if present, comes from _Rehash_base.
|
|
|
|
// Generalization of max_load_factor. Extension, not found in
|
|
// TR1. Only useful if _RehashPolicy is something other than
|
|
// the default.
|
|
const _RehashPolicy&
|
|
__rehash_policy() const
|
|
{ return _M_rehash_policy; }
|
|
|
|
void
|
|
__rehash_policy(const _RehashPolicy& __pol)
|
|
{ _M_rehash_policy = __pol; }
|
|
|
|
// Lookup.
|
|
iterator
|
|
find(const key_type& __k);
|
|
|
|
const_iterator
|
|
find(const key_type& __k) const;
|
|
|
|
size_type
|
|
count(const key_type& __k) const;
|
|
|
|
std::pair<iterator, iterator>
|
|
equal_range(const key_type& __k);
|
|
|
|
std::pair<const_iterator, const_iterator>
|
|
equal_range(const key_type& __k) const;
|
|
|
|
protected:
|
|
// Bucket index computation helpers.
|
|
size_type
|
|
_M_bucket_index(__node_type* __n) const noexcept
|
|
{ return __hash_code_base::_M_bucket_index(__n, _M_bucket_count); }
|
|
|
|
size_type
|
|
_M_bucket_index(const key_type& __k, __hash_code __c) const
|
|
{ return __hash_code_base::_M_bucket_index(__k, __c, _M_bucket_count); }
|
|
|
|
// Find and insert helper functions and types
|
|
// Find the node before the one matching the criteria.
|
|
__node_base*
|
|
_M_find_before_node(size_type, const key_type&, __hash_code) const;
|
|
|
|
__node_type*
|
|
_M_find_node(size_type __bkt, const key_type& __key,
|
|
__hash_code __c) const
|
|
{
|
|
__node_base* __before_n = _M_find_before_node(__bkt, __key, __c);
|
|
if (__before_n)
|
|
return static_cast<__node_type*>(__before_n->_M_nxt);
|
|
return nullptr;
|
|
}
|
|
|
|
// Insert a node at the beginning of a bucket.
|
|
void
|
|
_M_insert_bucket_begin(size_type, __node_type*);
|
|
|
|
// Remove the bucket first node
|
|
void
|
|
_M_remove_bucket_begin(size_type __bkt, __node_type* __next_n,
|
|
size_type __next_bkt);
|
|
|
|
// Get the node before __n in the bucket __bkt
|
|
__node_base*
|
|
_M_get_previous_node(size_type __bkt, __node_base* __n);
|
|
|
|
// Insert node with hash code __code, in bucket bkt if no rehash (assumes
|
|
// no element with its key already present). Take ownership of the node,
|
|
// deallocate it on exception.
|
|
iterator
|
|
_M_insert_unique_node(size_type __bkt, __hash_code __code,
|
|
__node_type* __n, size_type __n_elt = 1);
|
|
|
|
// Insert node with hash code __code. Take ownership of the node,
|
|
// deallocate it on exception.
|
|
iterator
|
|
_M_insert_multi_node(__node_type* __hint,
|
|
__hash_code __code, __node_type* __n);
|
|
|
|
template<typename... _Args>
|
|
std::pair<iterator, bool>
|
|
_M_emplace(std::true_type, _Args&&... __args);
|
|
|
|
template<typename... _Args>
|
|
iterator
|
|
_M_emplace(std::false_type __uk, _Args&&... __args)
|
|
{ return _M_emplace(cend(), __uk, std::forward<_Args>(__args)...); }
|
|
|
|
// Emplace with hint, useless when keys are unique.
|
|
template<typename... _Args>
|
|
iterator
|
|
_M_emplace(const_iterator, std::true_type __uk, _Args&&... __args)
|
|
{ return _M_emplace(__uk, std::forward<_Args>(__args)...).first; }
|
|
|
|
template<typename... _Args>
|
|
iterator
|
|
_M_emplace(const_iterator, std::false_type, _Args&&... __args);
|
|
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
std::pair<iterator, bool>
|
|
_M_insert(_Arg&&, const _NodeGenerator&, true_type, size_type = 1);
|
|
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
iterator
|
|
_M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen,
|
|
false_type __uk)
|
|
{
|
|
return _M_insert(cend(), std::forward<_Arg>(__arg), __node_gen,
|
|
__uk);
|
|
}
|
|
|
|
// Insert with hint, not used when keys are unique.
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
iterator
|
|
_M_insert(const_iterator, _Arg&& __arg,
|
|
const _NodeGenerator& __node_gen, true_type __uk)
|
|
{
|
|
return
|
|
_M_insert(std::forward<_Arg>(__arg), __node_gen, __uk).first;
|
|
}
|
|
|
|
// Insert with hint when keys are not unique.
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
iterator
|
|
_M_insert(const_iterator, _Arg&&,
|
|
const _NodeGenerator&, false_type);
|
|
|
|
size_type
|
|
_M_erase(std::true_type, const key_type&);
|
|
|
|
size_type
|
|
_M_erase(std::false_type, const key_type&);
|
|
|
|
iterator
|
|
_M_erase(size_type __bkt, __node_base* __prev_n, __node_type* __n);
|
|
|
|
public:
|
|
// Emplace
|
|
template<typename... _Args>
|
|
__ireturn_type
|
|
emplace(_Args&&... __args)
|
|
{ return _M_emplace(__unique_keys(), std::forward<_Args>(__args)...); }
|
|
|
|
template<typename... _Args>
|
|
iterator
|
|
emplace_hint(const_iterator __hint, _Args&&... __args)
|
|
{
|
|
return _M_emplace(__hint, __unique_keys(),
|
|
std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
// Insert member functions via inheritance.
|
|
|
|
// Erase
|
|
iterator
|
|
erase(const_iterator);
|
|
|
|
// LWG 2059.
|
|
iterator
|
|
erase(iterator __it)
|
|
{ return erase(const_iterator(__it)); }
|
|
|
|
size_type
|
|
erase(const key_type& __k)
|
|
{ return _M_erase(__unique_keys(), __k); }
|
|
|
|
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.
