1 // RB tree implementation -*- C++ -*-
2
3 // Copyright (C) 2001-2021 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 /*
26 *
27 * Copyright (c) 1996,1997
28 * Silicon Graphics Computer Systems, Inc.
29 *
30 * Permission to use, copy, modify, distribute and sell this software
31 * and its documentation for any purpose is hereby granted without fee,
32 * provided that the above copyright notice appear in all copies and
33 * that both that copyright notice and this permission notice appear
34 * in supporting documentation. Silicon Graphics makes no
35 * representations about the suitability of this software for any
36 * purpose. It is provided "as is" without express or implied warranty.
37 *
38 *
39 * Copyright (c) 1994
40 * Hewlett-Packard Company
41 *
42 * Permission to use, copy, modify, distribute and sell this software
43 * and its documentation for any purpose is hereby granted without fee,
44 * provided that the above copyright notice appear in all copies and
45 * that both that copyright notice and this permission notice appear
46 * in supporting documentation. Hewlett-Packard Company makes no
47 * representations about the suitability of this software for any
48 * purpose. It is provided "as is" without express or implied warranty.
49 *
50 *
51 */
52
53 /** @file bits/stl_tree.h
54 * This is an internal header file, included by other library headers.
55 * Do not attempt to use it directly. @headername{map,set}
56 */
57
58 #ifndef _STL_TREE_H
59 #define _STL_TREE_H 1
60
61 #pragma GCC system_header
62
63 #include <bits/stl_algobase.h>
64 #include <bits/allocator.h>
65 #include <bits/stl_function.h>
66 #include <bits/cpp_type_traits.h>
67 #include <ext/alloc_traits.h>
68 #if __cplusplus >= 201103L
69 # include <ext/aligned_buffer.h>
70 #endif
71 #if __cplusplus > 201402L
72 # include <bits/node_handle.h>
73 #endif
74
_GLIBCXX_VISIBILITY(default)75 namespace std _GLIBCXX_VISIBILITY(default)
76 {
77 _GLIBCXX_BEGIN_NAMESPACE_VERSION
78
79 #if __cplusplus > 201103L
80 # define __cpp_lib_generic_associative_lookup 201304
81 #endif
82
83 // Red-black tree class, designed for use in implementing STL
84 // associative containers (set, multiset, map, and multimap). The
85 // insertion and deletion algorithms are based on those in Cormen,
86 // Leiserson, and Rivest, Introduction to Algorithms (MIT Press,
87 // 1990), except that
88 //
89 // (1) the header cell is maintained with links not only to the root
90 // but also to the leftmost node of the tree, to enable constant
91 // time begin(), and to the rightmost node of the tree, to enable
92 // linear time performance when used with the generic set algorithms
93 // (set_union, etc.)
94 //
95 // (2) when a node being deleted has two children its successor node
96 // is relinked into its place, rather than copied, so that the only
97 // iterators invalidated are those referring to the deleted node.
98
99 enum _Rb_tree_color { _S_red = false, _S_black = true };
100
101 struct _Rb_tree_node_base
102 {
103 typedef _Rb_tree_node_base* _Base_ptr;
104 typedef const _Rb_tree_node_base* _Const_Base_ptr;
105
106 _Rb_tree_color _M_color;
107 _Base_ptr _M_parent;
108 _Base_ptr _M_left;
109 _Base_ptr _M_right;
110
111 static _Base_ptr
112 _S_minimum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
113 {
114 while (__x->_M_left != 0) __x = __x->_M_left;
115 return __x;
116 }
117
118 static _Const_Base_ptr
119 _S_minimum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
120 {
121 while (__x->_M_left != 0) __x = __x->_M_left;
122 return __x;
123 }
124
125 static _Base_ptr
126 _S_maximum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
127 {
128 while (__x->_M_right != 0) __x = __x->_M_right;
129 return __x;
130 }
131
132 static _Const_Base_ptr
133 _S_maximum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
134 {
135 while (__x->_M_right != 0) __x = __x->_M_right;
136 return __x;
137 }
138 };
139
140 // Helper type offering value initialization guarantee on the compare functor.
141 template<typename _Key_compare>
142 struct _Rb_tree_key_compare
143 {
144 _Key_compare _M_key_compare;
145
146 _Rb_tree_key_compare()
147 _GLIBCXX_NOEXCEPT_IF(
148 is_nothrow_default_constructible<_Key_compare>::value)
149 : _M_key_compare()
150 { }
151
152 _Rb_tree_key_compare(const _Key_compare& __comp)
153 : _M_key_compare(__comp)
154 { }
155
156 #if __cplusplus >= 201103L
157 // Copy constructor added for consistency with C++98 mode.
158 _Rb_tree_key_compare(const _Rb_tree_key_compare&) = default;
159
160 _Rb_tree_key_compare(_Rb_tree_key_compare&& __x)
161 noexcept(is_nothrow_copy_constructible<_Key_compare>::value)
162 : _M_key_compare(__x._M_key_compare)
163 { }
164 #endif
165 };
166
167 // Helper type to manage default initialization of node count and header.
168 struct _Rb_tree_header
169 {
170 _Rb_tree_node_base _M_header;
171 size_t _M_node_count; // Keeps track of size of tree.
172
173 _Rb_tree_header() _GLIBCXX_NOEXCEPT
174 {
175 _M_header._M_color = _S_red;
176 _M_reset();
177 }
178
179 #if __cplusplus >= 201103L
180 _Rb_tree_header(_Rb_tree_header&& __x) noexcept
181 {
182 if (__x._M_header._M_parent != nullptr)
183 _M_move_data(__x);
184 else
185 {
186 _M_header._M_color = _S_red;
187 _M_reset();
188 }
189 }
190 #endif
191
192 void
193 _M_move_data(_Rb_tree_header& __from)
194 {
195 _M_header._M_color = __from._M_header._M_color;
196 _M_header._M_parent = __from._M_header._M_parent;
197 _M_header._M_left = __from._M_header._M_left;
198 _M_header._M_right = __from._M_header._M_right;
199 _M_header._M_parent->_M_parent = &_M_header;
200 _M_node_count = __from._M_node_count;
201
202 __from._M_reset();
203 }
204
205 void
206 _M_reset()
207 {
208 _M_header._M_parent = 0;
209 _M_header._M_left = &_M_header;
210 _M_header._M_right = &_M_header;
211 _M_node_count = 0;
212 }
213 };
214
215 template<typename _Val>
216 struct _Rb_tree_node : public _Rb_tree_node_base
217 {
218 typedef _Rb_tree_node<_Val>* _Link_type;
219
220 #if __cplusplus < 201103L
221 _Val _M_value_field;
222
223 _Val*
224 _M_valptr()
225 { return std::__addressof(_M_value_field); }
226
227 const _Val*
228 _M_valptr() const
229 { return std::__addressof(_M_value_field); }
230 #else
231 __gnu_cxx::__aligned_membuf<_Val> _M_storage;
232
233 _Val*
234 _M_valptr()
235 { return _M_storage._M_ptr(); }
236
237 const _Val*
238 _M_valptr() const
239 { return _M_storage._M_ptr(); }
240 #endif
241 };
242
243 _GLIBCXX_PURE _Rb_tree_node_base*
244 _Rb_tree_increment(_Rb_tree_node_base* __x) throw ();
245
246 _GLIBCXX_PURE const _Rb_tree_node_base*
247 _Rb_tree_increment(const _Rb_tree_node_base* __x) throw ();
248
249 _GLIBCXX_PURE _Rb_tree_node_base*
250 _Rb_tree_decrement(_Rb_tree_node_base* __x) throw ();
251
252 _GLIBCXX_PURE const _Rb_tree_node_base*
253 _Rb_tree_decrement(const _Rb_tree_node_base* __x) throw ();
254
255 template<typename _Tp>
256 struct _Rb_tree_iterator
257 {
258 typedef _Tp value_type;
259 typedef _Tp& reference;
260 typedef _Tp* pointer;
261
262 typedef bidirectional_iterator_tag iterator_category;
263 typedef ptrdiff_t difference_type;
264
265 typedef _Rb_tree_iterator<_Tp> _Self;
266 typedef _Rb_tree_node_base::_Base_ptr _Base_ptr;
267 typedef _Rb_tree_node<_Tp>* _Link_type;
268
269 _Rb_tree_iterator() _GLIBCXX_NOEXCEPT
270 : _M_node() { }
271
272 explicit
273 _Rb_tree_iterator(_Base_ptr __x) _GLIBCXX_NOEXCEPT
274 : _M_node(__x) { }
275
276 reference
277 operator*() const _GLIBCXX_NOEXCEPT
278 { return *static_cast<_Link_type>(_M_node)->_M_valptr(); }
279
280 pointer
281 operator->() const _GLIBCXX_NOEXCEPT
282 { return static_cast<_Link_type> (_M_node)->_M_valptr(); }
283
284 _Self&
285 operator++() _GLIBCXX_NOEXCEPT
286 {
287 _M_node = _Rb_tree_increment(_M_node);
288 return *this;
289 }
290
291 _Self
292 operator++(int) _GLIBCXX_NOEXCEPT
293 {
294 _Self __tmp = *this;
295 _M_node = _Rb_tree_increment(_M_node);
296 return __tmp;
297 }
298
299 _Self&
300 operator--() _GLIBCXX_NOEXCEPT
301 {
302 _M_node = _Rb_tree_decrement(_M_node);
303 return *this;
304 }
305
306 _Self
307 operator--(int) _GLIBCXX_NOEXCEPT
308 {
309 _Self __tmp = *this;
310 _M_node = _Rb_tree_decrement(_M_node);
311 return __tmp;
312 }
313
314 friend bool
315 operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
316 { return __x._M_node == __y._M_node; }
317
318 #if ! __cpp_lib_three_way_comparison
319 friend bool
320 operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
321 { return __x._M_node != __y._M_node; }
322 #endif
323
324 _Base_ptr _M_node;
325 };
326
327 template<typename _Tp>
328 struct _Rb_tree_const_iterator
329 {
330 typedef _Tp value_type;
331 typedef const _Tp& reference;
332 typedef const _Tp* pointer;
333
334 typedef _Rb_tree_iterator<_Tp> iterator;
335
336 typedef bidirectional_iterator_tag iterator_category;
337 typedef ptrdiff_t difference_type;
338
339 typedef _Rb_tree_const_iterator<_Tp> _Self;
340 typedef _Rb_tree_node_base::_Const_Base_ptr _Base_ptr;
341 typedef const _Rb_tree_node<_Tp>* _Link_type;
342
343 _Rb_tree_const_iterator() _GLIBCXX_NOEXCEPT
344 : _M_node() { }
345
346 explicit
347 _Rb_tree_const_iterator(_Base_ptr __x) _GLIBCXX_NOEXCEPT
348 : _M_node(__x) { }
349
350 _Rb_tree_const_iterator(const iterator& __it) _GLIBCXX_NOEXCEPT
351 : _M_node(__it._M_node) { }
352
353 iterator
354 _M_const_cast() const _GLIBCXX_NOEXCEPT
355 { return iterator(const_cast<typename iterator::_Base_ptr>(_M_node)); }
356
357 reference
358 operator*() const _GLIBCXX_NOEXCEPT
359 { return *static_cast<_Link_type>(_M_node)->_M_valptr(); }
360
361 pointer
362 operator->() const _GLIBCXX_NOEXCEPT
363 { return static_cast<_Link_type>(_M_node)->_M_valptr(); }
364
365 _Self&
366 operator++() _GLIBCXX_NOEXCEPT
367 {
368 _M_node = _Rb_tree_increment(_M_node);
369 return *this;
370 }
371
372 _Self
373 operator++(int) _GLIBCXX_NOEXCEPT
374 {
375 _Self __tmp = *this;
376 _M_node = _Rb_tree_increment(_M_node);
377 return __tmp;
378 }
379
380 _Self&
381 operator--() _GLIBCXX_NOEXCEPT
382 {
383 _M_node = _Rb_tree_decrement(_M_node);
384 return *this;
385 }
386
387 _Self
388 operator--(int) _GLIBCXX_NOEXCEPT
389 {
390 _Self __tmp = *this;
391 _M_node = _Rb_tree_decrement(_M_node);
392 return __tmp;
393 }
394
395 friend bool
396 operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
397 { return __x._M_node == __y._M_node; }
398
399 #if ! __cpp_lib_three_way_comparison
400 friend bool
401 operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
402 { return __x._M_node != __y._M_node; }
403 #endif
404
405 _Base_ptr _M_node;
406 };
407
408 void
409 _Rb_tree_insert_and_rebalance(const bool __insert_left,
410 _Rb_tree_node_base* __x,
411 _Rb_tree_node_base* __p,
412 _Rb_tree_node_base& __header) throw ();
413
414 _Rb_tree_node_base*
415 _Rb_tree_rebalance_for_erase(_Rb_tree_node_base* const __z,
416 _Rb_tree_node_base& __header) throw ();
417
418 #if __cplusplus > 201402L
419 template<typename _Tree1, typename _Cmp2>
420 struct _Rb_tree_merge_helper { };
421 #endif
422
423 template<typename _Key, typename _Val, typename _KeyOfValue,
424 typename _Compare, typename _Alloc = allocator<_Val> >
425 class _Rb_tree
426 {
427 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
428 rebind<_Rb_tree_node<_Val> >::other _Node_allocator;
429
430 typedef __gnu_cxx::__alloc_traits<_Node_allocator> _Alloc_traits;
431
432 protected:
433 typedef _Rb_tree_node_base* _Base_ptr;
434 typedef const _Rb_tree_node_base* _Const_Base_ptr;
435 typedef _Rb_tree_node<_Val>* _Link_type;
436 typedef const _Rb_tree_node<_Val>* _Const_Link_type;
437
438 private:
439 // Functor recycling a pool of nodes and using allocation once the pool
440 // is empty.
