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e133ace8 PC |
1 | // hashtable.h header -*- C++ -*- |
2 | ||
99dee823 | 3 | // Copyright (C) 2007-2021 Free Software Foundation, Inc. |
e133ace8 PC |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
e133ace8 PC |
9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
e133ace8 | 24 | |
94dabea7 | 25 | /** @file bits/hashtable.h |
e133ace8 | 26 | * This is an internal header file, included by other library headers. |
30f276c1 | 27 | * Do not attempt to use it directly. @headername{unordered_map, unordered_set} |
e133ace8 PC |
28 | */ |
29 | ||
30 | #ifndef _HASHTABLE_H | |
31 | #define _HASHTABLE_H 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
3b2524b1 | 35 | #include <bits/hashtable_policy.h> |
2dbe56bd JW |
36 | #if __cplusplus > 201402L |
37 | # include <bits/node_handle.h> | |
38 | #endif | |
e133ace8 | 39 | |
12ffa228 BK |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { | |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
7c3e9502 | 43 | |
4dad8b49 | 44 | template<typename _Tp, typename _Hash> |
5b3be7cf | 45 | using __cache_default |
4df047dd FD |
46 | = __not_<__and_<// Do not cache for fast hasher. |
47 | __is_fast_hash<_Hash>, | |
5b3be7cf | 48 | // Mandatory to have erase not throwing. |
866e4d38 | 49 | __is_nothrow_invocable<const _Hash&, const _Tp&>>>; |
7c3e9502 | 50 | |
da29608a | 51 | /** |
4dad8b49 BK |
52 | * Primary class template _Hashtable. |
53 | * | |
54 | * @ingroup hashtable-detail | |
55 | * | |
56 | * @tparam _Value CopyConstructible type. | |
57 | * | |
58 | * @tparam _Key CopyConstructible type. | |
59 | * | |
60 | * @tparam _Alloc An allocator type | |
61 | * ([lib.allocator.requirements]) whose _Alloc::value_type is | |
62 | * _Value. As a conforming extension, we allow for | |
63 | * _Alloc::value_type != _Value. | |
64 | * | |
65 | * @tparam _ExtractKey Function object that takes an object of type | |
66 | * _Value and returns a value of type _Key. | |
67 | * | |
68 | * @tparam _Equal Function object that takes two objects of type k | |
69 | * and returns a bool-like value that is true if the two objects | |
70 | * are considered equal. | |
71 | * | |
4797a61c | 72 | * @tparam _Hash The hash function. A unary function object with |
4dad8b49 BK |
73 | * argument type _Key and result type size_t. Return values should |
74 | * be distributed over the entire range [0, numeric_limits<size_t>:::max()]. | |
75 | * | |
4797a61c | 76 | * @tparam _RangeHash The range-hashing function (in the terminology of |
4dad8b49 BK |
77 | * Tavori and Dreizin). A binary function object whose argument |
78 | * types and result type are all size_t. Given arguments r and N, | |
79 | * the return value is in the range [0, N). | |
80 | * | |
4797a61c | 81 | * @tparam _Unused Not used. |
4dad8b49 BK |
82 | * |
83 | * @tparam _RehashPolicy Policy class with three members, all of | |
84 | * which govern the bucket count. _M_next_bkt(n) returns a bucket | |
85 | * count no smaller than n. _M_bkt_for_elements(n) returns a | |
86 | * bucket count appropriate for an element count of n. | |
87 | * _M_need_rehash(n_bkt, n_elt, n_ins) determines whether, if the | |
88 | * current bucket count is n_bkt and the current element count is | |
4797a61c FD |
89 | * n_elt, we need to increase the bucket count for n_ins insertions. |
90 | * If so, returns make_pair(true, n), where n is the new bucket count. If | |
91 | * not, returns make_pair(false, <anything>) | |
4dad8b49 BK |
92 | * |
93 | * @tparam _Traits Compile-time class with three boolean | |
94 | * std::integral_constant members: __cache_hash_code, __constant_iterators, | |
95 | * __unique_keys. | |
da29608a | 96 | * |
4dad8b49 | 97 | * Each _Hashtable data structure has: |
da29608a | 98 | * |
4dad8b49 | 99 | * - _Bucket[] _M_buckets |
b09bcf83 | 100 | * - _Hash_node_base _M_before_begin |
4dad8b49 BK |
101 | * - size_type _M_bucket_count |
102 | * - size_type _M_element_count | |
da29608a | 103 | * |
1b6f0476 | 104 | * with _Bucket being _Hash_node_base* and _Hash_node containing: |
da29608a | 105 | * |
4dad8b49 BK |
106 | * - _Hash_node* _M_next |
107 | * - Tp _M_value | |
207585a6 | 108 | * - size_t _M_hash_code if cache_hash_code is true |
da29608a | 109 | * |
207585a6 | 110 | * In terms of Standard containers the hashtable is like the aggregation of: |
da29608a | 111 | * |
4dad8b49 BK |
112 | * - std::forward_list<_Node> containing the elements |
113 | * - std::vector<std::forward_list<_Node>::iterator> representing the buckets | |
114 | * | |
207585a6 JW |
115 | * The non-empty buckets contain the node before the first node in the |
116 | * bucket. This design makes it possible to implement something like a | |
4dad8b49 BK |
117 | * std::forward_list::insert_after on container insertion and |
118 | * std::forward_list::erase_after on container erase | |
119 | * calls. _M_before_begin is equivalent to | |
207585a6 JW |
120 | * std::forward_list::before_begin. Empty buckets contain |
121 | * nullptr. Note that one of the non-empty buckets contains | |
122 | * &_M_before_begin which is not a dereferenceable node so the | |
123 | * node pointer in a bucket shall never be dereferenced, only its | |
4dad8b49 BK |
124 | * next node can be. |
125 | * | |
207585a6 JW |
126 | * Walking through a bucket's nodes requires a check on the hash code to |
127 | * see if each node is still in the bucket. Such a design assumes a | |
4dad8b49 | 128 | * quite efficient hash functor and is one of the reasons it is |
207585a6 | 129 | * highly advisable to set __cache_hash_code to true. |
4dad8b49 BK |
130 | * |
131 | * The container iterators are simply built from nodes. This way | |
132 | * incrementing the iterator is perfectly efficient independent of | |
133 | * how many empty buckets there are in the container. | |
134 | * | |
207585a6 JW |
135 | * On insert we compute the element's hash code and use it to find the |
136 | * bucket index. If the element must be inserted in an empty bucket | |
4dad8b49 BK |
137 | * we add it at the beginning of the singly linked list and make the |
138 | * bucket point to _M_before_begin. The bucket that used to point to | |
139 | * _M_before_begin, if any, is updated to point to its new before | |
140 | * begin node. | |
141 | * | |
207585a6 | 142 | * On erase, the simple iterator design requires using the hash |
4dad8b49 | 143 | * functor to get the index of the bucket to update. For this |
207585a6 JW |
144 | * reason, when __cache_hash_code is set to false the hash functor must |
145 | * not throw and this is enforced by a static assertion. | |
4dad8b49 BK |
146 | * |
147 | * Functionality is implemented by decomposition into base classes, | |
148 | * where the derived _Hashtable class is used in _Map_base, | |
149 | * _Insert, _Rehash_base, and _Equality base classes to access the | |
150 | * "this" pointer. _Hashtable_base is used in the base classes as a | |
151 | * non-recursive, fully-completed-type so that detailed nested type | |
152 | * information, such as iterator type and node type, can be | |
153 | * used. This is similar to the "Curiously Recurring Template | |
154 | * Pattern" (CRTP) technique, but uses a reconstructed, not | |
155 | * explicitly passed, template pattern. | |
156 | * | |
157 | * Base class templates are: | |
af6204cc BK |
158 | * - __detail::_Hashtable_base |
159 | * - __detail::_Map_base | |
160 | * - __detail::_Insert | |
161 | * - __detail::_Rehash_base | |
162 | * - __detail::_Equality | |
da29608a | 163 | */ |
4dad8b49 | 164 | template<typename _Key, typename _Value, typename _Alloc, |
3b2524b1 | 165 | typename _ExtractKey, typename _Equal, |
4797a61c | 166 | typename _Hash, typename _RangeHash, typename _Unused, |
4dad8b49 | 167 | typename _RehashPolicy, typename _Traits> |
3b2524b1 | 168 | class _Hashtable |
4dad8b49 | 169 | : public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, |
4797a61c | 170 | _Hash, _RangeHash, _Unused, _Traits>, |
4dad8b49 | 171 | public __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
172 | _Hash, _RangeHash, _Unused, |
173 | _RehashPolicy, _Traits>, | |
4dad8b49 | 174 | public __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
175 | _Hash, _RangeHash, _Unused, |
176 | _RehashPolicy, _Traits>, | |
4dad8b49 | 177 | public __detail::_Rehash_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
178 | _Hash, _RangeHash, _Unused, |
179 | _RehashPolicy, _Traits>, | |
4dad8b49 | 180 | public __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
181 | _Hash, _RangeHash, _Unused, |
182 | _RehashPolicy, _Traits>, | |
b09bcf83 | 183 | private __detail::_Hashtable_alloc< |
79466838 JW |
184 | __alloc_rebind<_Alloc, |
185 | __detail::_Hash_node<_Value, | |
186 | _Traits::__hash_cached::value>>> | |
3b2524b1 | 187 | { |
866e4d38 JW |
188 | static_assert(is_same<typename remove_cv<_Value>::type, _Value>::value, |
189 | "unordered container must have a non-const, non-volatile value_type"); | |
ebaf3659 | 190 | #if __cplusplus > 201703L || defined __STRICT_ANSI__ |
866e4d38 JW |
191 | static_assert(is_same<typename _Alloc::value_type, _Value>{}, |
192 | "unordered container must have the same value_type as its allocator"); | |
193 | #endif | |
866e4d38 | 194 | |
b09bcf83 FD |
195 | using __traits_type = _Traits; |
196 | using __hash_cached = typename __traits_type::__hash_cached; | |
1b6f0476 | 197 | using __constant_iterators = typename __traits_type::__constant_iterators; |
b09bcf83 | 198 | using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>; |
79466838 | 199 | using __node_alloc_type = __alloc_rebind<_Alloc, __node_type>; |
b09bcf83 FD |
200 | |
201 | using __hashtable_alloc = __detail::_Hashtable_alloc<__node_alloc_type>; | |
202 | ||
1b6f0476 FD |
203 | using __node_value_type = |
204 | __detail::_Hash_node_value<_Value, __hash_cached::value>; | |
205 | using __node_ptr = typename __hashtable_alloc::__node_ptr; | |
b09bcf83 FD |
206 | using __value_alloc_traits = |
207 | typename __hashtable_alloc::__value_alloc_traits; | |
208 | using __node_alloc_traits = | |
209 | typename __hashtable_alloc::__node_alloc_traits; | |
210 | using __node_base = typename __hashtable_alloc::__node_base; | |
1b6f0476 FD |
211 | using __node_base_ptr = typename __hashtable_alloc::__node_base_ptr; |
212 | using __buckets_ptr = typename __hashtable_alloc::__buckets_ptr; | |
213 | ||
214 | using __insert_base = __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, | |
215 | _Equal, _Hash, | |
216 | _RangeHash, _Unused, | |
217 | _RehashPolicy, _Traits>; | |
0462b6aa | 218 | |
4dad8b49 | 219 | public: |
0462b6aa FD |
220 | typedef _Key key_type; |
221 | typedef _Value value_type; | |
222 | typedef _Alloc allocator_type; | |
223 | typedef _Equal key_equal; | |
4dad8b49 BK |
224 | |
225 | // mapped_type, if present, comes from _Map_base. | |
226 | // hasher, if present, comes from _Hash_code_base/_Hashtable_base. | |
b09bcf83 FD |
227 | typedef typename __value_alloc_traits::pointer pointer; |
228 | typedef typename __value_alloc_traits::const_pointer const_pointer; | |
0462b6aa FD |
229 | typedef value_type& reference; |
230 | typedef const value_type& const_reference; | |
4dad8b49 | 231 | |
1b6f0476 FD |
232 | using iterator = typename __insert_base::iterator; |
233 | ||
234 | using const_iterator = typename __insert_base::const_iterator; | |
235 | ||
236 | using local_iterator = __detail::_Local_iterator<key_type, _Value, | |
237 | _ExtractKey, _Hash, _RangeHash, _Unused, | |
238 | __constant_iterators::value, | |
239 | __hash_cached::value>; | |
240 | ||
241 | using const_local_iterator = __detail::_Local_const_iterator< | |
242 | key_type, _Value, | |
243 | _ExtractKey, _Hash, _RangeHash, _Unused, | |
244 | __constant_iterators::value, __hash_cached::value>; | |
245 | ||
4dad8b49 BK |
246 | private: |
247 | using __rehash_type = _RehashPolicy; | |
248 | using __rehash_state = typename __rehash_type::_State; | |
249 | ||
4dad8b49 BK |
250 | using __unique_keys = typename __traits_type::__unique_keys; |
251 | ||
4dad8b49 | 252 | using __hashtable_base = __detail:: |
4797a61c FD |
253 | _Hashtable_base<_Key, _Value, _ExtractKey, |
254 | _Equal, _Hash, _RangeHash, _Unused, _Traits>; | |
4dad8b49 BK |
255 | |
256 | using __hash_code_base = typename __hashtable_base::__hash_code_base; | |
257 | using __hash_code = typename __hashtable_base::__hash_code; | |
1b6f0476 | 258 | using __ireturn_type = typename __insert_base::__ireturn_type; |
4dad8b49 BK |
259 | |
260 | using __map_base = __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, | |
4797a61c | 261 | _Equal, _Hash, _RangeHash, _Unused, |
4dad8b49 BK |
262 | _RehashPolicy, _Traits>; |