|
|
|
|
#if __cplusplus > 201402L
|
|
/// Re-insert an extracted node into a container with unique keys.
|
|
insert_return_type
|
|
_M_reinsert_node(node_type&& __nh)
|
|
{
|
|
insert_return_type __ret;
|
|
if (__nh.empty())
|
|
__ret.position = end();
|
|
else
|
|
{
|
|
__glibcxx_assert(get_allocator() == __nh.get_allocator());
|
|
|
|
const key_type& __k = __nh._M_key();
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
size_type __bkt = _M_bucket_index(__k, __code);
|
|
if (__node_type* __n = _M_find_node(__bkt, __k, __code))
|
|
{
|
|
__ret.node = std::move(__nh);
|
|
__ret.position = iterator(__n);
|
|
__ret.inserted = false;
|
|
}
|
|
else
|
|
{
|
|
__ret.position
|
|
= _M_insert_unique_node(__bkt, __code, __nh._M_ptr);
|
|
__nh._M_ptr = nullptr;
|
|
__ret.inserted = true;
|
|
}
|
|
}
|
|
return __ret;
|
|
}
|
|
|
|
/// Re-insert an extracted node into a container with equivalent keys.
|
|
iterator
|
|
_M_reinsert_node_multi(const_iterator __hint, node_type&& __nh)
|
|
{
|
|
iterator __ret;
|
|
if (__nh.empty())
|
|
__ret = end();
|
|
else
|
|
{
|
|
__glibcxx_assert(get_allocator() == __nh.get_allocator());
|
|
|
|
auto __code = this->_M_hash_code(__nh._M_key());
|
|
auto __node = std::exchange(__nh._M_ptr, nullptr);
|
|
// FIXME: this deallocates the node on exception.
|
|
__ret = _M_insert_multi_node(__hint._M_cur, __code, __node);
|
|
}
|
|
return __ret;
|
|
}
|
|
|
|
/// Extract a node.
|
|
node_type
|
|
extract(const_iterator __pos)
|
|
{
|
|
__node_type* __n = __pos._M_cur;
|
|
size_t __bkt = _M_bucket_index(__n);
|
|
|
|
// Look for previous node to unlink it from the erased one, this
|
|
// is why we need buckets to contain the before begin to make
|
|
// this search fast.
|
|
__node_base* __prev_n = _M_get_previous_node(__bkt, __n);
|
|
|
|
if (__prev_n == _M_buckets[__bkt])
|
|
_M_remove_bucket_begin(__bkt, __n->_M_next(),
|
|
__n->_M_nxt ? _M_bucket_index(__n->_M_next()) : 0);
|
|
else if (__n->_M_nxt)
|
|
{
|
|
size_type __next_bkt = _M_bucket_index(__n->_M_next());
|
|
if (__next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __prev_n;
|
|
}
|
|
|
|
__prev_n->_M_nxt = __n->_M_nxt;
|
|
__n->_M_nxt = nullptr;
|
|
--_M_element_count;
|
|
return { __n, this->_M_node_allocator() };
|
|
}
|
|
|
|
/// Extract a node.
|
|
node_type
|
|
extract(const _Key& __k)
|
|
{
|
|
node_type __nh;
|
|
auto __pos = find(__k);
|
|
if (__pos != end())
|
|
__nh = extract(const_iterator(__pos));
|
|
return __nh;
|
|
}
|
|
|
|
/// Merge from a compatible container into one with unique keys.
|
|
template<typename _Compatible_Hashtable>
|
|
void
|
|
_M_merge_unique(_Compatible_Hashtable& __src) noexcept
|
|
{
|
|
static_assert(is_same_v<typename _Compatible_Hashtable::node_type,
|
|
node_type>, "Node types are compatible");
|
|
__glibcxx_assert(get_allocator() == __src.get_allocator());
|
|
|
|
auto __n_elt = __src.size();
|
|
for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
|
|
{
|
|
auto __pos = __i++;
|
|
const key_type& __k = this->_M_extract()(__pos._M_cur->_M_v());
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
size_type __bkt = _M_bucket_index(__k, __code);
|
|
if (_M_find_node(__bkt, __k, __code) == nullptr)
|
|
{
|
|
auto __nh = __src.extract(__pos);
|
|
_M_insert_unique_node(__bkt, __code, __nh._M_ptr, __n_elt);
|
|
__nh._M_ptr = nullptr;
|
|
__n_elt = 1;
|
|
}
|
|
else if (__n_elt != 1)
|
|
--__n_elt;
|
|
}
|
|
}
|
|
|
|
/// Merge from a compatible container into one with equivalent keys.
|
|
template<typename _Compatible_Hashtable>
|
|
void
|
|
_M_merge_multi(_Compatible_Hashtable& __src) noexcept
|
|
{
|
|
static_assert(is_same_v<typename _Compatible_Hashtable::node_type,
|
|
node_type>, "Node types are compatible");
|
|
__glibcxx_assert(get_allocator() == __src.get_allocator());
|
|
|
|
this->reserve(size() + __src.size());
|
|
for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
|
|
_M_reinsert_node_multi(cend(), __src.extract(__i++));
|
|
}
|
|
#endif // C++17
|
|
|
|
private:
|
|
// Helper rehash method used when keys are unique.
|
|
void _M_rehash_aux(size_type __n, std::true_type);
|
|
|
|
// Helper rehash method used when keys can be non-unique.
|
|
void _M_rehash_aux(size_type __n, std::false_type);
|
|
|
|
// Unconditionally change size of bucket array to n, restore
|
|
// hash policy state to __state on exception.