441 struct _Reuse_or_alloc_node
442 {
443 _Reuse_or_alloc_node(_Rb_tree& __t)
444 : _M_root(__t._M_root()), _M_nodes(__t._M_rightmost()), _M_t(__t)
445 {
446 if (_M_root)
447 {
448 _M_root->_M_parent = 0;
449
450 if (_M_nodes->_M_left)
451 _M_nodes = _M_nodes->_M_left;
452 }
453 else
454 _M_nodes = 0;
455 }
456
457 #if __cplusplus >= 201103L
458 _Reuse_or_alloc_node(const _Reuse_or_alloc_node&) = delete;
459 #endif
460
461 ~_Reuse_or_alloc_node()
462 { _M_t._M_erase(static_cast<_Link_type>(_M_root)); }
463
464 template<typename _Arg>
465 _Link_type
466 operator()(_GLIBCXX_FWDREF(_Arg) __arg)
467 {
468 _Link_type __node = static_cast<_Link_type>(_M_extract());
469 if (__node)
470 {
471 _M_t._M_destroy_node(__node);
472 _M_t._M_construct_node(__node, _GLIBCXX_FORWARD(_Arg, __arg));
473 return __node;
474 }
475
476 return _M_t._M_create_node(_GLIBCXX_FORWARD(_Arg, __arg));
477 }
478
479 private:
480 _Base_ptr
481 _M_extract()
482 {
483 if (!_M_nodes)
484 return _M_nodes;
485
486 _Base_ptr __node = _M_nodes;
487 _M_nodes = _M_nodes->_M_parent;
488 if (_M_nodes)
489 {
490 if (_M_nodes->_M_right == __node)
491 {
492 _M_nodes->_M_right = 0;
493
494 if (_M_nodes->_M_left)
495 {
496 _M_nodes = _M_nodes->_M_left;
497
498 while (_M_nodes->_M_right)
499 _M_nodes = _M_nodes->_M_right;
500
501 if (_M_nodes->_M_left)
502 _M_nodes = _M_nodes->_M_left;
503 }
504 }
505 else // __node is on the left.
506 _M_nodes->_M_left = 0;
507 }
508 else
509 _M_root = 0;
510
511 return __node;
512 }
513
514 _Base_ptr _M_root;
515 _Base_ptr _M_nodes;
516 _Rb_tree& _M_t;
517 };
518
519 // Functor similar to the previous one but without any pool of nodes to
520 // recycle.
521 struct _Alloc_node
522 {
523 _Alloc_node(_Rb_tree& __t)
524 : _M_t(__t) { }
525
526 template<typename _Arg>
527 _Link_type
528 operator()(_GLIBCXX_FWDREF(_Arg) __arg) const
529 { return _M_t._M_create_node(_GLIBCXX_FORWARD(_Arg, __arg)); }
530
531 private:
532 _Rb_tree& _M_t;
533 };
534
535 public:
536 typedef _Key key_type;
537 typedef _Val value_type;
538 typedef value_type* pointer;
539 typedef const value_type* const_pointer;
540 typedef value_type& reference;
541 typedef const value_type& const_reference;
542 typedef size_t size_type;
543 typedef ptrdiff_t difference_type;
544 typedef _Alloc allocator_type;
545
546 _Node_allocator&
547 _M_get_Node_allocator() _GLIBCXX_NOEXCEPT
548 { return this->_M_impl; }
549
550 const _Node_allocator&
551 _M_get_Node_allocator() const _GLIBCXX_NOEXCEPT
552 { return this->_M_impl; }
553
554 allocator_type
555 get_allocator() const _GLIBCXX_NOEXCEPT
556 { return allocator_type(_M_get_Node_allocator()); }
557
558 protected:
559 _Link_type
560 _M_get_node()
561 { return _Alloc_traits::allocate(_M_get_Node_allocator(), 1); }
562
563 void
564 _M_put_node(_Link_type __p) _GLIBCXX_NOEXCEPT
565 { _Alloc_traits::deallocate(_M_get_Node_allocator(), __p, 1); }
566
567 #if __cplusplus < 201103L
568 void
569 _M_construct_node(_Link_type __node, const value_type& __x)
570 {
571 __try
572 { get_allocator().construct(__node->_M_valptr(), __x); }
573 __catch(...)
574 {
575 _M_put_node(__node);
576 __throw_exception_again;
577 }
578 }
579
580 _Link_type
581 _M_create_node(const value_type& __x)
582 {
583 _Link_type __tmp = _M_get_node();
584 _M_construct_node(__tmp, __x);
585 return __tmp;
586 }
587 #else
588 template<typename... _Args>
589 void
590 _M_construct_node(_Link_type __node, _Args&&... __args)
591 {
592 __try
593 {
594 ::new(__node) _Rb_tree_node<_Val>;
595 _Alloc_traits::construct(_M_get_Node_allocator(),
596 __node->_M_valptr(),
597 std::forward<_Args>(__args)...);
598 }
599 __catch(...)
600 {
601 __node->~_Rb_tree_node<_Val>();
602 _M_put_node(__node);
603 __throw_exception_again;
604 }
605 }
606
607 template<typename... _Args>
608 _Link_type
609 _M_create_node(_Args&&... __args)
610 {
611 _Link_type __tmp = _M_get_node();
612 _M_construct_node(__tmp, std::forward<_Args>(__args)...);
613 return __tmp;
614 }
615 #endif
616
617 void
618 _M_destroy_node(_Link_type __p) _GLIBCXX_NOEXCEPT
619 {
620 #if __cplusplus < 201103L
621 get_allocator().destroy(__p->_M_valptr());
622 #else
623 _Alloc_traits::destroy(_M_get_Node_allocator(), __p->_M_valptr());
624 __p->~_Rb_tree_node<_Val>();
625 #endif
626 }
627
628 void
629 _M_drop_node(_Link_type __p) _GLIBCXX_NOEXCEPT
630 {
631 _M_destroy_node(__p);
632 _M_put_node(__p);
633 }
634
635 template<bool _MoveValue, typename _NodeGen>
636 _Link_type
637 _M_clone_node(_Link_type __x, _NodeGen& __node_gen)
638 {
639 #if __cplusplus >= 201103L
640 using _Vp = __conditional_t<_MoveValue,
641 value_type&&,
642 const value_type&>;
643 #endif
644 _Link_type __tmp
645 = __node_gen(_GLIBCXX_FORWARD(_Vp, *__x->_M_valptr()));
646 __tmp->_M_color = __x->_M_color;
647 __tmp->_M_left = 0;
648 __tmp->_M_right = 0;
649 return __tmp;
650 }
651
652 protected:
653 #if _GLIBCXX_INLINE_VERSION
654 template<typename _Key_compare>
655 #else
656 // Unused _Is_pod_comparator is kept as it is part of mangled name.
