source: Daodan/MSYS2/mingw32/include/c++/11.2.0/bits/stl_tree.h@ 1170

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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
75namespace 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 = typename conditional<_MoveValue,
641 value_type&&,
642 const value_type&>::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
1629 template<typename _Key, typename _Val, typename _KeyOfValue,
1630 typename _Compare, typename _Alloc>
1631 inline void
1632 swap(_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
1633 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __y)
1634 { __x.swap(__y); }
1635
1636#if __cplusplus >= 201103L
1637 template<typename _Key, typename _Val, typename _KeyOfValue,
1638 typename _Compare, typename _Alloc>
1639 void
1640 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1641 _M_move_data(_Rb_tree& __x, false_type)
1642 {
1643 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1644 _M_move_data(__x, true_type());
1645 else
1646 {
1647 _Alloc_node __an(*this);
1648 _M_root() =
1649 _M_copy<!__move_if_noexcept_cond<value_type>::value>(__x, __an);
1650 }
1651 }
1652
1653 template<typename _Key, typename _Val, typename _KeyOfValue,
1654 typename _Compare, typename _Alloc>
1655 inline void
1656 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1657 _M_move_assign(_Rb_tree& __x, true_type)
1658 {
1659 clear();
1660 if (__x._M_root() != nullptr)
1661 _M_move_data(__x, true_type());
1662 std::__alloc_on_move(_M_get_Node_allocator(),
1663 __x._M_get_Node_allocator());
1664 }
1665
1666 template<typename _Key, typename _Val, typename _KeyOfValue,
1667 typename _Compare, typename _Alloc>
1668 void
1669 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1670 _M_move_assign(_Rb_tree& __x, false_type)
1671 {
1672 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1673 return _M_move_assign(__x, true_type{});
1674
1675 // Try to move each node reusing existing nodes and copying __x nodes
1676 // structure.
1677 _Reuse_or_alloc_node __roan(*this);
1678 _M_impl._M_reset();
1679 if (__x._M_root() != nullptr)
1680 {
1681 _M_root() = _M_copy<__as_rvalue>(__x, __roan);
1682 __x.clear();
1683 }
1684 }
1685
1686 template<typename _Key, typename _Val, typename _KeyOfValue,
1687 typename _Compare, typename _Alloc>
1688 inline _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1689 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1690 operator=(_Rb_tree&& __x)
1691 noexcept(_Alloc_traits::_S_nothrow_move()
1692 && is_nothrow_move_assignable<_Compare>::value)
1693 {
1694 _M_impl._M_key_compare = std::move(__x._M_impl._M_key_compare);
1695 _M_move_assign(__x, __bool_constant<_Alloc_traits::_S_nothrow_move()>());
1696 return *this;
1697 }
1698
1699 template<typename _Key, typename _Val, typename _KeyOfValue,
1700 typename _Compare, typename _Alloc>
1701 template<typename _Iterator>
1702 void
1703 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1704 _M_assign_unique(_Iterator __first, _Iterator __last)
1705 {
1706 _Reuse_or_alloc_node __roan(*this);
1707 _M_impl._M_reset();
1708 for (; __first != __last; ++__first)
1709 _M_insert_unique_(end(), *__first, __roan);
1710 }
1711
1712 template<typename _Key, typename _Val, typename _KeyOfValue,
1713 typename _Compare, typename _Alloc>
1714 template<typename _Iterator>
1715 void
1716 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1717 _M_assign_equal(_Iterator __first, _Iterator __last)
1718 {
1719 _Reuse_or_alloc_node __roan(*this);
1720 _M_impl._M_reset();
1721 for (; __first != __last; ++__first)
1722 _M_insert_equal_(end(), *__first, __roan);
1723 }
1724#endif
1725
1726 template<typename _Key, typename _Val, typename _KeyOfValue,
1727 typename _Compare, typename _Alloc>
1728 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1729 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1730 operator=(const _Rb_tree& __x)
1731 {
1732 if (this != &__x)
1733 {
1734 // Note that _Key may be a constant type.
1735#if __cplusplus >= 201103L
1736 if (_Alloc_traits::_S_propagate_on_copy_assign())
1737 {
1738 auto& __this_alloc = this->_M_get_Node_allocator();
1739 auto& __that_alloc = __x._M_get_Node_allocator();
1740 if (!_Alloc_traits::_S_always_equal()
1741 && __this_alloc != __that_alloc)
1742 {
1743 // Replacement allocator cannot free existing storage, we need
1744 // to erase nodes first.