|
|
void _M_rehash(size_type __n, const __rehash_state& __state);
|
|
};
|
|
|
|
|
|
// Definitions of class template _Hashtable's out-of-line member functions.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_bucket_begin(size_type __bkt) const
|
|
-> __node_type*
|
|
{
|
|
__node_base* __n = _M_buckets[__bkt];
|
|
return __n ? static_cast<__node_type*>(__n->_M_nxt) : nullptr;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_Hashtable(size_type __bucket_hint,
|
|
const _H1& __h1, const _H2& __h2, const _Hash& __h,
|
|
const _Equal& __eq, const _ExtractKey& __exk,
|
|
const allocator_type& __a)
|
|
: _Hashtable(__h1, __h2, __h, __eq, __exk, __a)
|
|
{
|
|
auto __bkt = _M_rehash_policy._M_next_bkt(__bucket_hint);
|
|
if (__bkt > _M_bucket_count)
|
|
{
|
|
_M_buckets = _M_allocate_buckets(__bkt);
|
|
_M_bucket_count = __bkt;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename _InputIterator>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_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)
|
|
: _Hashtable(__h1, __h2, __h, __eq, __exk, __a)
|
|
{
|
|
auto __nb_elems = __detail::__distance_fw(__f, __l);
|
|
auto __bkt_count =
|
|
_M_rehash_policy._M_next_bkt(
|
|
std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems),
|
|
__bucket_hint));
|
|
|
|
if (__bkt_count > _M_bucket_count)
|
|
{
|
|
_M_buckets = _M_allocate_buckets(__bkt_count);
|
|
_M_bucket_count = __bkt_count;
|
|
}
|
|
|
|
for (; __f != __l; ++__f)
|
|
this->insert(*__f);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
operator=(const _Hashtable& __ht)
|
|
-> _Hashtable&
|
|
{
|
|
if (&__ht == this)
|
|
return *this;
|
|
|
|
if (__node_alloc_traits::_S_propagate_on_copy_assign())
|
|
{
|
|
auto& __this_alloc = this->_M_node_allocator();
|
|
auto& __that_alloc = __ht._M_node_allocator();
|
|
if (!__node_alloc_traits::_S_always_equal()
|
|
&& __this_alloc != __that_alloc)
|
|
{
|
|
// Replacement allocator cannot free existing storage.
|
|
this->_M_deallocate_nodes(_M_begin());
|
|
_M_before_begin._M_nxt = nullptr;
|
|
_M_deallocate_buckets();
|
|
_M_buckets = nullptr;
|
|
std::__alloc_on_copy(__this_alloc, __that_alloc);
|
|
__hashtable_base::operator=(__ht);
|
|
_M_bucket_count = __ht._M_bucket_count;
|
|
_M_element_count = __ht._M_element_count;
|
|
_M_rehash_policy = __ht._M_rehash_policy;
|
|
__try
|
|
{
|
|
_M_assign(__ht,
|
|
[this](const __node_type* __n)
|
|
{ return this->_M_allocate_node(__n->_M_v()); });
|
|
}
|
|
__catch(...)
|
|
{
|
|
// _M_assign took care of deallocating all memory. Now we
|
|
// must make sure this instance remains in a usable state.
|
|
_M_reset();
|
|
__throw_exception_again;
|
|
}
|
|
return *this;
|
|
}
|
|
std::__alloc_on_copy(__this_alloc, __that_alloc);
|
|
}
|
|
|
|
// Reuse allocated buckets and nodes.
|
|
_M_assign_elements(__ht,
|
|
[](const __reuse_or_alloc_node_type& __roan, const __node_type* __n)
|
|
{ return __roan(__n->_M_v()); });
|
|
return *this;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename _Ht, typename _NodeGenerator>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_assign_elements(_Ht&& __ht, const _NodeGenerator& __node_gen)
|
|
{
|
|
__bucket_type* __former_buckets = nullptr;
|
|
std::size_t __former_bucket_count = _M_bucket_count;
|
|
const __rehash_state& __former_state = _M_rehash_policy._M_state();
|
|
|
|
if (_M_bucket_count != __ht._M_bucket_count)
|
|
{
|
|
__former_buckets = _M_buckets;
|
|
_M_buckets = _M_allocate_buckets(__ht._M_bucket_count);
|
|
_M_bucket_count = __ht._M_bucket_count;
|
|
}
|
|
else
|
|
__builtin_memset(_M_buckets, 0,
|
|
_M_bucket_count * sizeof(__bucket_type));
|
|
|
|
__try
|
|
{
|
|
__hashtable_base::operator=(std::forward<_Ht>(__ht));
|
|
_M_element_count = __ht._M_element_count;
|
|
_M_rehash_policy = __ht._M_rehash_policy;
|
|
__reuse_or_alloc_node_type __roan(_M_begin(), *this);
|
|
_M_before_begin._M_nxt = nullptr;
|
|
_M_assign(__ht,
|
|
[&__node_gen, &__roan](__node_type* __n)
|
|
{ return __node_gen(__roan, __n); });
|
|
if (__former_buckets)
|
|
_M_deallocate_buckets(__former_buckets, __former_bucket_count);
|
|
}
|
|
__catch(...)
|
|
{
|
|
if (__former_buckets)
|
|
{
|
|
// Restore previous buckets.
|
|
_M_deallocate_buckets();
|
|
_M_rehash_policy._M_reset(__former_state);
|
|
_M_buckets = __former_buckets;
|
|
_M_bucket_count = __former_bucket_count;
|
|
}
|
|
__builtin_memset(_M_buckets, 0,
|
|
_M_bucket_count * sizeof(__bucket_type));
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename _NodeGenerator>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_assign(const _Hashtable& __ht, const _NodeGenerator& __node_gen)
|
|
{
|
|
__bucket_type* __buckets = nullptr;
|
|
if (!_M_buckets)
|
|
_M_buckets = __buckets = _M_allocate_buckets(_M_bucket_count);
|
|
|
|
__try
|
|
{
|
|
if (!__ht._M_before_begin._M_nxt)
|
|
return;
|
|
|
|
// First deal with the special first node pointed to by
|
|
// _M_before_begin.
|
|
__node_type* __ht_n = __ht._M_begin();
|
|
__node_type* __this_n = __node_gen(__ht_n);
|
|
this->_M_copy_code(__this_n, __ht_n);
|
|
_M_before_begin._M_nxt = __this_n;
|
|
_M_buckets[_M_bucket_index(__this_n)] = &_M_before_begin;
|
|
|
|
// Then deal with other nodes.