263 | ||
264 | using __rehash_base = __detail::_Rehash_base<_Key, _Value, _Alloc, | |
265 | _ExtractKey, _Equal, | |
4797a61c | 266 | _Hash, _RangeHash, _Unused, |
4dad8b49 BK |
267 | _RehashPolicy, _Traits>; |
268 | ||
269 | using __eq_base = __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, | |
4797a61c | 270 | _Equal, _Hash, _RangeHash, _Unused, |
4dad8b49 BK |
271 | _RehashPolicy, _Traits>; |
272 | ||
7cfe71d1 | 273 | using __reuse_or_alloc_node_gen_t = |
b09bcf83 | 274 | __detail::_ReuseOrAllocNode<__node_alloc_type>; |
b9c84e95 FD |
275 | using __alloc_node_gen_t = |
276 | __detail::_AllocNode<__node_alloc_type>; | |
b3abc9d8 | 277 | |
b0c849fa FD |
278 | // Simple RAII type for managing a node containing an element |
279 | struct _Scoped_node | |
280 | { | |
281 | // Take ownership of a node with a constructed element. | |
1b6f0476 | 282 | _Scoped_node(__node_ptr __n, __hashtable_alloc* __h) |
b0c849fa FD |
283 | : _M_h(__h), _M_node(__n) { } |
284 | ||
285 | // Allocate a node and construct an element within it. | |
286 | template<typename... _Args> | |
287 | _Scoped_node(__hashtable_alloc* __h, _Args&&... __args) | |
288 | : _M_h(__h), | |
289 | _M_node(__h->_M_allocate_node(std::forward<_Args>(__args)...)) | |
290 | { } | |
291 | ||
292 | // Destroy element and deallocate node. | |
293 | ~_Scoped_node() { if (_M_node) _M_h->_M_deallocate_node(_M_node); }; | |
294 | ||
295 | _Scoped_node(const _Scoped_node&) = delete; | |
296 | _Scoped_node& operator=(const _Scoped_node&) = delete; | |
297 | ||
298 | __hashtable_alloc* _M_h; | |
1b6f0476 | 299 | __node_ptr _M_node; |
b0c849fa FD |
300 | }; |
301 | ||
b9c84e95 FD |
302 | template<typename _Ht> |
303 | static constexpr | |
304 | typename conditional<std::is_lvalue_reference<_Ht>::value, | |
305 | const value_type&, value_type&&>::type | |
306 | __fwd_value_for(value_type& __val) noexcept | |
307 | { return std::move(__val); } | |
308 | ||
4dad8b49 BK |
309 | // Compile-time diagnostics. |
310 | ||
1bb59e05 FD |
311 | // _Hash_code_base has everything protected, so use this derived type to |
312 | // access it. | |
313 | struct __hash_code_base_access : __hash_code_base | |
314 | { using __hash_code_base::_M_bucket_index; }; | |
315 | ||
0462b6aa FD |
316 | // Getting a bucket index from a node shall not throw because it is used |
317 | // in methods (erase, swap...) that shall not throw. | |
1bb59e05 | 318 | static_assert(noexcept(declval<const __hash_code_base_access&>() |
1b6f0476 FD |
319 | ._M_bucket_index(declval<const __node_value_type&>(), |
320 | (std::size_t)0)), | |
0462b6aa FD |
321 | "Cache the hash code or qualify your functors involved" |
322 | " in hash code and bucket index computation with noexcept"); | |
4dad8b49 | 323 | |
4797a61c FD |
324 | // To get bucket index we need _RangeHash not to throw. |
325 | static_assert(is_nothrow_default_constructible<_RangeHash>::value, | |
4dad8b49 | 326 | "Functor used to map hash code to bucket index" |
4797a61c FD |
327 | " must be nothrow default constructible"); |
328 | static_assert(noexcept( | |
329 | std::declval<const _RangeHash&>()((std::size_t)0, (std::size_t)0)), | |
330 | "Functor used to map hash code to bucket index must be" | |
331 | " noexcept"); | |
332 | ||
333 | // To compute bucket index we also need _ExtratKey not to throw. | |
334 | static_assert(is_nothrow_default_constructible<_ExtractKey>::value, | |
335 | "_ExtractKey must be nothrow default constructible"); | |
336 | static_assert(noexcept( | |
337 | std::declval<const _ExtractKey&>()(std::declval<_Value>())), | |
338 | "_ExtractKey functor must be noexcept invocable"); | |
4dad8b49 | 339 | |
4dad8b49 BK |
340 | template<typename _Keya, typename _Valuea, typename _Alloca, |
341 | typename _ExtractKeya, typename _Equala, | |
4797a61c | 342 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
4dad8b49 BK |
343 | typename _RehashPolicya, typename _Traitsa, |
344 | bool _Unique_keysa> | |
7c3e9502 | 345 | friend struct __detail::_Map_base; |
3b2524b1 | 346 | |
4dad8b49 BK |
347 | template<typename _Keya, typename _Valuea, typename _Alloca, |
348 | typename _ExtractKeya, typename _Equala, | |
4797a61c | 349 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
4dad8b49 BK |
350 | typename _RehashPolicya, typename _Traitsa> |
351 | friend struct __detail::_Insert_base; | |
352 | ||
353 | template<typename _Keya, typename _Valuea, typename _Alloca, | |
354 | typename _ExtractKeya, typename _Equala, | |
4797a61c | 355 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
4dad8b49 | 356 | typename _RehashPolicya, typename _Traitsa, |
dc448fa0 | 357 | bool _Constant_iteratorsa> |
4dad8b49 BK |
358 | friend struct __detail::_Insert; |
359 | ||
d9165389 FD |
360 | template<typename _Keya, typename _Valuea, typename _Alloca, |
361 | typename _ExtractKeya, typename _Equala, | |
4797a61c | 362 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
d9165389 FD |
363 | typename _RehashPolicya, typename _Traitsa, |
364 | bool _Unique_keysa> | |
365 | friend struct __detail::_Equality; | |
366 | ||
b3abc9d8 | 367 | public: |
4dad8b49 BK |
368 | using size_type = typename __hashtable_base::size_type; |
369 | using difference_type = typename __hashtable_base::difference_type; | |
370 | ||
2dbe56bd JW |
371 | #if __cplusplus > 201402L |
372 | using node_type = _Node_handle<_Key, _Value, __node_alloc_type>; | |
373 | using insert_return_type = _Node_insert_return<iterator, node_type>; | |
374 | #endif | |
375 | ||
3b2524b1 | 376 | private: |
1b6f0476 | 377 | __buckets_ptr _M_buckets = &_M_single_bucket; |
da27f556 | 378 | size_type _M_bucket_count = 1; |
b09bcf83 | 379 | __node_base _M_before_begin; |
da27f556 | 380 | size_type _M_element_count = 0; |
f86b266c | 381 | _RehashPolicy _M_rehash_policy; |
fb7342fd | 382 | |
95539f21 | 383 | // A single bucket used when only need for 1 bucket. Especially |
7cfe71d1 | 384 | // interesting in move semantic to leave hashtable with only 1 bucket |
95539f21 FD |
385 | // which is not allocated so that we can have those operations noexcept |
386 | // qualified. | |
387 | // Note that we can't leave hashtable with 0 bucket without adding | |
388 | // numerous checks in the code to avoid 0 modulus. | |
1b6f0476 | 389 | __node_base_ptr _M_single_bucket = nullptr; |
95539f21 | 390 | |
f9d98fa7 FD |
391 | void |
392 | _M_update_bbegin() | |
393 | { | |
394 | if (_M_begin()) | |
1b6f0476 | 395 | _M_buckets[_M_bucket_index(*_M_begin())] = &_M_before_begin; |
f9d98fa7 FD |
396 | } |
397 | ||
398 | void | |
1b6f0476 | 399 | _M_update_bbegin(__node_ptr __n) |
f9d98fa7 FD |
400 | { |
401 | _M_before_begin._M_nxt = __n; | |
402 | _M_update_bbegin(); | |
403 | } | |
404 | ||
95539f21 | 405 | bool |
1b6f0476 | 406 | _M_uses_single_bucket(__buckets_ptr __bkts) const |
e6fb44d8 | 407 | { return __builtin_expect(__bkts == &_M_single_bucket, false); } |
95539f21 FD |
408 | |
409 | bool | |
410 | _M_uses_single_bucket() const | |
411 | { return _M_uses_single_bucket(_M_buckets); } | |
412 | ||
b09bcf83 FD |
413 | __hashtable_alloc& |
414 | _M_base_alloc() { return *this; } | |
0dd49691 | 415 | |
1b6f0476 | 416 | __buckets_ptr |
7cfe71d1 | 417 | _M_allocate_buckets(size_type __bkt_count) |
95539f21 | 418 | { |
7cfe71d1 | 419 | if (__builtin_expect(__bkt_count == 1, false)) |
95539f21 FD |
420 | { |
421 | _M_single_bucket = nullptr; | |
422 | return &_M_single_bucket; | |
423 | } | |
424 | ||
7cfe71d1 | 425 | return __hashtable_alloc::_M_allocate_buckets(__bkt_count); |
95539f21 FD |
426 | } |
427 | ||
428 | void | |
1b6f0476 | 429 | _M_deallocate_buckets(__buckets_ptr __bkts, size_type __bkt_count) |
95539f21 FD |
430 | { |
431 | if (_M_uses_single_bucket(__bkts)) | |
432 | return; | |
433 | ||
7cfe71d1 | 434 | __hashtable_alloc::_M_deallocate_buckets(__bkts, __bkt_count); |
95539f21 | 435 | } |
da29608a | 436 | |
0462b6aa FD |
437 | void |
438 | _M_deallocate_buckets() | |
95539f21 | 439 | { _M_deallocate_buckets(_M_buckets, _M_bucket_count); } |
0462b6aa | 440 | |
f86b266c FD |
441 | // Gets bucket begin, deals with the fact that non-empty buckets contain |
442 | // their before begin node. | |
1b6f0476 | 443 | __node_ptr |
da29608a FD |
444 | _M_bucket_begin(size_type __bkt) const; |
445 | ||
1b6f0476 | 446 | __node_ptr |
f86b266c | 447 | _M_begin() const |
1b6f0476 | 448 | { return static_cast<__node_ptr>(_M_before_begin._M_nxt); } |
da29608a | 449 | |
b9c84e95 FD |
450 | // Assign *this using another _Hashtable instance. Whether elements |
451 | // are copied or moved depends on the _Ht reference. | |
452 | template<typename _Ht> | |
01021139 | 453 | void |
b9c84e95 | 454 | _M_assign_elements(_Ht&&); |
01021139 | 455 | |
b9c84e95 | 456 | template<typename _Ht, typename _NodeGenerator> |
0462b6aa | 457 | void |
b9c84e95 | 458 | _M_assign(_Ht&&, const _NodeGenerator&); |
0462b6aa FD |
459 | |
460 | void | |
7cfe71d1 | 461 | _M_move_assign(_Hashtable&&, true_type); |
0462b6aa FD |
462 | |
463 | void | |
7cfe71d1 | 464 | _M_move_assign(_Hashtable&&, false_type); |
0462b6aa FD |
465 | |
466 | void | |
467 | _M_reset() noexcept; | |
468 | ||
4797a61c | 469 | _Hashtable(const _Hash& __h, const _Equal& __eq, |
da27f556 | 470 | const allocator_type& __a) |
4797a61c | 471 | : __hashtable_base(__h, __eq), |
7cfe71d1 | 472 | __hashtable_alloc(__node_alloc_type(__a)) |
da27f556 FD |
473 | { } |
474 | ||
12324b9a FD |
475 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
476 | true_type /* alloc always equal */) | |
4797a61c | 477 | noexcept(std::is_nothrow_copy_constructible<_Hash>::value && |
12324b9a FD |
478 | std::is_nothrow_copy_constructible<_Equal>::value); |
479 | ||
480 | _Hashtable(_Hashtable&&, __node_alloc_type&&, | |
481 | false_type /* alloc always equal */); | |
482 | ||
6dcf0423 FD |
483 | template<typename _InputIterator> |
484 | _Hashtable(_InputIterator __first, _InputIterator __last, | |
485 | size_type __bkt_count_hint, | |
4797a61c | 486 | const _Hash&, const _Equal&, const allocator_type&, |
6dcf0423 FD |
487 | true_type __uks); |
488 | ||
489 | template<typename _InputIterator> | |
490 | _Hashtable(_InputIterator __first, _InputIterator __last, | |
491 | size_type __bkt_count_hint, | |
4797a61c | 492 | const _Hash&, const _Equal&, const allocator_type&, |
6dcf0423 FD |
493 | false_type __uks); |
494 | ||
7c3e9502 | 495 | public: |
3b2524b1 | 496 | // Constructor, destructor, assignment, swap |
da27f556 | 497 | _Hashtable() = default; |
7c3e9502 | 498 | |
3b2524b1 PC |
499 | _Hashtable(const _Hashtable&); |
500 | ||
4797a61c FD |
501 | _Hashtable(const _Hashtable&, const allocator_type&); |
502 | ||
503 | explicit | |
504 | _Hashtable(size_type __bkt_count_hint, | |
505 | const _Hash& __hf = _Hash(), | |
506 | const key_equal& __eql = key_equal(), | |
507 | const allocator_type& __a = allocator_type()); | |
508 | ||
509 | // Use delegating constructors. | |
12324b9a FD |
510 | _Hashtable(_Hashtable&& __ht) |
511 | noexcept( noexcept( | |
512 | _Hashtable(std::declval<_Hashtable>(), | |
513 | std::declval<__node_alloc_type>(), | |
514 | true_type{})) ) | |
515 | : _Hashtable(std::move(__ht), std::move(__ht._M_node_allocator()), | |
516 | true_type{}) | |
517 | { } | |
0462b6aa | 518 | |
12324b9a FD |
519 | _Hashtable(_Hashtable&& __ht, const allocator_type& __a) |
520 | noexcept( noexcept( | |
521 | _Hashtable(std::declval<_Hashtable>(), | |
522 | std::declval<__node_alloc_type>(), | |
523 | typename __node_alloc_traits::is_always_equal{})) ) | |
524 | : _Hashtable(std::move(__ht), __node_alloc_type(__a), | |
525 | typename __node_alloc_traits::is_always_equal{}) | |
526 | { } | |
b24a9835 | 527 | |
0462b6aa FD |
528 | explicit |
529 | _Hashtable(const allocator_type& __a) | |
7cfe71d1 | 530 | : __hashtable_alloc(__node_alloc_type(__a)) |
0462b6aa FD |
531 | { } |
532 | ||
4dad8b49 BK |
533 | template<typename _InputIterator> |
534 | _Hashtable(_InputIterator __f, _InputIterator __l, | |
7cfe71d1 | 535 | size_type __bkt_count_hint = 0, |
4797a61c | 536 | const _Hash& __hf = _Hash(), |
4dad8b49 BK |
537 | const key_equal& __eql = key_equal(), |
538 | const allocator_type& __a = allocator_type()) | |
4797a61c FD |
539 | : _Hashtable(__f, __l, __bkt_count_hint, __hf, __eql, __a, |
540 | __unique_keys{}) | |
4dad8b49 BK |
541 | { } |
542 | ||
543 | _Hashtable(initializer_list<value_type> __l, | |
7cfe71d1 | 544 | size_type __bkt_count_hint = 0, |
4797a61c | 545 | const _Hash& __hf = _Hash(), |
4dad8b49 BK |
546 | const key_equal& __eql = key_equal(), |
547 | const allocator_type& __a = allocator_type()) | |
7cfe71d1 | 548 | : _Hashtable(__l.begin(), __l.end(), __bkt_count_hint, |
4797a61c | 549 | __hf, __eql, __a, __unique_keys{}) |