1745 clear();
1746 std::__alloc_on_copy(__this_alloc, __that_alloc);
1747 }
1748 }
1749#endif
1750
1751 _Reuse_or_alloc_node __roan(*this);
1752 _M_impl._M_reset();
1753 _M_impl._M_key_compare = __x._M_impl._M_key_compare;
1754 if (__x._M_root() != 0)
1755 _M_root() = _M_copy<__as_lvalue>(__x, __roan);
1756 }
1757
1758 return *this;
1759 }
1760
1761 template<typename _Key, typename _Val, typename _KeyOfValue,
1762 typename _Compare, typename _Alloc>
1763#if __cplusplus >= 201103L
1764 template<typename _Arg, typename _NodeGen>
1765#else
1766 template<typename _NodeGen>
1767#endif
1768 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1769 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1770 _M_insert_(_Base_ptr __x, _Base_ptr __p,
1771#if __cplusplus >= 201103L
1772 _Arg&& __v,
1773#else
1774 const _Val& __v,
1775#endif
1776 _NodeGen& __node_gen)
1777 {
1778 bool __insert_left = (__x != 0 || __p == _M_end()
1779 || _M_impl._M_key_compare(_KeyOfValue()(__v),
1780 _S_key(__p)));
1781
1782 _Link_type __z = __node_gen(_GLIBCXX_FORWARD(_Arg, __v));
1783
1784 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1785 this->_M_impl._M_header);
1786 ++_M_impl._M_node_count;
1787 return iterator(__z);
1788 }
1789
1790 template<typename _Key, typename _Val, typename _KeyOfValue,
1791 typename _Compare, typename _Alloc>
1792#if __cplusplus >= 201103L
1793 template<typename _Arg>
1794#endif
1795 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1796 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1797#if __cplusplus >= 201103L
1798 _M_insert_lower(_Base_ptr __p, _Arg&& __v)
1799#else
1800 _M_insert_lower(_Base_ptr __p, const _Val& __v)
1801#endif
1802 {
1803 bool __insert_left = (__p == _M_end()
1804 || !_M_impl._M_key_compare(_S_key(__p),
1805 _KeyOfValue()(__v)));
1806
1807 _Link_type __z = _M_create_node(_GLIBCXX_FORWARD(_Arg, __v));
1808
1809 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1810 this->_M_impl._M_header);
1811 ++_M_impl._M_node_count;
1812 return iterator(__z);
1813 }
1814
1815 template<typename _Key, typename _Val, typename _KeyOfValue,
1816 typename _Compare, typename _Alloc>
1817#if __cplusplus >= 201103L
1818 template<typename _Arg>
1819#endif
1820 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1821 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1822#if __cplusplus >= 201103L
1823 _M_insert_equal_lower(_Arg&& __v)
1824#else
1825 _M_insert_equal_lower(const _Val& __v)
1826#endif
1827 {
1828 _Link_type __x = _M_begin();
1829 _Base_ptr __y = _M_end();
1830 while (__x != 0)
1831 {
1832 __y = __x;
1833 __x = !_M_impl._M_key_compare(_S_key(__x), _KeyOfValue()(__v)) ?
1834 _S_left(__x) : _S_right(__x);
1835 }
1836 return _M_insert_lower(__y, _GLIBCXX_FORWARD(_Arg, __v));
1837 }
1838
1839 template<typename _Key, typename _Val, typename _KoV,
1840 typename _Compare, typename _Alloc>
1841 template<bool _MoveValues, typename _NodeGen>
1842 typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::_Link_type
1843 _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::
1844 _M_copy(_Link_type __x, _Base_ptr __p, _NodeGen& __node_gen)
1845 {
1846 // Structural copy. __x and __p must be non-null.
1847 _Link_type __top = _M_clone_node<_MoveValues>(__x, __node_gen);
1848 __top->_M_parent = __p;
1849
1850 __try
1851 {
1852 if (__x->_M_right)
1853 __top->_M_right =
1854 _M_copy<_MoveValues>(_S_right(__x), __top, __node_gen);
1855 __p = __top;
1856 __x = _S_left(__x);
1857
1858 while (__x != 0)
1859 {
1860 _Link_type __y = _M_clone_node<_MoveValues>(__x, __node_gen);
1861 __p->_M_left = __y;
1862 __y->_M_parent = __p;
1863 if (__x->_M_right)
1864 __y->_M_right = _M_copy<_MoveValues>(_S_right(__x),
1865 __y, __node_gen);
1866 __p = __y;
1867 __x = _S_left(__x);
1868 }
1869 }
1870 __catch(...)