|
|
__node_base* __prev_n = __this_n;
|
|
for (__ht_n = __ht_n->_M_next(); __ht_n; __ht_n = __ht_n->_M_next())
|
|
{
|
|
__this_n = __node_gen(__ht_n);
|
|
__prev_n->_M_nxt = __this_n;
|
|
this->_M_copy_code(__this_n, __ht_n);
|
|
size_type __bkt = _M_bucket_index(__this_n);
|
|
if (!_M_buckets[__bkt])
|
|
_M_buckets[__bkt] = __prev_n;
|
|
__prev_n = __this_n;
|
|
}
|
|
}
|
|
__catch(...)
|
|
{
|
|
clear();
|
|
if (__buckets)
|
|
_M_deallocate_buckets();
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_reset() noexcept
|
|
{
|
|
_M_rehash_policy._M_reset();
|
|
_M_bucket_count = 1;
|
|
_M_single_bucket = nullptr;
|
|
_M_buckets = &_M_single_bucket;
|
|
_M_before_begin._M_nxt = nullptr;
|
|
_M_element_count = 0;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_move_assign(_Hashtable&& __ht, std::true_type)
|
|
{
|
|
this->_M_deallocate_nodes(_M_begin());
|
|
_M_deallocate_buckets();
|
|
__hashtable_base::operator=(std::move(__ht));
|
|
_M_rehash_policy = __ht._M_rehash_policy;
|
|
if (!__ht._M_uses_single_bucket())
|
|
_M_buckets = __ht._M_buckets;
|
|
else
|
|
{
|
|
_M_buckets = &_M_single_bucket;
|
|
_M_single_bucket = __ht._M_single_bucket;
|
|
}
|
|
_M_bucket_count = __ht._M_bucket_count;
|
|
_M_before_begin._M_nxt = __ht._M_before_begin._M_nxt;
|
|
_M_element_count = __ht._M_element_count;
|
|
std::__alloc_on_move(this->_M_node_allocator(), __ht._M_node_allocator());
|
|
|
|
// Fix buckets containing the _M_before_begin pointers that can't be
|
|
// moved.
|
|
if (_M_begin())
|
|
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
|
|
__ht._M_reset();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_move_assign(_Hashtable&& __ht, std::false_type)
|
|
{
|
|
if (__ht._M_node_allocator() == this->_M_node_allocator())
|
|
_M_move_assign(std::move(__ht), std::true_type());
|
|
else
|
|
{
|
|
// Can't move memory, move elements then.
|
|
_M_assign_elements(std::move(__ht),
|
|
[](const __reuse_or_alloc_node_type& __roan, __node_type* __n)
|
|
{ return __roan(std::move_if_noexcept(__n->_M_v())); });
|
|
__ht.clear();
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_Hashtable(const _Hashtable& __ht)
|
|
: __hashtable_base(__ht),
|
|
__map_base(__ht),
|
|
__rehash_base(__ht),
|
|
__hashtable_alloc(
|
|
__node_alloc_traits::_S_select_on_copy(__ht._M_node_allocator())),
|
|
_M_buckets(nullptr),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
_M_assign(__ht,
|
|
[this](const __node_type* __n)
|
|
{ return this->_M_allocate_node(__n->_M_v()); });
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_Hashtable(_Hashtable&& __ht) noexcept
|
|
: __hashtable_base(__ht),
|
|
__map_base(__ht),
|
|
__rehash_base(__ht),
|
|
__hashtable_alloc(std::move(__ht._M_base_alloc())),
|
|
_M_buckets(__ht._M_buckets),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_before_begin(__ht._M_before_begin._M_nxt),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
// Update, if necessary, buckets if __ht is using its single bucket.
|
|
if (__ht._M_uses_single_bucket())
|
|
{
|
|
_M_buckets = &_M_single_bucket;
|
|
_M_single_bucket = __ht._M_single_bucket;
|
|
}
|
|
|
|
// Update, if necessary, bucket pointing to before begin that hasn't
|
|
// moved.
|
|
if (_M_begin())
|
|
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
|
|
|
|
__ht._M_reset();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_Hashtable(const _Hashtable& __ht, const allocator_type& __a)
|
|
: __hashtable_base(__ht),
|
|
__map_base(__ht),
|
|
__rehash_base(__ht),
|
|
__hashtable_alloc(__node_alloc_type(__a)),
|
|
_M_buckets(),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
_M_assign(__ht,
|
|
[this](const __node_type* __n)
|
|
{ return this->_M_allocate_node(__n->_M_v()); });
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_Hashtable(_Hashtable&& __ht, const allocator_type& __a)
|
|
: __hashtable_base(__ht),
|
|
__map_base(__ht),
|
|
__rehash_base(__ht),
|
|
__hashtable_alloc(__node_alloc_type(__a)),
|
|
_M_buckets(nullptr),
|
|
_M_bucket_count(__ht._M_bucket_count),
|
|
_M_element_count(__ht._M_element_count),
|
|
_M_rehash_policy(__ht._M_rehash_policy)
|
|
{
|
|
if (__ht._M_node_allocator() == this->_M_node_allocator())
|
|
{
|
|
if (__ht._M_uses_single_bucket())
|
|
{
|
|
_M_buckets = &_M_single_bucket;
|
|
_M_single_bucket = __ht._M_single_bucket;
|
|
}
|
|
else
|
|
_M_buckets = __ht._M_buckets;
|
|
|
|
_M_before_begin._M_nxt = __ht._M_before_begin._M_nxt;
|
|
// Update, if necessary, bucket pointing to before begin that hasn't
|
|
// moved.