657 template<typename _Key_compare,
658 bool /* _Is_pod_comparator */ = __is_pod(_Key_compare)>
659 #endif
660 struct _Rb_tree_impl
661 : public _Node_allocator
662 , public _Rb_tree_key_compare<_Key_compare>
663 , public _Rb_tree_header
664 {
665 typedef _Rb_tree_key_compare<_Key_compare> _Base_key_compare;
666
667 _Rb_tree_impl()
668 _GLIBCXX_NOEXCEPT_IF(
669 is_nothrow_default_constructible<_Node_allocator>::value
670 && is_nothrow_default_constructible<_Base_key_compare>::value )
671 : _Node_allocator()
672 { }
673
674 _Rb_tree_impl(const _Rb_tree_impl& __x)
675 : _Node_allocator(_Alloc_traits::_S_select_on_copy(__x))
676 , _Base_key_compare(__x._M_key_compare)
677 , _Rb_tree_header()
678 { }
679
680 #if __cplusplus < 201103L
681 _Rb_tree_impl(const _Key_compare& __comp, const _Node_allocator& __a)
682 : _Node_allocator(__a), _Base_key_compare(__comp)
683 { }
684 #else
685 _Rb_tree_impl(_Rb_tree_impl&&)
686 noexcept( is_nothrow_move_constructible<_Base_key_compare>::value )
687 = default;
688
689 explicit
690 _Rb_tree_impl(_Node_allocator&& __a)
691 : _Node_allocator(std::move(__a))
692 { }
693
694 _Rb_tree_impl(_Rb_tree_impl&& __x, _Node_allocator&& __a)
695 : _Node_allocator(std::move(__a)),
696 _Base_key_compare(std::move(__x)),
697 _Rb_tree_header(std::move(__x))
698 { }
699
700 _Rb_tree_impl(const _Key_compare& __comp, _Node_allocator&& __a)
701 : _Node_allocator(std::move(__a)), _Base_key_compare(__comp)
702 { }
703 #endif
704 };
705
706 _Rb_tree_impl<_Compare> _M_impl;
707
708 protected:
709 _Base_ptr&
710 _M_root() _GLIBCXX_NOEXCEPT
711 { return this->_M_impl._M_header._M_parent; }
712
713 _Const_Base_ptr
714 _M_root() const _GLIBCXX_NOEXCEPT
715 { return this->_M_impl._M_header._M_parent; }
716
717 _Base_ptr&
718 _M_leftmost() _GLIBCXX_NOEXCEPT
719 { return this->_M_impl._M_header._M_left; }
720
721 _Const_Base_ptr
722 _M_leftmost() const _GLIBCXX_NOEXCEPT
723 { return this->_M_impl._M_header._M_left; }
724
725 _Base_ptr&
726 _M_rightmost() _GLIBCXX_NOEXCEPT
727 { return this->_M_impl._M_header._M_right; }
728
729 _Const_Base_ptr
730 _M_rightmost() const _GLIBCXX_NOEXCEPT
731 { return this->_M_impl._M_header._M_right; }
732
733 _Link_type
734 _M_mbegin() const _GLIBCXX_NOEXCEPT
735 { return static_cast<_Link_type>(this->_M_impl._M_header._M_parent); }
736
737 _Link_type
738 _M_begin() _GLIBCXX_NOEXCEPT
739 { return _M_mbegin(); }
740
741 _Const_Link_type
742 _M_begin() const _GLIBCXX_NOEXCEPT
743 {
744 return static_cast<_Const_Link_type>
745 (this->_M_impl._M_header._M_parent);
746 }
747
748 _Base_ptr
749 _M_end() _GLIBCXX_NOEXCEPT
750 { return &this->_M_impl._M_header; }
751
752 _Const_Base_ptr
753 _M_end() const _GLIBCXX_NOEXCEPT
754 { return &this->_M_impl._M_header; }
755
756 static const _Key&
757 _S_key(_Const_Link_type __x)
758 {
759 #if __cplusplus >= 201103L
760 // If we're asking for the key we're presumably using the comparison
761 // object, and so this is a good place to sanity check it.
762 static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
763 "comparison object must be invocable "
764 "with two arguments of key type");
765 # if __cplusplus >= 201703L
766 // _GLIBCXX_RESOLVE_LIB_DEFECTS
767 // 2542. Missing const requirements for associative containers
768 if constexpr (__is_invocable<_Compare&, const _Key&, const _Key&>{})
769 static_assert(
770 is_invocable_v<const _Compare&, const _Key&, const _Key&>,
771 "comparison object must be invocable as const");
772 # endif // C++17
773 #endif // C++11
774
775 return _KeyOfValue()(*__x->_M_valptr());
776 }
777
778 static _Link_type
779 _S_left(_Base_ptr __x) _GLIBCXX_NOEXCEPT
780 { return static_cast<_Link_type>(__x->_M_left); }
781
782 static _Const_Link_type
783 _S_left(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
784 { return static_cast<_Const_Link_type>(__x->_M_left); }
785
786 static _Link_type
787 _S_right(_Base_ptr __x) _GLIBCXX_NOEXCEPT
788 { return static_cast<_Link_type>(__x->_M_right); }
789
790 static _Const_Link_type
791 _S_right(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
792 { return static_cast<_Const_Link_type>(__x->_M_right); }
793
794 static const _Key&
795 _S_key(_Const_Base_ptr __x)
796 { return _S_key(static_cast<_Const_Link_type>(__x)); }
797
798 static _Base_ptr
799 _S_minimum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
800 { return _Rb_tree_node_base::_S_minimum(__x); }
801
802 static _Const_Base_ptr
803 _S_minimum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
804 { return _Rb_tree_node_base::_S_minimum(__x); }
805
806 static _Base_ptr
807 _S_maximum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
808 { return _Rb_tree_node_base::_S_maximum(__x); }
809
810 static _Const_Base_ptr
811 _S_maximum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
812 { return _Rb_tree_node_base::_S_maximum(__x); }
813
814 public:
815 typedef _Rb_tree_iterator<value_type> iterator;
816 typedef _Rb_tree_const_iterator<value_type> const_iterator;
817
818 typedef std::reverse_iterator<iterator> reverse_iterator;
819 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
820
821 #if __cplusplus > 201402L
822 using node_type = _Node_handle<_Key, _Val, _Node_allocator>;
823 using insert_return_type = _Node_insert_return<
824 __conditional_t<is_same_v<_Key, _Val>, const_iterator, iterator>,
825 node_type>;
826 #endif
827
828 pair<_Base_ptr, _Base_ptr>
829 _M_get_insert_unique_pos(const key_type& __k);
830
831 pair<_Base_ptr, _Base_ptr>
832 _M_get_insert_equal_pos(const key_type& __k);
833
834 pair<_Base_ptr, _Base_ptr>
835 _M_get_insert_hint_unique_pos(const_iterator __pos,
836 const key_type& __k);
837
838 pair<_Base_ptr, _Base_ptr>
839 _M_get_insert_hint_equal_pos(const_iterator __pos,
840 const key_type& __k);
841
842 private:
843 #if __cplusplus >= 201103L
844 template<typename _Arg, typename _NodeGen>
845 iterator
846 _M_insert_(_Base_ptr __x, _Base_ptr __y, _Arg&& __v, _NodeGen&);
847
848 iterator
849 _M_insert_node(_Base_ptr __x, _Base_ptr __y, _Link_type __z);
850
851 template<typename _Arg>
852 iterator
853 _M_insert_lower(_Base_ptr __y, _Arg&& __v);
854
855 template<typename _Arg>
856 iterator
857 _M_insert_equal_lower(_Arg&& __x);
858
859 iterator
860 _M_insert_lower_node(_Base_ptr __p, _Link_type __z);
861
862 iterator
863 _M_insert_equal_lower_node(_Link_type __z);
864 #else
865 template<typename _NodeGen>
866 iterator
867 _M_insert_(_Base_ptr __x, _Base_ptr __y,
868 const value_type& __v, _NodeGen&);
869
870 // _GLIBCXX_RESOLVE_LIB_DEFECTS
871 // 233. Insertion hints in associative containers.
872 iterator
873 _M_insert_lower(_Base_ptr __y, const value_type& __v);
874
875 iterator
876 _M_insert_equal_lower(const value_type& __x);
877 #endif
878
879 enum { __as_lvalue, __as_rvalue };
880
881 template<bool _MoveValues, typename _NodeGen>
882 _Link_type
883 _M_copy(_Link_type, _Base_ptr, _NodeGen&);
884
885 template<bool _MoveValues, typename _NodeGen>
886 _Link_type
887 _M_copy(const _Rb_tree& __x, _NodeGen& __gen)
888 {
889 _Link_type __root =
890 _M_copy<_MoveValues>(__x._M_mbegin(), _M_end(), __gen);
891 _M_leftmost() = _S_minimum(__root);
892 _M_rightmost() = _S_maximum(__root);
893 _M_impl._M_node_count = __x._M_impl._M_node_count;
894 return __root;
895 }
896
897 _Link_type
898 _M_copy(const _Rb_tree& __x)
899 {
900 _Alloc_node __an(*this);
901 return _M_copy<__as_lvalue>(__x, __an);
902 }
903
904 void
905 _M_erase(_Link_type __x);
906
907 iterator
908 _M_lower_bound(_Link_type __x, _Base_ptr __y,
909 const _Key& __k);
910
911 const_iterator
912 _M_lower_bound(_Const_Link_type __x, _Const_Base_ptr __y,
913 const _Key& __k) const;
914
915 iterator
916 _M_upper_bound(_Link_type __x, _Base_ptr __y,
917 const _Key& __k);
918
919 const_iterator
920 _M_upper_bound(_Const_Link_type __x, _Const_Base_ptr __y,
921 const _Key& __k) const;
922
923 public:
924 // allocation/deallocation
925 #if __cplusplus < 201103L
926 _Rb_tree() { }
927 #else
928 _Rb_tree() = default;
929 #endif
930
931 _Rb_tree(const _Compare& __comp,
932 const allocator_type& __a = allocator_type())
933 : _M_impl(__comp, _Node_allocator(__a)) { }
934
935 _Rb_tree(const _Rb_tree& __x)
936 : _M_impl(__x._M_impl)
937 {
938 if (__x._M_root() != 0)
939 _M_root() = _M_copy(__x);
940 }
941
942 #if __cplusplus >= 201103L
943 _Rb_tree(const allocator_type& __a)
944 : _M_impl(_Node_allocator(__a))
945 { }
946
947 _Rb_tree(const _Rb_tree& __x, const allocator_type& __a)
948 : _M_impl(__x._M_impl._M_key_compare, _Node_allocator(__a))
949 {
950 if (__x._M_root() != nullptr)
951 _M_root() = _M_copy(__x);
952 }
953
954 _Rb_tree(_Rb_tree&&) = default;
955
956 _Rb_tree(_Rb_tree&& __x, const allocator_type& __a)
957 : _Rb_tree(std::move(__x), _Node_allocator(__a))
958 { }
959
960 private:
961 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a, true_type)
962 noexcept(is_nothrow_default_constructible<_Compare>::value)
963 : _M_impl(std::move(__x._M_impl), std::move(__a))
964 { }
965
966 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a, false_type)
967 : _M_impl(__x._M_impl._M_key_compare, std::move(__a))
968 {
969 if (__x._M_root() != nullptr)
970 _M_move_data(__x, false_type{});
971 }
972
973 public:
974 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a)
975 noexcept( noexcept(
976 _Rb_tree(std::declval<_Rb_tree&&>(), std::declval<_Node_allocator&&>(),
977 std::declval<typename _Alloc_traits::is_always_equal>())) )
978 : _Rb_tree(std::move(__x), std::move(__a),
979 typename _Alloc_traits::is_always_equal{})
980 { }
981 #endif
982
983 ~_Rb_tree() _GLIBCXX_NOEXCEPT
984 { _M_erase(_M_begin()); }
985
986 _Rb_tree&
987 operator=(const _Rb_tree& __x);
988
989 // Accessors.