1871 {
1872 _M_erase(__top);
1873 __throw_exception_again;
1874 }
1875 return __top;
1876 }
1877
1878 template<typename _Key, typename _Val, typename _KeyOfValue,
1879 typename _Compare, typename _Alloc>
1880 void
1881 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1882 _M_erase(_Link_type __x)
1883 {
1884 // Erase without rebalancing.
1885 while (__x != 0)
1886 {
1887 _M_erase(_S_right(__x));
1888 _Link_type __y = _S_left(__x);
1889 _M_drop_node(__x);
1890 __x = __y;
1891 }
1892 }
1893
1894 template<typename _Key, typename _Val, typename _KeyOfValue,
1895 typename _Compare, typename _Alloc>
1896 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1897 _Compare, _Alloc>::iterator
1898 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1899 _M_lower_bound(_Link_type __x, _Base_ptr __y,
1900 const _Key& __k)
1901 {
1902 while (__x != 0)
1903 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1904 __y = __x, __x = _S_left(__x);
1905 else
1906 __x = _S_right(__x);
1907 return iterator(__y);
1908 }
1909
1910 template<typename _Key, typename _Val, typename _KeyOfValue,
1911 typename _Compare, typename _Alloc>
1912 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1913 _Compare, _Alloc>::const_iterator
1914 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1915 _M_lower_bound(_Const_Link_type __x, _Const_Base_ptr __y,
1916 const _Key& __k) const
1917 {
1918 while (__x != 0)
1919 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1920 __y = __x, __x = _S_left(__x);
1921 else
1922 __x = _S_right(__x);
1923 return const_iterator(__y);
1924 }
1925
1926 template<typename _Key, typename _Val, typename _KeyOfValue,
1927 typename _Compare, typename _Alloc>
1928 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1929 _Compare, _Alloc>::iterator
1930 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1931 _M_upper_bound(_Link_type __x, _Base_ptr __y,
1932 const _Key& __k)
1933 {
1934 while (__x != 0)
1935 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1936 __y = __x, __x = _S_left(__x);
1937 else
1938 __x = _S_right(__x);
1939 return iterator(__y);
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>::const_iterator
1946 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1947 _M_upper_bound(_Const_Link_type __x, _Const_Base_ptr __y,
1948 const _Key& __k) const
1949 {
1950 while (__x != 0)
1951 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1952 __y = __x, __x = _S_left(__x);
1953 else
1954 __x = _S_right(__x);
1955 return const_iterator(__y);
1956 }
1957
1958 template<typename _Key, typename _Val, typename _KeyOfValue,
1959 typename _Compare, typename _Alloc>
1960 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
1961 _Compare, _Alloc>::iterator,
1962 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1963 _Compare, _Alloc>::iterator>
1964 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1965 equal_range(const _Key& __k)
1966 {
1967 _Link_type __x = _M_begin();
1968 _Base_ptr __y = _M_end();
1969 while (__x != 0)
1970 {
1971 if (_M_impl._M_key_compare(_S_key(__x), __k))
1972 __x = _S_right(__x);
1973 else if (_M_impl._M_key_compare(__k, _S_key(__x)))
1974 __y = __x, __x = _S_left(__x);
1975 else
1976 {
1977 _Link_type __xu(__x);
1978 _Base_ptr __yu(__y);
1979 __y = __x, __x = _S_left(__x);
1980 __xu = _S_right(__xu);
1981 return pair<iterator,
1982 iterator>(_M_lower_bound(__x, __y, __k),
1983 _M_upper_bound(__xu, __yu, __k));
1984 }
1985 }
1986 return pair<iterator, iterator>(iterator(__y),
1987 iterator(__y));
1988 }
1989
1990 template<typename _Key, typename _Val, typename _KeyOfValue,