4dad8b49 BK |
550 | { } |
551 | ||
3b2524b1 | 552 | _Hashtable& |
0462b6aa | 553 | operator=(const _Hashtable& __ht); |
417e896e PC |
554 | |
555 | _Hashtable& | |
556 | operator=(_Hashtable&& __ht) | |
a2b5fdcb | 557 | noexcept(__node_alloc_traits::_S_nothrow_move() |
4797a61c | 558 | && is_nothrow_move_assignable<_Hash>::value |
a2b5fdcb | 559 | && is_nothrow_move_assignable<_Equal>::value) |
417e896e | 560 | { |
4797a61c | 561 | constexpr bool __move_storage = |
a2b5fdcb JW |
562 | __node_alloc_traits::_S_propagate_on_move_assign() |
563 | || __node_alloc_traits::_S_always_equal(); | |
564 | _M_move_assign(std::move(__ht), __bool_constant<__move_storage>()); | |
417e896e PC |
565 | return *this; |
566 | } | |
3b2524b1 | 567 | |
4dad8b49 BK |
568 | _Hashtable& |
569 | operator=(initializer_list<value_type> __l) | |
570 | { | |
7cfe71d1 | 571 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
b09bcf83 | 572 | _M_before_begin._M_nxt = nullptr; |
0462b6aa | 573 | clear(); |
6dcf0423 FD |
574 | |
575 | // We consider that all elements of __l are going to be inserted. | |
576 | auto __l_bkt_count = _M_rehash_policy._M_bkt_for_elements(__l.size()); | |
577 | ||
578 | // Do not shrink to keep potential user reservation. | |
579 | if (_M_bucket_count < __l_bkt_count) | |
580 | rehash(__l_bkt_count); | |
581 | ||
582 | this->_M_insert_range(__l.begin(), __l.end(), __roan, __unique_keys{}); | |
4dad8b49 BK |
583 | return *this; |
584 | } | |
585 | ||
6f59ea25 | 586 | ~_Hashtable() noexcept; |
3b2524b1 | 587 | |
0462b6aa FD |
588 | void |
589 | swap(_Hashtable&) | |
4797a61c FD |
590 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
591 | __is_nothrow_swappable<_Equal>>::value); | |
3b2524b1 PC |
592 | |
593 | // Basic container operations | |
594 | iterator | |
d3677132 | 595 | begin() noexcept |
f86b266c | 596 | { return iterator(_M_begin()); } |
3b2524b1 PC |
597 | |
598 | const_iterator | |
d3677132 | 599 | begin() const noexcept |
f86b266c | 600 | { return const_iterator(_M_begin()); } |
3b2524b1 PC |
601 | |
602 | iterator | |
d3677132 | 603 | end() noexcept |
da29608a | 604 | { return iterator(nullptr); } |
3b2524b1 PC |
605 | |
606 | const_iterator | |
d3677132 | 607 | end() const noexcept |
da29608a | 608 | { return const_iterator(nullptr); } |
3b2524b1 PC |
609 | |
610 | const_iterator | |
d3677132 | 611 | cbegin() const noexcept |
f86b266c | 612 | { return const_iterator(_M_begin()); } |
3b2524b1 PC |
613 | |
614 | const_iterator | |
d3677132 | 615 | cend() const noexcept |
da29608a | 616 | { return const_iterator(nullptr); } |
3b2524b1 PC |
617 | |
618 | size_type | |
d3677132 | 619 | size() const noexcept |
3b2524b1 | 620 | { return _M_element_count; } |
7c3e9502 | 621 | |
d715f554 | 622 | _GLIBCXX_NODISCARD bool |
d3677132 | 623 | empty() const noexcept |
3b2524b1 PC |
624 | { return size() == 0; } |
625 | ||
626 | allocator_type | |
d3677132 | 627 | get_allocator() const noexcept |
b09bcf83 | 628 | { return allocator_type(this->_M_node_allocator()); } |
3b2524b1 | 629 | |
3b2524b1 | 630 | size_type |
d3677132 | 631 | max_size() const noexcept |
b09bcf83 | 632 | { return __node_alloc_traits::max_size(this->_M_node_allocator()); } |
3b2524b1 PC |
633 | |
634 | // Observers | |
635 | key_equal | |
636 | key_eq() const | |
f7d6ad0a | 637 | { return this->_M_eq(); } |
3b2524b1 PC |
638 | |
639 | // hash_function, if present, comes from _Hash_code_base. | |
640 | ||
641 | // Bucket operations | |
642 | size_type | |
d3677132 | 643 | bucket_count() const noexcept |
3b2524b1 | 644 | { return _M_bucket_count; } |
7c3e9502 | 645 | |
3b2524b1 | 646 | size_type |
d3677132 | 647 | max_bucket_count() const noexcept |
3b2524b1 | 648 | { return max_size(); } |
7c3e9502 | 649 | |
3b2524b1 | 650 | size_type |
7cfe71d1 FD |
651 | bucket_size(size_type __bkt) const |
652 | { return std::distance(begin(__bkt), end(__bkt)); } | |
7c3e9502 | 653 | |
3b2524b1 PC |
654 | size_type |
655 | bucket(const key_type& __k) const | |
4797a61c | 656 | { return _M_bucket_index(this->_M_hash_code(__k)); } |
3b2524b1 PC |
657 | |
658 | local_iterator | |
7cfe71d1 | 659 | begin(size_type __bkt) |
5b3be7cf | 660 | { |
7cfe71d1 FD |
661 | return local_iterator(*this, _M_bucket_begin(__bkt), |
662 | __bkt, _M_bucket_count); | |
5b3be7cf | 663 | } |
3b2524b1 PC |
664 | |
665 | local_iterator | |
7cfe71d1 FD |
666 | end(size_type __bkt) |
667 | { return local_iterator(*this, nullptr, __bkt, _M_bucket_count); } | |
3b2524b1 PC |
668 | |
669 | const_local_iterator | |
7cfe71d1 | 670 | begin(size_type __bkt) const |
5b3be7cf | 671 | { |
7cfe71d1 FD |
672 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
673 | __bkt, _M_bucket_count); | |
5b3be7cf | 674 | } |
3b2524b1 PC |
675 | |
676 | const_local_iterator | |
7cfe71d1 FD |
677 | end(size_type __bkt) const |
678 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } | |
3b2524b1 PC |
679 | |
680 | // DR 691. | |
681 | const_local_iterator | |
7cfe71d1 | 682 | cbegin(size_type __bkt) const |
5b3be7cf | 683 | { |
7cfe71d1 FD |
684 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
685 | __bkt, _M_bucket_count); | |
5b3be7cf | 686 | } |
3b2524b1 PC |
687 | |
688 | const_local_iterator | |
7cfe71d1 FD |
689 | cend(size_type __bkt) const |
690 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } | |
3b2524b1 PC |
691 | |
692 | float | |
d3677132 | 693 | load_factor() const noexcept |
7c3e9502 | 694 | { |
3b2524b1 PC |
695 | return static_cast<float>(size()) / static_cast<float>(bucket_count()); |
696 | } | |
697 | ||
698 | // max_load_factor, if present, comes from _Rehash_base. | |
699 | ||
4dad8b49 BK |
700 | // Generalization of max_load_factor. Extension, not found in |
701 | // TR1. Only useful if _RehashPolicy is something other than | |
702 | // the default. | |
3b2524b1 PC |
703 | const _RehashPolicy& |
704 | __rehash_policy() const | |
705 | { return _M_rehash_policy; } | |
7c3e9502 BK |
706 | |
707 | void | |
291e91da FD |
708 | __rehash_policy(const _RehashPolicy& __pol) |
709 | { _M_rehash_policy = __pol; } | |
3b2524b1 PC |
710 | |
711 | // Lookup. | |
712 | iterator | |
713 | find(const key_type& __k); | |
714 | ||
715 | const_iterator | |
716 | find(const key_type& __k) const; | |
717 | ||
718 | size_type | |
719 | count(const key_type& __k) const; | |
720 | ||
721 | std::pair<iterator, iterator> | |
722 | equal_range(const key_type& __k); | |
723 | ||
724 | std::pair<const_iterator, const_iterator> | |
725 | equal_range(const key_type& __k) const; | |
726 | ||
f9d98fa7 | 727 | private: |
f86b266c | 728 | // Bucket index computation helpers. |
a188284c | 729 | size_type |
1b6f0476 | 730 | _M_bucket_index(const __node_value_type& __n) const noexcept |
4dad8b49 | 731 | { return __hash_code_base::_M_bucket_index(__n, _M_bucket_count); } |
a188284c FD |
732 | |
733 | size_type | |
4797a61c FD |
734 | _M_bucket_index(__hash_code __c) const |
735 | { return __hash_code_base::_M_bucket_index(__c, _M_bucket_count); } | |
a188284c | 736 | |
1b4ec7f0 | 737 | // Find and insert helper functions and types |
f86b266c | 738 | // Find the node before the one matching the criteria. |
1b6f0476 | 739 | __node_base_ptr |
4dad8b49 | 740 | _M_find_before_node(size_type, const key_type&, __hash_code) const; |
f86b266c | 741 | |
1b6f0476 | 742 | __node_ptr |
f86b266c | 743 | _M_find_node(size_type __bkt, const key_type& __key, |
4dad8b49 | 744 | __hash_code __c) const |
f86b266c | 745 | { |
1b6f0476 | 746 | __node_base_ptr __before_n = _M_find_before_node(__bkt, __key, __c); |
f86b266c | 747 | if (__before_n) |
1b6f0476 | 748 | return static_cast<__node_ptr>(__before_n->_M_nxt); |
f86b266c FD |
749 | return nullptr; |
750 | } | |
fb7342fd | 751 | |
f86b266c | 752 | // Insert a node at the beginning of a bucket. |
da29608a | 753 | void |
1b6f0476 | 754 | _M_insert_bucket_begin(size_type, __node_ptr); |
da29608a | 755 | |
da29608a FD |
756 | // Remove the bucket first node |
757 | void | |
1b6f0476 | 758 | _M_remove_bucket_begin(size_type __bkt, __node_ptr __next_n, |
da29608a FD |
759 | size_type __next_bkt); |
760 | ||
761 | // Get the node before __n in the bucket __bkt | |
1b6f0476 FD |
762 | __node_base_ptr |
763 | _M_get_previous_node(size_type __bkt, __node_ptr __n); | |
da29608a | 764 | |
4797a61c FD |
765 | // Insert node __n with hash code __code, in bucket __bkt if no |
766 | // rehash (assumes no element with same key already present). | |
b0c849fa | 767 | // Takes ownership of __n if insertion succeeds, throws otherwise. |
181a5a13 | 768 | iterator |
4797a61c | 769 | _M_insert_unique_node(size_type __bkt, __hash_code, |
1b6f0476 | 770 | __node_ptr __n, size_type __n_elt = 1); |
fb7342fd | 771 | |
b0c849fa FD |
772 | // Insert node __n with key __k and hash code __code. |
773 | // Takes ownership of __n if insertion succeeds, throws otherwise. | |
181a5a13 | 774 | iterator |
1b6f0476 FD |
775 | _M_insert_multi_node(__node_ptr __hint, |
776 | __hash_code __code, __node_ptr __n); | |
3b2524b1 | 777 | |
9f285ccb JM |
778 | template<typename... _Args> |
779 | std::pair<iterator, bool> | |
4797a61c | 780 | _M_emplace(true_type __uks, _Args&&... __args); |
9b81593b | 781 | |
9f285ccb JM |
782 | template<typename... _Args> |
783 | iterator | |
4797a61c FD |
784 | _M_emplace(false_type __uks, _Args&&... __args) |
785 | { return _M_emplace(cend(), __uks, std::forward<_Args>(__args)...); } | |
41349aec FD |
786 | |
787 | // Emplace with hint, useless when keys are unique. | |
788 | template<typename... _Args> | |
789 | iterator | |
6dcf0423 FD |
790 | _M_emplace(const_iterator, true_type __uks, _Args&&... __args) |
791 | { return _M_emplace(__uks, std::forward<_Args>(__args)...).first; } | |
41349aec FD |
792 | |
793 | template<typename... _Args> | |
794 | iterator | |
6dcf0423 | 795 | _M_emplace(const_iterator, false_type __uks, _Args&&... __args); |
9b81593b | 796 | |
b3abc9d8 | 797 | template<typename _Arg, typename _NodeGenerator> |
1c299612 | 798 | std::pair<iterator, bool> |
6dcf0423 | 799 | _M_insert(_Arg&&, const _NodeGenerator&, true_type __uks); |
1c299612 | 800 | |
b3abc9d8 | 801 | template<typename _Arg, typename _NodeGenerator> |
1c299612 | 802 | iterator |
b3abc9d8 | 803 | _M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen, |
6dcf0423 | 804 | false_type __uks) |
b3abc9d8 FD |
805 | { |
806 | return _M_insert(cend(), std::forward<_Arg>(__arg), __node_gen, | |
6dcf0423 | 807 | __uks); |
b3abc9d8 | 808 | } |
41349aec FD |
809 | |
810 | // Insert with hint, not used when keys are unique. | |
b3abc9d8 | 811 | template<typename _Arg, typename _NodeGenerator> |
41349aec | 812 | iterator |
db97b3b0 | 813 | _M_insert(const_iterator, _Arg&& __arg, |
6dcf0423 | 814 | const _NodeGenerator& __node_gen, true_type __uks) |
b3abc9d8 FD |
815 | { |
816 | return | |
6dcf0423 | 817 | _M_insert(std::forward<_Arg>(__arg), __node_gen, __uks).first; |
b3abc9d8 | 818 | } |
41349aec FD |
819 | |
820 | // Insert with hint when keys are not unique. | |
b3abc9d8 | 821 | template<typename _Arg, typename _NodeGenerator> |
41349aec | 822 | iterator |
db97b3b0 | 823 | _M_insert(const_iterator, _Arg&&, |
6dcf0423 | 824 | const _NodeGenerator&, false_type __uks); |
1c299612 | 825 | |
31578792 | 826 | size_type |
4797a61c | 827 | _M_erase(true_type __uks, const key_type&); |
31578792 FD |
828 | |
829 | size_type | |
4797a61c | 830 | _M_erase(false_type __uks, const key_type&); |
31578792 FD |
831 | |
832 | iterator | |
1b6f0476 | 833 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n); |
31578792 | 834 | |
1b4ec7f0 | 835 | public: |
4dad8b49 | 836 | // Emplace |
9b81593b | 837 | template<typename... _Args> |
4dad8b49 | 838 | __ireturn_type |
9b81593b | 839 | emplace(_Args&&... __args) |
4797a61c | 840 | { return _M_emplace(__unique_keys{}, std::forward<_Args>(__args)...); } |
9b81593b FD |
841 | |
842 | template<typename... _Args> | |
843 | iterator | |
41349aec FD |
844 | emplace_hint(const_iterator __hint, _Args&&... __args) |
845 | { | |
4797a61c | 846 | return _M_emplace(__hint, __unique_keys{}, |
9f285ccb | 847 | std::forward<_Args>(__args)...); |
41349aec | 848 | } |
9b81593b | 849 | |
4dad8b49 | 850 | // Insert member functions via inheritance. |
3b2524b1 | 851 | |
4dad8b49 | 852 | // Erase |
d723ced2 | 853 | iterator |
3b2524b1 PC |
854 | erase(const_iterator); |
855 | ||
6dc88283 PC |
856 | // LWG 2059. |
857 | iterator | |
858 | erase(iterator __it) | |
859 | { return erase(const_iterator(__it)); } | |
860 | ||
3b2524b1 | 861 | size_type |
31578792 | 862 | erase(const key_type& __k) |
4797a61c | 863 | { return _M_erase(__unique_keys{}, __k); } |
e133ace8 | 864 | |
d723ced2 | 865 | iterator |
3b2524b1 PC |
