| 1 | // hashtable.h header -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2007-2021 Free Software Foundation, Inc. |
| 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 |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 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 | |
| 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/>. |
| 24 | |
| 25 | /** @file bits/hashtable.h |
| 26 | * This is an internal header file, included by other library headers. |
| 27 | * Do not attempt to use it directly. @headername{unordered_map, unordered_set} |
| 28 | */ |
| 29 | |
| 30 | #ifndef _HASHTABLE_H |
| 31 | #define _HASHTABLE_H 1 |
| 32 | |
| 33 | #pragma GCC system_header |
| 34 | |
| 35 | #include <bits/hashtable_policy.h> |
| 36 | #include <bits/enable_special_members.h> |
| 37 | #if __cplusplus > 201402L |
| 38 | # include <bits/node_handle.h> |
| 39 | #endif |
| 40 | |
| 41 | namespace std _GLIBCXX_VISIBILITY(default) |
| 42 | { |
| 43 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 44 | |
| 45 | template<typename _Tp, typename _Hash> |
| 46 | using __cache_default |
| 47 | = __not_<__and_<// Do not cache for fast hasher. |
| 48 | __is_fast_hash<_Hash>, |
| 49 | // Mandatory to have erase not throwing. |
| 50 | __is_nothrow_invocable<const _Hash&, const _Tp&>>>; |
| 51 | |
| 52 | // Helper to conditionally delete the default constructor. |
| 53 | // The _Hash_node_base type is used to distinguish this specialization |
| 54 | // from any other potentially-overlapping subobjects of the hashtable. |
| 55 | template<typename _Equal, typename _Hash, typename _Allocator> |
| 56 | using _Hashtable_enable_default_ctor |
| 57 | = _Enable_default_constructor<__and_<is_default_constructible<_Equal>, |
| 58 | is_default_constructible<_Hash>, |
| 59 | is_default_constructible<_Allocator>>{}, |
| 60 | __detail::_Hash_node_base>; |
| 61 | |
| 62 | /** |
| 63 | * Primary class template _Hashtable. |
| 64 | * |
| 65 | * @ingroup hashtable-detail |
| 66 | * |
| 67 | * @tparam _Value CopyConstructible type. |
| 68 | * |
| 69 | * @tparam _Key CopyConstructible type. |
| 70 | * |
| 71 | * @tparam _Alloc An allocator type |
| 72 | * ([lib.allocator.requirements]) whose _Alloc::value_type is |
| 73 | * _Value. As a conforming extension, we allow for |
| 74 | * _Alloc::value_type != _Value. |
| 75 | * |
| 76 | * @tparam _ExtractKey Function object that takes an object of type |
| 77 | * _Value and returns a value of type _Key. |
| 78 | * |
| 79 | * @tparam _Equal Function object that takes two objects of type k |
| 80 | * and returns a bool-like value that is true if the two objects |
| 81 | * are considered equal. |
| 82 | * |
| 83 | * @tparam _Hash The hash function. A unary function object with |
| 84 | * argument type _Key and result type size_t. Return values should |
| 85 | * be distributed over the entire range [0, numeric_limits<size_t>:::max()]. |
| 86 | * |
| 87 | * @tparam _RangeHash The range-hashing function (in the terminology of |
| 88 | * Tavori and Dreizin). A binary function object whose argument |
| 89 | * types and result type are all size_t. Given arguments r and N, |
| 90 | * the return value is in the range [0, N). |
| 91 | * |
| 92 | * @tparam _Unused Not used. |
| 93 | * |
| 94 | * @tparam _RehashPolicy Policy class with three members, all of |
| 95 | * which govern the bucket count. _M_next_bkt(n) returns a bucket |
| 96 | * count no smaller than n. _M_bkt_for_elements(n) returns a |
| 97 | * bucket count appropriate for an element count of n. |
| 98 | * _M_need_rehash(n_bkt, n_elt, n_ins) determines whether, if the |
| 99 | * current bucket count is n_bkt and the current element count is |
| 100 | * n_elt, we need to increase the bucket count for n_ins insertions. |
| 101 | * If so, returns make_pair(true, n), where n is the new bucket count. If |
| 102 | * not, returns make_pair(false, <anything>) |
| 103 | * |
| 104 | * @tparam _Traits Compile-time class with three boolean |
| 105 | * std::integral_constant members: __cache_hash_code, __constant_iterators, |
| 106 | * __unique_keys. |
| 107 | * |
| 108 | * Each _Hashtable data structure has: |
| 109 | * |
| 110 | * - _Bucket[] _M_buckets |
| 111 | * - _Hash_node_base _M_before_begin |
| 112 | * - size_type _M_bucket_count |
| 113 | * - size_type _M_element_count |
| 114 | * |
| 115 | * with _Bucket being _Hash_node_base* and _Hash_node containing: |
| 116 | * |
| 117 | * - _Hash_node* _M_next |
| 118 | * - Tp _M_value |
| 119 | * - size_t _M_hash_code if cache_hash_code is true |
| 120 | * |
| 121 | * In terms of Standard containers the hashtable is like the aggregation of: |
| 122 | * |
| 123 | * - std::forward_list<_Node> containing the elements |
| 124 | * - std::vector<std::forward_list<_Node>::iterator> representing the buckets |
| 125 | * |
| 126 | * The non-empty buckets contain the node before the first node in the |
| 127 | * bucket. This design makes it possible to implement something like a |
| 128 | * std::forward_list::insert_after on container insertion and |
| 129 | * std::forward_list::erase_after on container erase |
| 130 | * calls. _M_before_begin is equivalent to |
| 131 | * std::forward_list::before_begin. Empty buckets contain |
| 132 | * nullptr. Note that one of the non-empty buckets contains |
| 133 | * &_M_before_begin which is not a dereferenceable node so the |
| 134 | * node pointer in a bucket shall never be dereferenced, only its |
| 135 | * next node can be. |
| 136 | * |
| 137 | * Walking through a bucket's nodes requires a check on the hash code to |
| 138 | * see if each node is still in the bucket. Such a design assumes a |
| 139 | * quite efficient hash functor and is one of the reasons it is |
| 140 | * highly advisable to set __cache_hash_code to true. |
| 141 | * |
| 142 | * The container iterators are simply built from nodes. This way |
| 143 | * incrementing the iterator is perfectly efficient independent of |
| 144 | * how many empty buckets there are in the container. |
| 145 | * |
| 146 | * On insert we compute the element's hash code and use it to find the |
| 147 | * bucket index. If the element must be inserted in an empty bucket |
| 148 | * we add it at the beginning of the singly linked list and make the |
| 149 | * bucket point to _M_before_begin. The bucket that used to point to |
| 150 | * _M_before_begin, if any, is updated to point to its new before |
| 151 | * begin node. |
| 152 | * |
| 153 | * On erase, the simple iterator design requires using the hash |
| 154 | * functor to get the index of the bucket to update. For this |
| 155 | * reason, when __cache_hash_code is set to false the hash functor must |
| 156 | * not throw and this is enforced by a static assertion. |
| 157 | * |
| 158 | * Functionality is implemented by decomposition into base classes, |
| 159 | * where the derived _Hashtable class is used in _Map_base, |
| 160 | * _Insert, _Rehash_base, and _Equality base classes to access the |
| 161 | * "this" pointer. _Hashtable_base is used in the base classes as a |
| 162 | * non-recursive, fully-completed-type so that detailed nested type |
| 163 | * information, such as iterator type and node type, can be |
| 164 | * used. This is similar to the "Curiously Recurring Template |
| 165 | * Pattern" (CRTP) technique, but uses a reconstructed, not |
| 166 | * explicitly passed, template pattern. |
| 167 | * |
| 168 | * Base class templates are: |
| 169 | * - __detail::_Hashtable_base |
| 170 | * - __detail::_Map_base |
| 171 | * - __detail::_Insert |
| 172 | * - __detail::_Rehash_base |
| 173 | * - __detail::_Equality |
| 174 | */ |
| 175 | template<typename _Key, typename _Value, typename _Alloc, |
| 176 | typename _ExtractKey, typename _Equal, |
| 177 | typename _Hash, typename _RangeHash, typename _Unused, |
| 178 | typename _RehashPolicy, typename _Traits> |
| 179 | class _Hashtable |
| 180 | : public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, |
| 181 | _Hash, _RangeHash, _Unused, _Traits>, |
| 182 | public __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 183 | _Hash, _RangeHash, _Unused, |
| 184 | _RehashPolicy, _Traits>, |
| 185 | public __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 186 | _Hash, _RangeHash, _Unused, |
| 187 | _RehashPolicy, _Traits>, |
| 188 | public __detail::_Rehash_base<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 189 | _Hash, _RangeHash, _Unused, |
| 190 | _RehashPolicy, _Traits>, |
| 191 | public __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 192 | _Hash, _RangeHash, _Unused, |
| 193 | _RehashPolicy, _Traits>, |
| 194 | private __detail::_Hashtable_alloc< |
| 195 | __alloc_rebind<_Alloc, |
| 196 | __detail::_Hash_node<_Value, |
| 197 | _Traits::__hash_cached::value>>>, |
| 198 | private _Hashtable_enable_default_ctor<_Equal, _Hash, _Alloc> |
| 199 | { |
| 200 | static_assert(is_same<typename remove_cv<_Value>::type, _Value>::value, |
| 201 | "unordered container must have a non-const, non-volatile value_type"); |
| 202 | #if __cplusplus > 201703L || defined __STRICT_ANSI__ |
| 203 | static_assert(is_same<typename _Alloc::value_type, _Value>{}, |
| 204 | "unordered container must have the same value_type as its allocator"); |
| 205 | #endif |
| 206 | |
| 207 | using __traits_type = _Traits; |
| 208 | using __hash_cached = typename __traits_type::__hash_cached; |
| 209 | using __constant_iterators = typename __traits_type::__constant_iterators; |
| 210 | using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>; |
| 211 | using __node_alloc_type = __alloc_rebind<_Alloc, __node_type>; |
| 212 | |
| 213 | using __hashtable_alloc = __detail::_Hashtable_alloc<__node_alloc_type>; |
| 214 | |
| 215 | using __node_value_type = |
| 216 | __detail::_Hash_node_value<_Value, __hash_cached::value>; |
| 217 | using __node_ptr = typename __hashtable_alloc::__node_ptr; |
| 218 | using __value_alloc_traits = |
| 219 | typename __hashtable_alloc::__value_alloc_traits; |
| 220 | using __node_alloc_traits = |
| 221 | typename __hashtable_alloc::__node_alloc_traits; |
| 222 | using __node_base = typename __hashtable_alloc::__node_base; |
| 223 | using __node_base_ptr = typename __hashtable_alloc::__node_base_ptr; |
| 224 | using __buckets_ptr = typename __hashtable_alloc::__buckets_ptr; |
| 225 | |
| 226 | using __insert_base = __detail::_Insert<_Key, _Value, _Alloc, _ExtractKey, |
| 227 | _Equal, _Hash, |
| 228 | _RangeHash, _Unused, |
| 229 | _RehashPolicy, _Traits>; |
| 230 | using __enable_default_ctor |
| 231 | = _Hashtable_enable_default_ctor<_Equal, _Hash, _Alloc>; |
| 232 | |
| 233 | public: |
| 234 | typedef _Key key_type; |
| 235 | typedef _Value value_type; |
| 236 | typedef _Alloc allocator_type; |
| 237 | typedef _Equal key_equal; |
| 238 | |
| 239 | // mapped_type, if present, comes from _Map_base. |
| 240 | // hasher, if present, comes from _Hash_code_base/_Hashtable_base. |
| 241 | typedef typename __value_alloc_traits::pointer pointer; |
| 242 | typedef typename __value_alloc_traits::const_pointer const_pointer; |
| 243 | typedef value_type& reference; |
| 244 | typedef const value_type& const_reference; |
| 245 | |
| 246 | using iterator = typename __insert_base::iterator; |
| 247 | |
| 248 | using const_iterator = typename __insert_base::const_iterator; |
| 249 | |
| 250 | using local_iterator = __detail::_Local_iterator<key_type, _Value, |
| 251 | _ExtractKey, _Hash, _RangeHash, _Unused, |
| 252 | __constant_iterators::value, |
| 253 | __hash_cached::value>; |
| 254 | |
| 255 | using const_local_iterator = __detail::_Local_const_iterator< |
| 256 | key_type, _Value, |
| 257 | _ExtractKey, _Hash, _RangeHash, _Unused, |
| 258 | __constant_iterators::value, __hash_cached::value>; |
| 259 | |
| 260 | private: |
| 261 | using __rehash_type = _RehashPolicy; |
| 262 | using __rehash_state = typename __rehash_type::_State; |
| 263 | |
| 264 | using __unique_keys = typename __traits_type::__unique_keys; |
| 265 | |
| 266 | using __hashtable_base = __detail:: |
| 267 | _Hashtable_base<_Key, _Value, _ExtractKey, |
| 268 | _Equal, _Hash, _RangeHash, _Unused, _Traits>; |
| 269 | |
| 270 | using __hash_code_base = typename __hashtable_base::__hash_code_base; |
| 271 | using __hash_code = typename __hashtable_base::__hash_code; |
| 272 | using __ireturn_type = typename __insert_base::__ireturn_type; |
| 273 | |