1991 typename _Compare, typename _Alloc>
1992 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
1993 _Compare, _Alloc>::const_iterator,
1994 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1995 _Compare, _Alloc>::const_iterator>
1996 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1997 equal_range(const _Key& __k) const
1998 {
1999 _Const_Link_type __x = _M_begin();
2000 _Const_Base_ptr __y = _M_end();
2001 while (__x != 0)
2002 {
2003 if (_M_impl._M_key_compare(_S_key(__x), __k))
2004 __x = _S_right(__x);
2005 else if (_M_impl._M_key_compare(__k, _S_key(__x)))
2006 __y = __x, __x = _S_left(__x);
2007 else
2008 {
2009 _Const_Link_type __xu(__x);
2010 _Const_Base_ptr __yu(__y);
2011 __y = __x, __x = _S_left(__x);
2012 __xu = _S_right(__xu);
2013 return pair<const_iterator,
2014 const_iterator>(_M_lower_bound(__x, __y, __k),
2015 _M_upper_bound(__xu, __yu, __k));
2016 }
2017 }
2018 return pair<const_iterator, const_iterator>(const_iterator(__y),
2019 const_iterator(__y));
2020 }
2021
2022 template<typename _Key, typename _Val, typename _KeyOfValue,
2023 typename _Compare, typename _Alloc>
2024 void
2025 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2026 swap(_Rb_tree& __t)
2027 _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
2028 {
2029 if (_M_root() == 0)
2030 {
2031 if (__t._M_root() != 0)
2032 _M_impl._M_move_data(__t._M_impl);
2033 }
2034 else if (__t._M_root() == 0)
2035 __t._M_impl._M_move_data(_M_impl);
2036 else
2037 {
2038 std::swap(_M_root(),__t._M_root());
2039 std::swap(_M_leftmost(),__t._M_leftmost());
2040 std::swap(_M_rightmost(),__t._M_rightmost());
2041
2042 _M_root()->_M_parent = _M_end();
2043 __t._M_root()->_M_parent = __t._M_end();
2044 std::swap(this->_M_impl._M_node_count, __t._M_impl._M_node_count);
2045 }
2046 // No need to swap header's color as it does not change.
2047 std::swap(this->_M_impl._M_key_compare, __t._M_impl._M_key_compare);
2048
2049 _Alloc_traits::_S_on_swap(_M_get_Node_allocator(),
2050 __t._M_get_Node_allocator());
2051 }
2052
2053 template<typename _Key, typename _Val, typename _KeyOfValue,
2054 typename _Compare, typename _Alloc>
2055 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2056 _Compare, _Alloc>::_Base_ptr,
2057 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2058 _Compare, _Alloc>::_Base_ptr>
2059 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2060 _M_get_insert_unique_pos(const key_type& __k)
2061 {
2062 typedef pair<_Base_ptr, _Base_ptr> _Res;
2063 _Link_type __x = _M_begin();
2064 _Base_ptr __y = _M_end();
2065 bool __comp = true;
2066 while (__x != 0)
2067 {
2068 __y = __x;
2069 __comp = _M_impl._M_key_compare(__k, _S_key(__x));
2070 __x = __comp ? _S_left(__x) : _S_right(__x);
2071 }
2072 iterator __j = iterator(__y);
2073 if (__comp)
2074 {
2075 if (__j == begin())
2076 return _Res(__x, __y);
2077 else
2078 --__j;
2079 }
2080 if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
2081 return _Res(__x, __y);
2082 return _Res(__j._M_node, 0);
2083 }
2084
2085 template<typename _Key, typename _Val, typename _KeyOfValue,
2086 typename _Compare, typename _Alloc>
2087 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2088 _Compare, _Alloc>::_Base_ptr,
2089 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2090 _Compare, _Alloc>::_Base_ptr>
2091 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2092 _M_get_insert_equal_pos(const key_type& __k)
2093 {
2094 typedef pair<_Base_ptr, _Base_ptr> _Res;
2095 _Link_type __x = _M_begin();
2096 _Base_ptr __y = _M_end();
2097 while (__x != 0)
2098 {
2099 __y = __x;
2100 __x = _M_impl._M_key_compare(__k, _S_key(__x)) ?