990 _Compare
991 key_comp() const
992 { return _M_impl._M_key_compare; }
993
994 iterator
995 begin() _GLIBCXX_NOEXCEPT
996 { return iterator(this->_M_impl._M_header._M_left); }
997
998 const_iterator
999 begin() const _GLIBCXX_NOEXCEPT
1000 { return const_iterator(this->_M_impl._M_header._M_left); }
1001
1002 iterator
1003 end() _GLIBCXX_NOEXCEPT
1004 { return iterator(&this->_M_impl._M_header); }
1005
1006 const_iterator
1007 end() const _GLIBCXX_NOEXCEPT
1008 { return const_iterator(&this->_M_impl._M_header); }
1009
1010 reverse_iterator
1011 rbegin() _GLIBCXX_NOEXCEPT
1012 { return reverse_iterator(end()); }
1013
1014 const_reverse_iterator
1015 rbegin() const _GLIBCXX_NOEXCEPT
1016 { return const_reverse_iterator(end()); }
1017
1018 reverse_iterator
1019 rend() _GLIBCXX_NOEXCEPT
1020 { return reverse_iterator(begin()); }
1021
1022 const_reverse_iterator
1023 rend() const _GLIBCXX_NOEXCEPT
1024 { return const_reverse_iterator(begin()); }
1025
1026 _GLIBCXX_NODISCARD bool
1027 empty() const _GLIBCXX_NOEXCEPT
1028 { return _M_impl._M_node_count == 0; }
1029
1030 size_type
1031 size() const _GLIBCXX_NOEXCEPT
1032 { return _M_impl._M_node_count; }
1033
1034 size_type
1035 max_size() const _GLIBCXX_NOEXCEPT
1036 { return _Alloc_traits::max_size(_M_get_Node_allocator()); }
1037
1038 void
1039 swap(_Rb_tree& __t)
1040 _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value);
1041
1042 // Insert/erase.
1043 #if __cplusplus >= 201103L
1044 template<typename _Arg>
1045 pair<iterator, bool>
1046 _M_insert_unique(_Arg&& __x);
1047
1048 template<typename _Arg>
1049 iterator
1050 _M_insert_equal(_Arg&& __x);
1051
1052 template<typename _Arg, typename _NodeGen>
1053 iterator
1054 _M_insert_unique_(const_iterator __pos, _Arg&& __x, _NodeGen&);
1055
1056 template<typename _Arg>
1057 iterator
1058 _M_insert_unique_(const_iterator __pos, _Arg&& __x)
1059 {
1060 _Alloc_node __an(*this);
1061 return _M_insert_unique_(__pos, std::forward<_Arg>(__x), __an);
1062 }
1063
1064 template<typename _Arg, typename _NodeGen>
1065 iterator
1066 _M_insert_equal_(const_iterator __pos, _Arg&& __x, _NodeGen&);
1067
1068 template<typename _Arg>
1069 iterator
1070 _M_insert_equal_(const_iterator __pos, _Arg&& __x)
1071 {
1072 _Alloc_node __an(*this);
1073 return _M_insert_equal_(__pos, std::forward<_Arg>(__x), __an);
1074 }
1075
1076 template<typename... _Args>
1077 pair<iterator, bool>
1078 _M_emplace_unique(_Args&&... __args);
1079
1080 template<typename... _Args>
1081 iterator
1082 _M_emplace_equal(_Args&&... __args);
1083
1084 template<typename... _Args>
1085 iterator
1086 _M_emplace_hint_unique(const_iterator __pos, _Args&&... __args);
1087
1088 template<typename... _Args>
1089 iterator
1090 _M_emplace_hint_equal(const_iterator __pos, _Args&&... __args);
1091
1092 template<typename _Iter>
1093 using __same_value_type
1094 = is_same<value_type, typename iterator_traits<_Iter>::value_type>;
1095
1096 template<typename _InputIterator>
1097 __enable_if_t<__same_value_type<_InputIterator>::value>
1098 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1099 {
1100 _Alloc_node __an(*this);
1101 for (; __first != __last; ++__first)
1102 _M_insert_unique_(end(), *__first, __an);
1103 }
1104
1105 template<typename _InputIterator>
1106 __enable_if_t<!__same_value_type<_InputIterator>::value>
1107 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1108 {
1109 for (; __first != __last; ++__first)
1110 _M_emplace_unique(*__first);
1111 }
1112
1113 template<typename _InputIterator>
1114 __enable_if_t<__same_value_type<_InputIterator>::value>
1115 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1116 {
1117 _Alloc_node __an(*this);
1118 for (; __first != __last; ++__first)
1119 _M_insert_equal_(end(), *__first, __an);
1120 }
1121
1122 template<typename _InputIterator>
1123 __enable_if_t<!__same_value_type<_InputIterator>::value>
1124 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1125 {
1126 _Alloc_node __an(*this);
1127 for (; __first != __last; ++__first)
1128 _M_emplace_equal(*__first);
1129 }
1130 #else
1131 pair<iterator, bool>
1132 _M_insert_unique(const value_type& __x);
1133
1134 iterator
1135 _M_insert_equal(const value_type& __x);
1136
1137 template<typename _NodeGen>
1138 iterator
1139 _M_insert_unique_(const_iterator __pos, const value_type& __x,
1140 _NodeGen&);
1141
1142 iterator
1143 _M_insert_unique_(const_iterator __pos, const value_type& __x)
1144 {
1145 _Alloc_node __an(*this);
1146 return _M_insert_unique_(__pos, __x, __an);
1147 }
1148
1149 template<typename _NodeGen>
1150 iterator
1151 _M_insert_equal_(const_iterator __pos, const value_type& __x,
1152 _NodeGen&);
1153 iterator
1154 _M_insert_equal_(const_iterator __pos, const value_type& __x)
1155 {
1156 _Alloc_node __an(*this);
1157 return _M_insert_equal_(__pos, __x, __an);
1158 }
1159
1160 template<typename _InputIterator>
1161 void
1162 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1163 {
1164 _Alloc_node __an(*this);
1165 for (; __first != __last; ++__first)
1166 _M_insert_unique_(end(), *__first, __an);
1167 }
1168
1169 template<typename _InputIterator>
1170 void
1171 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1172 {
1173 _Alloc_node __an(*this);
1174 for (; __first != __last; ++__first)
1175 _M_insert_equal_(end(), *__first, __an);
1176 }
1177 #endif
1178
1179 private:
1180 void
1181 _M_erase_aux(const_iterator __position);
1182
1183 void
1184 _M_erase_aux(const_iterator __first, const_iterator __last);
1185
1186 public:
1187 #if __cplusplus >= 201103L
1188 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1189 // DR 130. Associative erase should return an iterator.
1190 _GLIBCXX_ABI_TAG_CXX11
1191 iterator
1192 erase(const_iterator __position)
1193 {
1194 __glibcxx_assert(__position != end());
1195 const_iterator __result = __position;
1196 ++__result;
1197 _M_erase_aux(__position);
1198 return __result._M_const_cast();
1199 }
1200
1201 // LWG 2059.
1202 _GLIBCXX_ABI_TAG_CXX11
1203 iterator
1204 erase(iterator __position)
1205 {
1206 __glibcxx_assert(__position != end());
1207 iterator __result = __position;
1208 ++__result;
1209 _M_erase_aux(__position);
1210 return __result;
1211 }
1212 #else
1213 void
1214 erase(iterator __position)
1215 {
1216 __glibcxx_assert(__position != end());
1217 _M_erase_aux(__position);
1218 }
1219
1220 void
1221 erase(const_iterator __position)
1222 {
1223 __glibcxx_assert(__position != end());
1224 _M_erase_aux(__position);
1225 }
1226 #endif
1227
1228 size_type
1229 erase(const key_type& __x);
1230
1231 #if __cplusplus >= 201103L
1232 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1233 // DR 130. Associative erase should return an iterator.
1234 _GLIBCXX_ABI_TAG_CXX11
1235 iterator
1236 erase(const_iterator __first, const_iterator __last)
1237 {
1238 _M_erase_aux(__first, __last);
1239 return __last._M_const_cast();
1240 }
1241 #else
1242 void
1243 erase(iterator __first, iterator __last)
1244 { _M_erase_aux(__first, __last); }
1245
1246 void
1247 erase(const_iterator __first, const_iterator __last)
1248 { _M_erase_aux(__first, __last); }
1249 #endif
1250
1251 void
1252 clear() _GLIBCXX_NOEXCEPT
1253 {
1254 _M_erase(_M_begin());
1255 _M_impl._M_reset();
1256 }
1257
1258 // Set operations.
1259 iterator
1260 find(const key_type& __k);
1261
1262 const_iterator
1263 find(const key_type& __k) const;
1264
1265 size_type
1266 count(const key_type& __k) const;
1267
1268 iterator
1269 lower_bound(const key_type& __k)
1270 { return _M_lower_bound(_M_begin(), _M_end(), __k); }
1271
1272 const_iterator
1273 lower_bound(const key_type& __k) const
1274 { return _M_lower_bound(_M_begin(), _M_end(), __k); }
1275
1276 iterator
1277 upper_bound(const key_type& __k)
1278 { return _M_upper_bound(_M_begin(), _M_end(), __k); }
1279
1280 const_iterator
1281 upper_bound(const key_type& __k) const
1282 { return _M_upper_bound(_M_begin(), _M_end(), __k); }
1283
1284 pair<iterator, iterator>
1285 equal_range(const key_type& __k);
1286
1287 pair<const_iterator, const_iterator>
1288 equal_range(const key_type& __k) const;
1289
1290 #if __cplusplus >= 201402L
1291 template<typename _Kt,
1292 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1293 iterator
1294 _M_find_tr(const _Kt& __k)
1295 {
1296 const _Rb_tree* __const_this = this;
1297 return __const_this->_M_find_tr(__k)._M_const_cast();
1298 }
1299
1300 template<typename _Kt,
1301 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1302 const_iterator
1303 _M_find_tr(const _Kt& __k) const
1304 {
1305 auto __j = _M_lower_bound_tr(__k);
1306 if (__j != end() && _M_impl._M_key_compare(__k, _S_key(__j._M_node)))
1307 __j = end();
1308 return __j;
1309 }
1310
1311 template<typename _Kt,
1312 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1313 size_type
1314 _M_count_tr(const _Kt& __k) const
1315 {
1316 auto __p = _M_equal_range_tr(__k);
1317 return std::distance(__p.first, __p.second);
1318 }
1319
1320 template<typename _Kt,
1321 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1322 iterator
1323 _M_lower_bound_tr(const _Kt& __k)
1324 {
1325 const _Rb_tree* __const_this = this;
1326 return __const_this->_M_lower_bound_tr(__k)._M_const_cast();
1327 }
1328
1329 template<typename _Kt,
1330 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1331 const_iterator
1332 _M_lower_bound_tr(const _Kt& __k) const
1333 {
1334 auto __x = _M_begin();
1335 auto __y = _M_end();
1336 while (__x != 0)
1337 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1338 {
1339 __y = __x;
1340 __x = _S_left(__x);
1341 }
1342 else
1343 __x = _S_right(__x);
1344 return const_iterator(__y);
1345 }
1346
1347 template<typename _Kt,
1348 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1349 iterator
1350 _M_upper_bound_tr(const _Kt& __k)
1351 {
1352 const _Rb_tree* __const_this = this;
1353 return __const_this->_M_upper_bound_tr(__k)._M_const_cast();
1354 }
1355
1356 template<typename _Kt,
1357 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1358 const_iterator
1359 _M_upper_bound_tr(const _Kt& __k) const
1360 {
1361 auto __x = _M_begin();
1362 auto __y = _M_end();
1363 while (__x != 0)
1364 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1365 {
1366 __y = __x;
1367 __x = _S_left(__x);
1368 }
1369 else
1370 __x = _S_right(__x);
1371 return const_iterator(__y);
1372 }
1373
1374 template<typename _Kt,
1375 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1376 pair<iterator, iterator>
1377 _M_equal_range_tr(const _Kt& __k)
1378 {
1379 const _Rb_tree* __const_this = this;
1380 auto __ret = __const_this->_M_equal_range_tr(__k);
1381 return { __ret.first._M_const_cast(), __ret.second._M_const_cast() };
1382 }
1383
1384 template<typename _Kt,
1385 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1386 pair<const_iterator, const_iterator>
1387 _M_equal_range_tr(const _Kt& __k) const
1388 {
1389 auto __low = _M_lower_bound_tr(__k);
1390 auto __high = __low;
1391 auto& __cmp = _M_impl._M_key_compare;
1392 while (__high != end() && !__cmp(__k, _S_key(__high._M_node)))
1393 ++__high;
1394 return { __low, __high };
1395 }
1396 #endif
1397
1398 // Debugging.