|
|
if (_M_begin())
|
|
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
|
|
__ht._M_reset();
|
|
}
|
|
else
|
|
{
|
|
_M_assign(__ht,
|
|
[this](__node_type* __n)
|
|
{
|
|
return this->_M_allocate_node(
|
|
std::move_if_noexcept(__n->_M_v()));
|
|
});
|
|
__ht.clear();
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
~_Hashtable() noexcept
|
|
{
|
|
clear();
|
|
_M_deallocate_buckets();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
swap(_Hashtable& __x)
|
|
noexcept(__and_<__is_nothrow_swappable<_H1>,
|
|
__is_nothrow_swappable<_Equal>>::value)
|
|
{
|
|
// The only base class with member variables is hash_code_base.
|
|
// We define _Hash_code_base::_M_swap because different
|
|
// specializations have different members.
|
|
this->_M_swap(__x);
|
|
|
|
std::__alloc_on_swap(this->_M_node_allocator(), __x._M_node_allocator());
|
|
std::swap(_M_rehash_policy, __x._M_rehash_policy);
|
|
|
|
// Deal properly with potentially moved instances.
|
|
if (this->_M_uses_single_bucket())
|
|
{
|
|
if (!__x._M_uses_single_bucket())
|
|
{
|
|
_M_buckets = __x._M_buckets;
|
|
__x._M_buckets = &__x._M_single_bucket;
|
|
}
|
|
}
|
|
else if (__x._M_uses_single_bucket())
|
|
{
|
|
__x._M_buckets = _M_buckets;
|
|
_M_buckets = &_M_single_bucket;
|
|
}
|
|
else
|
|
std::swap(_M_buckets, __x._M_buckets);
|
|
|
|
std::swap(_M_bucket_count, __x._M_bucket_count);
|
|
std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt);
|
|
std::swap(_M_element_count, __x._M_element_count);
|
|
std::swap(_M_single_bucket, __x._M_single_bucket);
|
|
|
|
// Fix buckets containing the _M_before_begin pointers that can't be
|
|
// swapped.
|
|
if (_M_begin())
|
|
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
|
|
|
|
if (__x._M_begin())
|
|
__x._M_buckets[__x._M_bucket_index(__x._M_begin())]
|
|
= &__x._M_before_begin;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
find(const key_type& __k)
|
|
-> iterator
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __n = _M_bucket_index(__k, __code);
|
|
__node_type* __p = _M_find_node(__n, __k, __code);
|
|
return __p ? iterator(__p) : end();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
find(const key_type& __k) const
|
|
-> const_iterator
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __n = _M_bucket_index(__k, __code);
|
|
__node_type* __p = _M_find_node(__n, __k, __code);
|
|
return __p ? const_iterator(__p) : end();
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
count(const key_type& __k) const
|
|
-> size_type
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __n = _M_bucket_index(__k, __code);
|
|
__node_type* __p = _M_bucket_begin(__n);
|
|
if (!__p)
|
|
return 0;
|
|
|
|
std::size_t __result = 0;
|
|
for (;; __p = __p->_M_next())
|
|
{
|
|
if (this->_M_equals(__k, __code, __p))
|
|
++__result;
|
|
else if (__result)
|
|
// All equivalent values are next to each other, if we
|
|
// found a non-equivalent value after an equivalent one it
|
|
// means that we won't find any new equivalent value.
|
|
break;
|
|
if (!__p->_M_nxt || _M_bucket_index(__p->_M_next()) != __n)
|
|
break;
|
|
}
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
equal_range(const key_type& __k)
|
|
-> pair<iterator, iterator>
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __n = _M_bucket_index(__k, __code);
|
|
__node_type* __p = _M_find_node(__n, __k, __code);
|
|
|
|
if (__p)
|
|
{
|
|
__node_type* __p1 = __p->_M_next();
|
|
while (__p1 && _M_bucket_index(__p1) == __n
|
|
&& this->_M_equals(__k, __code, __p1))
|
|
__p1 = __p1->_M_next();
|
|
|
|
return std::make_pair(iterator(__p), iterator(__p1));
|
|
}
|
|
else
|
|
return std::make_pair(end(), end());
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
equal_range(const key_type& __k) const
|
|
-> pair<const_iterator, const_iterator>
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __n = _M_bucket_index(__k, __code);
|
|
__node_type* __p = _M_find_node(__n, __k, __code);
|
|
|
|
if (__p)
|
|
{
|
|
__node_type* __p1 = __p->_M_next();
|
|
while (__p1 && _M_bucket_index(__p1) == __n
|
|
&& this->_M_equals(__k, __code, __p1))
|
|
__p1 = __p1->_M_next();
|
|
|
|
return std::make_pair(const_iterator(__p), const_iterator(__p1));
|
|
}
|
|
else
|
|
return std::make_pair(end(), 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 _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_find_before_node(size_type __n, const key_type& __k,
|
|
__hash_code __code) const
|
|
-> __node_base*
|
|
{
|
|
__node_base* __prev_p = _M_buckets[__n];
|
|
if (!__prev_p)
|
|
return nullptr;
|
|
|
|
for (__node_type* __p = static_cast<__node_type*>(__prev_p->_M_nxt);;
|
|
__p = __p->_M_next())
|
|
{
|
|
if (this->_M_equals(__k, __code, __p))
|
|
return __prev_p;
|
|
|
|
if (!__p->_M_nxt || _M_bucket_index(__p->_M_next()) != __n)
|
|
break;
|
|
__prev_p = __p;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_insert_bucket_begin(size_type __bkt, __node_type* __node)
|
|
{
|
|
if (_M_buckets[__bkt])
|
|
{
|
|
// Bucket is not empty, we just need to insert the new node
|
|
// after the bucket before begin.
|
|
__node->_M_nxt = _M_buckets[__bkt]->_M_nxt;
|
|
_M_buckets[__bkt]->_M_nxt = __node;
|
|
}
|
|
else
|
|
{
|
|
// The bucket is empty, the new node is inserted at the
|
|
// beginning of the singly-linked list and the bucket will
|
|
// contain _M_before_begin pointer.
|
|
__node->_M_nxt = _M_before_begin._M_nxt;
|
|
_M_before_begin._M_nxt = __node;
|
|
if (__node->_M_nxt)
|
|
// We must update former begin bucket that is pointing to
|
|
// _M_before_begin.