2101 _S_left(__x) : _S_right(__x);
2102 }
2103 return _Res(__x, __y);
2104 }
2105
2106 template<typename _Key, typename _Val, typename _KeyOfValue,
2107 typename _Compare, typename _Alloc>
2108#if __cplusplus >= 201103L
2109 template<typename _Arg>
2110#endif
2111 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2112 _Compare, _Alloc>::iterator, bool>
2113 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2114#if __cplusplus >= 201103L
2115 _M_insert_unique(_Arg&& __v)
2116#else
2117 _M_insert_unique(const _Val& __v)
2118#endif
2119 {
2120 typedef pair<iterator, bool> _Res;
2121 pair<_Base_ptr, _Base_ptr> __res
2122 = _M_get_insert_unique_pos(_KeyOfValue()(__v));
2123
2124 if (__res.second)
2125 {
2126 _Alloc_node __an(*this);
2127 return _Res(_M_insert_(__res.first, __res.second,
2128 _GLIBCXX_FORWARD(_Arg, __v), __an),
2129 true);
2130 }
2131
2132 return _Res(iterator(__res.first), false);
2133 }
2134
2135 template<typename _Key, typename _Val, typename _KeyOfValue,
2136 typename _Compare, typename _Alloc>
2137#if __cplusplus >= 201103L
2138 template<typename _Arg>
2139#endif
2140 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2141 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2142#if __cplusplus >= 201103L
2143 _M_insert_equal(_Arg&& __v)
2144#else
2145 _M_insert_equal(const _Val& __v)
2146#endif
2147 {
2148 pair<_Base_ptr, _Base_ptr> __res
2149 = _M_get_insert_equal_pos(_KeyOfValue()(__v));
2150 _Alloc_node __an(*this);
2151 return _M_insert_(__res.first, __res.second,
2152 _GLIBCXX_FORWARD(_Arg, __v), __an);
2153 }
2154
2155 template<typename _Key, typename _Val, typename _KeyOfValue,
2156 typename _Compare, typename _Alloc>
2157 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2158 _Compare, _Alloc>::_Base_ptr,
2159 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2160 _Compare, _Alloc>::_Base_ptr>
2161 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2162 _M_get_insert_hint_unique_pos(const_iterator __position,
2163 const key_type& __k)
2164 {
2165 iterator __pos = __position._M_const_cast();
2166 typedef pair<_Base_ptr, _Base_ptr> _Res;
2167
2168 // end()
2169 if (__pos._M_node == _M_end())
2170 {
2171 if (size() > 0
2172 && _M_impl._M_key_compare(_S_key(_M_rightmost()), __k))
2173 return _Res(0, _M_rightmost());
2174 else
2175 return _M_get_insert_unique_pos(__k);
2176 }
2177 else if (_M_impl._M_key_compare(__k, _S_key(__pos._M_node)))
2178 {
2179 // First, try before...
2180 iterator __before = __pos;
2181 if (__pos._M_node == _M_leftmost()) // begin()
2182 return _Res(_M_leftmost(), _M_leftmost());
2183 else if (_M_impl._M_key_compare(_S_key((--__before)._M_node), __k))
2184 {
2185 if (_S_right(__before._M_node) == 0)
2186 return _Res(0, __before._M_node);
2187 else
2188 return _Res(__pos._M_node, __pos._M_node);
2189 }
2190 else
2191 return _M_get_insert_unique_pos(__k);
2192 }
2193 else if (_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2194 {
2195 // ... then try after.
2196 iterator __after = __pos;
2197 if (__pos._M_node == _M_rightmost())
2198 return _Res(0, _M_rightmost());
2199 else if (_M_impl._M_key_compare(__k, _S_key((++__after)._M_node)))
2200 {
2201 if (_S_right(__pos._M_node) == 0)
2202 return _Res(0, __pos._M_node);
2203 else
2204 return _Res(__after._M_node, __after._M_node);
2205 }
2206 else
2207 return _M_get_insert_unique_pos(__k);
2208 }
2209 else
2210 // Equivalent keys.
