1 // RB tree implementation -*- C++ -*-
2
3 // Copyright (C) 2001-2020 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 _Cmp, typename _SfinaeType, typename = __void_t<>>
420 struct __has_is_transparent
421 { };
422
423 template<typename _Cmp, typename _SfinaeType>
424 struct __has_is_transparent<_Cmp, _SfinaeType,
425 __void_t<typename _Cmp::is_transparent>>
426 { typedef void type; };
427
428 template<typename _Cmp, typename _SfinaeType>
429 using __has_is_transparent_t
430 = typename __has_is_transparent<_Cmp, _SfinaeType>::type;
431 #endif
432
433 #if __cplusplus > 201402L
434 template<typename _Tree1, typename _Cmp2>
435 struct _Rb_tree_merge_helper { };
436 #endif
437
438 template<typename _Key, typename _Val, typename _KeyOfValue,
439 typename _Compare, typename _Alloc = allocator<_Val> >
440 class _Rb_tree
441 {
442 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
443 rebind<_Rb_tree_node<_Val> >::other _Node_allocator;
444
445 typedef __gnu_cxx::__alloc_traits<_Node_allocator> _Alloc_traits;
446
447 protected:
448 typedef _Rb_tree_node_base* _Base_ptr;
449 typedef const _Rb_tree_node_base* _Const_Base_ptr;
450 typedef _Rb_tree_node<_Val>* _Link_type;
451 typedef const _Rb_tree_node<_Val>* _Const_Link_type;
452
453 private:
454 // Functor recycling a pool of nodes and using allocation once the pool
455 // is empty.
456 struct _Reuse_or_alloc_node
457 {
458 _Reuse_or_alloc_node(_Rb_tree& __t)
459 : _M_root(__t._M_root()), _M_nodes(__t._M_rightmost()), _M_t(__t)
460 {
461 if (_M_root)
462 {
463 _M_root->_M_parent = 0;
464
465 if (_M_nodes->_M_left)
466 _M_nodes = _M_nodes->_M_left;
467 }
468 else
469 _M_nodes = 0;
470 }
471
472 #if __cplusplus >= 201103L
473 _Reuse_or_alloc_node(const _Reuse_or_alloc_node&) = delete;
474 #endif
475
476 ~_Reuse_or_alloc_node()
477 { _M_t._M_erase(static_cast<_Link_type>(_M_root)); }
478
479 template<typename _Arg>
480 _Link_type
481 #if __cplusplus < 201103L
482 operator()(const _Arg& __arg)
483 #else
484 operator()(_Arg&& __arg)
485 #endif
486 {
487 _Link_type __node = static_cast<_Link_type>(_M_extract());
488 if (__node)
489 {
490 _M_t._M_destroy_node(__node);
491 _M_t._M_construct_node(__node, _GLIBCXX_FORWARD(_Arg, __arg));
492 return __node;
493 }
494
495 return _M_t._M_create_node(_GLIBCXX_FORWARD(_Arg, __arg));
496 }
497
498 private:
499 _Base_ptr
500 _M_extract()
501 {
502 if (!_M_nodes)
503 return _M_nodes;
504
505 _Base_ptr __node = _M_nodes;
506 _M_nodes = _M_nodes->_M_parent;
507 if (_M_nodes)
508 {
509 if (_M_nodes->_M_right == __node)
510 {
511 _M_nodes->_M_right = 0;
512
513 if (_M_nodes->_M_left)
514 {
515 _M_nodes = _M_nodes->_M_left;
516
517 while (_M_nodes->_M_right)
518 _M_nodes = _M_nodes->_M_right;
519
520 if (_M_nodes->_M_left)
521 _M_nodes = _M_nodes->_M_left;
522 }
523 }
524 else // __node is on the left.
525 _M_nodes->_M_left = 0;
526 }
527 else
528 _M_root = 0;
529
530 return __node;
531 }
532
533 _Base_ptr _M_root;
534 _Base_ptr _M_nodes;
535 _Rb_tree& _M_t;
536 };
537
538 // Functor similar to the previous one but without any pool of nodes to
539 // recycle.