866 | erase(const_iterator, const_iterator); |
867 | ||
868 | void | |
d3677132 | 869 | clear() noexcept; |
3b2524b1 | 870 | |
7cfe71d1 FD |
871 | // Set number of buckets keeping it appropriate for container's number |
872 | // of elements. | |
873 | void rehash(size_type __bkt_count); | |
9155c0e3 PC |
874 | |
875 | // DR 1189. | |
876 | // reserve, if present, comes from _Rehash_base. | |
877 | ||
2dbe56bd JW |
878 | #if __cplusplus > 201402L |
879 | /// Re-insert an extracted node into a container with unique keys. | |
880 | insert_return_type | |
881 | _M_reinsert_node(node_type&& __nh) | |
882 | { | |
883 | insert_return_type __ret; | |
884 | if (__nh.empty()) | |
885 | __ret.position = end(); | |
886 | else | |
887 | { | |
888 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); | |
889 | ||
890 | const key_type& __k = __nh._M_key(); | |
891 | __hash_code __code = this->_M_hash_code(__k); | |
4797a61c | 892 | size_type __bkt = _M_bucket_index(__code); |
1b6f0476 | 893 | if (__node_ptr __n = _M_find_node(__bkt, __k, __code)) |
2dbe56bd JW |
894 | { |
895 | __ret.node = std::move(__nh); | |
896 | __ret.position = iterator(__n); | |
897 | __ret.inserted = false; | |
898 | } | |
899 | else | |
900 | { | |
901 | __ret.position | |
4797a61c | 902 | = _M_insert_unique_node(__bkt, __code, __nh._M_ptr); |
2dbe56bd JW |
903 | __nh._M_ptr = nullptr; |
904 | __ret.inserted = true; | |
905 | } | |
906 | } | |
907 | return __ret; | |
908 | } | |
909 | ||
910 | /// Re-insert an extracted node into a container with equivalent keys. | |
911 | iterator | |
912 | _M_reinsert_node_multi(const_iterator __hint, node_type&& __nh) | |
913 | { | |
2dbe56bd | 914 | if (__nh.empty()) |
b0c849fa | 915 | return end(); |
2dbe56bd | 916 | |
b0c849fa FD |
917 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); |
918 | ||
919 | const key_type& __k = __nh._M_key(); | |
920 | auto __code = this->_M_hash_code(__k); | |
921 | auto __ret | |
4797a61c | 922 | = _M_insert_multi_node(__hint._M_cur, __code, __nh._M_ptr); |
b0c849fa | 923 | __nh._M_ptr = nullptr; |
2dbe56bd JW |
924 | return __ret; |
925 | } | |
926 | ||
b0c849fa | 927 | private: |
2dbe56bd | 928 | node_type |
1b6f0476 | 929 | _M_extract_node(size_t __bkt, __node_base_ptr __prev_n) |
2dbe56bd | 930 | { |
1b6f0476 | 931 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
2dbe56bd JW |
932 | if (__prev_n == _M_buckets[__bkt]) |
933 | _M_remove_bucket_begin(__bkt, __n->_M_next(), | |
1b6f0476 | 934 | __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
2dbe56bd JW |
935 | else if (__n->_M_nxt) |
936 | { | |
1b6f0476 | 937 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
2dbe56bd JW |
938 | if (__next_bkt != __bkt) |
939 | _M_buckets[__next_bkt] = __prev_n; | |
940 | } | |
941 | ||
942 | __prev_n->_M_nxt = __n->_M_nxt; | |
943 | __n->_M_nxt = nullptr; | |
944 | --_M_element_count; | |
945 | return { __n, this->_M_node_allocator() }; | |
946 | } | |
947 | ||
b0c849fa FD |
948 | public: |
949 | // Extract a node. | |
950 | node_type | |
951 | extract(const_iterator __pos) | |
952 | { | |
1b6f0476 | 953 | size_t __bkt = _M_bucket_index(*__pos._M_cur); |
b0c849fa FD |
954 | return _M_extract_node(__bkt, |
955 | _M_get_previous_node(__bkt, __pos._M_cur)); | |
956 | } | |
957 | ||
2dbe56bd JW |
958 | /// Extract a node. |
959 | node_type | |
960 | extract(const _Key& __k) | |
961 | { | |
962 | node_type __nh; | |
b0c849fa | 963 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 964 | std::size_t __bkt = _M_bucket_index(__code); |
1b6f0476 | 965 | if (__node_base_ptr __prev_node = _M_find_before_node(__bkt, __k, __code)) |
b0c849fa | 966 | __nh = _M_extract_node(__bkt, __prev_node); |
2dbe56bd JW |
967 | return __nh; |
968 | } | |
969 | ||
970 | /// Merge from a compatible container into one with unique keys. | |
971 | template<typename _Compatible_Hashtable> | |
972 | void | |
973 | _M_merge_unique(_Compatible_Hashtable& __src) noexcept | |
974 | { | |
975 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, | |
976 | node_type>, "Node types are compatible"); | |
977 | __glibcxx_assert(get_allocator() == __src.get_allocator()); | |
978 | ||
0f146257 | 979 | auto __n_elt = __src.size(); |
2dbe56bd JW |
980 | for (auto __i = __src.begin(), __end = __src.end(); __i != __end;) |
981 | { | |
982 | auto __pos = __i++; | |
4797a61c | 983 | const key_type& __k = _ExtractKey{}(*__pos); |
2dbe56bd | 984 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 985 | size_type __bkt = _M_bucket_index(__code); |
2dbe56bd JW |
986 | if (_M_find_node(__bkt, __k, __code) == nullptr) |
987 | { | |
988 | auto __nh = __src.extract(__pos); | |
4797a61c | 989 | _M_insert_unique_node(__bkt, __code, __nh._M_ptr, __n_elt); |
2dbe56bd | 990 | __nh._M_ptr = nullptr; |
0f146257 | 991 | __n_elt = 1; |
2dbe56bd | 992 | } |
0f146257 FD |
993 | else if (__n_elt != 1) |
994 | --__n_elt; | |
2dbe56bd JW |
995 | } |
996 | } | |
997 | ||
998 | /// Merge from a compatible container into one with equivalent keys. | |
999 | template<typename _Compatible_Hashtable> | |
1000 | void | |
1001 | _M_merge_multi(_Compatible_Hashtable& __src) noexcept | |
1002 | { | |
1003 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, | |
1004 | node_type>, "Node types are compatible"); | |
1005 | __glibcxx_assert(get_allocator() == __src.get_allocator()); | |
1006 | ||
1007 | this->reserve(size() + __src.size()); | |
1008 | for (auto __i = __src.begin(), __end = __src.end(); __i != __end;) | |
1009 | _M_reinsert_node_multi(cend(), __src.extract(__i++)); | |
1010 | } | |
1011 | #endif // C++17 | |
1012 | ||
3b2524b1 | 1013 | private: |
ac0ab963 | 1014 | // Helper rehash method used when keys are unique. |
4797a61c | 1015 | void _M_rehash_aux(size_type __bkt_count, true_type __uks); |
ac0ab963 FD |
1016 | |
1017 | // Helper rehash method used when keys can be non-unique. | |
4797a61c | 1018 | void _M_rehash_aux(size_type __bkt_count, false_type __uks); |
ac0ab963 | 1019 | |
4dad8b49 BK |
1020 | // Unconditionally change size of bucket array to n, restore |
1021 | // hash policy state to __state on exception. | |
7cfe71d1 | 1022 | void _M_rehash(size_type __bkt_count, const __rehash_state& __state); |
3b2524b1 PC |
1023 | }; |
1024 | ||
1025 | ||
1026 | // Definitions of class template _Hashtable's out-of-line member functions. | |
4797a61c FD |
1027 | template<typename _Key, typename _Value, typename _Alloc, |
1028 | typename _ExtractKey, typename _Equal, | |
1029 | typename _Hash, typename _RangeHash, typename _Unused, | |
1030 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1031 | auto |
4dad8b49 | 1032 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1033 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
da29608a | 1034 | _M_bucket_begin(size_type __bkt) const |
1b6f0476 | 1035 | -> __node_ptr |
da29608a | 1036 | { |
1b6f0476 FD |
1037 | __node_base_ptr __n = _M_buckets[__bkt]; |
1038 | return __n ? static_cast<__node_ptr>(__n->_M_nxt) : nullptr; | |
da29608a FD |
1039 | } |
1040 | ||
4797a61c FD |
1041 | template<typename _Key, typename _Value, typename _Alloc, |
1042 | typename _ExtractKey, typename _Equal, | |
1043 | typename _Hash, typename _RangeHash, typename _Unused, | |
1044 | typename _RehashPolicy, typename _Traits> | |
4dad8b49 | 1045 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1046 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 1047 | _Hashtable(size_type __bkt_count_hint, |
4797a61c FD |
1048 | const _Hash& __h, const _Equal& __eq, const allocator_type& __a) |
1049 | : _Hashtable(__h, __eq, __a) | |
3b2524b1 | 1050 | { |
7cfe71d1 FD |
1051 | auto __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count_hint); |
1052 | if (__bkt_count > _M_bucket_count) | |
da27f556 | 1053 | { |
7cfe71d1 FD |
1054 | _M_buckets = _M_allocate_buckets(__bkt_count); |
1055 | _M_bucket_count = __bkt_count; | |
da27f556 | 1056 | } |
3b2524b1 PC |
1057 | } |
1058 | ||
4797a61c FD |
1059 | template<typename _Key, typename _Value, typename _Alloc, |
1060 | typename _ExtractKey, typename _Equal, | |
1061 | typename _Hash, typename _RangeHash, typename _Unused, | |
1062 | typename _RehashPolicy, typename _Traits> | |
3b2524b1 | 1063 | template<typename _InputIterator> |
4dad8b49 | 1064 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1065 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1066 | _Hashtable(_InputIterator __f, _InputIterator __l, |
7cfe71d1 | 1067 | size_type __bkt_count_hint, |
4797a61c | 1068 | const _Hash& __h, const _Equal& __eq, |
6dcf0423 | 1069 | const allocator_type& __a, true_type /* __uks */) |
4797a61c | 1070 | : _Hashtable(__bkt_count_hint, __h, __eq, __a) |
6dcf0423 FD |
1071 | { |
1072 | for (; __f != __l; ++__f) | |
1073 | this->insert(*__f); | |
1074 | } | |
1075 | ||
4797a61c FD |
1076 | template<typename _Key, typename _Value, typename _Alloc, |
1077 | typename _ExtractKey, typename _Equal, | |
1078 | typename _Hash, typename _RangeHash, typename _Unused, | |
1079 | typename _RehashPolicy, typename _Traits> | |
6dcf0423 FD |
1080 | template<typename _InputIterator> |
1081 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1082 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
6dcf0423 FD |
1083 | _Hashtable(_InputIterator __f, _InputIterator __l, |
1084 | size_type __bkt_count_hint, | |
4797a61c | 1085 | const _Hash& __h, const _Equal& __eq, |
6dcf0423 | 1086 | const allocator_type& __a, false_type /* __uks */) |
4797a61c | 1087 | : _Hashtable(__h, __eq, __a) |
3b2524b1 | 1088 | { |
d4a7f7a1 | 1089 | auto __nb_elems = __detail::__distance_fw(__f, __l); |
da27f556 | 1090 | auto __bkt_count = |
d4a7f7a1 FD |
1091 | _M_rehash_policy._M_next_bkt( |
1092 | std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems), | |
7cfe71d1 | 1093 | __bkt_count_hint)); |
d4a7f7a1 | 1094 | |
da27f556 FD |
1095 | if (__bkt_count > _M_bucket_count) |
1096 | { | |
1097 | _M_buckets = _M_allocate_buckets(__bkt_count); | |
1098 | _M_bucket_count = __bkt_count; | |
1099 | } | |
1100 | ||
676c4146 JW |
1101 | for (; __f != __l; ++__f) |
1102 | this->insert(*__f); | |
3b2524b1 | 1103 | } |
7c3e9502 | 1104 | |
4797a61c FD |
1105 | template<typename _Key, typename _Value, typename _Alloc, |
1106 | typename _ExtractKey, typename _Equal, | |
1107 | typename _Hash, typename _RangeHash, typename _Unused, | |
1108 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1109 | auto |
0462b6aa | 1110 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1111 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
db97b3b0 JW |
1112 | operator=(const _Hashtable& __ht) |
1113 | -> _Hashtable& | |
1114 | { | |
1115 | if (&__ht == this) | |
1116 | return *this; | |
0462b6aa | 1117 | |
db97b3b0 JW |
1118 | if (__node_alloc_traits::_S_propagate_on_copy_assign()) |
1119 | { | |
1120 | auto& __this_alloc = this->_M_node_allocator(); | |
1121 | auto& __that_alloc = __ht._M_node_allocator(); | |
1122 | if (!__node_alloc_traits::_S_always_equal() | |
1123 | && __this_alloc != __that_alloc) | |
1124 | { | |
1125 | // Replacement allocator cannot free existing storage. | |
1126 | this->_M_deallocate_nodes(_M_begin()); | |
1127 | _M_before_begin._M_nxt = nullptr; | |
1128 | _M_deallocate_buckets(); | |
1129 | _M_buckets = nullptr; | |
1130 | std::__alloc_on_copy(__this_alloc, __that_alloc); | |
1131 | __hashtable_base::operator=(__ht); | |
1132 | _M_bucket_count = __ht._M_bucket_count; | |
1133 | _M_element_count = __ht._M_element_count; | |
1134 | _M_rehash_policy = __ht._M_rehash_policy; | |
b9c84e95 | 1135 | __alloc_node_gen_t __alloc_node_gen(*this); |
db97b3b0 JW |
1136 | __try |
1137 | { | |
b9c84e95 | 1138 | _M_assign(__ht, __alloc_node_gen); |
db97b3b0 JW |
1139 | } |
1140 | __catch(...) | |
1141 | { | |
1142 | // _M_assign took care of deallocating all memory. Now we | |
1143 | // must make sure this instance remains in a usable state. | |
1144 | _M_reset(); | |
1145 | __throw_exception_again; | |
1146 | } | |
1147 | return *this; | |
1148 | } | |
1149 | std::__alloc_on_copy(__this_alloc, __that_alloc); | |
1150 | } | |
0462b6aa | 1151 | |
db97b3b0 | 1152 | // Reuse allocated buckets and nodes. |
b9c84e95 | 1153 | _M_assign_elements(__ht); |
01021139 FD |
1154 | return *this; |
1155 | } | |
db97b3b0 | 1156 | |
4797a61c FD |
1157 | template<typename _Key, typename _Value, typename _Alloc, |
1158 | typename _ExtractKey, typename _Equal, | |
1159 | typename _Hash, typename _RangeHash, typename _Unused, | |
1160 | typename _RehashPolicy, typename _Traits> | |
b9c84e95 | 1161 | template<typename _Ht> |
01021139 FD |
1162 | void |
1163 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1164 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