2211 return _Res(__pos._M_node, 0);
2212 }
2213
2214 template<typename _Key, typename _Val, typename _KeyOfValue,
2215 typename _Compare, typename _Alloc>
2216#if __cplusplus >= 201103L
2217 template<typename _Arg, typename _NodeGen>
2218#else
2219 template<typename _NodeGen>
2220#endif
2221 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2222 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2223 _M_insert_unique_(const_iterator __position,
2224#if __cplusplus >= 201103L
2225 _Arg&& __v,
2226#else
2227 const _Val& __v,
2228#endif
2229 _NodeGen& __node_gen)
2230 {
2231 pair<_Base_ptr, _Base_ptr> __res
2232 = _M_get_insert_hint_unique_pos(__position, _KeyOfValue()(__v));
2233
2234 if (__res.second)
2235 return _M_insert_(__res.first, __res.second,
2236 _GLIBCXX_FORWARD(_Arg, __v),
2237 __node_gen);
2238 return iterator(__res.first);
2239 }
2240
2241 template<typename _Key, typename _Val, typename _KeyOfValue,
2242 typename _Compare, typename _Alloc>
2243 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2244 _Compare, _Alloc>::_Base_ptr,
2245 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2246 _Compare, _Alloc>::_Base_ptr>
2247 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2248 _M_get_insert_hint_equal_pos(const_iterator __position, const key_type& __k)
2249 {
2250 iterator __pos = __position._M_const_cast();
2251 typedef pair<_Base_ptr, _Base_ptr> _Res;
2252
2253 // end()
2254 if (__pos._M_node == _M_end())
2255 {
2256 if (size() > 0
2257 && !_M_impl._M_key_compare(__k, _S_key(_M_rightmost())))
2258 return _Res(0, _M_rightmost());
2259 else
2260 return _M_get_insert_equal_pos(__k);
2261 }
2262 else if (!_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2263 {
2264 // First, try before...
2265 iterator __before = __pos;
2266 if (__pos._M_node == _M_leftmost()) // begin()
2267 return _Res(_M_leftmost(), _M_leftmost());
2268 else if (!_M_impl._M_key_compare(__k, _S_key((--__before)._M_node)))
2269 {
2270 if (_S_right(__before._M_node) == 0)
2271 return _Res(0, __before._M_node);
2272 else
2273 return _Res(__pos._M_node, __pos._M_node);
2274 }
2275 else
2276 return _M_get_insert_equal_pos(__k);
2277 }
2278 else
2279 {
2280 // ... then try after.
2281 iterator __after = __pos;
2282 if (__pos._M_node == _M_rightmost())
2283 return _Res(0, _M_rightmost());
2284 else if (!_M_impl._M_key_compare(_S_key((++__after)._M_node), __k))
2285 {
2286 if (_S_right(__pos._M_node) == 0)
2287 return _Res(0, __pos._M_node);
2288 else
2289 return _Res(__after._M_node, __after._M_node);
2290 }
2291 else
2292 return _Res(0, 0);
2293 }
2294 }
2295
2296 template<typename _Key, typename _Val, typename _KeyOfValue,
2297 typename _Compare, typename _Alloc>
2298#if __cplusplus >= 201103L
2299 template<typename _Arg, typename _NodeGen>
2300#else
2301 template<typename _NodeGen>
2302#endif
2303 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2304 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2305 _M_insert_equal_(const_iterator __position,
2306#if __cplusplus >= 201103L
2307 _Arg&& __v,
2308#else
2309 const _Val& __v,
2310#endif
2311 _NodeGen& __node_gen)
2312 {
2313 pair<_Base_ptr, _Base_ptr> __res
2314 = _M_get_insert_hint_equal_pos(__position, _KeyOfValue()(__v));
2315
2316 if (__res.second)
2317 return _M_insert_(__res.first, __res.second,
2318 _GLIBCXX_FORWARD(_Arg, __v),
2319 __node_gen);
2320
2321 return _M_insert_equal_lower(_GLIBCXX_FORWARD(_Arg, __v));
2322 }
2323
2324#if __cplusplus >= 201103L
2325 template<typename _Key, typename _Val, typename _KeyOfValue,
2326 typename _Compare, typename _Alloc>
2327 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2328 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2329 _M_insert_node(_Base_ptr __x, _Base_ptr __p, _Link_type __z)
2330 {
2331 bool __insert_left = (__x != 0 || __p == _M_end()
2332 || _M_impl._M_key_compare(_S_key(__z),
2333 _S_key(__p)));
2334
2335 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2336 this->_M_impl._M_header);
2337 ++_M_impl._M_node_count;
2338 return iterator(__z);
2339 }
2340
2341 template<typename _Key, typename _Val, typename _KeyOfValue,
2342 typename _Compare, typename _Alloc>
2343 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2344 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2345 _M_insert_lower_node(_Base_ptr __p, _Link_type __z)
2346 {
2347 bool __insert_left = (__p == _M_end()
2348 || !_M_impl._M_key_compare(_S_key(__p),
2349 _S_key(__z)));
2350
2351 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2352 this->_M_impl._M_header);
2353 ++_M_impl._M_node_count;
2354 return iterator(__z);
2355 }
2356
2357 template<typename _Key, typename _Val, typename _KeyOfValue,
2358 typename _Compare, typename _Alloc>
2359 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2360 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2361 _M_insert_equal_lower_node(_Link_type __z)
2362 {
2363 _Link_type __x = _M_begin();
2364 _Base_ptr __y = _M_end();
2365 while (__x != 0)
2366 {
2367 __y = __x;
2368 __x = !_M_impl._M_key_compare(_S_key(__x), _S_key(__z)) ?