| 274 | using __map_base = __detail::_Map_base<_Key, _Value, _Alloc, _ExtractKey, |
| 275 | _Equal, _Hash, _RangeHash, _Unused, |
| 276 | _RehashPolicy, _Traits>; |
| 277 | |
| 278 | using __rehash_base = __detail::_Rehash_base<_Key, _Value, _Alloc, |
| 279 | _ExtractKey, _Equal, |
| 280 | _Hash, _RangeHash, _Unused, |
| 281 | _RehashPolicy, _Traits>; |
| 282 | |
| 283 | using __eq_base = __detail::_Equality<_Key, _Value, _Alloc, _ExtractKey, |
| 284 | _Equal, _Hash, _RangeHash, _Unused, |
| 285 | _RehashPolicy, _Traits>; |
| 286 | |
| 287 | using __reuse_or_alloc_node_gen_t = |
| 288 | __detail::_ReuseOrAllocNode<__node_alloc_type>; |
| 289 | using __alloc_node_gen_t = |
| 290 | __detail::_AllocNode<__node_alloc_type>; |
| 291 | |
| 292 | // Simple RAII type for managing a node containing an element |
| 293 | struct _Scoped_node |
| 294 | { |
| 295 | // Take ownership of a node with a constructed element. |
| 296 | _Scoped_node(__node_ptr __n, __hashtable_alloc* __h) |
| 297 | : _M_h(__h), _M_node(__n) { } |
| 298 | |
| 299 | // Allocate a node and construct an element within it. |
| 300 | template<typename... _Args> |
| 301 | _Scoped_node(__hashtable_alloc* __h, _Args&&... __args) |
| 302 | : _M_h(__h), |
| 303 | _M_node(__h->_M_allocate_node(std::forward<_Args>(__args)...)) |
| 304 | { } |
| 305 | |
| 306 | // Destroy element and deallocate node. |
| 307 | ~_Scoped_node() { if (_M_node) _M_h->_M_deallocate_node(_M_node); }; |
| 308 | |
| 309 | _Scoped_node(const _Scoped_node&) = delete; |
| 310 | _Scoped_node& operator=(const _Scoped_node&) = delete; |
| 311 | |
| 312 | __hashtable_alloc* _M_h; |
| 313 | __node_ptr _M_node; |
| 314 | }; |
| 315 | |
| 316 | template<typename _Ht> |
| 317 | static constexpr |
| 318 | typename conditional<std::is_lvalue_reference<_Ht>::value, |
| 319 | const value_type&, value_type&&>::type |
| 320 | __fwd_value_for(value_type& __val) noexcept |
| 321 | { return std::move(__val); } |
| 322 | |
| 323 | // Compile-time diagnostics. |
| 324 | |
| 325 | // _Hash_code_base has everything protected, so use this derived type to |
| 326 | // access it. |
| 327 | struct __hash_code_base_access : __hash_code_base |
| 328 | { using __hash_code_base::_M_bucket_index; }; |
| 329 | |
| 330 | // Getting a bucket index from a node shall not throw because it is used |
| 331 | // in methods (erase, swap...) that shall not throw. |
| 332 | static_assert(noexcept(declval<const __hash_code_base_access&>() |
| 333 | ._M_bucket_index(declval<const __node_value_type&>(), |
| 334 | (std::size_t)0)), |
| 335 | "Cache the hash code or qualify your functors involved" |
| 336 | " in hash code and bucket index computation with noexcept"); |
| 337 | |
| 338 | // To get bucket index we need _RangeHash not to throw. |
| 339 | static_assert(is_nothrow_default_constructible<_RangeHash>::value, |
| 340 | "Functor used to map hash code to bucket index" |
| 341 | " must be nothrow default constructible"); |
| 342 | static_assert(noexcept( |
| 343 | std::declval<const _RangeHash&>()((std::size_t)0, (std::size_t)0)), |
| 344 | "Functor used to map hash code to bucket index must be" |
| 345 | " noexcept"); |
| 346 | |
| 347 | // To compute bucket index we also need _ExtratKey not to throw. |
| 348 | static_assert(is_nothrow_default_constructible<_ExtractKey>::value, |
| 349 | "_ExtractKey must be nothrow default constructible"); |
| 350 | static_assert(noexcept( |
| 351 | std::declval<const _ExtractKey&>()(std::declval<_Value>())), |
| 352 | "_ExtractKey functor must be noexcept invocable"); |
| 353 | |
| 354 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 355 | typename _ExtractKeya, typename _Equala, |
| 356 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 357 | typename _RehashPolicya, typename _Traitsa, |
| 358 | bool _Unique_keysa> |
| 359 | friend struct __detail::_Map_base; |
| 360 | |
| 361 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 362 | typename _ExtractKeya, typename _Equala, |
| 363 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 364 | typename _RehashPolicya, typename _Traitsa> |
| 365 | friend struct __detail::_Insert_base; |
| 366 | |
| 367 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 368 | typename _ExtractKeya, typename _Equala, |
| 369 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 370 | typename _RehashPolicya, typename _Traitsa, |
| 371 | bool _Constant_iteratorsa> |
| 372 | friend struct __detail::_Insert; |
| 373 | |
| 374 | template<typename _Keya, typename _Valuea, typename _Alloca, |
| 375 | typename _ExtractKeya, typename _Equala, |
| 376 | typename _Hasha, typename _RangeHasha, typename _Unuseda, |
| 377 | typename _RehashPolicya, typename _Traitsa, |
| 378 | bool _Unique_keysa> |
| 379 | friend struct __detail::_Equality; |
| 380 | |
| 381 | public: |
| 382 | using size_type = typename __hashtable_base::size_type; |
| 383 | using difference_type = typename __hashtable_base::difference_type; |
| 384 | |
| 385 | #if __cplusplus > 201402L |
| 386 | using node_type = _Node_handle<_Key, _Value, __node_alloc_type>; |
| 387 | using insert_return_type = _Node_insert_return<iterator, node_type>; |
| 388 | #endif |
| 389 | |
| 390 | private: |
| 391 | __buckets_ptr _M_buckets = &_M_single_bucket; |
| 392 | size_type _M_bucket_count = 1; |
| 393 | __node_base _M_before_begin; |
| 394 | size_type _M_element_count = 0; |
| 395 | _RehashPolicy _M_rehash_policy; |
| 396 | |
| 397 | // A single bucket used when only need for 1 bucket. Especially |
| 398 | // interesting in move semantic to leave hashtable with only 1 bucket |
| 399 | // which is not allocated so that we can have those operations noexcept |
| 400 | // qualified. |
| 401 | // Note that we can't leave hashtable with 0 bucket without adding |
| 402 | // numerous checks in the code to avoid 0 modulus. |
| 403 | __node_base_ptr _M_single_bucket = nullptr; |
| 404 | |
| 405 | void |
| 406 | _M_update_bbegin() |
| 407 | { |
| 408 | if (_M_begin()) |
| 409 | _M_buckets[_M_bucket_index(*_M_begin())] = &_M_before_begin; |
| 410 | } |
| 411 | |
| 412 | void |
| 413 | _M_update_bbegin(__node_ptr __n) |
| 414 | { |
| 415 | _M_before_begin._M_nxt = __n; |
| 416 | _M_update_bbegin(); |
| 417 | } |
| 418 | |
| 419 | bool |
| 420 | _M_uses_single_bucket(__buckets_ptr __bkts) const |
| 421 | { return __builtin_expect(__bkts == &_M_single_bucket, false); } |
| 422 | |
| 423 | bool |
| 424 | _M_uses_single_bucket() const |
| 425 | { return _M_uses_single_bucket(_M_buckets); } |
| 426 | |
| 427 | __hashtable_alloc& |
| 428 | _M_base_alloc() { return *this; } |
| 429 | |
| 430 | __buckets_ptr |
| 431 | _M_allocate_buckets(size_type __bkt_count) |
| 432 | { |
| 433 | if (__builtin_expect(__bkt_count == 1, false)) |
| 434 | { |
| 435 | _M_single_bucket = nullptr; |
| 436 | return &_M_single_bucket; |
| 437 | } |
| 438 | |
| 439 | return __hashtable_alloc::_M_allocate_buckets(__bkt_count); |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | _M_deallocate_buckets(__buckets_ptr __bkts, size_type __bkt_count) |
| 444 | { |
| 445 | if (_M_uses_single_bucket(__bkts)) |
| 446 | return; |
| 447 | |
| 448 | __hashtable_alloc::_M_deallocate_buckets(__bkts, __bkt_count); |
| 449 | } |
| 450 | |
| 451 | void |
| 452 | _M_deallocate_buckets() |
| 453 | { _M_deallocate_buckets(_M_buckets, _M_bucket_count); } |
| 454 | |
| 455 | // Gets bucket begin, deals with the fact that non-empty buckets contain |
| 456 | // their before begin node. |
| 457 | __node_ptr |
| 458 | _M_bucket_begin(size_type __bkt) const; |
| 459 | |
| 460 | __node_ptr |
| 461 | _M_begin() const |
| 462 | { return static_cast<__node_ptr>(_M_before_begin._M_nxt); } |
| 463 | |
| 464 | // Assign *this using another _Hashtable instance. Whether elements |
| 465 | // are copied or moved depends on the _Ht reference. |
| 466 | template<typename _Ht> |
| 467 | void |
| 468 | _M_assign_elements(_Ht&&); |
| 469 | |
| 470 | template<typename _Ht, typename _NodeGenerator> |
| 471 | void |
| 472 | _M_assign(_Ht&&, const _NodeGenerator&); |
| 473 | |
| 474 | void |
| 475 | _M_move_assign(_Hashtable&&, true_type); |
| 476 | |
| 477 | void |
| 478 | _M_move_assign(_Hashtable&&, false_type); |
| 479 | |
| 480 | void |
| 481 | _M_reset() noexcept; |
| 482 | |
| 483 | _Hashtable(const _Hash& __h, const _Equal& __eq, |
| 484 | const allocator_type& __a) |
| 485 | : __hashtable_base(__h, __eq), |
| 486 | __hashtable_alloc(__node_alloc_type(__a)), |
| 487 | __enable_default_ctor(_Enable_default_constructor_tag{}) |
| 488 | { } |
| 489 | |
| 490 | template<bool _No_realloc = true> |
| 491 | static constexpr bool |
| 492 | _S_nothrow_move() |
| 493 | { |
| 494 | #if __cplusplus <= 201402L |
| 495 | return __and_<__bool_constant<_No_realloc>, |
| 496 | is_nothrow_copy_constructible<_Hash>, |
| 497 | is_nothrow_copy_constructible<_Equal>>::value; |
| 498 | #else |
| 499 | if constexpr (_No_realloc) |
| 500 | if constexpr (is_nothrow_copy_constructible<_Hash>()) |
| 501 | return is_nothrow_copy_constructible<_Equal>(); |
| 502 | return false; |
| 503 | #endif |
| 504 | } |
| 505 | |
| 506 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 507 | true_type /* alloc always equal */) |
| 508 | noexcept(_S_nothrow_move()); |
| 509 | |
| 510 | _Hashtable(_Hashtable&&, __node_alloc_type&&, |
| 511 | false_type /* alloc always equal */); |
| 512 | |
| 513 | template<typename _InputIterator> |
| 514 | _Hashtable(_InputIterator __first, _InputIterator __last, |
| 515 | size_type __bkt_count_hint, |
| 516 | const _Hash&, const _Equal&, const allocator_type&, |
| 517 | true_type __uks); |
| 518 | |
| 519 | template<typename _InputIterator> |
| 520 | _Hashtable(_InputIterator __first, _InputIterator __last, |
| 521 | size_type __bkt_count_hint, |
| 522 | const _Hash&, const _Equal&, const allocator_type&, |
| 523 | false_type __uks); |
| 524 | |
| 525 | public: |
| 526 | // Constructor, destructor, assignment, swap |
| 527 | _Hashtable() = default; |
| 528 | |
| 529 | _Hashtable(const _Hashtable&); |
| 530 | |
| 531 | _Hashtable(const _Hashtable&, const allocator_type&); |
| 532 | |
| 533 | explicit |
| 534 | _Hashtable(size_type __bkt_count_hint, |
| 535 | const _Hash& __hf = _Hash(), |
| 536 | const key_equal& __eql = key_equal(), |
| 537 | const allocator_type& __a = allocator_type()); |
| 538 | |
| 539 | // Use delegating constructors. |
| 540 | _Hashtable(_Hashtable&& __ht) |
| 541 | noexcept(_S_nothrow_move()) |
| 542 | : _Hashtable(std::move(__ht), std::move(__ht._M_node_allocator()), |
| 543 | true_type{}) |
| 544 | { } |
| 545 | |
| 546 | _Hashtable(_Hashtable&& __ht, const allocator_type& __a) |
| 547 | noexcept(_S_nothrow_move<__node_alloc_traits::_S_always_equal()>()) |
| 548 | : _Hashtable(std::move(__ht), __node_alloc_type(__a), |
| 549 | typename __node_alloc_traits::is_always_equal{}) |
| 550 | { } |
| 551 | |
| 552 | explicit |
| 553 | _Hashtable(const allocator_type& __a) |
| 554 | : __hashtable_alloc(__node_alloc_type(__a)), |
| 555 | __enable_default_ctor(_Enable_default_constructor_tag{}) |
| 556 | { } |
| 557 | |
| 558 | template<typename _InputIterator> |
| 559 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 560 | size_type __bkt_count_hint = 0, |
| 561 | const _Hash& __hf = _Hash(), |
| 562 | const key_equal& __eql = key_equal(), |
| 563 | const allocator_type& __a = allocator_type()) |
| 564 | : _Hashtable(__f, __l, __bkt_count_hint, __hf, __eql, __a, |
| 565 | __unique_keys{}) |
| 566 | { } |
| 567 | |
| 568 | _Hashtable(initializer_list<value_type> __l, |
| 569 | size_type __bkt_count_hint = 0, |
| 570 | const _Hash& __hf = _Hash(), |
| 571 | const key_equal& __eql = key_equal(), |
| 572 | const allocator_type& __a = allocator_type()) |
| 573 | : _Hashtable(__l.begin(), __l.end(), __bkt_count_hint, |
| 574 | __hf, __eql, __a, __unique_keys{}) |
| 575 | { } |
| 576 | |
| 577 | _Hashtable& |
| 578 | operator=(const _Hashtable& __ht); |
| 579 | |
| 580 | _Hashtable& |
| 581 | operator=(_Hashtable&& __ht) |
| 582 | noexcept(__node_alloc_traits::_S_nothrow_move() |
| 583 | && is_nothrow_move_assignable<_Hash>::value |
| 584 | && is_nothrow_move_assignable<_Equal>::value) |
| 585 | { |
| 586 | constexpr bool __move_storage = |
| 587 | __node_alloc_traits::_S_propagate_on_move_assign() |
| 588 | || __node_alloc_traits::_S_always_equal(); |
| 589 | _M_move_assign(std::move(__ht), __bool_constant<__move_storage>()); |