b9c84e95 | 1165 | _M_assign_elements(_Ht&& __ht) |
01021139 | 1166 | { |
1b6f0476 | 1167 | __buckets_ptr __former_buckets = nullptr; |
01021139 FD |
1168 | std::size_t __former_bucket_count = _M_bucket_count; |
1169 | const __rehash_state& __former_state = _M_rehash_policy._M_state(); | |
db97b3b0 | 1170 | |
01021139 FD |
1171 | if (_M_bucket_count != __ht._M_bucket_count) |
1172 | { | |
1173 | __former_buckets = _M_buckets; | |
1174 | _M_buckets = _M_allocate_buckets(__ht._M_bucket_count); | |
1175 | _M_bucket_count = __ht._M_bucket_count; | |
1176 | } | |
1177 | else | |
0462b6aa | 1178 | __builtin_memset(_M_buckets, 0, |
1b6f0476 | 1179 | _M_bucket_count * sizeof(__node_base_ptr)); |
01021139 FD |
1180 | |
1181 | __try | |
1182 | { | |
1183 | __hashtable_base::operator=(std::forward<_Ht>(__ht)); | |
1184 | _M_element_count = __ht._M_element_count; | |
1185 | _M_rehash_policy = __ht._M_rehash_policy; | |
7cfe71d1 | 1186 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
01021139 | 1187 | _M_before_begin._M_nxt = nullptr; |
b9c84e95 | 1188 | _M_assign(std::forward<_Ht>(__ht), __roan); |
01021139 FD |
1189 | if (__former_buckets) |
1190 | _M_deallocate_buckets(__former_buckets, __former_bucket_count); | |
1191 | } | |
1192 | __catch(...) | |
1193 | { | |
1194 | if (__former_buckets) | |
1195 | { | |
1196 | // Restore previous buckets. | |
1197 | _M_deallocate_buckets(); | |
1198 | _M_rehash_policy._M_reset(__former_state); | |
1199 | _M_buckets = __former_buckets; | |
1200 | _M_bucket_count = __former_bucket_count; | |
1201 | } | |
1202 | __builtin_memset(_M_buckets, 0, | |
1b6f0476 | 1203 | _M_bucket_count * sizeof(__node_base_ptr)); |
01021139 FD |
1204 | __throw_exception_again; |
1205 | } | |
1206 | } | |
0462b6aa | 1207 | |
4797a61c FD |
1208 | template<typename _Key, typename _Value, typename _Alloc, |
1209 | typename _ExtractKey, typename _Equal, | |
1210 | typename _Hash, typename _RangeHash, typename _Unused, | |
1211 | typename _RehashPolicy, typename _Traits> | |
b9c84e95 | 1212 | template<typename _Ht, typename _NodeGenerator> |
0462b6aa FD |
1213 | void |
1214 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1215 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
b9c84e95 | 1216 | _M_assign(_Ht&& __ht, const _NodeGenerator& __node_gen) |
0462b6aa | 1217 | { |
1b6f0476 | 1218 | __buckets_ptr __buckets = nullptr; |
0462b6aa | 1219 | if (!_M_buckets) |
95539f21 | 1220 | _M_buckets = __buckets = _M_allocate_buckets(_M_bucket_count); |
0462b6aa FD |
1221 | |
1222 | __try | |
1223 | { | |
b09bcf83 | 1224 | if (!__ht._M_before_begin._M_nxt) |
0462b6aa FD |
1225 | return; |
1226 | ||
1227 | // First deal with the special first node pointed to by | |
1228 | // _M_before_begin. | |
1b6f0476 FD |
1229 | __node_ptr __ht_n = __ht._M_begin(); |
1230 | __node_ptr __this_n | |
b9c84e95 | 1231 | = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
1b6f0476 | 1232 | this->_M_copy_code(*__this_n, *__ht_n); |
f9d98fa7 | 1233 | _M_update_bbegin(__this_n); |
0462b6aa FD |
1234 | |
1235 | // Then deal with other nodes. | |
1b6f0476 | 1236 | __node_ptr __prev_n = __this_n; |
0462b6aa FD |
1237 | for (__ht_n = __ht_n->_M_next(); __ht_n; __ht_n = __ht_n->_M_next()) |
1238 | { | |
b9c84e95 | 1239 | __this_n = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
0462b6aa | 1240 | __prev_n->_M_nxt = __this_n; |
1b6f0476 FD |
1241 | this->_M_copy_code(*__this_n, *__ht_n); |
1242 | size_type __bkt = _M_bucket_index(*__this_n); | |
0462b6aa FD |
1243 | if (!_M_buckets[__bkt]) |
1244 | _M_buckets[__bkt] = __prev_n; | |
1245 | __prev_n = __this_n; | |
1246 | } | |
1247 | } | |
1248 | __catch(...) | |
1249 | { | |
1250 | clear(); | |
1251 | if (__buckets) | |
1252 | _M_deallocate_buckets(); | |
1253 | __throw_exception_again; | |
1254 | } | |
1255 | } | |
1256 | ||
4797a61c FD |
1257 | template<typename _Key, typename _Value, typename _Alloc, |
1258 | typename _ExtractKey, typename _Equal, | |
1259 | typename _Hash, typename _RangeHash, typename _Unused, | |
1260 | typename _RehashPolicy, typename _Traits> | |
0462b6aa FD |
1261 | void |
1262 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1263 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
0462b6aa FD |
1264 | _M_reset() noexcept |
1265 | { | |
1266 | _M_rehash_policy._M_reset(); | |
95539f21 FD |
1267 | _M_bucket_count = 1; |
1268 | _M_single_bucket = nullptr; | |
1269 | _M_buckets = &_M_single_bucket; | |
b09bcf83 | 1270 | _M_before_begin._M_nxt = nullptr; |
0462b6aa FD |
1271 | _M_element_count = 0; |
1272 | } | |
1273 | ||
4797a61c FD |
1274 | template<typename _Key, typename _Value, typename _Alloc, |
1275 | typename _ExtractKey, typename _Equal, | |
1276 | typename _Hash, typename _RangeHash, typename _Unused, | |
1277 | typename _RehashPolicy, typename _Traits> | |
0462b6aa FD |
1278 | void |
1279 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1280 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 1281 | _M_move_assign(_Hashtable&& __ht, true_type) |
0462b6aa | 1282 | { |
c2fb0a1a JW |
1283 | if (__builtin_expect(std::__addressof(__ht) == this, false)) |
1284 | return; | |
1285 | ||
b09bcf83 | 1286 | this->_M_deallocate_nodes(_M_begin()); |
95539f21 | 1287 | _M_deallocate_buckets(); |
0462b6aa FD |
1288 | __hashtable_base::operator=(std::move(__ht)); |
1289 | _M_rehash_policy = __ht._M_rehash_policy; | |
95539f21 FD |
1290 | if (!__ht._M_uses_single_bucket()) |
1291 | _M_buckets = __ht._M_buckets; | |
1292 | else | |
1293 | { | |
1294 | _M_buckets = &_M_single_bucket; | |
1295 | _M_single_bucket = __ht._M_single_bucket; | |
1296 | } | |
f9d98fa7 | 1297 | |
0462b6aa | 1298 | _M_bucket_count = __ht._M_bucket_count; |
b09bcf83 | 1299 | _M_before_begin._M_nxt = __ht._M_before_begin._M_nxt; |
0462b6aa | 1300 | _M_element_count = __ht._M_element_count; |
b09bcf83 | 1301 | std::__alloc_on_move(this->_M_node_allocator(), __ht._M_node_allocator()); |
0462b6aa | 1302 | |
f9d98fa7 FD |
1303 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
1304 | _M_update_bbegin(); | |
0462b6aa FD |
1305 | __ht._M_reset(); |
1306 | } | |
1307 | ||
4797a61c FD |
1308 | template<typename _Key, typename _Value, typename _Alloc, |
1309 | typename _ExtractKey, typename _Equal, | |
1310 | typename _Hash, typename _RangeHash, typename _Unused, | |
1311 | typename _RehashPolicy, typename _Traits> | |
0462b6aa FD |
1312 | void |
1313 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, | |
4797a61c | 1314 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 1315 | _M_move_assign(_Hashtable&& __ht, false_type) |
0462b6aa | 1316 | { |
b09bcf83 | 1317 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
4797a61c | 1318 | _M_move_assign(std::move(__ht), true_type{}); |
0462b6aa FD |
1319 | else |
1320 | { | |
1321 | // Can't move memory, move elements then. | |
b9c84e95 | 1322 | _M_assign_elements(std::move(__ht)); |
01021139 | 1323 | __ht.clear(); |
0462b6aa FD |
1324 | } |
1325 | } | |
1326 | ||
4797a61c FD |
1327 | template<typename _Key, typename _Value, typename _Alloc, |
1328 | typename _ExtractKey, typename _Equal, | |
1329 | typename _Hash, typename _RangeHash, typename _Unused, | |
1330 | typename _RehashPolicy, typename _Traits> | |
4dad8b49 | 1331 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1332 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1333 | _Hashtable(const _Hashtable& __ht) |
4dad8b49 BK |
1334 | : __hashtable_base(__ht), |
1335 | __map_base(__ht), | |
1336 | __rehash_base(__ht), | |
b09bcf83 FD |
1337 | __hashtable_alloc( |
1338 | __node_alloc_traits::_S_select_on_copy(__ht._M_node_allocator())), | |
da27f556 | 1339 | _M_buckets(nullptr), |
3b2524b1 PC |
1340 | _M_bucket_count(__ht._M_bucket_count), |
1341 | _M_element_count(__ht._M_element_count), | |
1342 | _M_rehash_policy(__ht._M_rehash_policy) | |
1343 | { | |
b9c84e95 FD |
1344 | __alloc_node_gen_t __alloc_node_gen(*this); |
1345 | _M_assign(__ht, __alloc_node_gen); | |
3b2524b1 PC |
1346 | } |
1347 | ||
4797a61c FD |
1348 | template<typename _Key, typename _Value, typename _Alloc, |
1349 | typename _ExtractKey, typename _Equal, | |
1350 | typename _Hash, typename _RangeHash, typename _Unused, | |
1351 | typename _RehashPolicy, typename _Traits> | |
4dad8b49 | 1352 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1353 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
12324b9a FD |
1354 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
1355 | true_type /* alloc always equal */) | |
4797a61c | 1356 | noexcept(std::is_nothrow_copy_constructible<_Hash>::value && |
12324b9a | 1357 | std::is_nothrow_copy_constructible<_Equal>::value) |
4dad8b49 BK |
1358 | : __hashtable_base(__ht), |
1359 | __map_base(__ht), | |
1360 | __rehash_base(__ht), | |
12324b9a | 1361 | __hashtable_alloc(std::move(__a)), |
20b84bef | 1362 | _M_buckets(__ht._M_buckets), |
3b2524b1 | 1363 | _M_bucket_count(__ht._M_bucket_count), |
b09bcf83 | 1364 | _M_before_begin(__ht._M_before_begin._M_nxt), |
3b2524b1 | 1365 | _M_element_count(__ht._M_element_count), |
20b84bef | 1366 | _M_rehash_policy(__ht._M_rehash_policy) |
3b2524b1 | 1367 | { |
12324b9a | 1368 | // Update buckets if __ht is using its single bucket. |
95539f21 FD |
1369 | if (__ht._M_uses_single_bucket()) |
1370 | { | |
1371 | _M_buckets = &_M_single_bucket; | |
1372 | _M_single_bucket = __ht._M_single_bucket; | |
1373 | } | |
1374 | ||
f9d98fa7 FD |
1375 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
1376 | _M_update_bbegin(); | |
95539f21 | 1377 | |
0462b6aa FD |
1378 | __ht._M_reset(); |
1379 | } | |
1380 | ||
4797a61c FD |
1381 | template<typename _Key, typename _Value, typename _Alloc, |
1382 | typename _ExtractKey, typename _Equal, | |
1383 | typename _Hash, typename _RangeHash, typename _Unused, | |
1384 | typename _RehashPolicy, typename _Traits> | |
0462b6aa | 1385 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1386 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
0462b6aa FD |
1387 | _Hashtable(const _Hashtable& __ht, const allocator_type& __a) |
1388 | : __hashtable_base(__ht), | |
1389 | __map_base(__ht), | |
1390 | __rehash_base(__ht), | |
b09bcf83 | 1391 | __hashtable_alloc(__node_alloc_type(__a)), |
0462b6aa FD |
1392 | _M_buckets(), |
1393 | _M_bucket_count(__ht._M_bucket_count), | |
0462b6aa FD |
1394 | _M_element_count(__ht._M_element_count), |
1395 | _M_rehash_policy(__ht._M_rehash_policy) | |
1396 | { | |
b9c84e95 FD |
1397 | __alloc_node_gen_t __alloc_node_gen(*this); |
1398 | _M_assign(__ht, __alloc_node_gen); | |
0462b6aa FD |
1399 | } |
1400 | ||
4797a61c FD |
1401 | template<typename _Key, typename _Value, typename _Alloc, |
1402 | typename _ExtractKey, typename _Equal, | |
1403 | typename _Hash, typename _RangeHash, typename _Unused, | |
1404 | typename _RehashPolicy, typename _Traits> | |
0462b6aa | 1405 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1406 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
12324b9a FD |
1407 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
1408 | false_type /* alloc always equal */) | |
0462b6aa FD |
1409 | : __hashtable_base(__ht), |
1410 | __map_base(__ht), | |
1411 | __rehash_base(__ht), | |
12324b9a | 1412 | __hashtable_alloc(std::move(__a)), |
da27f556 | 1413 | _M_buckets(nullptr), |
0462b6aa | 1414 | _M_bucket_count(__ht._M_bucket_count), |
0462b6aa FD |
1415 | _M_element_count(__ht._M_element_count), |
1416 | _M_rehash_policy(__ht._M_rehash_policy) | |
1417 | { | |
b09bcf83 | 1418 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
0462b6aa | 1419 | { |
95539f21 FD |
1420 | if (__ht._M_uses_single_bucket()) |
1421 | { | |
1422 | _M_buckets = &_M_single_bucket; | |
1423 | _M_single_bucket = __ht._M_single_bucket; | |
1424 | } | |
1425 | else | |
1426 | _M_buckets = __ht._M_buckets; | |
1427 | ||
f9d98fa7 | 1428 | // Fix bucket containing the _M_before_begin pointer that can't be |
0462b6aa | 1429 | // moved. |
f9d98fa7 FD |
1430 | _M_update_bbegin(__ht._M_begin()); |
1431 | ||
0462b6aa FD |
1432 | __ht._M_reset(); |
1433 | } | |
1434 | else | |
1435 | { | |
b9c84e95 FD |
1436 | __alloc_node_gen_t __alloc_gen(*this); |
1437 | ||
1438 | using _Fwd_Ht = typename | |
1439 | conditional<__move_if_noexcept_cond<value_type>::value, | |
1440 | const _Hashtable&, _Hashtable&&>::type; | |
b32a3f32 | 1441 | _M_assign(std::forward<_Fwd_Ht>(__ht), __alloc_gen); |
0462b6aa FD |
1442 | __ht.clear(); |
1443 | } | |
3b2524b1 PC |
1444 | } |
1445 | ||
4797a61c FD |
1446 | template<typename _Key, typename _Value, typename _Alloc, |
1447 | typename _ExtractKey, typename _Equal, | |
1448 | typename _Hash, typename _RangeHash, typename _Unused, | |
1449 | typename _RehashPolicy, typename _Traits> | |
