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Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/bits/hashtable.h')
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diff --git a/gcc-4.9/libstdc++-v3/include/bits/hashtable.h b/gcc-4.9/libstdc++-v3/include/bits/hashtable.h new file mode 100644 index 0000000..22e17d2 --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/bits/hashtable.h @@ -0,0 +1,2072 @@ +// hashtable.h header -*- C++ -*- + +// Copyright (C) 2007-2014 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file bits/hashtable.h + * This is an internal header file, included by other library headers. + * Do not attempt to use it directly. @headername{unordered_map, unordered_set} + */ + +#ifndef _HASHTABLE_H +#define _HASHTABLE_H 1 + +#pragma GCC system_header + +#include <bits/hashtable_policy.h> + +namespace std _GLIBCXX_VISIBILITY(default) +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + template<typename _Tp, typename _Hash> + using __cache_default + = __not_<__and_<// Do not cache for fast hasher. + __is_fast_hash<_Hash>, + // Mandatory to have erase not throwing. + __detail::__is_noexcept_hash<_Tp, _Hash>>>; + + /** + * Primary class template _Hashtable. + * + * @ingroup hashtable-detail + * + * @tparam _Value CopyConstructible type. + * + * @tparam _Key CopyConstructible type. + * + * @tparam _Alloc An allocator type + * ([lib.allocator.requirements]) whose _Alloc::value_type is + * _Value. As a conforming extension, we allow for + * _Alloc::value_type != _Value. + * + * @tparam _ExtractKey Function object that takes an object of type + * _Value and returns a value of type _Key. + * + * @tparam _Equal Function object that takes two objects of type k + * and returns a bool-like value that is true if the two objects + * are considered equal. + * + * @tparam _H1 The hash function. A unary function object with + * argument type _Key and result type size_t. Return values should + * be distributed over the entire range [0, numeric_limits<size_t>:::max()]. + * + * @tparam _H2 The range-hashing function (in the terminology of + * Tavori and Dreizin). A binary function object whose argument + * types and result type are all size_t. Given arguments r and N, + * the return value is in the range [0, N). + * + * @tparam _Hash The ranged hash function (Tavori and Dreizin). A + * binary function whose argument types are _Key and size_t and + * whose result type is size_t. Given arguments k and N, the + * return value is in the range [0, N). Default: hash(k, N) = + * h2(h1(k), N). If _Hash is anything other than the default, _H1 + * and _H2 are ignored. + * + * @tparam _RehashPolicy Policy class with three members, all of + * which govern the bucket count. _M_next_bkt(n) returns a bucket + * count no smaller than n. _M_bkt_for_elements(n) returns a + * bucket count appropriate for an element count of n. + * _M_need_rehash(n_bkt, n_elt, n_ins) determines whether, if the + * current bucket count is n_bkt and the current element count is + * n_elt, we need to increase the bucket count. If so, returns + * make_pair(true, n), where n is the new bucket count. If not, + * returns make_pair(false, <anything>) + * + * @tparam _Traits Compile-time class with three boolean + * std::integral_constant members: __cache_hash_code, __constant_iterators, + * __unique_keys. + * + * Each _Hashtable data structure has: + * + * - _Bucket[] _M_buckets + * - _Hash_node_base _M_before_begin + * - size_type _M_bucket_count + * - size_type _M_element_count + * + * with _Bucket being _Hash_node* and _Hash_node containing: + * + * - _Hash_node* _M_next + * - Tp _M_value + * - size_t _M_hash_code if cache_hash_code is true + * + * In terms of Standard containers the hashtable is like the aggregation of: + * + * - std::forward_list<_Node> containing the elements + * - std::vector<std::forward_list<_Node>::iterator> representing the buckets + * + * The non-empty buckets contain the node before the first node in the + * bucket. This design makes it possible to implement something like a + * std::forward_list::insert_after on container insertion and + * std::forward_list::erase_after on container erase + * calls. _M_before_begin is equivalent to + * std::forward_list::before_begin. Empty buckets contain + * nullptr. Note that one of the non-empty buckets contains + * &_M_before_begin which is not a dereferenceable node so the + * node pointer in a bucket shall never be dereferenced, only its + * next node can be. + * + * Walking through a bucket's nodes requires a check on the hash code to + * see if each node is still in the bucket. Such a design assumes a + * quite efficient hash functor and is one of the reasons it is + * highly