2369 _S_left(__x) : _S_right(__x);
2370 }
2371 return _M_insert_lower_node(__y, __z);
2372 }
2373
2374 template<typename _Key, typename _Val, typename _KeyOfValue,
2375 typename _Compare, typename _Alloc>
2376 template<typename... _Args>
2377 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2378 _Compare, _Alloc>::iterator, bool>
2379 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2380 _M_emplace_unique(_Args&&... __args)
2381 {
2382 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2383
2384 __try
2385 {
2386 typedef pair<iterator, bool> _Res;
2387 auto __res = _M_get_insert_unique_pos(_S_key(__z));
2388 if (__res.second)
2389 return _Res(_M_insert_node(__res.first, __res.second, __z), true);
2390
2391 _M_drop_node(__z);
2392 return _Res(iterator(__res.first), false);
2393 }
2394 __catch(...)
2395 {
2396 _M_drop_node(__z);
2397 __throw_exception_again;
2398 }
2399 }
2400
2401 template<typename _Key, typename _Val, typename _KeyOfValue,
2402 typename _Compare, typename _Alloc>
2403 template<typename... _Args>
2404 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2405 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2406 _M_emplace_equal(_Args&&... __args)
2407 {
2408 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2409
2410 __try
2411 {
2412 auto __res = _M_get_insert_equal_pos(_S_key(__z));
2413 return _M_insert_node(__res.first, __res.second, __z);
2414 }
2415 __catch(...)
2416 {
2417 _M_drop_node(__z);
2418 __throw_exception_again;
2419 }
2420 }
2421
2422 template<typename _Key, typename _Val, typename _KeyOfValue,
2423 typename _Compare, typename _Alloc>
2424 template<typename... _Args>
2425 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2426 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2427 _M_emplace_hint_unique(const_iterator __pos, _Args&&... __args)
2428 {
2429 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2430
2431 __try
2432 {
2433 auto __res = _M_get_insert_hint_unique_pos(__pos, _S_key(__z));
2434
2435 if (__res.second)
2436 return _M_insert_node(__res.first, __res.second, __z);
2437
2438 _M_drop_node(__z);
2439 return iterator(__res.first);
2440 }
2441 __catch(...)
2442 {
2443 _M_drop_node(__z);
2444 __throw_exception_again;
2445 }
2446 }
2447
2448 template<typename _Key, typename _Val, typename _KeyOfValue,
2449 typename _Compare, typename _Alloc>
2450 template<typename... _Args>
2451 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2452 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2453 _M_emplace_hint_equal(const_iterator __pos, _Args&&... __args)
2454 {
2455 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2456
2457 __try
2458 {
2459 auto __res = _M_get_insert_hint_equal_pos(__pos, _S_key(__z));
2460
2461 if (__res.second)
2462 return _M_insert_node(__res.first, __res.second, __z);
2463
2464 return _M_insert_equal_lower_node(__z);
2465 }
2466 __catch(...)