1399 bool
1400 __rb_verify() const;
1401
1402 #if __cplusplus >= 201103L
1403 _Rb_tree&
1404 operator=(_Rb_tree&&)
1405 noexcept(_Alloc_traits::_S_nothrow_move()
1406 && is_nothrow_move_assignable<_Compare>::value);
1407
1408 template<typename _Iterator>
1409 void
1410 _M_assign_unique(_Iterator, _Iterator);
1411
1412 template<typename _Iterator>
1413 void
1414 _M_assign_equal(_Iterator, _Iterator);
1415
1416 private:
1417 // Move elements from container with equal allocator.
1418 void
1419 _M_move_data(_Rb_tree& __x, true_type)
1420 { _M_impl._M_move_data(__x._M_impl); }
1421
1422 // Move elements from container with possibly non-equal allocator,
1423 // which might result in a copy not a move.
1424 void
1425 _M_move_data(_Rb_tree&, false_type);
1426
1427 // Move assignment from container with equal allocator.
1428 void
1429 _M_move_assign(_Rb_tree&, true_type);
1430
1431 // Move assignment from container with possibly non-equal allocator,
1432 // which might result in a copy not a move.
1433 void
1434 _M_move_assign(_Rb_tree&, false_type);
1435 #endif
1436
1437 #if __cplusplus > 201402L
1438 public:
1439 /// Re-insert an extracted node.
1440 insert_return_type
1441 _M_reinsert_node_unique(node_type&& __nh)
1442 {
1443 insert_return_type __ret;
1444 if (__nh.empty())
1445 __ret.position = end();
1446 else
1447 {
1448 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1449
1450 auto __res = _M_get_insert_unique_pos(__nh._M_key());
1451 if (__res.second)
1452 {
1453 __ret.position
1454 = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1455 __nh._M_ptr = nullptr;
1456 __ret.inserted = true;
1457 }
1458 else
1459 {
1460 __ret.node = std::move(__nh);
1461 __ret.position = iterator(__res.first);
1462 __ret.inserted = false;
1463 }
1464 }
1465 return __ret;
1466 }
1467
1468 /// Re-insert an extracted node.
1469 iterator
1470 _M_reinsert_node_equal(node_type&& __nh)
1471 {
1472 iterator __ret;
1473 if (__nh.empty())
1474 __ret = end();
1475 else
1476 {
1477 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1478 auto __res = _M_get_insert_equal_pos(__nh._M_key());
1479 if (__res.second)
1480 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1481 else
1482 __ret = _M_insert_equal_lower_node(__nh._M_ptr);
1483 __nh._M_ptr = nullptr;
1484 }
1485 return __ret;
1486 }
1487
1488 /// Re-insert an extracted node.
1489 iterator
1490 _M_reinsert_node_hint_unique(const_iterator __hint, node_type&& __nh)
1491 {
1492 iterator __ret;
1493 if (__nh.empty())
1494 __ret = end();
1495 else
1496 {
1497 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1498 auto __res = _M_get_insert_hint_unique_pos(__hint, __nh._M_key());
1499 if (__res.second)
1500 {
1501 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1502 __nh._M_ptr = nullptr;
1503 }
1504 else
1505 __ret = iterator(__res.first);
1506 }
1507 return __ret;
1508 }
1509
1510 /// Re-insert an extracted node.
1511 iterator
1512 _M_reinsert_node_hint_equal(const_iterator __hint, node_type&& __nh)
1513 {
1514 iterator __ret;
1515 if (__nh.empty())
1516 __ret = end();
1517 else
1518 {
1519 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1520 auto __res = _M_get_insert_hint_equal_pos(__hint, __nh._M_key());
1521 if (__res.second)
1522 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1523 else
1524 __ret = _M_insert_equal_lower_node(__nh._M_ptr);
1525 __nh._M_ptr = nullptr;
1526 }
1527 return __ret;
1528 }
1529
1530 /// Extract a node.
1531 node_type
1532 extract(const_iterator __pos)
1533 {
1534 auto __ptr = _Rb_tree_rebalance_for_erase(
1535 __pos._M_const_cast()._M_node, _M_impl._M_header);
1536 --_M_impl._M_node_count;
1537 return { static_cast<_Link_type>(__ptr), _M_get_Node_allocator() };
1538 }
1539
1540 /// Extract a node.
1541 node_type
1542 extract(const key_type& __k)
1543 {
1544 node_type __nh;
1545 auto __pos = find(__k);
1546 if (__pos != end())
1547 __nh = extract(const_iterator(__pos));
1548 return __nh;
1549 }
1550
1551 template<typename _Compare2>
1552 using _Compatible_tree
1553 = _Rb_tree<_Key, _Val, _KeyOfValue, _Compare2, _Alloc>;
1554
1555 template<typename, typename>
1556 friend class _Rb_tree_merge_helper;
1557
1558 /// Merge from a compatible container into one with unique keys.
1559 template<typename _Compare2>
1560 void
1561 _M_merge_unique(_Compatible_tree<_Compare2>& __src) noexcept
1562 {
1563 using _Merge_helper = _Rb_tree_merge_helper<_Rb_tree, _Compare2>;
1564 for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
1565 {
1566 auto __pos = __i++;
1567 auto __res = _M_get_insert_unique_pos(_KeyOfValue()(*__pos));
1568 if (__res.second)
1569 {
1570 auto& __src_impl = _Merge_helper::_S_get_impl(__src);
1571 auto __ptr = _Rb_tree_rebalance_for_erase(
1572 __pos._M_node, __src_impl._M_header);
1573 --__src_impl._M_node_count;
1574 _M_insert_node(__res.first, __res.second,
1575 static_cast<_Link_type>(__ptr));
1576 }
1577 }
1578 }
1579
1580 /// Merge from a compatible container into one with equivalent keys.
1581 template<typename _Compare2>
1582 void
1583 _M_merge_equal(_Compatible_tree<_Compare2>& __src) noexcept
1584 {
1585 using _Merge_helper = _Rb_tree_merge_helper<_Rb_tree, _Compare2>;
1586 for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
1587 {
1588 auto __pos = __i++;
1589 auto __res = _M_get_insert_equal_pos(_KeyOfValue()(*__pos));
1590 if (__res.second)
1591 {
1592 auto& __src_impl = _Merge_helper::_S_get_impl(__src);
1593 auto __ptr = _Rb_tree_rebalance_for_erase(
1594 __pos._M_node, __src_impl._M_header);
1595 --__src_impl._M_node_count;
1596 _M_insert_node(__res.first, __res.second,
1597 static_cast<_Link_type>(__ptr));
1598 }
1599 }
1600 }
1601 #endif // C++17
1602
1603 friend bool
1604 operator==(const _Rb_tree& __x, const _Rb_tree& __y)
1605 {
1606 return __x.size() == __y.size()
1607 && std::equal(__x.begin(), __x.end(), __y.begin());
1608 }
1609
1610 #if __cpp_lib_three_way_comparison
1611 friend auto
1612 operator<=>(const _Rb_tree& __x, const _Rb_tree& __y)
1613 {
1614 if constexpr (requires { typename __detail::__synth3way_t<_Val>; })
1615 return std::lexicographical_compare_three_way(__x.begin(), __x.end(),
1616 __y.begin(), __y.end(),
1617 __detail::__synth3way);
1618 }
1619 #else
1620 friend bool
1621 operator<(const _Rb_tree& __x, const _Rb_tree& __y)
1622 {
1623 return std::lexicographical_compare(__x.begin(), __x.end(),
1624 __y.begin(), __y.end());
1625 }
1626 #endif
1627
1628 private:
1629 #if __cplusplus >= 201103L
1630 // An RAII _Node handle
1631 struct _Auto_node
1632 {
1633 template<typename... _Args>
1634 _Auto_node(_Rb_tree& __t, _Args&&... __args)
1635 : _M_t(__t),
1636 _M_node(__t._M_create_node(std::forward<_Args>(__args)...))
1637 { }
1638
1639 ~_Auto_node()
1640 {
1641 if (_M_node)
1642 _M_t._M_drop_node(_M_node);
1643 }
1644
1645 _Auto_node(_Auto_node&& __n)
1646 : _M_t(__n._M_t), _M_node(__n._M_node)
1647 { __n._M_node = nullptr; }
1648
1649 const _Key&
1650 _M_key() const
1651 { return _S_key(_M_node); }
1652
1653 iterator
1654 _M_insert(pair<_Base_ptr, _Base_ptr> __p)
1655 {
1656 auto __it = _M_t._M_insert_node(__p.first, __p.second, _M_node);
1657 _M_node = nullptr;
1658 return __it;
1659 }
1660
1661 iterator
1662 _M_insert_equal_lower()
1663 {
1664 auto __it = _M_t._M_insert_equal_lower_node(_M_node);
1665 _M_node = nullptr;
1666 return __it;
1667 }
1668
1669 _Rb_tree& _M_t;
1670 _Link_type _M_node;
1671 };
1672 #endif // C++11
1673 };
1674
1675 template<typename _Key, typename _Val, typename _KeyOfValue,
1676 typename _Compare, typename _Alloc>
1677 inline void
1678 swap(_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
1679 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __y)
1680 { __x.swap(__y); }
1681
1682 #if __cplusplus >= 201103L
1683 template<typename _Key, typename _Val, typename _KeyOfValue,
1684 typename _Compare, typename _Alloc>
1685 void
1686 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1687 _M_move_data(_Rb_tree& __x, false_type)
1688 {
1689 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1690 _M_move_data(__x, true_type());
1691 else
1692 {
1693 constexpr bool __move = !__move_if_noexcept_cond<value_type>::value;
1694 _Alloc_node __an(*this);
1695 _M_root() = _M_copy<__move>(__x, __an);
1696 if _GLIBCXX17_CONSTEXPR (__move)
1697 __x.clear();
1698 }
1699 }
1700
1701 template<typename _Key, typename _Val, typename _KeyOfValue,
1702 typename _Compare, typename _Alloc>
1703 inline void
1704 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1705 _M_move_assign(_Rb_tree& __x, true_type)
1706 {
1707 clear();
1708 if (__x._M_root() != nullptr)
1709 _M_move_data(__x, true_type());
1710 std::__alloc_on_move(_M_get_Node_allocator(),
1711 __x._M_get_Node_allocator());
1712 }
1713
1714 template<typename _Key, typename _Val, typename _KeyOfValue,
1715 typename _Compare, typename _Alloc>
1716 void
1717 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1718 _M_move_assign(_Rb_tree& __x, false_type)
1719 {
1720 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1721 return _M_move_assign(__x, true_type{});
1722
1723 // Try to move each node reusing existing nodes and copying __x nodes
1724 // structure.