|
|
_M_buckets[_M_bucket_index(__node->_M_next())] = __node;
|
|
_M_buckets[__bkt] = &_M_before_begin;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_remove_bucket_begin(size_type __bkt, __node_type* __next,
|
|
size_type __next_bkt)
|
|
{
|
|
if (!__next || __next_bkt != __bkt)
|
|
{
|
|
// Bucket is now empty
|
|
// First update next bucket if any
|
|
if (__next)
|
|
_M_buckets[__next_bkt] = _M_buckets[__bkt];
|
|
|
|
// Second update before begin node if necessary
|
|
if (&_M_before_begin == _M_buckets[__bkt])
|
|
_M_before_begin._M_nxt = __next;
|
|
_M_buckets[__bkt] = nullptr;
|
|
}
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_get_previous_node(size_type __bkt, __node_base* __n)
|
|
-> __node_base*
|
|
{
|
|
__node_base* __prev_n = _M_buckets[__bkt];
|
|
while (__prev_n->_M_nxt != __n)
|
|
__prev_n = __prev_n->_M_nxt;
|
|
return __prev_n;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename... _Args>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_emplace(std::true_type, _Args&&... __args)
|
|
-> pair<iterator, bool>
|
|
{
|
|
// First build the node to get access to the hash code
|
|
__node_type* __node = this->_M_allocate_node(std::forward<_Args>(__args)...);
|
|
const key_type& __k = this->_M_extract()(__node->_M_v());
|
|
__hash_code __code;
|
|
__try
|
|
{
|
|
__code = this->_M_hash_code(__k);
|
|
}
|
|
__catch(...)
|
|
{
|
|
this->_M_deallocate_node(__node);
|
|
__throw_exception_again;
|
|
}
|
|
|
|
size_type __bkt = _M_bucket_index(__k, __code);
|
|
if (__node_type* __p = _M_find_node(__bkt, __k, __code))
|
|
{
|
|
// There is already an equivalent node, no insertion
|
|
this->_M_deallocate_node(__node);
|
|
return std::make_pair(iterator(__p), false);
|
|
}
|
|
|
|
// Insert the node
|
|
return std::make_pair(_M_insert_unique_node(__bkt, __code, __node),
|
|
true);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename... _Args>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_emplace(const_iterator __hint, std::false_type, _Args&&... __args)
|
|
-> iterator
|
|
{
|
|
// First build the node to get its hash code.
|
|
__node_type* __node =
|
|
this->_M_allocate_node(std::forward<_Args>(__args)...);
|
|
|
|
__hash_code __code;
|
|
__try
|
|
{
|
|
__code = this->_M_hash_code(this->_M_extract()(__node->_M_v()));
|
|
}
|
|
__catch(...)
|
|
{
|
|
this->_M_deallocate_node(__node);
|
|
__throw_exception_again;
|
|
}
|
|
|
|
return _M_insert_multi_node(__hint._M_cur, __code, __node);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_insert_unique_node(size_type __bkt, __hash_code __code,
|
|
__node_type* __node, size_type __n_elt)
|
|
-> iterator
|
|
{
|
|
const __rehash_state& __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);
|
|
|
|
__try
|
|
{
|
|
if (__do_rehash.first)
|
|
{
|
|
_M_rehash(__do_rehash.second, __saved_state);
|
|
__bkt = _M_bucket_index(this->_M_extract()(__node->_M_v()), __code);
|
|
}
|
|
|
|
this->_M_store_code(__node, __code);
|
|
|
|
// Always insert at the beginning of the bucket.
|
|
_M_insert_bucket_begin(__bkt, __node);
|
|
++_M_element_count;
|
|
return iterator(__node);
|
|
}
|
|
__catch(...)
|
|
{
|
|
this->_M_deallocate_node(__node);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
// Insert node, in bucket bkt if no rehash (assumes no element with its key
|
|
// already present). Take ownership of the node, deallocate it on exception.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_insert_multi_node(__node_type* __hint, __hash_code __code,
|
|
__node_type* __node)
|
|
-> iterator
|
|
{
|
|
const __rehash_state& __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);
|
|
|
|
__try
|
|
{
|
|
if (__do_rehash.first)
|
|
_M_rehash(__do_rehash.second, __saved_state);
|
|
|
|
this->_M_store_code(__node, __code);
|
|
const key_type& __k = this->_M_extract()(__node->_M_v());
|
|
size_type __bkt = _M_bucket_index(__k, __code);
|
|
|
|
// Find the node before an equivalent one or use hint if it exists and
|
|
// if it is equivalent.
|
|
__node_base* __prev
|
|
= __builtin_expect(__hint != nullptr, false)
|
|
&& this->_M_equals(__k, __code, __hint)
|
|
? __hint
|
|
: _M_find_before_node(__bkt, __k, __code);
|
|
if (__prev)
|
|
{
|
|
// Insert after the node before the equivalent one.
|
|
__node->_M_nxt = __prev->_M_nxt;
|
|
__prev->_M_nxt = __node;
|
|
if (__builtin_expect(__prev == __hint, false))
|
|
// hint might be the last bucket node, in this case we need to
|
|
// update next bucket.
|
|
if (__node->_M_nxt
|
|
&& !this->_M_equals(__k, __code, __node->_M_next()))
|
|
{
|
|
size_type __next_bkt = _M_bucket_index(__node->_M_next());
|
|
if (__next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __node;
|
|
}
|
|
}
|
|
else
|
|
// The inserted node has no equivalent in the
|
|
// hashtable. We must insert the new node at the
|
|
// beginning of the bucket to preserve equivalent
|
|
// elements' relative positions.