540 struct _Alloc_node
541 {
542 _Alloc_node(_Rb_tree& __t)
543 : _M_t(__t) { }
544
545 template<typename _Arg>
546 _Link_type
547 #if __cplusplus < 201103L
548 operator()(const _Arg& __arg) const
549 #else
550 operator()(_Arg&& __arg) const
551 #endif
552 { return _M_t._M_create_node(_GLIBCXX_FORWARD(_Arg, __arg)); }
553
554 private:
555 _Rb_tree& _M_t;
556 };
557
558 public:
559 typedef _Key key_type;
560 typedef _Val value_type;
561 typedef value_type* pointer;
562 typedef const value_type* const_pointer;
563 typedef value_type& reference;
564 typedef const value_type& const_reference;
565 typedef size_t size_type;
566 typedef ptrdiff_t difference_type;
567 typedef _Alloc allocator_type;
568
569 _Node_allocator&
570 _M_get_Node_allocator() _GLIBCXX_NOEXCEPT
571 { return this->_M_impl; }
572
573 const _Node_allocator&
574 _M_get_Node_allocator() const _GLIBCXX_NOEXCEPT
575 { return this->_M_impl; }
576
577 allocator_type
578 get_allocator() const _GLIBCXX_NOEXCEPT
579 { return allocator_type(_M_get_Node_allocator()); }
580
581 protected:
582 _Link_type
583 _M_get_node()
584 { return _Alloc_traits::allocate(_M_get_Node_allocator(), 1); }
585
586 void
587 _M_put_node(_Link_type __p) _GLIBCXX_NOEXCEPT
588 { _Alloc_traits::deallocate(_M_get_Node_allocator(), __p, 1); }
589
590 #if __cplusplus < 201103L
591 void
592 _M_construct_node(_Link_type __node, const value_type& __x)
593 {
594 __try
595 { get_allocator().construct(__node->_M_valptr(), __x); }
596 __catch(...)
597 {
598 _M_put_node(__node);
599 __throw_exception_again;
600 }
601 }
602
603 _Link_type
604 _M_create_node(const value_type& __x)
605 {
606 _Link_type __tmp = _M_get_node();
607 _M_construct_node(__tmp, __x);
608 return __tmp;
609 }
610 #else
611 template<typename... _Args>
612 void
613 _M_construct_node(_Link_type __node, _Args&&... __args)
614 {
615 __try
616 {
617 ::new(__node) _Rb_tree_node<_Val>;
618 _Alloc_traits::construct(_M_get_Node_allocator(),
619 __node->_M_valptr(),
620 std::forward<_Args>(__args)...);
621 }
622 __catch(...)
623 {
624 __node->~_Rb_tree_node<_Val>();
625 _M_put_node(__node);
626 __throw_exception_again;
627 }
628 }
629
630 template<typename... _Args>
631 _Link_type
632 _M_create_node(_Args&&... __args)
633 {
634 _Link_type __tmp = _M_get_node();
635 _M_construct_node(__tmp, std::forward<_Args>(__args)...);
636 return __tmp;
637 }
638 #endif
639
640 void
641 _M_destroy_node(_Link_type __p) _GLIBCXX_NOEXCEPT
642 {
643 #if __cplusplus < 201103L
644 get_allocator().destroy(__p->_M_valptr());
645 #else
646 _Alloc_traits::destroy(_M_get_Node_allocator(), __p->_M_valptr());
647 __p->~_Rb_tree_node<_Val>();
648 #endif
649 }
650
651 void
652 _M_drop_node(_Link_type __p) _GLIBCXX_NOEXCEPT
653 {
654 _M_destroy_node(__p);
655 _M_put_node(__p);
656 }
657
658 template<typename _NodeGen>
659 _Link_type
660 _M_clone_node(_Const_Link_type __x, _NodeGen& __node_gen)
661 {
662 _Link_type __tmp = __node_gen(*__x->_M_valptr());
663 __tmp->_M_color = __x->_M_color;
664 __tmp->_M_left = 0;
665 __tmp->_M_right = 0;
666 return __tmp;
667 }
668
669 protected:
670 #if _GLIBCXX_INLINE_VERSION
671 template<typename _Key_compare>
672 #else
673 // Unused _Is_pod_comparator is kept as it is part of mangled name.