1725 _Reuse_or_alloc_node __roan(*this);
1726 _M_impl._M_reset();
1727 if (__x._M_root() != nullptr)
1728 {
1729 _M_root() = _M_copy<__as_rvalue>(__x, __roan);
1730 __x.clear();
1731 }
1732 }
1733
1734 template<typename _Key, typename _Val, typename _KeyOfValue,
1735 typename _Compare, typename _Alloc>
1736 inline _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1737 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1738 operator=(_Rb_tree&& __x)
1739 noexcept(_Alloc_traits::_S_nothrow_move()
1740 && is_nothrow_move_assignable<_Compare>::value)
1741 {
1742 _M_impl._M_key_compare = std::move(__x._M_impl._M_key_compare);
1743 _M_move_assign(__x, __bool_constant<_Alloc_traits::_S_nothrow_move()>());
1744 return *this;
1745 }
1746
1747 template<typename _Key, typename _Val, typename _KeyOfValue,
1748 typename _Compare, typename _Alloc>
1749 template<typename _Iterator>
1750 void
1751 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1752 _M_assign_unique(_Iterator __first, _Iterator __last)
1753 {
1754 _Reuse_or_alloc_node __roan(*this);
1755 _M_impl._M_reset();
1756 for (; __first != __last; ++__first)
1757 _M_insert_unique_(end(), *__first, __roan);
1758 }
1759
1760 template<typename _Key, typename _Val, typename _KeyOfValue,
1761 typename _Compare, typename _Alloc>
1762 template<typename _Iterator>
1763 void
1764 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1765 _M_assign_equal(_Iterator __first, _Iterator __last)
1766 {
1767 _Reuse_or_alloc_node __roan(*this);
1768 _M_impl._M_reset();
1769 for (; __first != __last; ++__first)
1770 _M_insert_equal_(end(), *__first, __roan);
1771 }
1772 #endif
1773
1774 template<typename _Key, typename _Val, typename _KeyOfValue,
1775 typename _Compare, typename _Alloc>
1776 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1777 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1778 operator=(const _Rb_tree& __x)
1779 {
1780 if (this != std::__addressof(__x))
1781 {
1782 // Note that _Key may be a constant type.
1783 #if __cplusplus >= 201103L
1784 if (_Alloc_traits::_S_propagate_on_copy_assign())
1785 {
1786 auto& __this_alloc = this->_M_get_Node_allocator();
1787 auto& __that_alloc = __x._M_get_Node_allocator();
1788 if (!_Alloc_traits::_S_always_equal()
1789 && __this_alloc != __that_alloc)
1790 {
1791 // Replacement allocator cannot free existing storage, we need
1792 // to erase nodes first.
1793 clear();
1794 std::__alloc_on_copy(__this_alloc, __that_alloc);
1795 }
1796 }
1797 #endif
1798
1799 _Reuse_or_alloc_node __roan(*this);
1800 _M_impl._M_reset();
1801 _M_impl._M_key_compare = __x._M_impl._M_key_compare;
1802 if (__x._M_root() != 0)
1803 _M_root() = _M_copy<__as_lvalue>(__x, __roan);
1804 }
1805
1806 return *this;
1807 }
1808
1809 template<typename _Key, typename _Val, typename _KeyOfValue,
1810 typename _Compare, typename _Alloc>
1811 #if __cplusplus >= 201103L
1812 template<typename _Arg, typename _NodeGen>
1813 #else
1814 template<typename _NodeGen>
1815 #endif
1816 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1817 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1818 _M_insert_(_Base_ptr __x, _Base_ptr __p,
1819 #if __cplusplus >= 201103L
1820 _Arg&& __v,
1821 #else
1822 const _Val& __v,
1823 #endif
1824 _NodeGen& __node_gen)
1825 {
1826 bool __insert_left = (__x != 0 || __p == _M_end()
1827 || _M_impl._M_key_compare(_KeyOfValue()(__v),
1828 _S_key(__p)));
1829
1830 _Link_type __z = __node_gen(_GLIBCXX_FORWARD(_Arg, __v));
1831
1832 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1833 this->_M_impl._M_header);
1834 ++_M_impl._M_node_count;
1835 return iterator(__z);
1836 }
1837
1838 template<typename _Key, typename _Val, typename _KeyOfValue,
1839 typename _Compare, typename _Alloc>
1840 #if __cplusplus >= 201103L
1841 template<typename _Arg>
1842 #endif
1843 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1844 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1845 #if __cplusplus >= 201103L
1846 _M_insert_lower(_Base_ptr __p, _Arg&& __v)
1847 #else
1848 _M_insert_lower(_Base_ptr __p, const _Val& __v)
1849 #endif
1850 {
1851 bool __insert_left = (__p == _M_end()
1852 || !_M_impl._M_key_compare(_S_key(__p),
1853 _KeyOfValue()(__v)));
1854
1855 _Link_type __z = _M_create_node(_GLIBCXX_FORWARD(_Arg, __v));
1856
1857 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1858 this->_M_impl._M_header);
1859 ++_M_impl._M_node_count;
1860 return iterator(__z);
1861 }
1862
1863 template<typename _Key, typename _Val, typename _KeyOfValue,
1864 typename _Compare, typename _Alloc>
1865 #if __cplusplus >= 201103L
1866 template<typename _Arg>
1867 #endif
1868 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1869 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1870 #if __cplusplus >= 201103L
1871 _M_insert_equal_lower(_Arg&& __v)
1872 #else
1873 _M_insert_equal_lower(const _Val& __v)
1874 #endif
1875 {
1876 _Link_type __x = _M_begin();
1877 _Base_ptr __y = _M_end();
1878 while (__x != 0)
1879 {
1880 __y = __x;
1881 __x = !_M_impl._M_key_compare(_S_key(__x), _KeyOfValue()(__v)) ?
1882 _S_left(__x) : _S_right(__x);
1883 }
1884 return _M_insert_lower(__y, _GLIBCXX_FORWARD(_Arg, __v));
1885 }
1886
1887 template<typename _Key, typename _Val, typename _KoV,
1888 typename _Compare, typename _Alloc>
1889 template<bool _MoveValues, typename _NodeGen>
1890 typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::_Link_type
1891 _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::
1892 _M_copy(_Link_type __x, _Base_ptr __p, _NodeGen& __node_gen)
1893 {
1894 // Structural copy. __x and __p must be non-null.
1895 _Link_type __top = _M_clone_node<_MoveValues>(__x, __node_gen);
1896 __top->_M_parent = __p;
1897
1898 __try
1899 {
1900 if (__x->_M_right)
1901 __top->_M_right =
1902 _M_copy<_MoveValues>(_S_right(__x), __top, __node_gen);
1903 __p = __top;
1904 __x = _S_left(__x);
1905
1906 while (__x != 0)
1907 {
1908 _Link_type __y = _M_clone_node<_MoveValues>(__x, __node_gen);
1909 __p->_M_left = __y;
1910 __y->_M_parent = __p;
1911 if (__x->_M_right)
1912 __y->_M_right = _M_copy<_MoveValues>(_S_right(__x),
1913 __y, __node_gen);
1914 __p = __y;
1915 __x = _S_left(__x);
1916 }
1917 }
1918 __catch(...)
1919 {
1920 _M_erase(__top);
1921 __throw_exception_again;
1922 }
1923 return __top;
1924 }
1925
1926 template<typename _Key, typename _Val, typename _KeyOfValue,
1927 typename _Compare, typename _Alloc>
1928 void
1929 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1930 _M_erase(_Link_type __x)
1931 {
1932 // Erase without rebalancing.