| 590 | return *this; |
| 591 | } |
| 592 | |
| 593 | _Hashtable& |
| 594 | operator=(initializer_list<value_type> __l) |
| 595 | { |
| 596 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
| 597 | _M_before_begin._M_nxt = nullptr; |
| 598 | clear(); |
| 599 | |
| 600 | // We consider that all elements of __l are going to be inserted. |
| 601 | auto __l_bkt_count = _M_rehash_policy._M_bkt_for_elements(__l.size()); |
| 602 | |
| 603 | // Do not shrink to keep potential user reservation. |
| 604 | if (_M_bucket_count < __l_bkt_count) |
| 605 | rehash(__l_bkt_count); |
| 606 | |
| 607 | this->_M_insert_range(__l.begin(), __l.end(), __roan, __unique_keys{}); |
| 608 | return *this; |
| 609 | } |
| 610 | |
| 611 | ~_Hashtable() noexcept; |
| 612 | |
| 613 | void |
| 614 | swap(_Hashtable&) |
| 615 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
| 616 | __is_nothrow_swappable<_Equal>>::value); |
| 617 | |
| 618 | // Basic container operations |
| 619 | iterator |
| 620 | begin() noexcept |
| 621 | { return iterator(_M_begin()); } |
| 622 | |
| 623 | const_iterator |
| 624 | begin() const noexcept |
| 625 | { return const_iterator(_M_begin()); } |
| 626 | |
| 627 | iterator |
| 628 | end() noexcept |
| 629 | { return iterator(nullptr); } |
| 630 | |
| 631 | const_iterator |
| 632 | end() const noexcept |
| 633 | { return const_iterator(nullptr); } |
| 634 | |
| 635 | const_iterator |
| 636 | cbegin() const noexcept |
| 637 | { return const_iterator(_M_begin()); } |
| 638 | |
| 639 | const_iterator |
| 640 | cend() const noexcept |
| 641 | { return const_iterator(nullptr); } |
| 642 | |
| 643 | size_type |
| 644 | size() const noexcept |
| 645 | { return _M_element_count; } |
| 646 | |
| 647 | _GLIBCXX_NODISCARD bool |
| 648 | empty() const noexcept |
| 649 | { return size() == 0; } |
| 650 | |
| 651 | allocator_type |
| 652 | get_allocator() const noexcept |
| 653 | { return allocator_type(this->_M_node_allocator()); } |
| 654 | |
| 655 | size_type |
| 656 | max_size() const noexcept |
| 657 | { return __node_alloc_traits::max_size(this->_M_node_allocator()); } |
| 658 | |
| 659 | // Observers |
| 660 | key_equal |
| 661 | key_eq() const |
| 662 | { return this->_M_eq(); } |
| 663 | |
| 664 | // hash_function, if present, comes from _Hash_code_base. |
| 665 | |
| 666 | // Bucket operations |
| 667 | size_type |
| 668 | bucket_count() const noexcept |
| 669 | { return _M_bucket_count; } |
| 670 | |
| 671 | size_type |
| 672 | max_bucket_count() const noexcept |
| 673 | { return max_size(); } |
| 674 | |
| 675 | size_type |
| 676 | bucket_size(size_type __bkt) const |
| 677 | { return std::distance(begin(__bkt), end(__bkt)); } |
| 678 | |
| 679 | size_type |
| 680 | bucket(const key_type& __k) const |
| 681 | { return _M_bucket_index(this->_M_hash_code(__k)); } |
| 682 | |
| 683 | local_iterator |
| 684 | begin(size_type __bkt) |
| 685 | { |
| 686 | return local_iterator(*this, _M_bucket_begin(__bkt), |
| 687 | __bkt, _M_bucket_count); |
| 688 | } |
| 689 | |
| 690 | local_iterator |
| 691 | end(size_type __bkt) |
| 692 | { return local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 693 | |
| 694 | const_local_iterator |
| 695 | begin(size_type __bkt) const |
| 696 | { |
| 697 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
| 698 | __bkt, _M_bucket_count); |
| 699 | } |
| 700 | |
| 701 | const_local_iterator |
| 702 | end(size_type __bkt) const |
| 703 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 704 | |
| 705 | // DR 691. |
| 706 | const_local_iterator |
| 707 | cbegin(size_type __bkt) const |
| 708 | { |
| 709 | return const_local_iterator(*this, _M_bucket_begin(__bkt), |
| 710 | __bkt, _M_bucket_count); |
| 711 | } |
| 712 | |
| 713 | const_local_iterator |
| 714 | cend(size_type __bkt) const |
| 715 | { return const_local_iterator(*this, nullptr, __bkt, _M_bucket_count); } |
| 716 | |
| 717 | float |
| 718 | load_factor() const noexcept |
| 719 | { |
| 720 | return static_cast<float>(size()) / static_cast<float>(bucket_count()); |
| 721 | } |
| 722 | |
| 723 | // max_load_factor, if present, comes from _Rehash_base. |
| 724 | |
| 725 | // Generalization of max_load_factor. Extension, not found in |
| 726 | // TR1. Only useful if _RehashPolicy is something other than |
| 727 | // the default. |
| 728 | const _RehashPolicy& |
| 729 | __rehash_policy() const |
| 730 | { return _M_rehash_policy; } |
| 731 | |
| 732 | void |
| 733 | __rehash_policy(const _RehashPolicy& __pol) |
| 734 | { _M_rehash_policy = __pol; } |
| 735 | |
| 736 | // Lookup. |
| 737 | iterator |
| 738 | find(const key_type& __k); |
| 739 | |
| 740 | const_iterator |
| 741 | find(const key_type& __k) const; |
| 742 | |
| 743 | size_type |
| 744 | count(const key_type& __k) const; |
| 745 | |
| 746 | std::pair<iterator, iterator> |
| 747 | equal_range(const key_type& __k); |
| 748 | |
| 749 | std::pair<const_iterator, const_iterator> |
| 750 | equal_range(const key_type& __k) const; |
| 751 | |
| 752 | #if __cplusplus >= 202002L |
| 753 | #define __cpp_lib_generic_unordered_lookup 201811L |
| 754 | |
| 755 | template<typename _Kt, |
| 756 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 757 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 758 | iterator |
| 759 | _M_find_tr(const _Kt& __k); |
| 760 | |
| 761 | template<typename _Kt, |
| 762 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 763 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 764 | const_iterator |
| 765 | _M_find_tr(const _Kt& __k) const; |
| 766 | |
| 767 | template<typename _Kt, |
| 768 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 769 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 770 | size_type |
| 771 | _M_count_tr(const _Kt& __k) const; |
| 772 | |
| 773 | template<typename _Kt, |
| 774 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 775 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 776 | pair<iterator, iterator> |
| 777 | _M_equal_range_tr(const _Kt& __k); |
| 778 | |
| 779 | template<typename _Kt, |
| 780 | typename = __has_is_transparent_t<_Hash, _Kt>, |
| 781 | typename = __has_is_transparent_t<_Equal, _Kt>> |
| 782 | pair<const_iterator, const_iterator> |
| 783 | _M_equal_range_tr(const _Kt& __k) const; |
| 784 | #endif // C++20 |
| 785 | |
| 786 | private: |
| 787 | // Bucket index computation helpers. |
| 788 | size_type |
| 789 | _M_bucket_index(const __node_value_type& __n) const noexcept |
| 790 | { return __hash_code_base::_M_bucket_index(__n, _M_bucket_count); } |
| 791 | |
| 792 | size_type |
| 793 | _M_bucket_index(__hash_code __c) const |
| 794 | { return __hash_code_base::_M_bucket_index(__c, _M_bucket_count); } |
| 795 | |
| 796 | // Find and insert helper functions and types |
| 797 | // Find the node before the one matching the criteria. |
| 798 | __node_base_ptr |
| 799 | _M_find_before_node(size_type, const key_type&, __hash_code) const; |
| 800 | |
| 801 | template<typename _Kt> |
| 802 | __node_base_ptr |
| 803 | _M_find_before_node_tr(size_type, const _Kt&, __hash_code) const; |
| 804 | |
| 805 | __node_ptr |
| 806 | _M_find_node(size_type __bkt, const key_type& __key, |
| 807 | __hash_code __c) const |
| 808 | { |
| 809 | __node_base_ptr __before_n = _M_find_before_node(__bkt, __key, __c); |
| 810 | if (__before_n) |
| 811 | return static_cast<__node_ptr>(__before_n->_M_nxt); |
| 812 | return nullptr; |
| 813 | } |
| 814 | |
| 815 | template<typename _Kt> |
| 816 | __node_ptr |
| 817 | _M_find_node_tr(size_type __bkt, const _Kt& __key, |
| 818 | __hash_code __c) const |
| 819 | { |
| 820 | auto __before_n = _M_find_before_node_tr(__bkt, __key, __c); |
| 821 | if (__before_n) |
| 822 | return static_cast<__node_ptr>(__before_n->_M_nxt); |
| 823 | return nullptr; |
| 824 | } |
| 825 | |
| 826 | // Insert a node at the beginning of a bucket. |
| 827 | void |
| 828 | _M_insert_bucket_begin(size_type, __node_ptr); |
| 829 | |
| 830 | // Remove the bucket first node |
| 831 | void |
| 832 | _M_remove_bucket_begin(size_type __bkt, __node_ptr __next_n, |
| 833 | size_type __next_bkt); |
| 834 | |
| 835 | // Get the node before __n in the bucket __bkt |
| 836 | __node_base_ptr |
| 837 | _M_get_previous_node(size_type __bkt, __node_ptr __n); |
| 838 | |
| 839 | // Insert node __n with hash code __code, in bucket __bkt if no |
| 840 | // rehash (assumes no element with same key already present). |
| 841 | // Takes ownership of __n if insertion succeeds, throws otherwise. |
| 842 | iterator |
| 843 | _M_insert_unique_node(size_type __bkt, __hash_code, |
| 844 | __node_ptr __n, size_type __n_elt = 1); |
| 845 | |
| 846 | // Insert node __n with key __k and hash code __code. |
| 847 | // Takes ownership of __n if insertion succeeds, throws otherwise. |
| 848 | iterator |
| 849 | _M_insert_multi_node(__node_ptr __hint, |
| 850 | __hash_code __code, __node_ptr __n); |
| 851 | |
| 852 | template<typename... _Args> |
| 853 | std::pair<iterator, bool> |
| 854 | _M_emplace(true_type __uks, _Args&&... __args); |
| 855 | |
| 856 | template<typename... _Args> |
| 857 | iterator |
| 858 | _M_emplace(false_type __uks, _Args&&... __args) |
| 859 | { return _M_emplace(cend(), __uks, std::forward<_Args>(__args)...); } |
| 860 | |
| 861 | // Emplace with hint, useless when keys are unique. |
| 862 | template<typename... _Args> |
| 863 | iterator |
| 864 | _M_emplace(const_iterator, true_type __uks, _Args&&... __args) |
| 865 | { return _M_emplace(__uks, std::forward<_Args>(__args)...).first; } |
| 866 | |
| 867 | template<typename... _Args> |
| 868 | iterator |
| 869 | _M_emplace(const_iterator, false_type __uks, _Args&&... __args); |
| 870 | |
| 871 | template<typename _Arg, typename _NodeGenerator> |
| 872 | std::pair<iterator, bool> |
| 873 | _M_insert(_Arg&&, const _NodeGenerator&, true_type __uks); |
| 874 | |
| 875 | template<typename _Arg, typename _NodeGenerator> |
| 876 | iterator |
| 877 | _M_insert(_Arg&& __arg, const _NodeGenerator& __node_gen, |
| 878 | false_type __uks) |
| 879 | { |
| 880 | return _M_insert(cend(), std::forward<_Arg>(__arg), __node_gen, |
| 881 | __uks); |
| 882 | } |
| 883 | |
| 884 | // Insert with hint, not used when keys are unique. |
| 885 | template<typename _Arg, typename _NodeGenerator> |
| 886 | iterator |
| 887 | _M_insert(const_iterator, _Arg&& __arg, |
| 888 | const _NodeGenerator& __node_gen, true_type __uks) |
| 889 | { |
| 890 | return |
| 891 | _M_insert(std::forward<_Arg>(__arg), __node_gen, __uks).first; |
| 892 | } |
| 893 | |
| 894 | // Insert with hint when keys are not unique. |
| 895 | template<typename _Arg, typename _NodeGenerator> |
| 896 | iterator |
| 897 | _M_insert(const_iterator, _Arg&&, |
| 898 | const _NodeGenerator&, false_type __uks); |
| 899 | |
| 900 | size_type |
| 901 | _M_erase(true_type __uks, const key_type&); |
| 902 | |
| 903 | size_type |
| 904 | _M_erase(false_type __uks, const key_type&); |
| 905 | |
| 906 | iterator |
| 907 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n); |
| 908 | |
| 909 | public: |
| 910 | // Emplace |
| 911 | template<typename... _Args> |
| 912 | __ireturn_type |
| 913 | emplace(_Args&&... __args) |
| 914 | { return _M_emplace(__unique_keys{}, std::forward<_Args>(__args)...); } |
| 915 | |
| 916 | template<typename... _Args> |
| 917 | iterator |
| 918 | emplace_hint(const_iterator __hint, _Args&&... __args) |
| 919 | { |
| 920 | return _M_emplace(__hint, __unique_keys{}, |
| 921 | std::forward<_Args>(__args)...); |
| 922 | } |
| 923 | |
| 924 | // Insert member functions via inheritance. |
| 925 | |
| 926 | // Erase |
| 927 | iterator |
| 928 | erase(const_iterator); |
| 929 | |
| 930 | // LWG 2059. |
| 931 | iterator |
| 932 | erase(iterator __it) |
| 933 | { return erase(const_iterator(__it)); } |
| 934 | |
| 935 | size_type |
| 936 | erase(const key_type& __k) |
| 937 | { return _M_erase(__unique_keys{}, __k); } |
| 938 | |
| 939 | iterator |
| 940 | erase(const_iterator, const_iterator); |
| 941 | |
| 942 | void |
| 943 | clear() noexcept; |
| 944 | |
| 945 | // Set number of buckets keeping it appropriate for container's number |
| 946 | // of elements. |
| 947 | void rehash(size_type __bkt_count); |
| 948 | |
| 949 | // DR 1189. |
| 950 | // reserve, if present, comes from _Rehash_base. |
| 951 | |
| 952 | #if __cplusplus > 201402L |