674 template<typename _Key_compare,
675 bool /* _Is_pod_comparator */ = __is_pod(_Key_compare)>
676 #endif
677 struct _Rb_tree_impl
678 : public _Node_allocator
679 , public _Rb_tree_key_compare<_Key_compare>
680 , public _Rb_tree_header
681 {
682 typedef _Rb_tree_key_compare<_Key_compare> _Base_key_compare;
683
684 _Rb_tree_impl()
685 _GLIBCXX_NOEXCEPT_IF(
686 is_nothrow_default_constructible<_Node_allocator>::value
687 && is_nothrow_default_constructible<_Base_key_compare>::value )
688 : _Node_allocator()
689 { }
690
691 _Rb_tree_impl(const _Rb_tree_impl& __x)
692 : _Node_allocator(_Alloc_traits::_S_select_on_copy(__x))
693 , _Base_key_compare(__x._M_key_compare)
694 { }
695
696 #if __cplusplus < 201103L
697 _Rb_tree_impl(const _Key_compare& __comp, const _Node_allocator& __a)
698 : _Node_allocator(__a), _Base_key_compare(__comp)
699 { }
700 #else
701 _Rb_tree_impl(_Rb_tree_impl&&) = default;
702
703 explicit
704 _Rb_tree_impl(_Node_allocator&& __a)
705 : _Node_allocator(std::move(__a))
706 { }
707
708 _Rb_tree_impl(_Rb_tree_impl&& __x, _Node_allocator&& __a)
709 : _Node_allocator(std::move(__a)),
710 _Base_key_compare(std::move(__x)),
711 _Rb_tree_header(std::move(__x))
712 { }
713
714 _Rb_tree_impl(const _Key_compare& __comp, _Node_allocator&& __a)
715 : _Node_allocator(std::move(__a)), _Base_key_compare(__comp)
716 { }
717 #endif
718 };
719
720 _Rb_tree_impl<_Compare> _M_impl;
721
722 protected:
723 _Base_ptr&
724 _M_root() _GLIBCXX_NOEXCEPT
725 { return this->_M_impl._M_header._M_parent; }
726
727 _Const_Base_ptr
728 _M_root() const _GLIBCXX_NOEXCEPT
729 { return this->_M_impl._M_header._M_parent; }
730
731 _Base_ptr&
732 _M_leftmost() _GLIBCXX_NOEXCEPT
733 { return this->_M_impl._M_header._M_left; }
734
735 _Const_Base_ptr
736 _M_leftmost() const _GLIBCXX_NOEXCEPT
737 { return this->_M_impl._M_header._M_left; }
738
739 _Base_ptr&
740 _M_rightmost() _GLIBCXX_NOEXCEPT
741 { return this->_M_impl._M_header._M_right; }
742
743 _Const_Base_ptr
744 _M_rightmost() const _GLIBCXX_NOEXCEPT
745 { return this->_M_impl._M_header._M_right; }
746
747 _Link_type
748 _M_begin() _GLIBCXX_NOEXCEPT
749 { return static_cast<_Link_type>(this->_M_impl._M_header._M_parent); }
750
751 _Const_Link_type
752 _M_begin() const _GLIBCXX_NOEXCEPT
753 {
754 return static_cast<_Const_Link_type>
755 (this->_M_impl._M_header._M_parent);
756 }
757
758 _Base_ptr
759 _M_end() _GLIBCXX_NOEXCEPT
760 { return &this->_M_impl._M_header; }
761
762 _Const_Base_ptr
763 _M_end() const _GLIBCXX_NOEXCEPT
764 { return &this->_M_impl._M_header; }
765
766 static const _Key&
767 _S_key(_Const_Link_type __x)
768 {
769 #if __cplusplus >= 201103L
770 // If we're asking for the key we're presumably using the comparison
771 // object, and so this is a good place to sanity check it.