4dad8b49 | 1450 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1451 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
6f59ea25 | 1452 | ~_Hashtable() noexcept |
3b2524b1 PC |
1453 | { |
1454 | clear(); | |
da27f556 | 1455 | _M_deallocate_buckets(); |
3b2524b1 PC |
1456 | } |
1457 | ||
4797a61c FD |
1458 | template<typename _Key, typename _Value, typename _Alloc, |
1459 | typename _ExtractKey, typename _Equal, | |
1460 | typename _Hash, typename _RangeHash, typename _Unused, | |
1461 | typename _RehashPolicy, typename _Traits> | |
3b2524b1 | 1462 | void |
4dad8b49 | 1463 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1464 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1465 | swap(_Hashtable& __x) |
4797a61c FD |
1466 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
1467 | __is_nothrow_swappable<_Equal>>::value) | |
3b2524b1 | 1468 | { |
4dad8b49 BK |
1469 | // The only base class with member variables is hash_code_base. |
1470 | // We define _Hash_code_base::_M_swap because different | |
1471 | // specializations have different members. | |
a188284c | 1472 | this->_M_swap(__x); |
3b2524b1 | 1473 | |
b09bcf83 | 1474 | std::__alloc_on_swap(this->_M_node_allocator(), __x._M_node_allocator()); |
3b2524b1 | 1475 | std::swap(_M_rehash_policy, __x._M_rehash_policy); |
95539f21 FD |
1476 | |
1477 | // Deal properly with potentially moved instances. | |
1478 | if (this->_M_uses_single_bucket()) | |
1479 | { | |
1480 | if (!__x._M_uses_single_bucket()) | |
1481 | { | |
1482 | _M_buckets = __x._M_buckets; | |
1483 | __x._M_buckets = &__x._M_single_bucket; | |
1484 | } | |
1485 | } | |
1486 | else if (__x._M_uses_single_bucket()) | |
1487 | { | |
1488 | __x._M_buckets = _M_buckets; | |
1489 | _M_buckets = &_M_single_bucket; | |
1490 | } | |
1491 | else | |
1492 | std::swap(_M_buckets, __x._M_buckets); | |
1493 | ||
3b2524b1 | 1494 | std::swap(_M_bucket_count, __x._M_bucket_count); |
b09bcf83 | 1495 | std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt); |
3b2524b1 | 1496 | std::swap(_M_element_count, __x._M_element_count); |
95539f21 | 1497 | std::swap(_M_single_bucket, __x._M_single_bucket); |
4dad8b49 | 1498 | |
0462b6aa FD |
1499 | // Fix buckets containing the _M_before_begin pointers that can't be |
1500 | // swapped. | |
f9d98fa7 FD |
1501 | _M_update_bbegin(); |
1502 | __x._M_update_bbegin(); | |
3b2524b1 PC |
1503 | } |
1504 | ||
4797a61c FD |
1505 | template<typename _Key, typename _Value, typename _Alloc, |
1506 | typename _ExtractKey, typename _Equal, | |
1507 | typename _Hash, typename _RangeHash, typename _Unused, | |
1508 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1509 | auto |
4dad8b49 | 1510 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1511 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1512 | find(const key_type& __k) |
db97b3b0 | 1513 | -> iterator |
3b2524b1 | 1514 | { |
4dad8b49 | 1515 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 1516 | std::size_t __bkt = _M_bucket_index(__code); |
f9d98fa7 | 1517 | return iterator(_M_find_node(__bkt, __k, __code)); |
3b2524b1 PC |
1518 | } |
1519 | ||
4797a61c FD |
1520 | template<typename _Key, typename _Value, typename _Alloc, |
1521 | typename _ExtractKey, typename _Equal, | |
1522 | typename _Hash, typename _RangeHash, typename _Unused, | |
1523 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1524 | auto |
4dad8b49 | 1525 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1526 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1527 | find(const key_type& __k) const |
db97b3b0 | 1528 | -> const_iterator |
3b2524b1 | 1529 | { |
4dad8b49 | 1530 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 1531 | std::size_t __bkt = _M_bucket_index(__code); |
f9d98fa7 | 1532 | return const_iterator(_M_find_node(__bkt, __k, __code)); |
3b2524b1 PC |
1533 | } |
1534 | ||
4797a61c FD |
1535 | template<typename _Key, typename _Value, typename _Alloc, |
1536 | typename _ExtractKey, typename _Equal, | |
1537 | typename _Hash, typename _RangeHash, typename _Unused, | |
1538 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1539 | auto |
4dad8b49 | 1540 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1541 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1542 | count(const key_type& __k) const |
db97b3b0 | 1543 | -> size_type |
3b2524b1 | 1544 | { |
f9d98fa7 FD |
1545 | auto __it = find(__k); |
1546 | if (!__it._M_cur) | |
da29608a FD |
1547 | return 0; |
1548 | ||
f9d98fa7 FD |
1549 | if (__unique_keys::value) |
1550 | return 1; | |
1551 | ||
1552 | // All equivalent values are next to each other, if we find a | |
1553 | // non-equivalent value after an equivalent one it means that we won't | |
1554 | // find any new equivalent value. | |
1555 | size_type __result = 1; | |
1556 | for (auto __ref = __it++; | |
1b6f0476 | 1557 | __it._M_cur && this->_M_node_equals(*__ref._M_cur, *__it._M_cur); |
f9d98fa7 FD |
1558 | ++__it) |
1559 | ++__result; | |
1560 | ||
3b2524b1 PC |
1561 | return __result; |
1562 | } | |
1563 | ||
4797a61c FD |
1564 | template<typename _Key, typename _Value, typename _Alloc, |
1565 | typename _ExtractKey, typename _Equal, | |
1566 | typename _Hash, typename _RangeHash, typename _Unused, | |
1567 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1568 | auto |
4dad8b49 | 1569 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1570 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1571 | equal_range(const key_type& __k) |
db97b3b0 | 1572 | -> pair<iterator, iterator> |
3b2524b1 | 1573 | { |
f9d98fa7 FD |
1574 | auto __ite = find(__k); |
1575 | if (!__ite._M_cur) | |
1576 | return { __ite, __ite }; | |
7c3e9502 | 1577 | |
f9d98fa7 FD |
1578 | auto __beg = __ite++; |
1579 | if (__unique_keys::value) | |
1580 | return { __beg, __ite }; | |
3b2524b1 | 1581 | |
f9d98fa7 FD |
1582 | // All equivalent values are next to each other, if we find a |
1583 | // non-equivalent value after an equivalent one it means that we won't | |
1584 | // find any new equivalent value. | |
1b6f0476 | 1585 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
f9d98fa7 FD |
1586 | ++__ite; |
1587 | ||
1588 | return { __beg, __ite }; | |
3b2524b1 PC |
1589 | } |
1590 | ||
4797a61c FD |
1591 | template<typename _Key, typename _Value, typename _Alloc, |
1592 | typename _ExtractKey, typename _Equal, | |
1593 | typename _Hash, typename _RangeHash, typename _Unused, | |
1594 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1595 | auto |
4dad8b49 | 1596 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1597 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1598 | equal_range(const key_type& __k) const |
db97b3b0 | 1599 | -> pair<const_iterator, const_iterator> |
3b2524b1 | 1600 | { |
f9d98fa7 FD |
1601 | auto __ite = find(__k); |
1602 | if (!__ite._M_cur) | |
1603 | return { __ite, __ite }; | |
3b2524b1 | 1604 | |
f9d98fa7 FD |
1605 | auto __beg = __ite++; |
1606 | if (__unique_keys::value) | |
1607 | return { __beg, __ite }; | |
3b2524b1 | 1608 | |
f9d98fa7 FD |
1609 | // All equivalent values are next to each other, if we find a |
1610 | // non-equivalent value after an equivalent one it means that we won't | |
1611 | // find any new equivalent value. | |
1b6f0476 | 1612 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
f9d98fa7 FD |
1613 | ++__ite; |
1614 | ||
1615 | return { __beg, __ite }; | |
3b2524b1 PC |
1616 | } |
1617 | ||
f9d98fa7 FD |
1618 | // Find the node before the one whose key compares equal to k in the bucket |
1619 | // bkt. Return nullptr if no node is found. | |
4797a61c FD |
1620 | template<typename _Key, typename _Value, typename _Alloc, |
1621 | typename _ExtractKey, typename _Equal, | |
1622 | typename _Hash, typename _RangeHash, typename _Unused, | |
1623 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1624 | auto |
4dad8b49 | 1625 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1626 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 1627 | _M_find_before_node(size_type __bkt, const key_type& __k, |
4dad8b49 | 1628 | __hash_code __code) const |
1b6f0476 | 1629 | -> __node_base_ptr |
3b2524b1 | 1630 | { |
1b6f0476 | 1631 | __node_base_ptr __prev_p = _M_buckets[__bkt]; |
f86b266c | 1632 | if (!__prev_p) |
da29608a | 1633 | return nullptr; |
b3abc9d8 | 1634 | |
1b6f0476 | 1635 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt);; |
b3abc9d8 | 1636 | __p = __p->_M_next()) |
da29608a | 1637 | { |
1b6f0476 | 1638 | if (this->_M_equals(__k, __code, *__p)) |
f86b266c | 1639 | return __prev_p; |
b3abc9d8 | 1640 | |
1b6f0476 | 1641 | if (!__p->_M_nxt || _M_bucket_index(*__p->_M_next()) != __bkt) |
da29608a | 1642 | break; |
f86b266c | 1643 | __prev_p = __p; |
da29608a | 1644 | } |
f9d98fa7 | 1645 | |
919f402c | 1646 | return nullptr; |
3b2524b1 PC |
1647 | } |
1648 | ||
4797a61c FD |
1649 | template<typename _Key, typename _Value, typename _Alloc, |
1650 | typename _ExtractKey, typename _Equal, | |
1651 | typename _Hash, typename _RangeHash, typename _Unused, | |
1652 | typename _RehashPolicy, typename _Traits> | |
da29608a | 1653 | void |
4dad8b49 | 1654 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1655 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1b6f0476 | 1656 | _M_insert_bucket_begin(size_type __bkt, __node_ptr __node) |
da29608a | 1657 | { |
f86b266c | 1658 | if (_M_buckets[__bkt]) |
da29608a | 1659 | { |
4dad8b49 BK |
1660 | // Bucket is not empty, we just need to insert the new node |
1661 | // after the bucket before begin. | |
1662 | __node->_M_nxt = _M_buckets[__bkt]->_M_nxt; | |
1663 | _M_buckets[__bkt]->_M_nxt = __node; | |
da29608a FD |
1664 | } |
1665 | else | |
1666 | { | |
4dad8b49 | 1667 | // The bucket is empty, the new node is inserted at the |
207585a6 | 1668 | // beginning of the singly-linked list and the bucket will |
4dad8b49 | 1669 | // contain _M_before_begin pointer. |
b09bcf83 FD |
1670 | __node->_M_nxt = _M_before_begin._M_nxt; |
1671 | _M_before_begin._M_nxt = __node; | |
f9d98fa7 | 1672 | |
4dad8b49 | 1673 | if (__node->_M_nxt) |
f86b266c FD |
1674 | // We must update former begin bucket that is pointing to |
1675 | // _M_before_begin. | |
1b6f0476 | 1676 | _M_buckets[_M_bucket_index(*__node->_M_next())] = __node; |
f9d98fa7 | 1677 | |
b09bcf83 | 1678 | _M_buckets[__bkt] = &_M_before_begin; |
da29608a | 1679 | } |
da29608a FD |
1680 | } |
1681 | ||
4797a61c FD |
1682 | template<typename _Key, typename _Value, typename _Alloc, |
1683 | typename _ExtractKey, typename _Equal, | |
1684 | typename _Hash, typename _RangeHash, typename _Unused, | |
1685 | typename _RehashPolicy, typename _Traits> | |
da29608a | 1686 | void |
4dad8b49 | 1687 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1688 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1b6f0476 | 1689 | _M_remove_bucket_begin(size_type __bkt, __node_ptr __next, |
4dad8b49 | 1690 | size_type __next_bkt) |
da29608a FD |
1691 | { |
1692 | if (!__next || __next_bkt != __bkt) | |
1693 | { | |
1694 | // Bucket is now empty | |
f86b266c FD |
1695 | // First update next bucket if any |
1696 | if (__next) | |
da29608a | 1697 | _M_buckets[__next_bkt] = _M_buckets[__bkt]; |
4dad8b49 | 1698 | |
f86b266c | 1699 | // Second update before begin node if necessary |
b09bcf83 FD |
1700 | if (&_M_before_begin == _M_buckets[__bkt]) |
1701 | _M_before_begin._M_nxt = __next; | |
da29608a | 1702 | _M_buckets[__bkt] = nullptr; |
da29608a | 1703 | } |
da29608a FD |
1704 | } |
1705 | ||
4797a61c FD |
1706 | template<typename _Key, typename _Value, typename _Alloc, |
1707 | typename _ExtractKey, typename _Equal, | |
1708 | typename _Hash, typename _RangeHash, typename _Unused, | |
1709 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1710 | auto |
4dad8b49 | 1711 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1712 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1b6f0476 FD |
1713 | _M_get_previous_node(size_type __bkt, __node_ptr __n) |
1714 | -> __node_base_ptr | |
da29608a | 1715 | { |
1b6f0476 | 1716 | __node_base_ptr __prev_n = _M_buckets[__bkt]; |
f86b266c FD |
1717 | while (__prev_n->_M_nxt != __n) |
1718 | __prev_n = __prev_n->_M_nxt; | |
da29608a FD |
1719 | return __prev_n; |
1720 | } | |
1721 | ||
4797a61c FD |
1722 | template<typename _Key, typename _Value, typename _Alloc, |
1723 | typename _ExtractKey, typename _Equal, | |
1724 | typename _Hash, typename _RangeHash, typename _Unused, | |
1725 | typename _RehashPolicy, typename _Traits> | |
9f285ccb | 1726 | template<typename... _Args> |
db97b3b0 | 1727 | auto |
4dad8b49 | 1728 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
1729 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1730 | _M_emplace(true_type /* __uks */, _Args&&... __args) | |