| 953 | /// Re-insert an extracted node into a container with unique keys. |
| 954 | insert_return_type |
| 955 | _M_reinsert_node(node_type&& __nh) |
| 956 | { |
| 957 | insert_return_type __ret; |
| 958 | if (__nh.empty()) |
| 959 | __ret.position = end(); |
| 960 | else |
| 961 | { |
| 962 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); |
| 963 | |
| 964 | const key_type& __k = __nh._M_key(); |
| 965 | __hash_code __code = this->_M_hash_code(__k); |
| 966 | size_type __bkt = _M_bucket_index(__code); |
| 967 | if (__node_ptr __n = _M_find_node(__bkt, __k, __code)) |
| 968 | { |
| 969 | __ret.node = std::move(__nh); |
| 970 | __ret.position = iterator(__n); |
| 971 | __ret.inserted = false; |
| 972 | } |
| 973 | else |
| 974 | { |
| 975 | __ret.position |
| 976 | = _M_insert_unique_node(__bkt, __code, __nh._M_ptr); |
| 977 | __nh._M_ptr = nullptr; |
| 978 | __ret.inserted = true; |
| 979 | } |
| 980 | } |
| 981 | return __ret; |
| 982 | } |
| 983 | |
| 984 | /// Re-insert an extracted node into a container with equivalent keys. |
| 985 | iterator |
| 986 | _M_reinsert_node_multi(const_iterator __hint, node_type&& __nh) |
| 987 | { |
| 988 | if (__nh.empty()) |
| 989 | return end(); |
| 990 | |
| 991 | __glibcxx_assert(get_allocator() == __nh.get_allocator()); |
| 992 | |
| 993 | const key_type& __k = __nh._M_key(); |
| 994 | auto __code = this->_M_hash_code(__k); |
| 995 | auto __ret |
| 996 | = _M_insert_multi_node(__hint._M_cur, __code, __nh._M_ptr); |
| 997 | __nh._M_ptr = nullptr; |
| 998 | return __ret; |
| 999 | } |
| 1000 | |
| 1001 | private: |
| 1002 | node_type |
| 1003 | _M_extract_node(size_t __bkt, __node_base_ptr __prev_n) |
| 1004 | { |
| 1005 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 1006 | if (__prev_n == _M_buckets[__bkt]) |
| 1007 | _M_remove_bucket_begin(__bkt, __n->_M_next(), |
| 1008 | __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
| 1009 | else if (__n->_M_nxt) |
| 1010 | { |
| 1011 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
| 1012 | if (__next_bkt != __bkt) |
| 1013 | _M_buckets[__next_bkt] = __prev_n; |
| 1014 | } |
| 1015 | |
| 1016 | __prev_n->_M_nxt = __n->_M_nxt; |
| 1017 | __n->_M_nxt = nullptr; |
| 1018 | --_M_element_count; |
| 1019 | return { __n, this->_M_node_allocator() }; |
| 1020 | } |
| 1021 | |
| 1022 | public: |
| 1023 | // Extract a node. |
| 1024 | node_type |
| 1025 | extract(const_iterator __pos) |
| 1026 | { |
| 1027 | size_t __bkt = _M_bucket_index(*__pos._M_cur); |
| 1028 | return _M_extract_node(__bkt, |
| 1029 | _M_get_previous_node(__bkt, __pos._M_cur)); |
| 1030 | } |
| 1031 | |
| 1032 | /// Extract a node. |
| 1033 | node_type |
| 1034 | extract(const _Key& __k) |
| 1035 | { |
| 1036 | node_type __nh; |
| 1037 | __hash_code __code = this->_M_hash_code(__k); |
| 1038 | std::size_t __bkt = _M_bucket_index(__code); |
| 1039 | if (__node_base_ptr __prev_node = _M_find_before_node(__bkt, __k, __code)) |
| 1040 | __nh = _M_extract_node(__bkt, __prev_node); |
| 1041 | return __nh; |
| 1042 | } |
| 1043 | |
| 1044 | /// Merge from a compatible container into one with unique keys. |
| 1045 | template<typename _Compatible_Hashtable> |
| 1046 | void |
| 1047 | _M_merge_unique(_Compatible_Hashtable& __src) noexcept |
| 1048 | { |
| 1049 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, |
| 1050 | node_type>, "Node types are compatible"); |
| 1051 | __glibcxx_assert(get_allocator() == __src.get_allocator()); |
| 1052 | |
| 1053 | auto __n_elt = __src.size(); |
| 1054 | for (auto __i = __src.begin(), __end = __src.end(); __i != __end;) |
| 1055 | { |
| 1056 | auto __pos = __i++; |
| 1057 | const key_type& __k = _ExtractKey{}(*__pos); |
| 1058 | __hash_code __code = this->_M_hash_code(__k); |
| 1059 | size_type __bkt = _M_bucket_index(__code); |
| 1060 | if (_M_find_node(__bkt, __k, __code) == nullptr) |
| 1061 | { |
| 1062 | auto __nh = __src.extract(__pos); |
| 1063 | _M_insert_unique_node(__bkt, __code, __nh._M_ptr, __n_elt); |
| 1064 | __nh._M_ptr = nullptr; |
| 1065 | __n_elt = 1; |
| 1066 | } |
| 1067 | else if (__n_elt != 1) |
| 1068 | --__n_elt; |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | /// Merge from a compatible container into one with equivalent keys. |
| 1073 | template<typename _Compatible_Hashtable> |
| 1074 | void |
| 1075 | _M_merge_multi(_Compatible_Hashtable& __src) noexcept |
| 1076 | { |
| 1077 | static_assert(is_same_v<typename _Compatible_Hashtable::node_type, |
| 1078 | node_type>, "Node types are compatible"); |
| 1079 | __glibcxx_assert(get_allocator() == __src.get_allocator()); |
| 1080 | |
| 1081 | this->reserve(size() + __src.size()); |
| 1082 | for (auto __i = __src.begin(), __end = __src.end(); __i != __end;) |
| 1083 | _M_reinsert_node_multi(cend(), __src.extract(__i++)); |
| 1084 | } |
| 1085 | #endif // C++17 |
| 1086 | |
| 1087 | private: |
| 1088 | // Helper rehash method used when keys are unique. |
| 1089 | void _M_rehash_aux(size_type __bkt_count, true_type __uks); |
| 1090 | |
| 1091 | // Helper rehash method used when keys can be non-unique. |
| 1092 | void _M_rehash_aux(size_type __bkt_count, false_type __uks); |
| 1093 | |
| 1094 | // Unconditionally change size of bucket array to n, restore |
| 1095 | // hash policy state to __state on exception. |
| 1096 | void _M_rehash(size_type __bkt_count, const __rehash_state& __state); |
| 1097 | }; |
| 1098 | |
| 1099 | |
| 1100 | // Definitions of class template _Hashtable's out-of-line member functions. |
| 1101 | template<typename _Key, typename _Value, typename _Alloc, |
| 1102 | typename _ExtractKey, typename _Equal, |
| 1103 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1104 | typename _RehashPolicy, typename _Traits> |
| 1105 | auto |
| 1106 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1107 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1108 | _M_bucket_begin(size_type __bkt) const |
| 1109 | -> __node_ptr |
| 1110 | { |
| 1111 | __node_base_ptr __n = _M_buckets[__bkt]; |
| 1112 | return __n ? static_cast<__node_ptr>(__n->_M_nxt) : nullptr; |
| 1113 | } |
| 1114 | |
| 1115 | template<typename _Key, typename _Value, typename _Alloc, |
| 1116 | typename _ExtractKey, typename _Equal, |
| 1117 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1118 | typename _RehashPolicy, typename _Traits> |
| 1119 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1120 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1121 | _Hashtable(size_type __bkt_count_hint, |
| 1122 | const _Hash& __h, const _Equal& __eq, const allocator_type& __a) |
| 1123 | : _Hashtable(__h, __eq, __a) |
| 1124 | { |
| 1125 | auto __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count_hint); |
| 1126 | if (__bkt_count > _M_bucket_count) |
| 1127 | { |
| 1128 | _M_buckets = _M_allocate_buckets(__bkt_count); |
| 1129 | _M_bucket_count = __bkt_count; |
| 1130 | } |
| 1131 | } |
| 1132 | |
| 1133 | template<typename _Key, typename _Value, typename _Alloc, |
| 1134 | typename _ExtractKey, typename _Equal, |
| 1135 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1136 | typename _RehashPolicy, typename _Traits> |
| 1137 | template<typename _InputIterator> |
| 1138 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1139 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1140 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 1141 | size_type __bkt_count_hint, |
| 1142 | const _Hash& __h, const _Equal& __eq, |
| 1143 | const allocator_type& __a, true_type /* __uks */) |
| 1144 | : _Hashtable(__bkt_count_hint, __h, __eq, __a) |
| 1145 | { |
| 1146 | for (; __f != __l; ++__f) |
| 1147 | this->insert(*__f); |
| 1148 | } |
| 1149 | |
| 1150 | template<typename _Key, typename _Value, typename _Alloc, |
| 1151 | typename _ExtractKey, typename _Equal, |
| 1152 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1153 | typename _RehashPolicy, typename _Traits> |
| 1154 | template<typename _InputIterator> |
| 1155 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1156 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1157 | _Hashtable(_InputIterator __f, _InputIterator __l, |
| 1158 | size_type __bkt_count_hint, |
| 1159 | const _Hash& __h, const _Equal& __eq, |
| 1160 | const allocator_type& __a, false_type /* __uks */) |
| 1161 | : _Hashtable(__h, __eq, __a) |
| 1162 | { |
| 1163 | auto __nb_elems = __detail::__distance_fw(__f, __l); |
| 1164 | auto __bkt_count = |
| 1165 | _M_rehash_policy._M_next_bkt( |
| 1166 | std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems), |
| 1167 | __bkt_count_hint)); |
| 1168 | |
| 1169 | if (__bkt_count > _M_bucket_count) |
| 1170 | { |
| 1171 | _M_buckets = _M_allocate_buckets(__bkt_count); |
| 1172 | _M_bucket_count = __bkt_count; |
| 1173 | } |
| 1174 | |
| 1175 | for (; __f != __l; ++__f) |
| 1176 | this->insert(*__f); |
| 1177 | } |
| 1178 | |
| 1179 | template<typename _Key, typename _Value, typename _Alloc, |
| 1180 | typename _ExtractKey, typename _Equal, |
| 1181 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1182 | typename _RehashPolicy, typename _Traits> |
| 1183 | auto |
| 1184 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1185 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1186 | operator=(const _Hashtable& __ht) |
| 1187 | -> _Hashtable& |
| 1188 | { |
| 1189 | if (&__ht == this) |
| 1190 | return *this; |
| 1191 | |
| 1192 | if (__node_alloc_traits::_S_propagate_on_copy_assign()) |
| 1193 | { |
| 1194 | auto& __this_alloc = this->_M_node_allocator(); |
| 1195 | auto& __that_alloc = __ht._M_node_allocator(); |
| 1196 | if (!__node_alloc_traits::_S_always_equal() |
| 1197 | && __this_alloc != __that_alloc) |
| 1198 | { |
| 1199 | // Replacement allocator cannot free existing storage. |
| 1200 | this->_M_deallocate_nodes(_M_begin()); |
| 1201 | _M_before_begin._M_nxt = nullptr; |
| 1202 | _M_deallocate_buckets(); |
| 1203 | _M_buckets = nullptr; |
| 1204 | std::__alloc_on_copy(__this_alloc, __that_alloc); |
| 1205 | __hashtable_base::operator=(__ht); |
| 1206 | _M_bucket_count = __ht._M_bucket_count; |
| 1207 | _M_element_count = __ht._M_element_count; |
| 1208 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1209 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1210 | __try |
| 1211 | { |
| 1212 | _M_assign(__ht, __alloc_node_gen); |
| 1213 | } |
| 1214 | __catch(...) |
| 1215 | { |
| 1216 | // _M_assign took care of deallocating all memory. Now we |
| 1217 | // must make sure this instance remains in a usable state. |
| 1218 | _M_reset(); |
| 1219 | __throw_exception_again; |
| 1220 | } |
| 1221 | return *this; |
| 1222 | } |
| 1223 | std::__alloc_on_copy(__this_alloc, __that_alloc); |
| 1224 | } |
| 1225 | |
| 1226 | // Reuse allocated buckets and nodes. |
| 1227 | _M_assign_elements(__ht); |
| 1228 | return *this; |
| 1229 | } |
| 1230 | |
| 1231 | template<typename _Key, typename _Value, typename _Alloc, |
| 1232 | typename _ExtractKey, typename _Equal, |
| 1233 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1234 | typename _RehashPolicy, typename _Traits> |
| 1235 | template<typename _Ht> |
| 1236 | void |
| 1237 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1238 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1239 | _M_assign_elements(_Ht&& __ht) |
| 1240 | { |
| 1241 | __buckets_ptr __former_buckets = nullptr; |
| 1242 | std::size_t __former_bucket_count = _M_bucket_count; |
| 1243 | const __rehash_state& __former_state = _M_rehash_policy._M_state(); |
| 1244 | |
| 1245 | if (_M_bucket_count != __ht._M_bucket_count) |
| 1246 | { |
| 1247 | __former_buckets = _M_buckets; |
| 1248 | _M_buckets = _M_allocate_buckets(__ht._M_bucket_count); |
| 1249 | _M_bucket_count = __ht._M_bucket_count; |
| 1250 | } |
| 1251 | else |
| 1252 | __builtin_memset(_M_buckets, 0, |
| 1253 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 1254 | |
| 1255 | __try |
| 1256 | { |
| 1257 | __hashtable_base::operator=(std::forward<_Ht>(__ht)); |
| 1258 | _M_element_count = __ht._M_element_count; |
| 1259 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1260 | __reuse_or_alloc_node_gen_t __roan(_M_begin(), *this); |
| 1261 | _M_before_begin._M_nxt = nullptr; |
| 1262 | _M_assign(std::forward<_Ht>(__ht), __roan); |
| 1263 | if (__former_buckets) |
| 1264 | _M_deallocate_buckets(__former_buckets, __former_bucket_count); |
| 1265 | } |
| 1266 | __catch(...) |
| 1267 | { |