|
|
_M_insert_bucket_begin(__bkt, __node);
|
|
++_M_element_count;
|
|
return iterator(__node);
|
|
}
|
|
__catch(...)
|
|
{
|
|
this->_M_deallocate_node(__node);
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
// Insert v if no element with its key is already present.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_insert(_Arg&& __v, const _NodeGenerator& __node_gen, true_type,
|
|
size_type __n_elt)
|
|
-> pair<iterator, bool>
|
|
{
|
|
const key_type& __k = this->_M_extract()(__v);
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
size_type __bkt = _M_bucket_index(__k, __code);
|
|
|
|
__node_type* __n = _M_find_node(__bkt, __k, __code);
|
|
if (__n)
|
|
return std::make_pair(iterator(__n), false);
|
|
|
|
__n = __node_gen(std::forward<_Arg>(__v));
|
|
return { _M_insert_unique_node(__bkt, __code, __n, __n_elt), true };
|
|
}
|
|
|
|
// Insert v unconditionally.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
template<typename _Arg, typename _NodeGenerator>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_insert(const_iterator __hint, _Arg&& __v,
|
|
const _NodeGenerator& __node_gen, false_type)
|
|
-> iterator
|
|
{
|
|
// First compute the hash code so that we don't do anything if it
|
|
// throws.
|
|
__hash_code __code = this->_M_hash_code(this->_M_extract()(__v));
|
|
|
|
// Second allocate new node so that we don't rehash if it throws.
|
|
__node_type* __node = __node_gen(std::forward<_Arg>(__v));
|
|
|
|
return _M_insert_multi_node(__hint._M_cur, __code, __node);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
erase(const_iterator __it)
|
|
-> iterator
|
|
{
|
|
__node_type* __n = __it._M_cur;
|
|
std::size_t __bkt = _M_bucket_index(__n);
|
|
|
|
// Look for previous node to unlink it from the erased one, this
|
|
// is why we need buckets to contain the before begin to make
|
|
// this search fast.
|
|
__node_base* __prev_n = _M_get_previous_node(__bkt, __n);
|
|
return _M_erase(__bkt, __prev_n, __n);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_erase(size_type __bkt, __node_base* __prev_n, __node_type* __n)
|
|
-> iterator
|
|
{
|
|
if (__prev_n == _M_buckets[__bkt])
|
|
_M_remove_bucket_begin(__bkt, __n->_M_next(),
|
|
__n->_M_nxt ? _M_bucket_index(__n->_M_next()) : 0);
|
|
else if (__n->_M_nxt)
|
|
{
|
|
size_type __next_bkt = _M_bucket_index(__n->_M_next());
|
|
if (__next_bkt != __bkt)
|
|
_M_buckets[__next_bkt] = __prev_n;
|
|
}
|
|
|
|
__prev_n->_M_nxt = __n->_M_nxt;
|
|
iterator __result(__n->_M_next());
|
|
this->_M_deallocate_node(__n);
|
|
--_M_element_count;
|
|
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_erase(std::true_type, const key_type& __k)
|
|
-> size_type
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __bkt = _M_bucket_index(__k, __code);
|
|
|
|
// Look for the node before the first matching node.
|
|
__node_base* __prev_n = _M_find_before_node(__bkt, __k, __code);
|
|
if (!__prev_n)
|
|
return 0;
|
|
|
|
// We found a matching node, erase it.
|
|
__node_type* __n = static_cast<__node_type*>(__prev_n->_M_nxt);
|
|
_M_erase(__bkt, __prev_n, __n);
|
|
return 1;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_erase(std::false_type, const key_type& __k)
|
|
-> size_type
|
|
{
|
|
__hash_code __code = this->_M_hash_code(__k);
|
|
std::size_t __bkt = _M_bucket_index(__k, __code);
|
|
|
|
// Look for the node before the first matching node.
|
|
__node_base* __prev_n = _M_find_before_node(__bkt, __k, __code);
|
|
if (!__prev_n)
|
|
return 0;
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 526. Is it undefined if a function in the standard changes
|
|
// in parameters?
|
|
// We use one loop to find all matching nodes and another to deallocate
|
|
// them so that the key stays valid during the first loop. It might be
|
|
// invalidated indirectly when destroying nodes.
|
|
__node_type* __n = static_cast<__node_type*>(__prev_n->_M_nxt);
|
|
__node_type* __n_last = __n;
|
|
std::size_t __n_last_bkt = __bkt;
|
|
do
|
|
{
|
|
__n_last = __n_last->_M_next();
|
|
if (!__n_last)
|
|
break;
|
|
__n_last_bkt = _M_bucket_index(__n_last);
|
|
}
|
|
while (__n_last_bkt == __bkt && this->_M_equals(__k, __code, __n_last));
|
|
|
|
// Deallocate nodes.
|
|
size_type __result = 0;
|
|
do
|
|
{
|
|
__node_type* __p = __n->_M_next();
|
|
this->_M_deallocate_node(__n);
|
|
__n = __p;
|
|
++__result;
|
|
--_M_element_count;
|
|
}
|
|
while (__n != __n_last);
|
|
|
|
if (__prev_n == _M_buckets[__bkt])
|
|
_M_remove_bucket_begin(__bkt, __n_last, __n_last_bkt);
|
|
else if (__n_last && __n_last_bkt != __bkt)
|
|
_M_buckets[__n_last_bkt] = __prev_n;
|
|
__prev_n->_M_nxt = __n_last;
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
auto
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
erase(const_iterator __first, const_iterator __last)
|
|
-> iterator
|
|
{
|
|
__node_type* __n = __first._M_cur;
|
|
__node_type* __last_n = __last._M_cur;
|
|
if (__n == __last_n)
|
|
return iterator(__n);
|
|
|
|
std::size_t __bkt = _M_bucket_index(__n);
|
|
|
|
__node_base* __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_type* __tmp = __n;
|
|
__n = __n->_M_next();
|
|
this->_M_deallocate_node(__tmp);
|
|
--_M_element_count;
|
|
if (!__n)
|
|
break;
|
|
__n_bkt = _M_bucket_index(__n);
|
|
}
|
|
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 || __is_bucket_begin))
|
|
_M_buckets[__n_bkt] = __prev_n;
|
|
__prev_n->_M_nxt = __n;
|
|
return iterator(__n);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
clear() noexcept
|
|
{
|
|
this->_M_deallocate_nodes(_M_begin());
|
|
__builtin_memset(_M_buckets, 0, _M_bucket_count * sizeof(__bucket_type));
|
|
_M_element_count = 0;
|
|
_M_before_begin._M_nxt = nullptr;
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
rehash(size_type __n)
|
|
{
|
|
const __rehash_state& __saved_state = _M_rehash_policy._M_state();
|
|
std::size_t __buckets
|
|
= std::max(_M_rehash_policy._M_bkt_for_elements(_M_element_count + 1),
|
|
__n);
|
|
__buckets = _M_rehash_policy._M_next_bkt(__buckets);
|
|
|
|
if (__buckets != _M_bucket_count)
|
|
_M_rehash(__buckets, __saved_state);
|
|
else
|
|
// No rehash, restore previous state to keep a consistent state.