9f285ccb | 1731 | -> pair<iterator, bool> |
9b81593b FD |
1732 | { |
1733 | // First build the node to get access to the hash code | |
b0c849fa | 1734 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
4797a61c | 1735 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
b0c849fa | 1736 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 1737 | size_type __bkt = _M_bucket_index(__code); |
1b6f0476 | 1738 | if (__node_ptr __p = _M_find_node(__bkt, __k, __code)) |
b0c849fa FD |
1739 | // There is already an equivalent node, no insertion |
1740 | return std::make_pair(iterator(__p), false); | |
181a5a13 FD |
1741 | |
1742 | // Insert the node | |
4797a61c | 1743 | auto __pos = _M_insert_unique_node(__bkt, __code, __node._M_node); |
b0c849fa FD |
1744 | __node._M_node = nullptr; |
1745 | return { __pos, true }; | |
9b81593b FD |
1746 | } |
1747 | ||
4797a61c FD |
1748 | template<typename _Key, typename _Value, typename _Alloc, |
1749 | typename _ExtractKey, typename _Equal, | |
1750 | typename _Hash, typename _RangeHash, typename _Unused, | |
1751 | typename _RehashPolicy, typename _Traits> | |
9b81593b | 1752 | template<typename... _Args> |
db97b3b0 | 1753 | auto |
4dad8b49 | 1754 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
1755 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1756 | _M_emplace(const_iterator __hint, false_type /* __uks */, | |
1757 | _Args&&... __args) | |
db97b3b0 | 1758 | -> iterator |
9b81593b | 1759 | { |
f86b266c | 1760 | // First build the node to get its hash code. |
b0c849fa | 1761 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
4797a61c | 1762 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
181a5a13 | 1763 | |
b0c849fa FD |
1764 | __hash_code __code = this->_M_hash_code(__k); |
1765 | auto __pos | |
4797a61c | 1766 | = _M_insert_multi_node(__hint._M_cur, __code, __node._M_node); |
b0c849fa FD |
1767 | __node._M_node = nullptr; |
1768 | return __pos; | |
9b81593b FD |
1769 | } |
1770 | ||
4797a61c FD |
1771 | template<typename _Key, typename _Value, typename _Alloc, |
1772 | typename _ExtractKey, typename _Equal, | |
1773 | typename _Hash, typename _RangeHash, typename _Unused, | |
1774 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1775 | auto |
181a5a13 | 1776 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
1777 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1778 | _M_insert_unique_node(size_type __bkt, __hash_code __code, | |
1b6f0476 | 1779 | __node_ptr __node, size_type __n_elt) |
db97b3b0 | 1780 | -> iterator |
181a5a13 FD |
1781 | { |
1782 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); | |
1783 | std::pair<bool, std::size_t> __do_rehash | |
0f146257 FD |
1784 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, |
1785 | __n_elt); | |
3b2524b1 | 1786 | |
b0c849fa | 1787 | if (__do_rehash.first) |
181a5a13 | 1788 | { |
b0c849fa | 1789 | _M_rehash(__do_rehash.second, __saved_state); |
4797a61c | 1790 | __bkt = _M_bucket_index(__code); |
b0c849fa | 1791 | } |
3b2524b1 | 1792 | |
1b6f0476 | 1793 | this->_M_store_code(*__node, __code); |
181a5a13 | 1794 | |
b0c849fa FD |
1795 | // Always insert at the beginning of the bucket. |
1796 | _M_insert_bucket_begin(__bkt, __node); | |
1797 | ++_M_element_count; | |
1798 | return iterator(__node); | |
181a5a13 FD |
1799 | } |
1800 | ||
4797a61c FD |
1801 | template<typename _Key, typename _Value, typename _Alloc, |
1802 | typename _ExtractKey, typename _Equal, | |
1803 | typename _Hash, typename _RangeHash, typename _Unused, | |
1804 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1805 | auto |
181a5a13 | 1806 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1807 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1b6f0476 FD |
1808 | _M_insert_multi_node(__node_ptr __hint, |
1809 | __hash_code __code, __node_ptr __node) | |
db97b3b0 | 1810 | -> iterator |
181a5a13 FD |
1811 | { |
1812 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); | |
1813 | std::pair<bool, std::size_t> __do_rehash | |
1814 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, 1); | |
1815 | ||
b0c849fa FD |
1816 | if (__do_rehash.first) |
1817 | _M_rehash(__do_rehash.second, __saved_state); | |
1818 | ||
1b6f0476 | 1819 | this->_M_store_code(*__node, __code); |
4797a61c FD |
1820 | const key_type& __k = _ExtractKey{}(__node->_M_v()); |
1821 | size_type __bkt = _M_bucket_index(__code); | |
b0c849fa FD |
1822 | |
1823 | // Find the node before an equivalent one or use hint if it exists and | |
1824 | // if it is equivalent. | |
1b6f0476 | 1825 | __node_base_ptr __prev |
b0c849fa | 1826 | = __builtin_expect(__hint != nullptr, false) |
1b6f0476 | 1827 | && this->_M_equals(__k, __code, *__hint) |
b0c849fa FD |
1828 | ? __hint |
1829 | : _M_find_before_node(__bkt, __k, __code); | |
1b6f0476 | 1830 | |
b0c849fa | 1831 | if (__prev) |
181a5a13 | 1832 | { |
b0c849fa FD |
1833 | // Insert after the node before the equivalent one. |
1834 | __node->_M_nxt = __prev->_M_nxt; | |
1835 | __prev->_M_nxt = __node; | |
1836 | if (__builtin_expect(__prev == __hint, false)) | |
1837 | // hint might be the last bucket node, in this case we need to | |
1838 | // update next bucket. | |
1839 | if (__node->_M_nxt | |
1b6f0476 | 1840 | && !this->_M_equals(__k, __code, *__node->_M_next())) |
b0c849fa | 1841 | { |
1b6f0476 | 1842 | size_type __next_bkt = _M_bucket_index(*__node->_M_next()); |
b0c849fa FD |
1843 | if (__next_bkt != __bkt) |
1844 | _M_buckets[__next_bkt] = __node; | |
1845 | } | |
181a5a13 | 1846 | } |
b0c849fa FD |
1847 | else |
1848 | // The inserted node has no equivalent in the hashtable. We must | |
1849 | // insert the new node at the beginning of the bucket to preserve | |
1850 | // equivalent elements' relative positions. | |
1851 | _M_insert_bucket_begin(__bkt, __node); | |
1852 | ++_M_element_count; | |
1853 | return iterator(__node); | |
181a5a13 | 1854 | } |
3b2524b1 PC |
1855 | |
1856 | // Insert v if no element with its key is already present. | |
4797a61c FD |
1857 | template<typename _Key, typename _Value, typename _Alloc, |
1858 | typename _ExtractKey, typename _Equal, | |
1859 | typename _Hash, typename _RangeHash, typename _Unused, | |
1860 | typename _RehashPolicy, typename _Traits> | |
b3abc9d8 | 1861 | template<typename _Arg, typename _NodeGenerator> |
db97b3b0 | 1862 | auto |
4dad8b49 | 1863 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1864 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
6dcf0423 FD |
1865 | _M_insert(_Arg&& __v, const _NodeGenerator& __node_gen, |
1866 | true_type /* __uks */) | |
db97b3b0 | 1867 | -> pair<iterator, bool> |
fb7342fd | 1868 | { |
4797a61c | 1869 | const key_type& __k = _ExtractKey{}(__v); |
4dad8b49 | 1870 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 1871 | size_type __bkt = _M_bucket_index(__code); |
181a5a13 | 1872 | |
1b6f0476 | 1873 | if (__node_ptr __node = _M_find_node(__bkt, __k, __code)) |
b0c849fa | 1874 | return { iterator(__node), false }; |
fb7342fd | 1875 | |
b0c849fa FD |
1876 | _Scoped_node __node{ __node_gen(std::forward<_Arg>(__v)), this }; |
1877 | auto __pos | |
4797a61c | 1878 | = _M_insert_unique_node(__bkt, __code, __node._M_node); |
b0c849fa FD |
1879 | __node._M_node = nullptr; |
1880 | return { __pos, true }; | |
fb7342fd | 1881 | } |
3b2524b1 PC |
1882 | |
1883 | // Insert v unconditionally. | |
4797a61c FD |
1884 | template<typename _Key, typename _Value, typename _Alloc, |
1885 | typename _ExtractKey, typename _Equal, | |
1886 | typename _Hash, typename _RangeHash, typename _Unused, | |
1887 | typename _RehashPolicy, typename _Traits> | |
b3abc9d8 | 1888 | template<typename _Arg, typename _NodeGenerator> |
db97b3b0 | 1889 | auto |
4dad8b49 | 1890 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1891 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
b3abc9d8 | 1892 | _M_insert(const_iterator __hint, _Arg&& __v, |
6dcf0423 FD |
1893 | const _NodeGenerator& __node_gen, |
1894 | false_type /* __uks */) | |
db97b3b0 | 1895 | -> iterator |
fb7342fd | 1896 | { |
181a5a13 FD |
1897 | // First compute the hash code so that we don't do anything if it |
1898 | // throws. | |
4797a61c | 1899 | __hash_code __code = this->_M_hash_code(_ExtractKey{}(__v)); |
3b2524b1 | 1900 | |
181a5a13 | 1901 | // Second allocate new node so that we don't rehash if it throws. |
b0c849fa | 1902 | _Scoped_node __node{ __node_gen(std::forward<_Arg>(__v)), this }; |
b0c849fa | 1903 | auto __pos |
4797a61c | 1904 | = _M_insert_multi_node(__hint._M_cur, __code, __node._M_node); |
b0c849fa FD |
1905 | __node._M_node = nullptr; |
1906 | return __pos; | |
181a5a13 | 1907 | } |
3b2524b1 | 1908 | |
4797a61c FD |
1909 | template<typename _Key, typename _Value, typename _Alloc, |
1910 | typename _ExtractKey, typename _Equal, | |
1911 | typename _Hash, typename _RangeHash, typename _Unused, | |
1912 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1913 | auto |
4dad8b49 | 1914 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1915 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 1916 | erase(const_iterator __it) |
db97b3b0 | 1917 | -> iterator |
3b2524b1 | 1918 | { |
1b6f0476 FD |
1919 | __node_ptr __n = __it._M_cur; |
1920 | std::size_t __bkt = _M_bucket_index(*__n); | |
da29608a | 1921 | |
4dad8b49 BK |
1922 | // Look for previous node to unlink it from the erased one, this |
1923 | // is why we need buckets to contain the before begin to make | |
207585a6 | 1924 | // this search fast. |
1b6f0476 | 1925 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
31578792 FD |
1926 | return _M_erase(__bkt, __prev_n, __n); |
1927 | } | |
1928 | ||
4797a61c FD |
1929 | template<typename _Key, typename _Value, typename _Alloc, |
1930 | typename _ExtractKey, typename _Equal, | |
1931 | typename _Hash, typename _RangeHash, typename _Unused, | |
1932 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1933 | auto |
31578792 | 1934 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 1935 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1b6f0476 | 1936 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n) |
db97b3b0 | 1937 | -> iterator |
31578792 FD |
1938 | { |
1939 | if (__prev_n == _M_buckets[__bkt]) | |
f86b266c | 1940 | _M_remove_bucket_begin(__bkt, __n->_M_next(), |
1b6f0476 | 1941 | __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
f86b266c | 1942 | else if (__n->_M_nxt) |
18dbb859 | 1943 | { |
1b6f0476 | 1944 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
da29608a FD |
1945 | if (__next_bkt != __bkt) |
1946 | _M_buckets[__next_bkt] = __prev_n; | |
18dbb859 PC |
1947 | } |
1948 | ||
f86b266c FD |
1949 | __prev_n->_M_nxt = __n->_M_nxt; |
1950 | iterator __result(__n->_M_next()); | |
b09bcf83 | 1951 | this->_M_deallocate_node(__n); |
18dbb859 PC |
1952 | --_M_element_count; |
1953 | ||
d723ced2 | 1954 | return __result; |
3b2524b1 PC |
1955 | } |
1956 | ||
4797a61c FD |
1957 | template<typename _Key, typename _Value, typename _Alloc, |
1958 | typename _ExtractKey, typename _Equal, | |
1959 | typename _Hash, typename _RangeHash, typename _Unused, | |
1960 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1961 | auto |
4dad8b49 | 1962 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
1963 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1964 | _M_erase(true_type /* __uks */, const key_type& __k) | |
db97b3b0 | 1965 | -> size_type |
31578792 FD |
1966 | { |
1967 | __hash_code __code = this->_M_hash_code(__k); | |
4797a61c | 1968 | std::size_t __bkt = _M_bucket_index(__code); |
31578792 FD |
1969 | |
1970 | // Look for the node before the first matching node. | |
1b6f0476 | 1971 | __node_base_ptr __prev_n = _M_find_before_node(__bkt, __k, __code); |
31578792 FD |
1972 | if (!__prev_n) |
1973 | return 0; | |
1974 | ||
1975 | // We found a matching node, erase it. | |
1b6f0476 | 1976 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
31578792 FD |
1977 | _M_erase(__bkt, __prev_n, __n); |
1978 | return 1; | |
1979 | } | |
1980 | ||
4797a61c FD |
1981 | template<typename _Key, typename _Value, typename _Alloc, |
1982 | typename _ExtractKey, typename _Equal, | |
1983 | typename _Hash, typename _RangeHash, typename _Unused, | |
1984 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 1985 | auto |
31578792 | 1986 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
1987 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
1988 | _M_erase(false_type /* __uks */, const key_type& __k) | |
db97b3b0 | 1989 | -> size_type |
3b2524b1 | 1990 | { |
4dad8b49 | 1991 | __hash_code __code = this->_M_hash_code(__k); |
4797a61c | 1992 | std::size_t __bkt = _M_bucket_index(__code); |
4dad8b49 | 1993 | |