2467 {
2468 _M_drop_node(__z);
2469 __throw_exception_again;
2470 }
2471 }
2472#endif
2473
2474
2475 template<typename _Key, typename _Val, typename _KeyOfValue,
2476 typename _Compare, typename _Alloc>
2477 void
2478 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2479 _M_erase_aux(const_iterator __position)
2480 {
2481 _Link_type __y =
2482 static_cast<_Link_type>(_Rb_tree_rebalance_for_erase
2483 (const_cast<_Base_ptr>(__position._M_node),
2484 this->_M_impl._M_header));
2485 _M_drop_node(__y);
2486 --_M_impl._M_node_count;
2487 }
2488
2489 template<typename _Key, typename _Val, typename _KeyOfValue,
2490 typename _Compare, typename _Alloc>
2491 void
2492 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2493 _M_erase_aux(const_iterator __first, const_iterator __last)
2494 {
2495 if (__first == begin() && __last == end())
2496 clear();
2497 else
2498 while (__first != __last)
2499 _M_erase_aux(__first++);
2500 }
2501
2502 template<typename _Key, typename _Val, typename _KeyOfValue,
2503 typename _Compare, typename _Alloc>
2504 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2505 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2506 erase(const _Key& __x)
2507 {
2508 pair<iterator, iterator> __p = equal_range(__x);
2509 const size_type __old_size = size();
2510 _M_erase_aux(__p.first, __p.second);
2511 return __old_size - size();
2512 }
2513
2514 template<typename _Key, typename _Val, typename _KeyOfValue,
2515 typename _Compare, typename _Alloc>
2516 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2517 _Compare, _Alloc>::iterator
2518 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2519 find(const _Key& __k)
2520 {
2521 iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2522 return (__j == end()
2523 || _M_impl._M_key_compare(__k,
2524 _S_key(__j._M_node))) ? end() : __j;
2525 }
2526
2527 template<typename _Key, typename _Val, typename _KeyOfValue,
2528 typename _Compare, typename _Alloc>
2529 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2530 _Compare, _Alloc>::const_iterator
2531 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2532 find(const _Key& __k) const
2533 {
2534 const_iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2535 return (__j == end()
2536 || _M_impl._M_key_compare(__k,
2537 _S_key(__j._M_node))) ? end() : __j;
2538 }
2539
2540 template<typename _Key, typename _Val, typename _KeyOfValue,
2541 typename _Compare, typename _Alloc>
2542 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2543 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2544 count(const _Key& __k) const
2545 {
2546 pair<const_iterator, const_iterator> __p = equal_range(__k);
2547 const size_type __n = std::distance(__p.first, __p.second);
2548 return __n;
2549 }
2550
2551 _GLIBCXX_PURE unsigned int
2552 _Rb_tree_black_count(const _Rb_tree_node_base* __node,
2553 const _Rb_tree_node_base* __root) throw ();
2554
2555 template<typename _Key, typename _Val, typename _KeyOfValue,
2556 typename _Compare, typename _Alloc>
2557 bool
2558 _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::__rb_verify() const
2559 {
2560 if (_M_impl._M_node_count == 0 || begin() == end())
2561 return _M_impl._M_node_count == 0 && begin() == end()
2562 && this->_M_impl._M_header._M_left == _M_end()
2563 && this->_M_impl._M_header._M_right == _M_end();
2564
2565 unsigned int __len = _Rb_tree_black_count(_M_leftmost(), _M_root());
2566 for (const_iterator __it = begin(); __it != end(); ++__it)
2567 {
2568 _Const_Link_type __x = static_cast<_Const_Link_type>(__it._M_node);
2569 _Const_Link_type __L = _S_left(__x);
2570 _Const_Link_type __R = _S_right(__x);
2571
2572 if (__x->_M_color == _S_red)
2573 if ((__L && __L->_M_color == _S_red)
2574 || (__R && __R->_M_color == _S_red))
2575 return false;
2576
2577 if (__L && _M_impl._M_key_compare(_S_key(__x), _S_key(__L)))
2578 return false;
2579 if (__R && _M_impl._M_key_compare(_S_key(__R), _S_key(__x)))
2580 return false;
2581
2582 if (!__L && !__R && _Rb_tree_black_count(__x, _M_root()) != __len)
2583 return false;
2584 }
2585
2586 if (_M_leftmost() != _Rb_tree_node_base::_S_minimum(_M_root()))
2587 return false;
2588 if (_M_rightmost() != _Rb_tree_node_base::_S_maximum(_M_root()))
2589 return false;
2590 return true;
2591 }
2592
2593#if __cplusplus > 201402L
2594 // Allow access to internals of compatible _Rb_tree specializations.
2595 template<typename _Key, typename _Val, typename _Sel, typename _Cmp1,
2596 typename _Alloc, typename _Cmp2>
2597 struct _Rb_tree_merge_helper<_Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>,
2598 _Cmp2>
2599 {
2600 private:
2601 friend class _Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>;
2602
2603 static auto&
2604 _S_get_impl(_Rb_tree<_Key, _Val, _Sel, _Cmp2, _Alloc>& __tree)
2605 { return __tree._M_impl; }
2606 };
2607#endif // C++17
2608
2609_GLIBCXX_END_NAMESPACE_VERSION
2610} // namespace
2611
2612#endif
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