|
|
_M_rehash_policy._M_reset(__saved_state);
|
|
}
|
|
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_rehash(size_type __n, const __rehash_state& __state)
|
|
{
|
|
__try
|
|
{
|
|
_M_rehash_aux(__n, __unique_keys());
|
|
}
|
|
__catch(...)
|
|
{
|
|
// 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;
|
|
}
|
|
}
|
|
|
|
// Rehash when there is no equivalent elements.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_rehash_aux(size_type __n, std::true_type)
|
|
{
|
|
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
|
|
__node_type* __p = _M_begin();
|
|
_M_before_begin._M_nxt = nullptr;
|
|
std::size_t __bbegin_bkt = 0;
|
|
while (__p)
|
|
{
|
|
__node_type* __next = __p->_M_next();
|
|
std::size_t __bkt = __hash_code_base::_M_bucket_index(__p, __n);
|
|
if (!__new_buckets[__bkt])
|
|
{
|
|
__p->_M_nxt = _M_before_begin._M_nxt;
|
|
_M_before_begin._M_nxt = __p;
|
|
__new_buckets[__bkt] = &_M_before_begin;
|
|
if (__p->_M_nxt)
|
|
__new_buckets[__bbegin_bkt] = __p;
|
|
__bbegin_bkt = __bkt;
|
|
}
|
|
else
|
|
{
|
|
__p->_M_nxt = __new_buckets[__bkt]->_M_nxt;
|
|
__new_buckets[__bkt]->_M_nxt = __p;
|
|
}
|
|
__p = __next;
|
|
}
|
|
|
|
_M_deallocate_buckets();
|
|
_M_bucket_count = __n;
|
|
_M_buckets = __new_buckets;
|
|
}
|
|
|
|
// Rehash when there can be equivalent elements, preserve their relative
|
|
// order.
|
|
template<typename _Key, typename _Value,
|
|
typename _Alloc, typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
|
|
typename _Traits>
|
|
void
|
|
_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
|
|
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
|
|
_M_rehash_aux(size_type __n, std::false_type)
|
|
{
|
|
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
|
|
|
|
__node_type* __p = _M_begin();
|
|
_M_before_begin._M_nxt = nullptr;
|
|
std::size_t __bbegin_bkt = 0;
|
|
std::size_t __prev_bkt = 0;
|
|
__node_type* __prev_p = nullptr;
|
|
bool __check_bucket = false;
|
|
|
|
while (__p)
|
|
{
|
|
__node_type* __next = __p->_M_next();
|
|
std::size_t __bkt = __hash_code_base::_M_bucket_index(__p, __n);
|
|
|
|
if (__prev_p && __prev_bkt == __bkt)
|
|
{
|
|
// Previous insert was already in this bucket, we insert after
|
|
// the previously inserted one to preserve equivalent elements
|
|
// relative order.
|
|
__p->_M_nxt = __prev_p->_M_nxt;
|
|
__prev_p->_M_nxt = __p;
|
|
|
|
// Inserting after a node in a bucket require to check that we
|
|
// haven't change the bucket last node, in this case next
|
|
// bucket containing its before begin node must be updated. We
|
|
// schedule a check as soon as we move out of the sequence of
|
|
// equivalent nodes to limit the number of checks.
|
|
__check_bucket = true;
|
|
}
|
|
else
|
|
{
|
|
if (__check_bucket)
|
|
{
|
|
// Check if we shall update the next bucket because of
|
|
// insertions into __prev_bkt bucket.
|
|
if (__prev_p->_M_nxt)
|
|
{
|
|
std::size_t __next_bkt
|
|
= __hash_code_base::_M_bucket_index(__prev_p->_M_next(),
|
|
__n);
|
|
if (__next_bkt != __prev_bkt)
|
|
__new_buckets[__next_bkt] = __prev_p;
|
|
}
|
|
__check_bucket = false;
|
|
}
|
|
|
|
if (!__new_buckets[__bkt])
|
|
{
|
|
__p->_M_nxt = _M_before_begin._M_nxt;
|
|
_M_before_begin._M_nxt = __p;
|
|
__new_buckets[__bkt] = &_M_before_begin;
|
|
if (__p->_M_nxt)
|
|
__new_buckets[__bbegin_bkt] = __p;
|
|
__bbegin_bkt = __bkt;
|
|
}
|
|
else
|
|
{
|
|
__p->_M_nxt = __new_buckets[__bkt]->_M_nxt;
|
|
__new_buckets[__bkt]->_M_nxt = __p;
|
|
}
|
|
}
|
|
__prev_p = __p;
|
|
__prev_bkt = __bkt;
|
|
__p = __next;
|
|
}
|
|
|
|
if (__check_bucket && __prev_p->_M_nxt)
|
|
{
|
|
std::size_t __next_bkt
|
|
= __hash_code_base::_M_bucket_index(__prev_p->_M_next(), __n);
|
|
if (__next_bkt != __prev_bkt)
|
|
__new_buckets[__next_bkt] = __prev_p;
|
|
}
|
|
|
|
_M_deallocate_buckets();
|
|
_M_bucket_count = __n;
|
|
_M_buckets = __new_buckets;
|
|
}
|
|
|
|
#if __cplusplus > 201402L
|
|
template<typename, typename, typename> class _Hash_merge_helper { };
|
|
#endif // C++17
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // _HASHTABLE_H
|