| 1268 | if (__former_buckets) |
| 1269 | { |
| 1270 | // Restore previous buckets. |
| 1271 | _M_deallocate_buckets(); |
| 1272 | _M_rehash_policy._M_reset(__former_state); |
| 1273 | _M_buckets = __former_buckets; |
| 1274 | _M_bucket_count = __former_bucket_count; |
| 1275 | } |
| 1276 | __builtin_memset(_M_buckets, 0, |
| 1277 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 1278 | __throw_exception_again; |
| 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | template<typename _Key, typename _Value, typename _Alloc, |
| 1283 | typename _ExtractKey, typename _Equal, |
| 1284 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1285 | typename _RehashPolicy, typename _Traits> |
| 1286 | template<typename _Ht, typename _NodeGenerator> |
| 1287 | void |
| 1288 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1289 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1290 | _M_assign(_Ht&& __ht, const _NodeGenerator& __node_gen) |
| 1291 | { |
| 1292 | __buckets_ptr __buckets = nullptr; |
| 1293 | if (!_M_buckets) |
| 1294 | _M_buckets = __buckets = _M_allocate_buckets(_M_bucket_count); |
| 1295 | |
| 1296 | __try |
| 1297 | { |
| 1298 | if (!__ht._M_before_begin._M_nxt) |
| 1299 | return; |
| 1300 | |
| 1301 | // First deal with the special first node pointed to by |
| 1302 | // _M_before_begin. |
| 1303 | __node_ptr __ht_n = __ht._M_begin(); |
| 1304 | __node_ptr __this_n |
| 1305 | = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
| 1306 | this->_M_copy_code(*__this_n, *__ht_n); |
| 1307 | _M_update_bbegin(__this_n); |
| 1308 | |
| 1309 | // Then deal with other nodes. |
| 1310 | __node_ptr __prev_n = __this_n; |
| 1311 | for (__ht_n = __ht_n->_M_next(); __ht_n; __ht_n = __ht_n->_M_next()) |
| 1312 | { |
| 1313 | __this_n = __node_gen(__fwd_value_for<_Ht>(__ht_n->_M_v())); |
| 1314 | __prev_n->_M_nxt = __this_n; |
| 1315 | this->_M_copy_code(*__this_n, *__ht_n); |
| 1316 | size_type __bkt = _M_bucket_index(*__this_n); |
| 1317 | if (!_M_buckets[__bkt]) |
| 1318 | _M_buckets[__bkt] = __prev_n; |
| 1319 | __prev_n = __this_n; |
| 1320 | } |
| 1321 | } |
| 1322 | __catch(...) |
| 1323 | { |
| 1324 | clear(); |
| 1325 | if (__buckets) |
| 1326 | _M_deallocate_buckets(); |
| 1327 | __throw_exception_again; |
| 1328 | } |
| 1329 | } |
| 1330 | |
| 1331 | template<typename _Key, typename _Value, typename _Alloc, |
| 1332 | typename _ExtractKey, typename _Equal, |
| 1333 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1334 | typename _RehashPolicy, typename _Traits> |
| 1335 | void |
| 1336 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1337 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1338 | _M_reset() noexcept |
| 1339 | { |
| 1340 | _M_rehash_policy._M_reset(); |
| 1341 | _M_bucket_count = 1; |
| 1342 | _M_single_bucket = nullptr; |
| 1343 | _M_buckets = &_M_single_bucket; |
| 1344 | _M_before_begin._M_nxt = nullptr; |
| 1345 | _M_element_count = 0; |
| 1346 | } |
| 1347 | |
| 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> |
| 1352 | void |
| 1353 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1354 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1355 | _M_move_assign(_Hashtable&& __ht, true_type) |
| 1356 | { |
| 1357 | if (__builtin_expect(std::__addressof(__ht) == this, false)) |
| 1358 | return; |
| 1359 | |
| 1360 | this->_M_deallocate_nodes(_M_begin()); |
| 1361 | _M_deallocate_buckets(); |
| 1362 | __hashtable_base::operator=(std::move(__ht)); |
| 1363 | _M_rehash_policy = __ht._M_rehash_policy; |
| 1364 | if (!__ht._M_uses_single_bucket()) |
| 1365 | _M_buckets = __ht._M_buckets; |
| 1366 | else |
| 1367 | { |
| 1368 | _M_buckets = &_M_single_bucket; |
| 1369 | _M_single_bucket = __ht._M_single_bucket; |
| 1370 | } |
| 1371 | |
| 1372 | _M_bucket_count = __ht._M_bucket_count; |
| 1373 | _M_before_begin._M_nxt = __ht._M_before_begin._M_nxt; |
| 1374 | _M_element_count = __ht._M_element_count; |
| 1375 | std::__alloc_on_move(this->_M_node_allocator(), __ht._M_node_allocator()); |
| 1376 | |
| 1377 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
| 1378 | _M_update_bbegin(); |
| 1379 | __ht._M_reset(); |
| 1380 | } |
| 1381 | |
| 1382 | template<typename _Key, typename _Value, typename _Alloc, |
| 1383 | typename _ExtractKey, typename _Equal, |
| 1384 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1385 | typename _RehashPolicy, typename _Traits> |
| 1386 | void |
| 1387 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1388 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1389 | _M_move_assign(_Hashtable&& __ht, false_type) |
| 1390 | { |
| 1391 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
| 1392 | _M_move_assign(std::move(__ht), true_type{}); |
| 1393 | else |
| 1394 | { |
| 1395 | // Can't move memory, move elements then. |
| 1396 | _M_assign_elements(std::move(__ht)); |
| 1397 | __ht.clear(); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 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> |
| 1405 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1406 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1407 | _Hashtable(const _Hashtable& __ht) |
| 1408 | : __hashtable_base(__ht), |
| 1409 | __map_base(__ht), |
| 1410 | __rehash_base(__ht), |
| 1411 | __hashtable_alloc( |
| 1412 | __node_alloc_traits::_S_select_on_copy(__ht._M_node_allocator())), |
| 1413 | __enable_default_ctor(__ht), |
| 1414 | _M_buckets(nullptr), |
| 1415 | _M_bucket_count(__ht._M_bucket_count), |
| 1416 | _M_element_count(__ht._M_element_count), |
| 1417 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1418 | { |
| 1419 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1420 | _M_assign(__ht, __alloc_node_gen); |
| 1421 | } |
| 1422 | |
| 1423 | template<typename _Key, typename _Value, typename _Alloc, |
| 1424 | typename _ExtractKey, typename _Equal, |
| 1425 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1426 | typename _RehashPolicy, typename _Traits> |
| 1427 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1428 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1429 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 1430 | true_type /* alloc always equal */) |
| 1431 | noexcept(_S_nothrow_move()) |
| 1432 | : __hashtable_base(__ht), |
| 1433 | __map_base(__ht), |
| 1434 | __rehash_base(__ht), |
| 1435 | __hashtable_alloc(std::move(__a)), |
| 1436 | __enable_default_ctor(__ht), |
| 1437 | _M_buckets(__ht._M_buckets), |
| 1438 | _M_bucket_count(__ht._M_bucket_count), |
| 1439 | _M_before_begin(__ht._M_before_begin._M_nxt), |
| 1440 | _M_element_count(__ht._M_element_count), |
| 1441 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1442 | { |
| 1443 | // Update buckets if __ht is using its single bucket. |
| 1444 | if (__ht._M_uses_single_bucket()) |
| 1445 | { |
| 1446 | _M_buckets = &_M_single_bucket; |
| 1447 | _M_single_bucket = __ht._M_single_bucket; |
| 1448 | } |
| 1449 | |
| 1450 | // Fix bucket containing the _M_before_begin pointer that can't be moved. |
| 1451 | _M_update_bbegin(); |
| 1452 | |
| 1453 | __ht._M_reset(); |
| 1454 | } |
| 1455 | |
| 1456 | template<typename _Key, typename _Value, typename _Alloc, |
| 1457 | typename _ExtractKey, typename _Equal, |
| 1458 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1459 | typename _RehashPolicy, typename _Traits> |
| 1460 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1461 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1462 | _Hashtable(const _Hashtable& __ht, const allocator_type& __a) |
| 1463 | : __hashtable_base(__ht), |
| 1464 | __map_base(__ht), |
| 1465 | __rehash_base(__ht), |
| 1466 | __hashtable_alloc(__node_alloc_type(__a)), |
| 1467 | __enable_default_ctor(__ht), |
| 1468 | _M_buckets(), |
| 1469 | _M_bucket_count(__ht._M_bucket_count), |
| 1470 | _M_element_count(__ht._M_element_count), |
| 1471 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1472 | { |
| 1473 | __alloc_node_gen_t __alloc_node_gen(*this); |
| 1474 | _M_assign(__ht, __alloc_node_gen); |
| 1475 | } |
| 1476 | |
| 1477 | template<typename _Key, typename _Value, typename _Alloc, |
| 1478 | typename _ExtractKey, typename _Equal, |
| 1479 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1480 | typename _RehashPolicy, typename _Traits> |
| 1481 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1482 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1483 | _Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, |
| 1484 | false_type /* alloc always equal */) |
| 1485 | : __hashtable_base(__ht), |
| 1486 | __map_base(__ht), |
| 1487 | __rehash_base(__ht), |
| 1488 | __hashtable_alloc(std::move(__a)), |
| 1489 | __enable_default_ctor(__ht), |
| 1490 | _M_buckets(nullptr), |
| 1491 | _M_bucket_count(__ht._M_bucket_count), |
| 1492 | _M_element_count(__ht._M_element_count), |
| 1493 | _M_rehash_policy(__ht._M_rehash_policy) |
| 1494 | { |
| 1495 | if (__ht._M_node_allocator() == this->_M_node_allocator()) |
| 1496 | { |
| 1497 | if (__ht._M_uses_single_bucket()) |
| 1498 | { |
| 1499 | _M_buckets = &_M_single_bucket; |
| 1500 | _M_single_bucket = __ht._M_single_bucket; |
| 1501 | } |
| 1502 | else |
| 1503 | _M_buckets = __ht._M_buckets; |
| 1504 | |
| 1505 | // Fix bucket containing the _M_before_begin pointer that can't be |
| 1506 | // moved. |
| 1507 | _M_update_bbegin(__ht._M_begin()); |
| 1508 | |
| 1509 | __ht._M_reset(); |
| 1510 | } |
| 1511 | else |
| 1512 | { |
| 1513 | __alloc_node_gen_t __alloc_gen(*this); |
| 1514 | |
| 1515 | using _Fwd_Ht = typename |
| 1516 | conditional<__move_if_noexcept_cond<value_type>::value, |
| 1517 | const _Hashtable&, _Hashtable&&>::type; |
| 1518 | _M_assign(std::forward<_Fwd_Ht>(__ht), __alloc_gen); |
| 1519 | __ht.clear(); |
| 1520 | } |
| 1521 | } |
| 1522 | |
| 1523 | template<typename _Key, typename _Value, typename _Alloc, |
| 1524 | typename _ExtractKey, typename _Equal, |
| 1525 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1526 | typename _RehashPolicy, typename _Traits> |
| 1527 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1528 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1529 | ~_Hashtable() noexcept |
| 1530 | { |
| 1531 | clear(); |
| 1532 | _M_deallocate_buckets(); |
| 1533 | } |
| 1534 | |
| 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> |
| 1539 | void |
| 1540 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1541 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1542 | swap(_Hashtable& __x) |
| 1543 | noexcept(__and_<__is_nothrow_swappable<_Hash>, |
| 1544 | __is_nothrow_swappable<_Equal>>::value) |
| 1545 | { |
| 1546 | // The only base class with member variables is hash_code_base. |
| 1547 | // We define _Hash_code_base::_M_swap because different |
| 1548 | // specializations have different members. |
| 1549 | this->_M_swap(__x); |
| 1550 | |
| 1551 | std::__alloc_on_swap(this->_M_node_allocator(), __x._M_node_allocator()); |
| 1552 | std::swap(_M_rehash_policy, __x._M_rehash_policy); |
| 1553 | |
| 1554 | // Deal properly with potentially moved instances. |
| 1555 | if (this->_M_uses_single_bucket()) |
| 1556 | { |
| 1557 | if (!__x._M_uses_single_bucket()) |
| 1558 | { |
| 1559 | _M_buckets = __x._M_buckets; |
| 1560 | __x._M_buckets = &__x._M_single_bucket; |
| 1561 | } |
| 1562 | } |
| 1563 | else if (__x._M_uses_single_bucket()) |
| 1564 | { |
| 1565 | __x._M_buckets = _M_buckets; |
| 1566 | _M_buckets = &_M_single_bucket; |
| 1567 | } |
| 1568 | else |
| 1569 | std::swap(_M_buckets, __x._M_buckets); |
| 1570 | |
| 1571 | std::swap(_M_bucket_count, __x._M_bucket_count); |
| 1572 | std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt); |
| 1573 | std::swap(_M_element_count, __x._M_element_count); |
| 1574 | std::swap(_M_single_bucket, __x._M_single_bucket); |
| 1575 | |
| 1576 | // Fix buckets containing the _M_before_begin pointers that can't be |
| 1577 | // swapped. |
| 1578 | _M_update_bbegin(); |
| 1579 | __x._M_update_bbegin(); |
| 1580 | } |
| 1581 | |
| 1582 | template<typename _Key, typename _Value, typename _Alloc, |
| 1583 | typename _ExtractKey, typename _Equal, |
| 1584 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1585 | typename _RehashPolicy, typename _Traits> |
| 1586 | auto |
| 1587 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1588 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1589 | find(const key_type& __k) |
| 1590 | -> iterator |