advisable to set __cache_hash_code to true. + * + * The container iterators are simply built from nodes. This way + * incrementing the iterator is perfectly efficient independent of + * how many empty buckets there are in the container. + * + * On insert we compute the element's hash code and use it to find the + * bucket index. If the element must be inserted in an empty bucket + * we add it at the beginning of the singly linked list and make the + * bucket point to _M_before_begin. The bucket that used to point to + * _M_before_begin, if any, is updated to point to its new before + * begin node. + * + * On erase, the simple iterator design requires using the hash + * functor to get the index of the bucket to update. For this + * reason, when __cache_hash_code is set to false the hash functor must + * not throw and this is enforced by a static assertion. + * + * Functionality is implemented by decomposition into base classes, + * where the derived _Hashtable class is used in _Map_base, + * _Insert, _Rehash_base, and _Equality base classes to access the + * "this" pointer. _Hashtable_base is used in the base classes as a + * non-recursive, fully-completed-type so that detailed nested type + * information, such as iterator type and node type, can be + * used. This is similar to the "Curiously Recurring Template + * Pattern" (CRTP) technique, but uses a reconstructed, not + * explicitly passed, template pattern. + * + * Base class templates are: + * - __detail::_Hashtable_base + * - __detail::_Map_base + * - __detail::_Insert + * - __detail::_Rehash_base + * - __detail::_Equality + */ + template<typename _Key, typename _Value, typename _Alloc, + typename _ExtractKey, typename _Equal, + typename _H1, typename _H2, typename _Hash, + typename _RehashPolicy, typename _Traits> + class _Hashtable + : public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, + _H1, _H2, _Hash, _Traits>, + public __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>, + public __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>, + public __detail::_Rehash_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>, + public __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>, + private __detail::_Hashtable_alloc< + typename __alloctr_rebind<_Alloc, + __detail::_Hash_node<_Value, + _Traits::__hash_cached::value> >::__type> + { + using __traits_type = _Traits; + using __hash_cached = typename __traits_type::__hash_cached; + using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>; + using __node_alloc_type = + typename __alloctr_rebind<_Alloc, __node_type>::__type; + + using __hashtable_alloc = __detail::_Hashtable_alloc<__node_alloc_type>; + + using __value_alloc_traits = + typename __hashtable_alloc::__value_alloc_traits; + using __node_alloc_traits = + typename __hashtable_alloc::__node_alloc_traits; + using __node_base = typename __hashtable_alloc::__node_base; + using __bucket_type = typename __hashtable_alloc::__bucket_type; + + public: + typedef _Key key_type; + typedef _Value value_type; + typedef _Alloc allocator_type; + typedef _Equal key_equal; + + // mapped_type, if present, comes from _Map_base. + // hasher, if present, comes from _Hash_code_base/_Hashtable_base. + typedef typename __value_alloc_traits::pointer pointer; + typedef typename __value_alloc_traits::const_pointer const_pointer; + typedef value_type& reference; + typedef const value_type& const_reference; + + private: + using __rehash_type = _RehashPolicy; + using __rehash_state = typename __rehash_type::_State; + + using __constant_iterators = typename __traits_type::__constant_iterators; + using __unique_keys = typename __traits_type::__unique_keys; + + using __key_extract = typename std::conditional< + __constant_iterators::value, + __detail::_Identity, + __detail::_Select1st>::type; + + using __hashtable_base = __detail:: + _Hashtable_base<_Key, _Value, _ExtractKey, + _Equal, _H1, _H2, _Hash, _Traits>; + + using __hash_code_base = typename __hashtable_base::__hash_code_base; + using __hash_code = typename __hashtable_base::__hash_code; + using __ireturn_type = typename __hashtable_base::__ireturn_type; + + using __map_base = __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, + _Equal, _H1, _H2, _Hash, + _RehashPolicy, _Traits>; + + using __rehash_base = __detail::_Rehash_base<_Key, _Value, _Alloc, + _ExtractKey, _Equal, + _H1, _H2, _Hash, + _RehashPolicy, _Traits>; + + using __eq_base = __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, + _Equal, _H1, _H2, _Hash, + _RehashPolicy, _Traits>; + + using __reuse_or_alloc_node_type = + __detail::_ReuseOrAllocNode<__node_alloc_type>; + + // Metaprogramming for picking apart hash caching. + template<typename _Cond> + using __if_hash_cached = __or_<__not_<__hash_cached>, _Cond>; + + template<typename _Cond> + using __if_hash_not_cached = __or_<__hash_cached, _Cond>; + + // Compile-time diagnostics. + + // _Hash_code_base has everything protected, so use this derived type to + // access it. + struct __hash_code_base_access : __hash_code_base + { using __hash_code_base::_M_bucket_index; }; + + // Getting a bucket index from a node shall not throw because it is used + // in methods (erase, swap...) that shall not throw. + static_assert(noexcept(declval<const __hash_code_base_access&>() + ._M_bucket_index((const __node_type*)nullptr, + (std::size_t)0)), + "Cache the hash code or qualify your functors involved" + " in hash code and bucket index computation with noexcept"); + + // Following two static assertions are necessary to guarantee + // that local_iterator will be default constructible. + + // When hash codes are cached local iterator inherits from H2 functor + // which must then be default constructible. + static_assert(__if_hash_cached<is_default_constructible<_H2>>::value, + "Functor used to map hash code to bucket index" + " must be default constructible"); + + template<typename _Keya, typename _Valuea, typename _Alloca, + typename _ExtractKeya, typename _Equala, + typename _H1a, typename _H2a, typename _Hasha, + typename _RehashPolicya, typename _Traitsa, + bool _Unique_keysa> + friend struct __detail::_Map_base; + + template<typename _Keya, typename _Valuea, typename _Alloca, + typename _ExtractKeya, typename _Equala, + typename _H1a, typename _H2a, typename _Hasha, + typename _RehashPolicya, typename _Traitsa> + friend struct __detail::_Insert_base; + + template<typename _Keya, typename _Valuea, typename _Alloca, + typename _ExtractKeya, typename _Equala, + typename _H1a, typename _H2a, typename _Hasha, + typename _RehashPolicya, typename _Traitsa, + bool _Constant_iteratorsa, bool _Unique_keysa> + friend struct __detail::_Insert; + + public: + using size_type = typename __hashtable_base::size_type; + using difference_type = typename __hashtable_base::difference_type; + + using iterator = typename __hashtable_base::iterator; + using const_iterator = typename __hashtable_base::const_iterator; + + using local_iterator = typename __hashtable_base::local_iterator; + using const_local_iterator = typename __hashtable_base:: + const_local_iterator; + + private: + __bucket_type* _M_buckets; + size_type _M_bucket_count; + __node_base _M_before_begin; + size_type _M_element_count; + _RehashPolicy _M_rehash_policy; + + __hashtable_alloc& + _M_base_alloc() { return *this; } + + using __hashtable_alloc::_M_deallocate_buckets; + + void + _M_deallocate_buckets() + { this->_M_deallocate_buckets(_M_buckets, _M_bucket_count); } + + // Gets bucket begin, deals with the fact that non-empty buckets contain + // their before begin node. + __node_type* + _M_bucket_begin(size_type __bkt) const; + + __node_type* + _M_begin() const + { return static_cast<__node_type*>(_M_before_begin._M_nxt); } + + template<typename _NodeGenerator> + void + _M_assign(const _Hashtable&, const _NodeGenerator&); + + void + _M_move_assign(_Hashtable&&, std::true_type); + + void + _M_move_assign(_Hashtable&&, std::false_type); + + void + _M_reset() noexcept; + + public: + // Constructor, destructor, assignment, swap + _Hashtable(size_type __bucket_hint, + const _H1&, const _H2&, const _Hash&, + const _Equal&, const _ExtractKey&, + const allocator_type&); + + template<typename _InputIterator> + _Hashtable(_InputIterator __first, _InputIterator __last, + size_type __bucket_hint, + const _H1&, const _H2&, const _Hash&, + const _Equal&, const _ExtractKey&, + const allocator_type&); + + _Hashtable(const _Hashtable&); + + _Hashtable(_Hashtable&&) noexcept; + + _Hashtable(const _Hashtable&, const allocator_type&); + + _Hashtable(_Hashtable&&, const allocator_type&); + + // Use delegating constructors. + explicit + _Hashtable(const allocator_type& __a) + : _Hashtable(10, _H1(), _H2(), _Hash(), key_equal(), + __key_extract(), __a) + { } + + explicit + _Hashtable(size_type __n = 10, + const _H1& __hf = _H1(), + const key_equal& __eql = key_equal(), + const allocator_type& __a = allocator_type()) + : _Hashtable(__n, __hf, _H2(), _Hash(), __eql, + __key_extract(), __a) + { } + + 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()) + { + constexpr bool __move_storage = + __node_alloc_traits::_S_propagate_on_move_assign() + || __node_alloc_traits::_S_always_equal(); + _M_move_assign(std::move(__ht), + integral_constant<bool, __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); + return *this; + } + + ~_Hashtable() noexcept; + + void + swap(_Hashtable&) + noexcept(__node_alloc_traits::_S_nothrow_swap()); + + // 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&); + + // 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); + + // 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&, std::true_type); + + template<typename _Arg, typename _NodeGenerator> + iterator + _M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen, + std::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, + std::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&, std::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) + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return 0; + 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. + + 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, + _Equal, _H1, _H2, _Hash, _RehashPolicy, + _Traits>::__node_type* + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_bucket_begin(size_type __bkt) const + { + __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_base(__exk, __h1, __h2, __h, __eq), + __map_base(), + __rehash_base(), + __hashtable_alloc(__node_alloc_type(__a)), + _M_element_count(0), + _M_rehash_policy() + { + _M_bucket_count = _M_rehash_policy._M_next_bkt(__bucket_hint); + _M_buckets = this->_M_allocate_buckets(_M_bucket_count); + } + + 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_base(__exk, __h1, __h2, __h, __eq), + __map_base(), + __rehash_base(), + __hashtable_alloc(__node_alloc_type(__a)), + _M_element_count(0), + _M_rehash_policy() + { + auto __nb_elems = __detail::__distance_fw(__f, __l); + _M_bucket_count = + _M_rehash_policy._M_next_bkt( + std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems), + __bucket_hint)); + + _M_buckets = this->_M_allocate_buckets(_M_bucket_count); + __try + { + for (; __f != __l; ++__f) + this->insert(*__f); + } + __catch(...) + { + clear(); + _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> + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>& + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>::operator=( + const _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>& __ht) + { + 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()); + if (__builtin_expect(_M_bucket_count != 0, true)) + _M_deallocate_buckets(); + _M_reset(); + 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. + __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 = this->_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=(__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, + [&__roan](const __node_type* __n) + { return __roan(__n->_M_v()); }); + if (__former_buckets) + this->_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; + } + 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 _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 = this->_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 = 0; + _M_buckets = nullptr; + _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()); + if (__builtin_expect(_M_bucket_count != 0, true)) + _M_deallocate_buckets(); + + __hashtable_base::operator=(std::move(__ht)); + _M_rehash_policy = __ht._M_rehash_policy; + _M_buckets = __ht._M_buckets; + _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. + __bucket_type* __former_buckets = nullptr; + size_type __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 = this->_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::move(__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, + [&__roan](__node_type* __n) + { return __roan(std::move_if_noexcept(__n->_M_v())); }); + __ht.clear(); + } + __catch(...) + { + if (__former_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> + _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(), + _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, 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(), + _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()) + { + _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(); + if (_M_buckets) + _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(__node_alloc_traits::_S_nothrow_swap()) + { + // 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); + 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); + + // 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> + void + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + __rehash_policy(const _RehashPolicy& __pol) + { + size_type __n_bkt = __pol._M_bkt_for_elements(_M_element_count); + __n_bkt = __pol._M_next_bkt(__n_bkt); + if (__n_bkt != _M_bucket_count) + _M_rehash(__n_bkt, _M_rehash_policy._M_state()); + _M_rehash_policy = __pol; + } + + template<typename _Key, typename _Value, + typename _Alloc, typename _ExtractKey, typename _Equal, + typename _H1, typename _H2, typename _Hash, typename _RehashPolicy, + typename _Traits> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + find(const key_type& __k) + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return end(); + + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::const_iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + find(const key_type& __k) const + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return end(); + + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::size_type + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + count(const key_type& __k) const + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return 0; + + __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 more equivalent values. + 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> + std::pair<typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::iterator, + typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::iterator> + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + equal_range(const key_type& __k) + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return std::make_pair(end(), end()); + + __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> + std::pair<typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::const_iterator, + typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::const_iterator> + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + equal_range(const key_type& __k) const + { + if (__builtin_expect(_M_bucket_count == 0, false)) + return std::make_pair(end(), end()); + + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, + _Equal, _H1, _H2, _Hash, _RehashPolicy, + _Traits>::__node_base* + _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* __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, + _Equal, _H1, _H2, _Hash, _RehashPolicy, + _Traits>::__node_base* + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_get_previous_node(size_type __bkt, __node_base* __n) + { + __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> + std::pair<typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::iterator, bool> + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_emplace(std::true_type, _Args&&... __args) + { + // 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_emplace(const_iterator __hint, std::false_type, _Args&&... __args) + { + // 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_insert_unique_node(size_type __bkt, __hash_code __code, + __node_type* __node) + { + 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); + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_insert_multi_node(__node_type* __hint, __hash_code __code, + __node_type* __node) + { + 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> + std::pair<typename _Hashtable<_Key, _Value, _Alloc, + _ExtractKey, _Equal, _H1, + _H2, _Hash, _RehashPolicy, + _Traits>::iterator, bool> + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_insert(_Arg&& __v, const _NodeGenerator& __node_gen, std::true_type) + { + 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 std::make_pair(_M_insert_unique_node(__bkt, __code, __n), 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_insert(const_iterator __hint, _Arg&& __v, + const _NodeGenerator& __node_gen, + std::false_type) + { + // 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + erase(const_iterator __it) + { + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_erase(size_type __bkt, __node_base* __prev_n, __node_type* __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; + 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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::size_type + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_erase(std::true_type, const key_type& __k) + { + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::size_type + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + _M_erase(std::false_type, const key_type& __k) + { + __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> + typename _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, + _Traits>::iterator + _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, + _H1, _H2, _Hash, _RehashPolicy, _Traits>:: + erase(const_iterator __first, const_iterator __last) + { + __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 = this->_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; + } + + if (__builtin_expect(_M_bucket_count != 0, true)) + _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 = this->_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; + } + + if (__builtin_expect(_M_bucket_count != 0, true)) + _M_deallocate_buckets(); + _M_bucket_count = __n; + _M_buckets = __new_buckets; + } + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace std + +#endif // _HASHTABLE_H |