f86b266c | 1994 | // Look for the node before the first matching node. |
1b6f0476 | 1995 | __node_base_ptr __prev_n = _M_find_before_node(__bkt, __k, __code); |
f86b266c | 1996 | if (!__prev_n) |
da29608a | 1997 | return 0; |
31578792 FD |
1998 | |
1999 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
2000 | // 526. Is it undefined if a function in the standard changes | |
2001 | // in parameters? | |
2002 | // We use one loop to find all matching nodes and another to deallocate | |
2003 | // them so that the key stays valid during the first loop. It might be | |
2004 | // invalidated indirectly when destroying nodes. | |
1b6f0476 FD |
2005 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
2006 | __node_ptr __n_last = __n->_M_next(); | |
2007 | while (__n_last && this->_M_node_equals(*__n, *__n_last)) | |
f9d98fa7 FD |
2008 | __n_last = __n_last->_M_next(); |
2009 | ||
1b6f0476 | 2010 | std::size_t __n_last_bkt = __n_last ? _M_bucket_index(*__n_last) : __bkt; |
3b2524b1 | 2011 | |
31578792 | 2012 | // Deallocate nodes. |
da29608a | 2013 | size_type __result = 0; |
da29608a | 2014 | do |
3b2524b1 | 2015 | { |
1b6f0476 | 2016 | __node_ptr __p = __n->_M_next(); |
b09bcf83 | 2017 | this->_M_deallocate_node(__n); |
31578792 | 2018 | __n = __p; |
3b2524b1 PC |
2019 | ++__result; |
2020 | } | |
31578792 FD |
2021 | while (__n != __n_last); |
2022 | ||
f9d98fa7 | 2023 | _M_element_count -= __result; |
31578792 FD |
2024 | if (__prev_n == _M_buckets[__bkt]) |
2025 | _M_remove_bucket_begin(__bkt, __n_last, __n_last_bkt); | |
f9d98fa7 | 2026 | else if (__n_last_bkt != __bkt) |
31578792 FD |
2027 | _M_buckets[__n_last_bkt] = __prev_n; |
2028 | __prev_n->_M_nxt = __n_last; | |
3b2524b1 PC |
2029 | return __result; |
2030 | } | |
2031 | ||
4797a61c FD |
2032 | template<typename _Key, typename _Value, typename _Alloc, |
2033 | typename _ExtractKey, typename _Equal, | |
2034 | typename _Hash, typename _RangeHash, typename _Unused, | |
2035 | typename _RehashPolicy, typename _Traits> | |
db97b3b0 | 2036 | auto |
4dad8b49 | 2037 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 2038 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
3b2524b1 | 2039 | erase(const_iterator __first, const_iterator __last) |
db97b3b0 | 2040 | -> iterator |
3b2524b1 | 2041 | { |
1b6f0476 FD |
2042 | __node_ptr __n = __first._M_cur; |
2043 | __node_ptr __last_n = __last._M_cur; | |
da29608a FD |
2044 | if (__n == __last_n) |
2045 | return iterator(__n); | |
2046 | ||
1b6f0476 | 2047 | std::size_t __bkt = _M_bucket_index(*__n); |
da29608a | 2048 | |
1b6f0476 | 2049 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
da29608a FD |
2050 | bool __is_bucket_begin = __n == _M_bucket_begin(__bkt); |
2051 | std::size_t __n_bkt = __bkt; | |
2052 | for (;;) | |
2053 | { | |
2054 | do | |
2055 | { | |
1b6f0476 | 2056 | __node_ptr __tmp = __n; |
f86b266c | 2057 | __n = __n->_M_next(); |
b09bcf83 | 2058 | this->_M_deallocate_node(__tmp); |
da29608a FD |
2059 | --_M_element_count; |
2060 | if (!__n) | |
2061 | break; | |
1b6f0476 | 2062 | __n_bkt = _M_bucket_index(*__n); |
da29608a FD |
2063 | } |
2064 | while (__n != __last_n && __n_bkt == __bkt); | |
2065 | if (__is_bucket_begin) | |
2066 | _M_remove_bucket_begin(__bkt, __n, __n_bkt); | |
2067 | if (__n == __last_n) | |
2068 | break; | |
2069 | __is_bucket_begin = true; | |
2070 | __bkt = __n_bkt; | |
2071 | } | |
2072 | ||
ac1384b7 | 2073 | if (__n && (__n_bkt != __bkt || __is_bucket_begin)) |
da29608a | 2074 | _M_buckets[__n_bkt] = __prev_n; |
f86b266c | 2075 | __prev_n->_M_nxt = __n; |
da29608a | 2076 | return iterator(__n); |
d723ced2 | 2077 | } |
3b2524b1 | 2078 | |
4797a61c FD |
2079 | template<typename _Key, typename _Value, typename _Alloc, |
2080 | typename _ExtractKey, typename _Equal, | |
2081 | typename _Hash, typename _RangeHash, typename _Unused, | |
2082 | typename _RehashPolicy, typename _Traits> | |
3b2524b1 | 2083 | void |
4dad8b49 | 2084 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 2085 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
d3677132 | 2086 | clear() noexcept |
3b2524b1 | 2087 | { |
b09bcf83 | 2088 | this->_M_deallocate_nodes(_M_begin()); |
1b6f0476 FD |
2089 | __builtin_memset(_M_buckets, 0, |
2090 | _M_bucket_count * sizeof(__node_base_ptr)); | |
3b2524b1 | 2091 | _M_element_count = 0; |
b09bcf83 | 2092 | _M_before_begin._M_nxt = nullptr; |
3b2524b1 | 2093 | } |
7c3e9502 | 2094 | |
4797a61c FD |
2095 | template<typename _Key, typename _Value, typename _Alloc, |
2096 | typename _ExtractKey, typename _Equal, | |
2097 | typename _Hash, typename _RangeHash, typename _Unused, | |
2098 | typename _RehashPolicy, typename _Traits> | |
3b2524b1 | 2099 | void |
4dad8b49 | 2100 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 2101 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 2102 | rehash(size_type __bkt_count) |
3b2524b1 | 2103 | { |
4dad8b49 | 2104 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); |
7cfe71d1 | 2105 | __bkt_count |
d4a7f7a1 | 2106 | = std::max(_M_rehash_policy._M_bkt_for_elements(_M_element_count + 1), |
7cfe71d1 FD |
2107 | __bkt_count); |
2108 | __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count); | |
2514d7f1 | 2109 | |
7cfe71d1 FD |
2110 | if (__bkt_count != _M_bucket_count) |
2111 | _M_rehash(__bkt_count, __saved_state); | |
ecf07a67 | 2112 | else |
de6f5f57 FD |
2113 | // No rehash, restore previous state to keep it consistent with |
2114 | // container state. | |
ecf07a67 | 2115 | _M_rehash_policy._M_reset(__saved_state); |
3b2524b1 PC |
2116 | } |
2117 | ||
4797a61c FD |
2118 | template<typename _Key, typename _Value, typename _Alloc, |
2119 | typename _ExtractKey, typename _Equal, | |
2120 | typename _Hash, typename _RangeHash, typename _Unused, | |
2121 | typename _RehashPolicy, typename _Traits> | |
3b2524b1 | 2122 | void |
4dad8b49 | 2123 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c | 2124 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
7cfe71d1 | 2125 | _M_rehash(size_type __bkt_count, const __rehash_state& __state) |
3b2524b1 | 2126 | { |
3b2524b1 PC |
2127 | __try |
2128 | { | |
4797a61c | 2129 | _M_rehash_aux(__bkt_count, __unique_keys{}); |
ac0ab963 FD |
2130 | } |
2131 | __catch(...) | |
2132 | { | |
2133 | // A failure here means that buckets allocation failed. We only | |
2134 | // have to restore hash policy previous state. | |
2135 | _M_rehash_policy._M_reset(__state); | |
2136 | __throw_exception_again; | |
2137 | } | |
2138 | } | |
2139 | ||
2140 | // Rehash when there is no equivalent elements. | |
4797a61c FD |
2141 | template<typename _Key, typename _Value, typename _Alloc, |
2142 | typename _ExtractKey, typename _Equal, | |
2143 | typename _Hash, typename _RangeHash, typename _Unused, | |
2144 | typename _RehashPolicy, typename _Traits> | |
ac0ab963 | 2145 | void |
4dad8b49 | 2146 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
2147 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
2148 | _M_rehash_aux(size_type __bkt_count, true_type /* __uks */) | |
ac0ab963 | 2149 | { |
1b6f0476 FD |
2150 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
2151 | __node_ptr __p = _M_begin(); | |
b09bcf83 | 2152 | _M_before_begin._M_nxt = nullptr; |
25caa91e | 2153 | std::size_t __bbegin_bkt = 0; |
ac0ab963 FD |
2154 | while (__p) |
2155 | { | |
1b6f0476 | 2156 | __node_ptr __next = __p->_M_next(); |
7cfe71d1 | 2157 | std::size_t __bkt |
1b6f0476 | 2158 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
ac0ab963 | 2159 | if (!__new_buckets[__bkt]) |
da29608a | 2160 | { |
b09bcf83 FD |
2161 | __p->_M_nxt = _M_before_begin._M_nxt; |
2162 | _M_before_begin._M_nxt = __p; | |
2163 | __new_buckets[__bkt] = &_M_before_begin; | |
ac0ab963 FD |
2164 | if (__p->_M_nxt) |
2165 | __new_buckets[__bbegin_bkt] = __p; | |
2166 | __bbegin_bkt = __bkt; | |
2167 | } | |
2168 | else | |
2169 | { | |
2170 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; | |
2171 | __new_buckets[__bkt]->_M_nxt = __p; | |
2172 | } | |
f9d98fa7 | 2173 | |
ac0ab963 FD |
2174 | __p = __next; |
2175 | } | |
0462b6aa | 2176 | |
95539f21 | 2177 | _M_deallocate_buckets(); |
7cfe71d1 | 2178 | _M_bucket_count = __bkt_count; |
ac0ab963 FD |
2179 | _M_buckets = __new_buckets; |
2180 | } | |
2181 | ||
2182 | // Rehash when there can be equivalent elements, preserve their relative | |
2183 | // order. | |
4797a61c FD |
2184 | template<typename _Key, typename _Value, typename _Alloc, |
2185 | typename _ExtractKey, typename _Equal, | |
2186 | typename _Hash, typename _RangeHash, typename _Unused, | |
2187 | typename _RehashPolicy, typename _Traits> | |
ac0ab963 | 2188 | void |
4dad8b49 | 2189 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
4797a61c FD |
2190 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
2191 | _M_rehash_aux(size_type __bkt_count, false_type /* __uks */) | |
ac0ab963 | 2192 | { |
1b6f0476 FD |
2193 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
2194 | __node_ptr __p = _M_begin(); | |
b09bcf83 | 2195 | _M_before_begin._M_nxt = nullptr; |
25caa91e PC |
2196 | std::size_t __bbegin_bkt = 0; |
2197 | std::size_t __prev_bkt = 0; | |
1b6f0476 | 2198 | __node_ptr __prev_p = nullptr; |
ac0ab963 FD |
2199 | bool __check_bucket = false; |
2200 | ||
2201 | while (__p) | |
2202 | { | |
1b6f0476 | 2203 | __node_ptr __next = __p->_M_next(); |
7cfe71d1 | 2204 | std::size_t __bkt |
1b6f0476 | 2205 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
ac0ab963 | 2206 | |
b7a9facb | 2207 | if (__prev_p && __prev_bkt == __bkt) |
ac0ab963 | 2208 | { |
b7a9facb FD |
2209 | // Previous insert was already in this bucket, we insert after |
2210 | // the previously inserted one to preserve equivalent elements | |
2211 | // relative order. | |
2212 | __p->_M_nxt = __prev_p->_M_nxt; | |
2213 | __prev_p->_M_nxt = __p; | |
2214 | ||
2215 | // Inserting after a node in a bucket require to check that we | |
2216 | // haven't change the bucket last node, in this case next | |
2217 | // bucket containing its before begin node must be updated. We | |
2218 | // schedule a check as soon as we move out of the sequence of | |
2219 | // equivalent nodes to limit the number of checks. | |
2220 | __check_bucket = true; | |
ac0ab963 FD |
2221 | } |
2222 | else | |
2223 | { | |
b7a9facb | 2224 | if (__check_bucket) |
f86b266c | 2225 | { |
25caa91e PC |
2226 | // Check if we shall update the next bucket because of |
2227 | // insertions into __prev_bkt bucket. | |
b7a9facb FD |
2228 | if (__prev_p->_M_nxt) |
2229 | { | |
2230 | std::size_t __next_bkt | |
1b6f0476 FD |
2231 | = __hash_code_base::_M_bucket_index( |
2232 | *__prev_p->_M_next(), __bkt_count); | |
b7a9facb FD |
2233 | if (__next_bkt != __prev_bkt) |
2234 | __new_buckets[__next_bkt] = __prev_p; | |
2235 | } | |
2236 | __check_bucket = false; | |
2237 | } | |
2238 | ||
2239 | if (!__new_buckets[__bkt]) | |
2240 | { | |
b09bcf83 FD |
2241 | __p->_M_nxt = _M_before_begin._M_nxt; |
2242 | _M_before_begin._M_nxt = __p; | |
2243 | __new_buckets[__bkt] = &_M_before_begin; | |
b7a9facb FD |
2244 | if (__p->_M_nxt) |
2245 | __new_buckets[__bbegin_bkt] = __p; | |
2246 | __bbegin_bkt = __bkt; | |
f86b266c FD |
2247 | } |
2248 | else | |
2249 | { | |
ac0ab963 FD |
2250 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; |
2251 | __new_buckets[__bkt]->_M_nxt = __p; | |
f86b266c | 2252 | } |
da29608a | 2253 | } |
ac0ab963 FD |
2254 | __prev_p = __p; |
2255 | __prev_bkt = __bkt; | |
2256 | __p = __next; | |
3b2524b1 | 2257 | } |
ac0ab963 FD |
2258 | |
2259 | if (__check_bucket && __prev_p->_M_nxt) | |
3b2524b1 | 2260 | { |
ac0ab963 | 2261 | std::size_t __next_bkt |
1b6f0476 | 2262 | = __hash_code_base::_M_bucket_index(*__prev_p->_M_next(), |
7cfe71d1 | 2263 | __bkt_count); |
ac0ab963 FD |
2264 | if (__next_bkt != __prev_bkt) |
2265 | __new_buckets[__next_bkt] = __prev_p; | |
3b2524b1 | 2266 | } |
ac0ab963 | 2267 | |
95539f21 | 2268 | _M_deallocate_buckets(); |
7cfe71d1 | 2269 | _M_bucket_count = __bkt_count; |
ac0ab963 | 2270 | _M_buckets = __new_buckets; |
3b2524b1 | 2271 | } |
7c3e9502 | 2272 | |
2dbe56bd JW |
2273 | #if __cplusplus > 201402L |
2274 | template<typename, typename, typename> class _Hash_merge_helper { }; | |
2275 | #endif // C++17 | |
2276 | ||
08abbdda JW |
2277 | #if __cpp_deduction_guides >= 201606 |
2278 | // Used to constrain deduction guides | |
2279 | template<typename _Hash> | |
2280 | using _RequireNotAllocatorOrIntegral | |
2281 | = __enable_if_t<!__or_<is_integral<_Hash>, __is_allocator<_Hash>>::value>; | |
2282 | #endif | |
2283 | ||
12ffa228 BK |
2284 | _GLIBCXX_END_NAMESPACE_VERSION |
2285 | } // namespace std | |
3b2524b1 PC |
2286 | |
2287 | #endif // _HASHTABLE_H |