| 1591 | { |
| 1592 | __hash_code __code = this->_M_hash_code(__k); |
| 1593 | std::size_t __bkt = _M_bucket_index(__code); |
| 1594 | return iterator(_M_find_node(__bkt, __k, __code)); |
| 1595 | } |
| 1596 | |
| 1597 | template<typename _Key, typename _Value, typename _Alloc, |
| 1598 | typename _ExtractKey, typename _Equal, |
| 1599 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1600 | typename _RehashPolicy, typename _Traits> |
| 1601 | auto |
| 1602 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1603 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1604 | find(const key_type& __k) const |
| 1605 | -> const_iterator |
| 1606 | { |
| 1607 | __hash_code __code = this->_M_hash_code(__k); |
| 1608 | std::size_t __bkt = _M_bucket_index(__code); |
| 1609 | return const_iterator(_M_find_node(__bkt, __k, __code)); |
| 1610 | } |
| 1611 | |
| 1612 | #if __cplusplus > 201703L |
| 1613 | template<typename _Key, typename _Value, typename _Alloc, |
| 1614 | typename _ExtractKey, typename _Equal, |
| 1615 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1616 | typename _RehashPolicy, typename _Traits> |
| 1617 | template<typename _Kt, typename, typename> |
| 1618 | auto |
| 1619 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1620 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1621 | _M_find_tr(const _Kt& __k) |
| 1622 | -> iterator |
| 1623 | { |
| 1624 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1625 | std::size_t __bkt = _M_bucket_index(__code); |
| 1626 | return iterator(_M_find_node_tr(__bkt, __k, __code)); |
| 1627 | } |
| 1628 | |
| 1629 | template<typename _Key, typename _Value, typename _Alloc, |
| 1630 | typename _ExtractKey, typename _Equal, |
| 1631 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1632 | typename _RehashPolicy, typename _Traits> |
| 1633 | template<typename _Kt, typename, typename> |
| 1634 | auto |
| 1635 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1636 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1637 | _M_find_tr(const _Kt& __k) const |
| 1638 | -> const_iterator |
| 1639 | { |
| 1640 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1641 | std::size_t __bkt = _M_bucket_index(__code); |
| 1642 | return const_iterator(_M_find_node_tr(__bkt, __k, __code)); |
| 1643 | } |
| 1644 | #endif |
| 1645 | |
| 1646 | template<typename _Key, typename _Value, typename _Alloc, |
| 1647 | typename _ExtractKey, typename _Equal, |
| 1648 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1649 | typename _RehashPolicy, typename _Traits> |
| 1650 | auto |
| 1651 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1652 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1653 | count(const key_type& __k) const |
| 1654 | -> size_type |
| 1655 | { |
| 1656 | auto __it = find(__k); |
| 1657 | if (!__it._M_cur) |
| 1658 | return 0; |
| 1659 | |
| 1660 | if (__unique_keys::value) |
| 1661 | return 1; |
| 1662 | |
| 1663 | // All equivalent values are next to each other, if we find a |
| 1664 | // non-equivalent value after an equivalent one it means that we won't |
| 1665 | // find any new equivalent value. |
| 1666 | size_type __result = 1; |
| 1667 | for (auto __ref = __it++; |
| 1668 | __it._M_cur && this->_M_node_equals(*__ref._M_cur, *__it._M_cur); |
| 1669 | ++__it) |
| 1670 | ++__result; |
| 1671 | |
| 1672 | return __result; |
| 1673 | } |
| 1674 | |
| 1675 | #if __cplusplus > 201703L |
| 1676 | template<typename _Key, typename _Value, typename _Alloc, |
| 1677 | typename _ExtractKey, typename _Equal, |
| 1678 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1679 | typename _RehashPolicy, typename _Traits> |
| 1680 | template<typename _Kt, typename, typename> |
| 1681 | auto |
| 1682 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1683 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1684 | _M_count_tr(const _Kt& __k) const |
| 1685 | -> size_type |
| 1686 | { |
| 1687 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1688 | std::size_t __bkt = _M_bucket_index(__code); |
| 1689 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 1690 | if (!__n) |
| 1691 | return 0; |
| 1692 | |
| 1693 | // All equivalent values are next to each other, if we find a |
| 1694 | // non-equivalent value after an equivalent one it means that we won't |
| 1695 | // find any new equivalent value. |
| 1696 | iterator __it(__n); |
| 1697 | size_type __result = 1; |
| 1698 | for (++__it; |
| 1699 | __it._M_cur && this->_M_equals_tr(__k, __code, *__it._M_cur); |
| 1700 | ++__it) |
| 1701 | ++__result; |
| 1702 | |
| 1703 | return __result; |
| 1704 | } |
| 1705 | #endif |
| 1706 | |
| 1707 | template<typename _Key, typename _Value, typename _Alloc, |
| 1708 | typename _ExtractKey, typename _Equal, |
| 1709 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1710 | typename _RehashPolicy, typename _Traits> |
| 1711 | auto |
| 1712 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1713 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1714 | equal_range(const key_type& __k) |
| 1715 | -> pair<iterator, iterator> |
| 1716 | { |
| 1717 | auto __ite = find(__k); |
| 1718 | if (!__ite._M_cur) |
| 1719 | return { __ite, __ite }; |
| 1720 | |
| 1721 | auto __beg = __ite++; |
| 1722 | if (__unique_keys::value) |
| 1723 | return { __beg, __ite }; |
| 1724 | |
| 1725 | // All equivalent values are next to each other, if we find a |
| 1726 | // non-equivalent value after an equivalent one it means that we won't |
| 1727 | // find any new equivalent value. |
| 1728 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
| 1729 | ++__ite; |
| 1730 | |
| 1731 | return { __beg, __ite }; |
| 1732 | } |
| 1733 | |
| 1734 | template<typename _Key, typename _Value, typename _Alloc, |
| 1735 | typename _ExtractKey, typename _Equal, |
| 1736 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1737 | typename _RehashPolicy, typename _Traits> |
| 1738 | auto |
| 1739 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1740 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1741 | equal_range(const key_type& __k) const |
| 1742 | -> pair<const_iterator, const_iterator> |
| 1743 | { |
| 1744 | auto __ite = find(__k); |
| 1745 | if (!__ite._M_cur) |
| 1746 | return { __ite, __ite }; |
| 1747 | |
| 1748 | auto __beg = __ite++; |
| 1749 | if (__unique_keys::value) |
| 1750 | return { __beg, __ite }; |
| 1751 | |
| 1752 | // All equivalent values are next to each other, if we find a |
| 1753 | // non-equivalent value after an equivalent one it means that we won't |
| 1754 | // find any new equivalent value. |
| 1755 | while (__ite._M_cur && this->_M_node_equals(*__beg._M_cur, *__ite._M_cur)) |
| 1756 | ++__ite; |
| 1757 | |
| 1758 | return { __beg, __ite }; |
| 1759 | } |
| 1760 | |
| 1761 | #if __cplusplus > 201703L |
| 1762 | template<typename _Key, typename _Value, typename _Alloc, |
| 1763 | typename _ExtractKey, typename _Equal, |
| 1764 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1765 | typename _RehashPolicy, typename _Traits> |
| 1766 | template<typename _Kt, typename, typename> |
| 1767 | auto |
| 1768 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1769 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1770 | _M_equal_range_tr(const _Kt& __k) |
| 1771 | -> pair<iterator, iterator> |
| 1772 | { |
| 1773 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1774 | std::size_t __bkt = _M_bucket_index(__code); |
| 1775 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 1776 | iterator __ite(__n); |
| 1777 | if (!__n) |
| 1778 | return { __ite, __ite }; |
| 1779 | |
| 1780 | // All equivalent values are next to each other, if we find a |
| 1781 | // non-equivalent value after an equivalent one it means that we won't |
| 1782 | // find any new equivalent value. |
| 1783 | auto __beg = __ite++; |
| 1784 | while (__ite._M_cur && this->_M_equals_tr(__k, __code, *__ite._M_cur)) |
| 1785 | ++__ite; |
| 1786 | |
| 1787 | return { __beg, __ite }; |
| 1788 | } |
| 1789 | |
| 1790 | template<typename _Key, typename _Value, typename _Alloc, |
| 1791 | typename _ExtractKey, typename _Equal, |
| 1792 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1793 | typename _RehashPolicy, typename _Traits> |
| 1794 | template<typename _Kt, typename, typename> |
| 1795 | auto |
| 1796 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1797 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1798 | _M_equal_range_tr(const _Kt& __k) const |
| 1799 | -> pair<const_iterator, const_iterator> |
| 1800 | { |
| 1801 | __hash_code __code = this->_M_hash_code_tr(__k); |
| 1802 | std::size_t __bkt = _M_bucket_index(__code); |
| 1803 | auto __n = _M_find_node_tr(__bkt, __k, __code); |
| 1804 | const_iterator __ite(__n); |
| 1805 | if (!__n) |
| 1806 | return { __ite, __ite }; |
| 1807 | |
| 1808 | // All equivalent values are next to each other, if we find a |
| 1809 | // non-equivalent value after an equivalent one it means that we won't |
| 1810 | // find any new equivalent value. |
| 1811 | auto __beg = __ite++; |
| 1812 | while (__ite._M_cur && this->_M_equals_tr(__k, __code, *__ite._M_cur)) |
| 1813 | ++__ite; |
| 1814 | |
| 1815 | return { __beg, __ite }; |
| 1816 | } |
| 1817 | #endif |
| 1818 | |
| 1819 | // Find the node before the one whose key compares equal to k in the bucket |
| 1820 | // bkt. Return nullptr if no node is found. |
| 1821 | template<typename _Key, typename _Value, typename _Alloc, |
| 1822 | typename _ExtractKey, typename _Equal, |
| 1823 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1824 | typename _RehashPolicy, typename _Traits> |
| 1825 | auto |
| 1826 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1827 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1828 | _M_find_before_node(size_type __bkt, const key_type& __k, |
| 1829 | __hash_code __code) const |
| 1830 | -> __node_base_ptr |
| 1831 | { |
| 1832 | __node_base_ptr __prev_p = _M_buckets[__bkt]; |
| 1833 | if (!__prev_p) |
| 1834 | return nullptr; |
| 1835 | |
| 1836 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt);; |
| 1837 | __p = __p->_M_next()) |
| 1838 | { |
| 1839 | if (this->_M_equals(__k, __code, *__p)) |
| 1840 | return __prev_p; |
| 1841 | |
| 1842 | if (!__p->_M_nxt || _M_bucket_index(*__p->_M_next()) != __bkt) |
| 1843 | break; |
| 1844 | __prev_p = __p; |
| 1845 | } |
| 1846 | |
| 1847 | return nullptr; |
| 1848 | } |
| 1849 | |
| 1850 | template<typename _Key, typename _Value, typename _Alloc, |
| 1851 | typename _ExtractKey, typename _Equal, |
| 1852 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1853 | typename _RehashPolicy, typename _Traits> |
| 1854 | template<typename _Kt> |
| 1855 | auto |
| 1856 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1857 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1858 | _M_find_before_node_tr(size_type __bkt, const _Kt& __k, |
| 1859 | __hash_code __code) const |
| 1860 | -> __node_base_ptr |
| 1861 | { |
| 1862 | __node_base_ptr __prev_p = _M_buckets[__bkt]; |
| 1863 | if (!__prev_p) |
| 1864 | return nullptr; |
| 1865 | |
| 1866 | for (__node_ptr __p = static_cast<__node_ptr>(__prev_p->_M_nxt);; |
| 1867 | __p = __p->_M_next()) |
| 1868 | { |
| 1869 | if (this->_M_equals_tr(__k, __code, *__p)) |
| 1870 | return __prev_p; |
| 1871 | |
| 1872 | if (!__p->_M_nxt || _M_bucket_index(*__p->_M_next()) != __bkt) |
| 1873 | break; |
| 1874 | __prev_p = __p; |
| 1875 | } |
| 1876 | |
| 1877 | return nullptr; |
| 1878 | } |
| 1879 | |
| 1880 | template<typename _Key, typename _Value, typename _Alloc, |
| 1881 | typename _ExtractKey, typename _Equal, |
| 1882 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1883 | typename _RehashPolicy, typename _Traits> |
| 1884 | void |
| 1885 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1886 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1887 | _M_insert_bucket_begin(size_type __bkt, __node_ptr __node) |
| 1888 | { |
| 1889 | if (_M_buckets[__bkt]) |
| 1890 | { |
| 1891 | // Bucket is not empty, we just need to insert the new node |
| 1892 | // after the bucket before begin. |
| 1893 | __node->_M_nxt = _M_buckets[__bkt]->_M_nxt; |
| 1894 | _M_buckets[__bkt]->_M_nxt = __node; |
| 1895 | } |
| 1896 | else |
| 1897 | { |
| 1898 | // The bucket is empty, the new node is inserted at the |
| 1899 | // beginning of the singly-linked list and the bucket will |