1933 while (__x != 0)
1934 {
1935 _M_erase(_S_right(__x));
1936 _Link_type __y = _S_left(__x);
1937 _M_drop_node(__x);
1938 __x = __y;
1939 }
1940 }
1941
1942 template<typename _Key, typename _Val, typename _KeyOfValue,
1943 typename _Compare, typename _Alloc>
1944 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1945 _Compare, _Alloc>::iterator
1946 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1947 _M_lower_bound(_Link_type __x, _Base_ptr __y,
1948 const _Key& __k)
1949 {
1950 while (__x != 0)
1951 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1952 __y = __x, __x = _S_left(__x);
1953 else
1954 __x = _S_right(__x);
1955 return iterator(__y);
1956 }
1957
1958 template<typename _Key, typename _Val, typename _KeyOfValue,
1959 typename _Compare, typename _Alloc>
1960 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1961 _Compare, _Alloc>::const_iterator
1962 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1963 _M_lower_bound(_Const_Link_type __x, _Const_Base_ptr __y,
1964 const _Key& __k) const
1965 {
1966 while (__x != 0)
1967 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1968 __y = __x, __x = _S_left(__x);
1969 else
1970 __x = _S_right(__x);
1971 return const_iterator(__y);
1972 }
1973
1974 template<typename _Key, typename _Val, typename _KeyOfValue,
1975 typename _Compare, typename _Alloc>
1976 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1977 _Compare, _Alloc>::iterator
1978 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1979 _M_upper_bound(_Link_type __x, _Base_ptr __y,
1980 const _Key& __k)
1981 {
1982 while (__x != 0)
1983 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1984 __y = __x, __x = _S_left(__x);
1985 else
1986 __x = _S_right(__x);
1987 return iterator(__y);
1988 }
1989
1990 template<typename _Key, typename _Val, typename _KeyOfValue,
1991 typename _Compare, typename _Alloc>
1992 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1993 _Compare, _Alloc>::const_iterator
1994 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1995 _M_upper_bound(_Const_Link_type __x, _Const_Base_ptr __y,
1996 const _Key& __k) const
1997 {
1998 while (__x != 0)
1999 if (_M_impl._M_key_compare(__k, _S_key(__x)))
2000 __y = __x, __x = _S_left(__x);
2001 else
2002 __x = _S_right(__x);
2003 return const_iterator(__y);
2004 }
2005
2006 template<typename _Key, typename _Val, typename _KeyOfValue,
2007 typename _Compare, typename _Alloc>
2008 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2009 _Compare, _Alloc>::iterator,
2010 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2011 _Compare, _Alloc>::iterator>
2012 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2013 equal_range(const _Key& __k)
2014 {
2015 _Link_type __x = _M_begin();
2016 _Base_ptr __y = _M_end();
2017 while (__x != 0)
2018 {
2019 if (_M_impl._M_key_compare(_S_key(__x), __k))
2020 __x = _S_right(__x);
2021 else if (_M_impl._M_key_compare(__k, _S_key(__x)))
2022 __y = __x, __x = _S_left(__x);
2023 else
2024 {
2025 _Link_type __xu(__x);
2026 _Base_ptr __yu(__y);
2027 __y = __x, __x = _S_left(__x);
2028 __xu = _S_right(__xu);
2029 return pair<iterator,
2030 iterator>(_M_lower_bound(__x, __y, __k),
2031 _M_upper_bound(__xu, __yu, __k));
2032 }
2033 }
2034 return pair<iterator, iterator>(iterator(__y),
2035 iterator(__y));
2036 }
2037
2038 template<typename _Key, typename _Val, typename _KeyOfValue,
2039 typename _Compare, typename _Alloc>
2040 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2041 _Compare, _Alloc>::const_iterator,
2042 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2043 _Compare, _Alloc>::const_iterator>
2044 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2045 equal_range(const _Key& __k) const
2046 {
2047 _Const_Link_type __x = _M_begin();
2048 _Const_Base_ptr __y = _M_end();
2049 while (__x != 0)
2050 {
2051 if (_M_impl._M_key_compare(_S_key(__x), __k))
2052 __x = _S_right(__x);
2053 else if (_M_impl._M_key_compare(__k, _S_key(__x)))
2054 __y = __x, __x = _S_left(__x);
2055 else
2056 {
2057 _Const_Link_type __xu(__x);
2058 _Const_Base_ptr __yu(__y);
2059 __y = __x, __x = _S_left(__x);
2060 __xu = _S_right(__xu);
2061 return pair<const_iterator,
2062 const_iterator>(_M_lower_bound(__x, __y, __k),
2063 _M_upper_bound(__xu, __yu, __k));
2064 }
2065 }
2066 return pair<const_iterator, const_iterator>(const_iterator(__y),
2067 const_iterator(__y));
2068 }
2069
2070 template<typename _Key, typename _Val, typename _KeyOfValue,
2071 typename _Compare, typename _Alloc>
2072 void
2073 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2074 swap(_Rb_tree& __t)
2075 _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
2076 {
2077 if (_M_root() == 0)
2078 {
2079 if (__t._M_root() != 0)
2080 _M_impl._M_move_data(__t._M_impl);
2081 }
2082 else if (__t._M_root() == 0)
2083 __t._M_impl._M_move_data(_M_impl);
2084 else
2085 {
2086 std::swap(_M_root(),__t._M_root());
2087 std::swap(_M_leftmost(),__t._M_leftmost());
2088 std::swap(_M_rightmost(),__t._M_rightmost());
2089
2090 _M_root()->_M_parent = _M_end();
2091 __t._M_root()->_M_parent = __t._M_end();
2092 std::swap(this->_M_impl._M_node_count, __t._M_impl._M_node_count);
2093 }
2094 // No need to swap header's color as it does not change.
2095 std::swap(this->_M_impl._M_key_compare, __t._M_impl._M_key_compare);
2096
2097 _Alloc_traits::_S_on_swap(_M_get_Node_allocator(),
2098 __t._M_get_Node_allocator());
2099 }
2100
2101 template<typename _Key, typename _Val, typename _KeyOfValue,
2102 typename _Compare, typename _Alloc>
2103 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2104 _Compare, _Alloc>::_Base_ptr,
2105 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2106 _Compare, _Alloc>::_Base_ptr>
2107 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2108 _M_get_insert_unique_pos(const key_type& __k)
2109 {
2110 typedef pair<_Base_ptr, _Base_ptr> _Res;
2111 _Link_type __x = _M_begin();
2112 _Base_ptr __y = _M_end();
2113 bool __comp = true;
2114 while (__x != 0)
2115 {
2116 __y = __x;
2117 __comp = _M_impl._M_key_compare(__k, _S_key(__x));
2118 __x = __comp ? _S_left(__x) : _S_right(__x);
2119 }
2120 iterator __j = iterator(__y);
2121 if (__comp)
2122 {
2123 if (__j == begin())
2124 return _Res(__x, __y);
2125 else
2126 --__j;
2127 }
2128 if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
2129 return _Res(__x, __y);
2130 return _Res(__j._M_node, 0);
2131 }
2132
2133 template<typename _Key, typename _Val, typename _KeyOfValue,
2134 typename _Compare, typename _Alloc>
2135 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2136 _Compare, _Alloc>::_Base_ptr,
2137 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2138 _Compare, _Alloc>::_Base_ptr>
2139 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2140 _M_get_insert_equal_pos(const key_type& __k)
2141 {
2142 typedef pair<_Base_ptr, _Base_ptr> _Res;
2143 _Link_type __x = _M_begin();
2144 _Base_ptr __y = _M_end();
2145 while (__x != 0)
2146 {
2147 __y = __x;
2148 __x = _M_impl._M_key_compare(__k, _S_key(__x)) ?
2149 _S_left(__x) : _S_right(__x);
2150 }
2151 return _Res(__x, __y);
2152 }
2153
2154 template<typename _Key, typename _Val, typename _KeyOfValue,
2155 typename _Compare, typename _Alloc>
2156 #if __cplusplus >= 201103L
2157 template<typename _Arg>
2158 #endif
2159 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2160 _Compare, _Alloc>::iterator, bool>
2161 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2162 #if __cplusplus >= 201103L
2163 _M_insert_unique(_Arg&& __v)
2164 #else
2165 _M_insert_unique(const _Val& __v)
2166 #endif
2167 {
2168 typedef pair<iterator, bool> _Res;
2169 pair<_Base_ptr, _Base_ptr> __res
2170 = _M_get_insert_unique_pos(_KeyOfValue()(__v));
2171
2172 if (__res.second)
2173 {
2174 _Alloc_node __an(*this);
2175 return _Res(_M_insert_(__res.first, __res.second,
2176 _GLIBCXX_FORWARD(_Arg, __v), __an),
2177 true);
2178 }
2179
2180 return _Res(iterator(__res.first), false);
2181 }
2182
2183 template<typename _Key, typename _Val, typename _KeyOfValue,
2184 typename _Compare, typename _Alloc>
2185 #if __cplusplus >= 201103L
2186 template<typename _Arg>
2187 #endif
2188 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2189 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2190 #if __cplusplus >= 201103L
2191 _M_insert_equal(_Arg&& __v)
2192 #else
2193 _M_insert_equal(const _Val& __v)
2194 #endif
2195 {
2196 pair<_Base_ptr, _Base_ptr> __res
2197 = _M_get_insert_equal_pos(_KeyOfValue()(__v));
2198 _Alloc_node __an(*this);
2199 return _M_insert_(__res.first, __res.second,
2200 _GLIBCXX_FORWARD(_Arg, __v), __an);
2201 }
2202
2203 template<typename _Key, typename _Val, typename _KeyOfValue,
2204 typename _Compare, typename _Alloc>
2205 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2206 _Compare, _Alloc>::_Base_ptr,
2207 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2208 _Compare, _Alloc>::_Base_ptr>
2209 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2210 _M_get_insert_hint_unique_pos(const_iterator __position,
2211 const key_type& __k)
2212 {
2213 iterator __pos = __position._M_const_cast();
2214 typedef pair<_Base_ptr, _Base_ptr> _Res;
2215
2216 // end()
2217 if (__pos._M_node == _M_end())
2218 {
2219 if (size() > 0
2220 && _M_impl._M_key_compare(_S_key(_M_rightmost()), __k))
2221 return _Res(0, _M_rightmost());
2222 else
2223 return _M_get_insert_unique_pos(__k);
2224 }
2225 else if (_M_impl._M_key_compare(__k, _S_key(__pos._M_node)))
2226 {
2227 // First, try before...
2228 iterator __before = __pos;
2229 if (__pos._M_node == _M_leftmost()) // begin()
2230 return _Res(_M_leftmost(), _M_leftmost());
2231 else if (_M_impl._M_key_compare(_S_key((--__before)._M_node), __k))
2232 {
2233 if (_S_right(__before._M_node) == 0)
2234 return _Res(0, __before._M_node);
2235 else
2236 return _Res(__pos._M_node, __pos._M_node);
2237 }
2238 else
2239 return _M_get_insert_unique_pos(__k);
2240 }
2241 else if (_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2242 {
2243 // ... then try after.
2244 iterator __after = __pos;
2245 if (__pos._M_node == _M_rightmost())
2246 return _Res(0, _M_rightmost());
2247 else if (_M_impl._M_key_compare(__k, _S_key((++__after)._M_node)))
2248 {
2249 if (_S_right(__pos._M_node) == 0)
2250 return _Res(0, __pos._M_node);
2251 else
2252 return _Res(__after._M_node, __after._M_node);
2253 }
2254 else
2255 return _M_get_insert_unique_pos(__k);
2256 }
2257 else
2258 // Equivalent keys.
2259 return _Res(__pos._M_node, 0);
2260 }
2261
2262 template<typename _Key, typename _Val, typename _KeyOfValue,
2263 typename _Compare, typename _Alloc>
2264 #if __cplusplus >= 201103L
2265 template<typename _Arg, typename _NodeGen>
2266 #else
2267 template<typename _NodeGen>
2268 #endif
2269 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2270 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2271 _M_insert_unique_(const_iterator __position,
2272 #if __cplusplus >= 201103L
2273 _Arg&& __v,
2274 #else
2275 const _Val& __v,
2276 #endif
2277 _NodeGen& __node_gen)
2278 {
2279 pair<_Base_ptr, _Base_ptr> __res
2280 = _M_get_insert_hint_unique_pos(__position, _KeyOfValue()(__v));
2281
2282 if (__res.second)
2283 return _M_insert_(__res.first, __res.second,
2284 _GLIBCXX_FORWARD(_Arg, __v),
2285 __node_gen);
2286 return iterator(__res.first);
2287 }
2288
2289 template<typename _Key, typename _Val, typename _KeyOfValue,
2290 typename _Compare, typename _Alloc>
2291 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2292 _Compare, _Alloc>::_Base_ptr,
2293 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2294 _Compare, _Alloc>::_Base_ptr>
2295 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2296 _M_get_insert_hint_equal_pos(const_iterator __position, const key_type& __k)
2297 {
2298 iterator __pos = __position._M_const_cast();
2299 typedef pair<_Base_ptr, _Base_ptr> _Res;
2300
2301 // end()
2302 if (__pos._M_node == _M_end())
2303 {
2304 if (size() > 0
2305 && !_M_impl._M_key_compare(__k, _S_key(_M_rightmost())))
2306 return _Res(0, _M_rightmost());
2307 else
2308 return _M_get_insert_equal_pos(__k);
2309 }
2310 else if (!_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2311 {
2312 // First, try before...