| 1900 | // contain _M_before_begin pointer. |
| 1901 | __node->_M_nxt = _M_before_begin._M_nxt; |
| 1902 | _M_before_begin._M_nxt = __node; |
| 1903 | |
| 1904 | if (__node->_M_nxt) |
| 1905 | // We must update former begin bucket that is pointing to |
| 1906 | // _M_before_begin. |
| 1907 | _M_buckets[_M_bucket_index(*__node->_M_next())] = __node; |
| 1908 | |
| 1909 | _M_buckets[__bkt] = &_M_before_begin; |
| 1910 | } |
| 1911 | } |
| 1912 | |
| 1913 | template<typename _Key, typename _Value, typename _Alloc, |
| 1914 | typename _ExtractKey, typename _Equal, |
| 1915 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1916 | typename _RehashPolicy, typename _Traits> |
| 1917 | void |
| 1918 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1919 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1920 | _M_remove_bucket_begin(size_type __bkt, __node_ptr __next, |
| 1921 | size_type __next_bkt) |
| 1922 | { |
| 1923 | if (!__next || __next_bkt != __bkt) |
| 1924 | { |
| 1925 | // Bucket is now empty |
| 1926 | // First update next bucket if any |
| 1927 | if (__next) |
| 1928 | _M_buckets[__next_bkt] = _M_buckets[__bkt]; |
| 1929 | |
| 1930 | // Second update before begin node if necessary |
| 1931 | if (&_M_before_begin == _M_buckets[__bkt]) |
| 1932 | _M_before_begin._M_nxt = __next; |
| 1933 | _M_buckets[__bkt] = nullptr; |
| 1934 | } |
| 1935 | } |
| 1936 | |
| 1937 | template<typename _Key, typename _Value, typename _Alloc, |
| 1938 | typename _ExtractKey, typename _Equal, |
| 1939 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1940 | typename _RehashPolicy, typename _Traits> |
| 1941 | auto |
| 1942 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1943 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1944 | _M_get_previous_node(size_type __bkt, __node_ptr __n) |
| 1945 | -> __node_base_ptr |
| 1946 | { |
| 1947 | __node_base_ptr __prev_n = _M_buckets[__bkt]; |
| 1948 | while (__prev_n->_M_nxt != __n) |
| 1949 | __prev_n = __prev_n->_M_nxt; |
| 1950 | return __prev_n; |
| 1951 | } |
| 1952 | |
| 1953 | template<typename _Key, typename _Value, typename _Alloc, |
| 1954 | typename _ExtractKey, typename _Equal, |
| 1955 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1956 | typename _RehashPolicy, typename _Traits> |
| 1957 | template<typename... _Args> |
| 1958 | auto |
| 1959 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1960 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1961 | _M_emplace(true_type /* __uks */, _Args&&... __args) |
| 1962 | -> pair<iterator, bool> |
| 1963 | { |
| 1964 | // First build the node to get access to the hash code |
| 1965 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
| 1966 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
| 1967 | __hash_code __code = this->_M_hash_code(__k); |
| 1968 | size_type __bkt = _M_bucket_index(__code); |
| 1969 | if (__node_ptr __p = _M_find_node(__bkt, __k, __code)) |
| 1970 | // There is already an equivalent node, no insertion |
| 1971 | return std::make_pair(iterator(__p), false); |
| 1972 | |
| 1973 | // Insert the node |
| 1974 | auto __pos = _M_insert_unique_node(__bkt, __code, __node._M_node); |
| 1975 | __node._M_node = nullptr; |
| 1976 | return { __pos, true }; |
| 1977 | } |
| 1978 | |
| 1979 | template<typename _Key, typename _Value, typename _Alloc, |
| 1980 | typename _ExtractKey, typename _Equal, |
| 1981 | typename _Hash, typename _RangeHash, typename _Unused, |
| 1982 | typename _RehashPolicy, typename _Traits> |
| 1983 | template<typename... _Args> |
| 1984 | auto |
| 1985 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 1986 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 1987 | _M_emplace(const_iterator __hint, false_type /* __uks */, |
| 1988 | _Args&&... __args) |
| 1989 | -> iterator |
| 1990 | { |
| 1991 | // First build the node to get its hash code. |
| 1992 | _Scoped_node __node { this, std::forward<_Args>(__args)... }; |
| 1993 | const key_type& __k = _ExtractKey{}(__node._M_node->_M_v()); |
| 1994 | |
| 1995 | __hash_code __code = this->_M_hash_code(__k); |
| 1996 | auto __pos |
| 1997 | = _M_insert_multi_node(__hint._M_cur, __code, __node._M_node); |
| 1998 | __node._M_node = nullptr; |
| 1999 | return __pos; |
| 2000 | } |
| 2001 | |
| 2002 | template<typename _Key, typename _Value, typename _Alloc, |
| 2003 | typename _ExtractKey, typename _Equal, |
| 2004 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2005 | typename _RehashPolicy, typename _Traits> |
| 2006 | auto |
| 2007 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2008 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2009 | _M_insert_unique_node(size_type __bkt, __hash_code __code, |
| 2010 | __node_ptr __node, size_type __n_elt) |
| 2011 | -> iterator |
| 2012 | { |
| 2013 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); |
| 2014 | std::pair<bool, std::size_t> __do_rehash |
| 2015 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, |
| 2016 | __n_elt); |
| 2017 | |
| 2018 | if (__do_rehash.first) |
| 2019 | { |
| 2020 | _M_rehash(__do_rehash.second, __saved_state); |
| 2021 | __bkt = _M_bucket_index(__code); |
| 2022 | } |
| 2023 | |
| 2024 | this->_M_store_code(*__node, __code); |
| 2025 | |
| 2026 | // Always insert at the beginning of the bucket. |
| 2027 | _M_insert_bucket_begin(__bkt, __node); |
| 2028 | ++_M_element_count; |
| 2029 | return iterator(__node); |
| 2030 | } |
| 2031 | |
| 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> |
| 2036 | auto |
| 2037 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2038 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2039 | _M_insert_multi_node(__node_ptr __hint, |
| 2040 | __hash_code __code, __node_ptr __node) |
| 2041 | -> iterator |
| 2042 | { |
| 2043 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); |
| 2044 | std::pair<bool, std::size_t> __do_rehash |
| 2045 | = _M_rehash_policy._M_need_rehash(_M_bucket_count, _M_element_count, 1); |
| 2046 | |
| 2047 | if (__do_rehash.first) |
| 2048 | _M_rehash(__do_rehash.second, __saved_state); |
| 2049 | |
| 2050 | this->_M_store_code(*__node, __code); |
| 2051 | const key_type& __k = _ExtractKey{}(__node->_M_v()); |
| 2052 | size_type __bkt = _M_bucket_index(__code); |
| 2053 | |
| 2054 | // Find the node before an equivalent one or use hint if it exists and |
| 2055 | // if it is equivalent. |
| 2056 | __node_base_ptr __prev |
| 2057 | = __builtin_expect(__hint != nullptr, false) |
| 2058 | && this->_M_equals(__k, __code, *__hint) |
| 2059 | ? __hint |
| 2060 | : _M_find_before_node(__bkt, __k, __code); |
| 2061 | |
| 2062 | if (__prev) |
| 2063 | { |
| 2064 | // Insert after the node before the equivalent one. |
| 2065 | __node->_M_nxt = __prev->_M_nxt; |
| 2066 | __prev->_M_nxt = __node; |
| 2067 | if (__builtin_expect(__prev == __hint, false)) |
| 2068 | // hint might be the last bucket node, in this case we need to |
| 2069 | // update next bucket. |
| 2070 | if (__node->_M_nxt |
| 2071 | && !this->_M_equals(__k, __code, *__node->_M_next())) |
| 2072 | { |
| 2073 | size_type __next_bkt = _M_bucket_index(*__node->_M_next()); |
| 2074 | if (__next_bkt != __bkt) |
| 2075 | _M_buckets[__next_bkt] = __node; |
| 2076 | } |
| 2077 | } |
| 2078 | else |
| 2079 | // The inserted node has no equivalent in the hashtable. We must |
| 2080 | // insert the new node at the beginning of the bucket to preserve |
| 2081 | // equivalent elements' relative positions. |
| 2082 | _M_insert_bucket_begin(__bkt, __node); |
| 2083 | ++_M_element_count; |
| 2084 | return iterator(__node); |
| 2085 | } |
| 2086 | |
| 2087 | // Insert v if no element with its key is already present. |
| 2088 | template<typename _Key, typename _Value, typename _Alloc, |
| 2089 | typename _ExtractKey, typename _Equal, |
| 2090 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2091 | typename _RehashPolicy, typename _Traits> |
| 2092 | template<typename _Arg, typename _NodeGenerator> |
| 2093 | auto |
| 2094 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2095 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2096 | _M_insert(_Arg&& __v, const _NodeGenerator& __node_gen, |
| 2097 | true_type /* __uks */) |
| 2098 | -> pair<iterator, bool> |
| 2099 | { |
| 2100 | const key_type& __k = _ExtractKey{}(__v); |
| 2101 | __hash_code __code = this->_M_hash_code(__k); |
| 2102 | size_type __bkt = _M_bucket_index(__code); |
| 2103 | |
| 2104 | if (__node_ptr __node = _M_find_node(__bkt, __k, __code)) |
| 2105 | return { iterator(__node), false }; |
| 2106 | |
| 2107 | _Scoped_node __node{ __node_gen(std::forward<_Arg>(__v)), this }; |
| 2108 | auto __pos |
| 2109 | = _M_insert_unique_node(__bkt, __code, __node._M_node); |
| 2110 | __node._M_node = nullptr; |
| 2111 | return { __pos, true }; |
| 2112 | } |
| 2113 | |
| 2114 | // Insert v unconditionally. |
| 2115 | template<typename _Key, typename _Value, typename _Alloc, |
| 2116 | typename _ExtractKey, typename _Equal, |
| 2117 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2118 | typename _RehashPolicy, typename _Traits> |
| 2119 | template<typename _Arg, typename _NodeGenerator> |
| 2120 | auto |
| 2121 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2122 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2123 | _M_insert(const_iterator __hint, _Arg&& __v, |
| 2124 | const _NodeGenerator& __node_gen, |
| 2125 | false_type /* __uks */) |
| 2126 | -> iterator |
| 2127 | { |
| 2128 | // First compute the hash code so that we don't do anything if it |
| 2129 | // throws. |
| 2130 | __hash_code __code = this->_M_hash_code(_ExtractKey{}(__v)); |
| 2131 | |
| 2132 | // Second allocate new node so that we don't rehash if it throws. |
| 2133 | _Scoped_node __node{ __node_gen(std::forward<_Arg>(__v)), this }; |
| 2134 | auto __pos |
| 2135 | = _M_insert_multi_node(__hint._M_cur, __code, __node._M_node); |
| 2136 | __node._M_node = nullptr; |
| 2137 | return __pos; |
| 2138 | } |
| 2139 | |
| 2140 | template<typename _Key, typename _Value, typename _Alloc, |
| 2141 | typename _ExtractKey, typename _Equal, |
| 2142 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2143 | typename _RehashPolicy, typename _Traits> |
| 2144 | auto |
| 2145 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2146 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2147 | erase(const_iterator __it) |
| 2148 | -> iterator |
| 2149 | { |
| 2150 | __node_ptr __n = __it._M_cur; |
| 2151 | std::size_t __bkt = _M_bucket_index(*__n); |
| 2152 | |
| 2153 | // Look for previous node to unlink it from the erased one, this |
| 2154 | // is why we need buckets to contain the before begin to make |
| 2155 | // this search fast. |
| 2156 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
| 2157 | return _M_erase(__bkt, __prev_n, __n); |
| 2158 | } |
| 2159 | |
| 2160 | template<typename _Key, typename _Value, typename _Alloc, |
| 2161 | typename _ExtractKey, typename _Equal, |
| 2162 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2163 | typename _RehashPolicy, typename _Traits> |
| 2164 | auto |
| 2165 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2166 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2167 | _M_erase(size_type __bkt, __node_base_ptr __prev_n, __node_ptr __n) |
| 2168 | -> iterator |
| 2169 | { |
| 2170 | if (__prev_n == _M_buckets[__bkt]) |
| 2171 | _M_remove_bucket_begin(__bkt, __n->_M_next(), |
| 2172 | __n->_M_nxt ? _M_bucket_index(*__n->_M_next()) : 0); |
| 2173 | else if (__n->_M_nxt) |
| 2174 | { |
| 2175 | size_type __next_bkt = _M_bucket_index(*__n->_M_next()); |
| 2176 | if (__next_bkt != __bkt) |
| 2177 | _M_buckets[__next_bkt] = __prev_n; |
| 2178 | } |
| 2179 | |
| 2180 | __prev_n->_M_nxt = __n->_M_nxt; |
| 2181 | iterator __result(__n->_M_next()); |
| 2182 | this->_M_deallocate_node(__n); |
| 2183 | --_M_element_count; |
| 2184 | |
| 2185 | return __result; |
| 2186 | } |
| 2187 | |
| 2188 | template<typename _Key, typename _Value, typename _Alloc, |
| 2189 | typename _ExtractKey, typename _Equal, |
| 2190 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2191 | typename _RehashPolicy, typename _Traits> |
| 2192 | auto |
| 2193 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2194 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2195 | _M_erase(true_type /* __uks */, const key_type& __k) |
| 2196 | -> size_type |
| 2197 | { |
| 2198 | __hash_code __code = this->_M_hash_code(__k); |
| 2199 | std::size_t __bkt = _M_bucket_index(__code); |
| 2200 | |
| 2201 | // Look for the node before the first matching node. |
| 2202 | __node_base_ptr __prev_n = _M_find_before_node(__bkt, __k, __code); |
| 2203 | if (!__prev_n) |
| 2204 | return 0; |
| 2205 | |
| 2206 | // We found a matching node, erase it. |
| 2207 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2208 | _M_erase(__bkt, __prev_n, __n); |
| 2209 | return 1; |
| 2210 | } |
| 2211 | |
| 2212 | template<typename _Key, typename _Value, typename _Alloc, |
| 2213 | typename _ExtractKey, typename _Equal, |
| 2214 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2215 | typename _RehashPolicy, typename _Traits> |
| 2216 | auto |
| 2217 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2218 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2219 | _M_erase(false_type /* __uks */, const key_type& __k) |
| 2220 | -> size_type |
| 2221 | { |
| 2222 | __hash_code __code = this->_M_hash_code(__k); |
| 2223 | std::size_t __bkt = _M_bucket_index(__code); |
| 2224 | |
| 2225 | // Look for the node before the first matching node. |
| 2226 | __node_base_ptr __prev_n = _M_find_before_node(__bkt, __k, __code); |
| 2227 | if (!__prev_n) |
| 2228 | return 0; |
| 2229 | |
| 2230 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2231 | // 526. Is it undefined if a function in the standard changes |
| 2232 | // in parameters? |
| 2233 | // We use one loop to find all matching nodes and another to deallocate |
| 2234 | // them so that the key stays valid during the first loop. It might be |
| 2235 | // invalidated indirectly when destroying nodes. |
| 2236 | __node_ptr __n = static_cast<__node_ptr>(__prev_n->_M_nxt); |
| 2237 | __node_ptr __n_last = __n->_M_next(); |
| 2238 | while (__n_last && this->_M_node_equals(*__n, *__n_last)) |
| 2239 | __n_last = __n_last->_M_next(); |
| 2240 | |
| 2241 | std::size_t __n_last_bkt = __n_last ? _M_bucket_index(*__n_last) : __bkt; |
| 2242 | |
| 2243 | // Deallocate nodes. |
| 2244 | size_type __result = 0; |
| 2245 | do |
| 2246 | { |
| 2247 | __node_ptr __p = __n->_M_next(); |
| 2248 | this->_M_deallocate_node(__n); |
| 2249 | __n = __p; |
| 2250 | ++__result; |
| 2251 | } |
| 2252 | while (__n != __n_last); |
| 2253 | |
| 2254 | _M_element_count -= __result; |
| 2255 | if (__prev_n == _M_buckets[__bkt]) |
| 2256 | _M_remove_bucket_begin(__bkt, __n_last, __n_last_bkt); |
| 2257 | else if (__n_last_bkt != __bkt) |
| 2258 | _M_buckets[__n_last_bkt] = __prev_n; |
| 2259 | __prev_n->_M_nxt = __n_last; |
| 2260 | return __result; |
| 2261 | } |
| 2262 | |
| 2263 | template<typename _Key, typename _Value, typename _Alloc, |
| 2264 | typename _ExtractKey, typename _Equal, |
| 2265 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2266 | typename _RehashPolicy, typename _Traits> |
| 2267 | auto |
| 2268 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2269 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2270 | erase(const_iterator __first, const_iterator __last) |
| 2271 | -> iterator |
| 2272 | { |
| 2273 | __node_ptr __n = __first._M_cur; |
| 2274 | __node_ptr __last_n = __last._M_cur; |
| 2275 | if (__n == __last_n) |
| 2276 | return iterator(__n); |
| 2277 | |
| 2278 | std::size_t __bkt = _M_bucket_index(*__n); |
| 2279 | |
| 2280 | __node_base_ptr __prev_n = _M_get_previous_node(__bkt, __n); |
| 2281 | bool __is_bucket_begin = __n == _M_bucket_begin(__bkt); |
| 2282 | std::size_t __n_bkt = __bkt; |
| 2283 | for (;;) |
| 2284 | { |
| 2285 | do |
| 2286 | { |
| 2287 | __node_ptr __tmp = __n; |
| 2288 | __n = __n->_M_next(); |
| 2289 | this->_M_deallocate_node(__tmp); |
| 2290 | --_M_element_count; |
| 2291 | if (!__n) |
| 2292 | break; |
| 2293 | __n_bkt = _M_bucket_index(*__n); |
| 2294 | } |
| 2295 | while (__n != __last_n && __n_bkt == __bkt); |
| 2296 | if (__is_bucket_begin) |
| 2297 | _M_remove_bucket_begin(__bkt, __n, __n_bkt); |
| 2298 | if (__n == __last_n) |
| 2299 | break; |
| 2300 | __is_bucket_begin = true; |
| 2301 | __bkt = __n_bkt; |
| 2302 | } |
| 2303 | |
| 2304 | if (__n && (__n_bkt != __bkt || __is_bucket_begin)) |
| 2305 | _M_buckets[__n_bkt] = __prev_n; |
| 2306 | __prev_n->_M_nxt = __n; |
| 2307 | return iterator(__n); |
| 2308 | } |
| 2309 | |
| 2310 | template<typename _Key, typename _Value, typename _Alloc, |
| 2311 | typename _ExtractKey, typename _Equal, |
| 2312 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2313 | typename _RehashPolicy, typename _Traits> |
| 2314 | void |
| 2315 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2316 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2317 | clear() noexcept |
| 2318 | { |
| 2319 | this->_M_deallocate_nodes(_M_begin()); |
| 2320 | __builtin_memset(_M_buckets, 0, |
| 2321 | _M_bucket_count * sizeof(__node_base_ptr)); |
| 2322 | _M_element_count = 0; |
| 2323 | _M_before_begin._M_nxt = nullptr; |
| 2324 | } |
| 2325 | |
| 2326 | template<typename _Key, typename _Value, typename _Alloc, |
| 2327 | typename _ExtractKey, typename _Equal, |
| 2328 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2329 | typename _RehashPolicy, typename _Traits> |
| 2330 | void |
| 2331 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2332 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2333 | rehash(size_type __bkt_count) |
| 2334 | { |
| 2335 | const __rehash_state& __saved_state = _M_rehash_policy._M_state(); |
| 2336 | __bkt_count |
| 2337 | = std::max(_M_rehash_policy._M_bkt_for_elements(_M_element_count + 1), |
| 2338 | __bkt_count); |
| 2339 | __bkt_count = _M_rehash_policy._M_next_bkt(__bkt_count); |
| 2340 | |
| 2341 | if (__bkt_count != _M_bucket_count) |
| 2342 | _M_rehash(__bkt_count, __saved_state); |
| 2343 | else |
| 2344 | // No rehash, restore previous state to keep it consistent with |
| 2345 | // container state. |
| 2346 | _M_rehash_policy._M_reset(__saved_state); |
| 2347 | } |
| 2348 | |
| 2349 | template<typename _Key, typename _Value, typename _Alloc, |
| 2350 | typename _ExtractKey, typename _Equal, |
| 2351 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2352 | typename _RehashPolicy, typename _Traits> |
| 2353 | void |
| 2354 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2355 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2356 | _M_rehash(size_type __bkt_count, const __rehash_state& __state) |
| 2357 | { |
| 2358 | __try |
| 2359 | { |
| 2360 | _M_rehash_aux(__bkt_count, __unique_keys{}); |
| 2361 | } |
| 2362 | __catch(...) |
| 2363 | { |
| 2364 | // A failure here means that buckets allocation failed. We only |
| 2365 | // have to restore hash policy previous state. |
| 2366 | _M_rehash_policy._M_reset(__state); |
| 2367 | __throw_exception_again; |
| 2368 | } |
| 2369 | } |
| 2370 | |
| 2371 | // Rehash when there is no equivalent elements. |
| 2372 | template<typename _Key, typename _Value, typename _Alloc, |
| 2373 | typename _ExtractKey, typename _Equal, |
| 2374 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2375 | typename _RehashPolicy, typename _Traits> |
| 2376 | void |
| 2377 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2378 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2379 | _M_rehash_aux(size_type __bkt_count, true_type /* __uks */) |
| 2380 | { |
| 2381 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
| 2382 | __node_ptr __p = _M_begin(); |
| 2383 | _M_before_begin._M_nxt = nullptr; |
| 2384 | std::size_t __bbegin_bkt = 0; |
| 2385 | while (__p) |
| 2386 | { |
| 2387 | __node_ptr __next = __p->_M_next(); |
| 2388 | std::size_t __bkt |
| 2389 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
| 2390 | if (!__new_buckets[__bkt]) |
| 2391 | { |
| 2392 | __p->_M_nxt = _M_before_begin._M_nxt; |
| 2393 | _M_before_begin._M_nxt = __p; |
| 2394 | __new_buckets[__bkt] = &_M_before_begin; |
| 2395 | if (__p->_M_nxt) |
| 2396 | __new_buckets[__bbegin_bkt] = __p; |
| 2397 | __bbegin_bkt = __bkt; |
| 2398 | } |
| 2399 | else |
| 2400 | { |
| 2401 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; |
| 2402 | __new_buckets[__bkt]->_M_nxt = __p; |
| 2403 | } |
| 2404 | |
| 2405 | __p = __next; |
| 2406 | } |
| 2407 | |
| 2408 | _M_deallocate_buckets(); |
| 2409 | _M_bucket_count = __bkt_count; |
| 2410 | _M_buckets = __new_buckets; |
| 2411 | } |
| 2412 | |
| 2413 | // Rehash when there can be equivalent elements, preserve their relative |
| 2414 | // order. |
| 2415 | template<typename _Key, typename _Value, typename _Alloc, |
| 2416 | typename _ExtractKey, typename _Equal, |
| 2417 | typename _Hash, typename _RangeHash, typename _Unused, |
| 2418 | typename _RehashPolicy, typename _Traits> |
| 2419 | void |
| 2420 | _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, |
| 2421 | _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>:: |
| 2422 | _M_rehash_aux(size_type __bkt_count, false_type /* __uks */) |
| 2423 | { |
| 2424 | __buckets_ptr __new_buckets = _M_allocate_buckets(__bkt_count); |
| 2425 | __node_ptr __p = _M_begin(); |
| 2426 | _M_before_begin._M_nxt = nullptr; |
| 2427 | std::size_t __bbegin_bkt = 0; |
| 2428 | std::size_t __prev_bkt = 0; |
| 2429 | __node_ptr __prev_p = nullptr; |
| 2430 | bool __check_bucket = false; |
| 2431 | |
| 2432 | while (__p) |
| 2433 | { |
| 2434 | __node_ptr __next = __p->_M_next(); |
| 2435 | std::size_t __bkt |
| 2436 | = __hash_code_base::_M_bucket_index(*__p, __bkt_count); |
| 2437 | |
| 2438 | if (__prev_p && __prev_bkt == __bkt) |
| 2439 | { |
| 2440 | // Previous insert was already in this bucket, we insert after |
| 2441 | // the previously inserted one to preserve equivalent elements |
| 2442 | // relative order. |
| 2443 | __p->_M_nxt = __prev_p->_M_nxt; |
| 2444 | __prev_p->_M_nxt = __p; |
| 2445 | |
| 2446 | // Inserting after a node in a bucket require to check that we |
| 2447 | // haven't change the bucket last node, in this case next |
| 2448 | // bucket containing its before begin node must be updated. We |
| 2449 | // schedule a check as soon as we move out of the sequence of |
| 2450 | // equivalent nodes to limit the number of checks. |
| 2451 | __check_bucket = true; |
| 2452 | } |
| 2453 | else |
| 2454 | { |
| 2455 | if (__check_bucket) |
| 2456 | { |
| 2457 | // Check if we shall update the next bucket because of |
| 2458 | // insertions into __prev_bkt bucket. |
| 2459 | if (__prev_p->_M_nxt) |
| 2460 | { |
| 2461 | std::size_t __next_bkt |
| 2462 | = __hash_code_base::_M_bucket_index( |
| 2463 | *__prev_p->_M_next(), __bkt_count); |
| 2464 | if (__next_bkt != __prev_bkt) |
| 2465 | __new_buckets[__next_bkt] = __prev_p; |
| 2466 | } |
| 2467 | __check_bucket = false; |
| 2468 | } |
| 2469 | |
| 2470 | if (!__new_buckets[__bkt]) |
| 2471 | { |
| 2472 | __p->_M_nxt = _M_before_begin._M_nxt; |
| 2473 | _M_before_begin._M_nxt = __p; |
| 2474 | __new_buckets[__bkt] = &_M_before_begin; |
| 2475 | if (__p->_M_nxt) |
| 2476 | __new_buckets[__bbegin_bkt] = __p; |
| 2477 | __bbegin_bkt = __bkt; |
| 2478 | } |
| 2479 | else |
| 2480 | { |
| 2481 | __p->_M_nxt = __new_buckets[__bkt]->_M_nxt; |
| 2482 | __new_buckets[__bkt]->_M_nxt = __p; |
| 2483 | } |
| 2484 | } |
| 2485 | __prev_p = __p; |
| 2486 | __prev_bkt = __bkt; |
| 2487 | __p = __next; |
| 2488 | } |
| 2489 | |
| 2490 | if (__check_bucket && __prev_p->_M_nxt) |
| 2491 | { |
| 2492 | std::size_t __next_bkt |
| 2493 | = __hash_code_base::_M_bucket_index(*__prev_p->_M_next(), |
| 2494 | __bkt_count); |
| 2495 | if (__next_bkt != __prev_bkt) |
| 2496 | __new_buckets[__next_bkt] = __prev_p; |
| 2497 | } |
| 2498 | |
| 2499 | _M_deallocate_buckets(); |
| 2500 | _M_bucket_count = __bkt_count; |
| 2501 | _M_buckets = __new_buckets; |
| 2502 | } |
| 2503 | |
| 2504 | #if __cplusplus > 201402L |
| 2505 | template<typename, typename, typename> class _Hash_merge_helper { }; |
| 2506 | #endif // C++17 |
| 2507 | |
| 2508 | #if __cpp_deduction_guides >= 201606 |
| 2509 | // Used to constrain deduction guides |
| 2510 | template<typename _Hash> |
| 2511 | using _RequireNotAllocatorOrIntegral |
| 2512 | = __enable_if_t<!__or_<is_integral<_Hash>, __is_allocator<_Hash>>::value>; |
| 2513 | #endif |
| 2514 | |
| 2515 | _GLIBCXX_END_NAMESPACE_VERSION |
| 2516 | } // namespace std |
| 2517 | |
| 2518 | #endif // _HASHTABLE_H |
| 2519 |
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