2313 iterator __before = __pos;
2314 if (__pos._M_node == _M_leftmost()) // begin()
2315 return _Res(_M_leftmost(), _M_leftmost());
2316 else if (!_M_impl._M_key_compare(__k, _S_key((--__before)._M_node)))
2317 {
2318 if (_S_right(__before._M_node) == 0)
2319 return _Res(0, __before._M_node);
2320 else
2321 return _Res(__pos._M_node, __pos._M_node);
2322 }
2323 else
2324 return _M_get_insert_equal_pos(__k);
2325 }
2326 else
2327 {
2328 // ... then try after.
2329 iterator __after = __pos;
2330 if (__pos._M_node == _M_rightmost())
2331 return _Res(0, _M_rightmost());
2332 else if (!_M_impl._M_key_compare(_S_key((++__after)._M_node), __k))
2333 {
2334 if (_S_right(__pos._M_node) == 0)
2335 return _Res(0, __pos._M_node);
2336 else
2337 return _Res(__after._M_node, __after._M_node);
2338 }
2339 else
2340 return _Res(0, 0);
2341 }
2342 }
2343
2344 template<typename _Key, typename _Val, typename _KeyOfValue,
2345 typename _Compare, typename _Alloc>
2346 #if __cplusplus >= 201103L
2347 template<typename _Arg, typename _NodeGen>
2348 #else
2349 template<typename _NodeGen>
2350 #endif
2351 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2352 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2353 _M_insert_equal_(const_iterator __position,
2354 #if __cplusplus >= 201103L
2355 _Arg&& __v,
2356 #else
2357 const _Val& __v,
2358 #endif
2359 _NodeGen& __node_gen)
2360 {
2361 pair<_Base_ptr, _Base_ptr> __res
2362 = _M_get_insert_hint_equal_pos(__position, _KeyOfValue()(__v));
2363
2364 if (__res.second)
2365 return _M_insert_(__res.first, __res.second,
2366 _GLIBCXX_FORWARD(_Arg, __v),
2367 __node_gen);
2368
2369 return _M_insert_equal_lower(_GLIBCXX_FORWARD(_Arg, __v));
2370 }
2371
2372 #if __cplusplus >= 201103L
2373 template<typename _Key, typename _Val, typename _KeyOfValue,
2374 typename _Compare, typename _Alloc>
2375 auto
2376 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2377 _M_insert_node(_Base_ptr __x, _Base_ptr __p, _Link_type __z)
2378 -> iterator
2379 {
2380 bool __insert_left = (__x != 0 || __p == _M_end()
2381 || _M_impl._M_key_compare(_S_key(__z),
2382 _S_key(__p)));
2383
2384 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2385 this->_M_impl._M_header);
2386 ++_M_impl._M_node_count;
2387 return iterator(__z);
2388 }
2389
2390 template<typename _Key, typename _Val, typename _KeyOfValue,
2391 typename _Compare, typename _Alloc>
2392 auto
2393 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2394 _M_insert_lower_node(_Base_ptr __p, _Link_type __z)
2395 -> iterator
2396 {
2397 bool __insert_left = (__p == _M_end()
2398 || !_M_impl._M_key_compare(_S_key(__p),
2399 _S_key(__z)));
2400
2401 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2402 this->_M_impl._M_header);
2403 ++_M_impl._M_node_count;
2404 return iterator(__z);
2405 }
2406
2407 template<typename _Key, typename _Val, typename _KeyOfValue,
2408 typename _Compare, typename _Alloc>
2409 auto
2410 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2411 _M_insert_equal_lower_node(_Link_type __z)
2412 -> iterator
2413 {
2414 _Link_type __x = _M_begin();
2415 _Base_ptr __y = _M_end();
2416 while (__x != 0)
2417 {
2418 __y = __x;
2419 __x = !_M_impl._M_key_compare(_S_key(__x), _S_key(__z)) ?
2420 _S_left(__x) : _S_right(__x);
2421 }
2422 return _M_insert_lower_node(__y, __z);
2423 }
2424
2425 template<typename _Key, typename _Val, typename _KeyOfValue,
2426 typename _Compare, typename _Alloc>
2427 template<typename... _Args>
2428 auto
2429 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2430 _M_emplace_unique(_Args&&... __args)
2431 -> pair<iterator, bool>
2432 {
2433 _Auto_node __z(*this, std::forward<_Args>(__args)...);
2434 auto __res = _M_get_insert_unique_pos(__z._M_key());
2435 if (__res.second)
2436 return {__z._M_insert(__res), true};
2437 return {iterator(__res.first), false};
2438 }
2439
2440 template<typename _Key, typename _Val, typename _KeyOfValue,
2441 typename _Compare, typename _Alloc>
2442 template<typename... _Args>
2443 auto
2444 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2445 _M_emplace_equal(_Args&&... __args)
2446 -> iterator
2447 {
2448 _Auto_node __z(*this, std::forward<_Args>(__args)...);
2449 auto __res = _M_get_insert_equal_pos(__z._M_key());
2450 return __z._M_insert(__res);
2451 }
2452
2453 template<typename _Key, typename _Val, typename _KeyOfValue,
2454 typename _Compare, typename _Alloc>
2455 template<typename... _Args>
2456 auto
2457 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2458 _M_emplace_hint_unique(const_iterator __pos, _Args&&... __args)
2459 -> iterator
2460 {
2461 _Auto_node __z(*this, std::forward<_Args>(__args)...);
2462 auto __res = _M_get_insert_hint_unique_pos(__pos, __z._M_key());
2463 if (__res.second)
2464 return __z._M_insert(__res);
2465 return iterator(__res.first);
2466 }
2467
2468 template<typename _Key, typename _Val, typename _KeyOfValue,
2469 typename _Compare, typename _Alloc>
2470 template<typename... _Args>
2471 auto
2472 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2473 _M_emplace_hint_equal(const_iterator __pos, _Args&&... __args)
2474 -> iterator
2475 {
2476 _Auto_node __z(*this, std::forward<_Args>(__args)...);
2477 auto __res = _M_get_insert_hint_equal_pos(__pos, __z._M_key());
2478 if (__res.second)
2479 return __z._M_insert(__res);
2480 return __z._M_insert_equal_lower();
2481 }
2482 #endif
2483
2484
2485 template<typename _Key, typename _Val, typename _KeyOfValue,
2486 typename _Compare, typename _Alloc>
2487 void
2488 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2489 _M_erase_aux(const_iterator __position)
2490 {
2491 _Link_type __y =
2492 static_cast<_Link_type>(_Rb_tree_rebalance_for_erase
2493 (const_cast<_Base_ptr>(__position._M_node),
2494 this->_M_impl._M_header));
2495 _M_drop_node(__y);
2496 --_M_impl._M_node_count;
2497 }
2498
2499 template<typename _Key, typename _Val, typename _KeyOfValue,
2500 typename _Compare, typename _Alloc>
2501 void
2502 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2503 _M_erase_aux(const_iterator __first, const_iterator __last)
2504 {
2505 if (__first == begin() && __last == end())
2506 clear();
2507 else
2508 while (__first != __last)
2509 _M_erase_aux(__first++);
2510 }
2511
2512 template<typename _Key, typename _Val, typename _KeyOfValue,
2513 typename _Compare, typename _Alloc>
2514 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2515 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2516 erase(const _Key& __x)
2517 {
2518 pair<iterator, iterator> __p = equal_range(__x);
2519 const size_type __old_size = size();
2520 _M_erase_aux(__p.first, __p.second);
2521 return __old_size - size();
2522 }
2523
2524 template<typename _Key, typename _Val, typename _KeyOfValue,
2525 typename _Compare, typename _Alloc>
2526 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2527 _Compare, _Alloc>::iterator
2528 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2529 find(const _Key& __k)
2530 {
2531 iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2532 return (__j == end()
2533 || _M_impl._M_key_compare(__k,
2534 _S_key(__j._M_node))) ? end() : __j;
2535 }
2536
2537 template<typename _Key, typename _Val, typename _KeyOfValue,
2538 typename _Compare, typename _Alloc>
2539 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2540 _Compare, _Alloc>::const_iterator
2541 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2542 find(const _Key& __k) const
2543 {
2544 const_iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2545 return (__j == end()
2546 || _M_impl._M_key_compare(__k,
2547 _S_key(__j._M_node))) ? end() : __j;
2548 }
2549
2550 template<typename _Key, typename _Val, typename _KeyOfValue,
2551 typename _Compare, typename _Alloc>
2552 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2553 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2554 count(const _Key& __k) const
2555 {
2556 pair<const_iterator, const_iterator> __p = equal_range(__k);
2557 const size_type __n = std::distance(__p.first, __p.second);
2558 return __n;
2559 }
2560
2561 _GLIBCXX_PURE unsigned int
2562 _Rb_tree_black_count(const _Rb_tree_node_base* __node,
2563 const _Rb_tree_node_base* __root) throw ();
2564
2565 template<typename _Key, typename _Val, typename _KeyOfValue,
2566 typename _Compare, typename _Alloc>
2567 bool
2568 _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::__rb_verify() const
2569 {
2570 if (_M_impl._M_node_count == 0 || begin() == end())
2571 return _M_impl._M_node_count == 0 && begin() == end()
2572 && this->_M_impl._M_header._M_left == _M_end()
2573 && this->_M_impl._M_header._M_right == _M_end();
2574
2575 unsigned int __len = _Rb_tree_black_count(_M_leftmost(), _M_root());
2576 for (const_iterator __it = begin(); __it != end(); ++__it)
2577 {
2578 _Const_Link_type __x = static_cast<_Const_Link_type>(__it._M_node);
2579 _Const_Link_type __L = _S_left(__x);
2580 _Const_Link_type __R = _S_right(__x);
2581
2582 if (__x->_M_color == _S_red)
2583 if ((__L && __L->_M_color == _S_red)
2584 || (__R && __R->_M_color == _S_red))
2585 return false;
2586
2587 if (__L && _M_impl._M_key_compare(_S_key(__x), _S_key(__L)))
2588 return false;
2589 if (__R && _M_impl._M_key_compare(_S_key(__R), _S_key(__x)))
2590 return false;
2591
2592 if (!__L && !__R && _Rb_tree_black_count(__x, _M_root()) != __len)
2593 return false;
2594 }
2595
2596 if (_M_leftmost() != _Rb_tree_node_base::_S_minimum(_M_root()))
2597 return false;
2598 if (_M_rightmost() != _Rb_tree_node_base::_S_maximum(_M_root()))
2599 return false;
2600 return true;
2601 }
2602
2603 #if __cplusplus > 201402L
2604 // Allow access to internals of compatible _Rb_tree specializations.
2605 template<typename _Key, typename _Val, typename _Sel, typename _Cmp1,
2606 typename _Alloc, typename _Cmp2>
2607 struct _Rb_tree_merge_helper<_Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>,
2608 _Cmp2>
2609 {
2610 private:
2611 friend class _Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>;
2612
2613 static auto&
2614 _S_get_impl(_Rb_tree<_Key, _Val, _Sel, _Cmp2, _Alloc>& __tree)
2615 { return __tree._M_impl; }
2616 };
2617 #endif // C++17
2618
2619 _GLIBCXX_END_NAMESPACE_VERSION
2620 } // namespace
2621
2622 #endif
2623