772 static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
773 "comparison object must be invocable "
774 "with two arguments of key type");
775 # if __cplusplus >= 201703L
776 // _GLIBCXX_RESOLVE_LIB_DEFECTS
777 // 2542. Missing const requirements for associative containers
778 if constexpr (__is_invocable<_Compare&, const _Key&, const _Key&>{})
779 static_assert(
780 is_invocable_v<const _Compare&, const _Key&, const _Key&>,
781 "comparison object must be invocable as const");
782 # endif // C++17
783 #endif // C++11
784
785 return _KeyOfValue()(*__x->_M_valptr());
786 }
787
788 static _Link_type
789 _S_left(_Base_ptr __x) _GLIBCXX_NOEXCEPT
790 { return static_cast<_Link_type>(__x->_M_left); }
791
792 static _Const_Link_type
793 _S_left(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
794 { return static_cast<_Const_Link_type>(__x->_M_left); }
795
796 static _Link_type
797 _S_right(_Base_ptr __x) _GLIBCXX_NOEXCEPT
798 { return static_cast<_Link_type>(__x->_M_right); }
799
800 static _Const_Link_type
801 _S_right(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
802 { return static_cast<_Const_Link_type>(__x->_M_right); }
803
804 static const _Key&
805 _S_key(_Const_Base_ptr __x)
806 { return _S_key(static_cast<_Const_Link_type>(__x)); }
807
808 static _Base_ptr
809 _S_minimum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
810 { return _Rb_tree_node_base::_S_minimum(__x); }
811
812 static _Const_Base_ptr
813 _S_minimum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
814 { return _Rb_tree_node_base::_S_minimum(__x); }
815
816 static _Base_ptr
817 _S_maximum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
818 { return _Rb_tree_node_base::_S_maximum(__x); }
819
820 static _Const_Base_ptr
821 _S_maximum(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
822 { return _Rb_tree_node_base::_S_maximum(__x); }
823
824 public:
825 typedef _Rb_tree_iterator<value_type> iterator;
826 typedef _Rb_tree_const_iterator<value_type> const_iterator;
827
828 typedef std::reverse_iterator<iterator> reverse_iterator;
829 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
830
831 #if __cplusplus > 201402L
832 using node_type = _Node_handle<_Key, _Val, _Node_allocator>;
833 using insert_return_type = _Node_insert_return<
834 conditional_t<is_same_v<_Key, _Val>, const_iterator, iterator>,
835 node_type>;
836 #endif
837
838 pair<_Base_ptr, _Base_ptr>
839 _M_get_insert_unique_pos(const key_type& __k);
840
841 pair<_Base_ptr, _Base_ptr>
842 _M_get_insert_equal_pos(const key_type& __k);
843
844 pair<_Base_ptr, _Base_ptr>
845 _M_get_insert_hint_unique_pos(const_iterator __pos,
846 const key_type& __k);
847
848 pair<_Base_ptr, _Base_ptr>
849 _M_get_insert_hint_equal_pos(const_iterator __pos,
850 const key_type& __k);
851
852 private:
853 #if __cplusplus >= 201103L
854 template<typename _Arg, typename _NodeGen>
855 iterator
856 _M_insert_(_Base_ptr __x, _Base_ptr __y, _Arg&& __v, _NodeGen&);
857
858 iterator
859 _M_insert_node(_Base_ptr __x, _Base_ptr __y, _Link_type __z);
860
861 template<typename _Arg>
862 iterator
863 _M_insert_lower(_Base_ptr __y, _Arg&& __v);
864
865 template<typename _Arg>
866 iterator
867 _M_insert_equal_lower(_Arg&& __x);
868
869 iterator
870 _M_insert_lower_node(_Base_ptr __p, _Link_type __z);
871
872 iterator
873 _M_insert_equal_lower_node(_Link_type __z);
874 #else
875 template<typename _NodeGen>
876 iterator
877 _M_insert_(_Base_ptr __x, _Base_ptr __y,
878 const value_type& __v, _NodeGen&);
879
880 // _GLIBCXX_RESOLVE_LIB_DEFECTS
881 // 233. Insertion hints in associative containers.
882 iterator
883 _M_insert_lower(_Base_ptr __y, const value_type& __v);
884
885 iterator
886 _M_insert_equal_lower(const value_type& __x);
887 #endif
888
889 template<typename _NodeGen>
890 _Link_type
891 _M_copy(_Const_Link_type __x, _Base_ptr __p, _NodeGen&);
892
893 template<typename _NodeGen>
894 _Link_type
895 _M_copy(const _Rb_tree& __x, _NodeGen& __gen)
896 {
897 _Link_type __root = _M_copy(__x._M_begin(), _M_end(), __gen);
898 _M_leftmost() = _S_minimum(__root);
899 _M_rightmost() = _S_maximum(__root);
900 _M_impl._M_node_count = __x._M_impl._M_node_count;
901 return __root;
902 }
903
904 _Link_type
905 _M_copy(const _Rb_tree& __x)
906 {
907 _Alloc_node __an(*this);
908 return _M_copy(__x, __an);
909 }
910
911 void
912 _M_erase(_Link_type __x);
913
914 iterator
915 _M_lower_bound(_Link_type __x, _Base_ptr __y,
916 const _Key& __k);
917
918 const_iterator
919 _M_lower_bound(_Const_Link_type __x, _Const_Base_ptr __y,
920 const _Key& __k) const;
921
922 iterator
923 _M_upper_bound(_Link_type __x, _Base_ptr __y,
924 const _Key& __k);
925
926 const_iterator
927 _M_upper_bound(_Const_Link_type __x, _Const_Base_ptr __y,
928 const _Key& __k) const;
929
930 public:
931 // allocation/deallocation
932 #if __cplusplus < 201103L
933 _Rb_tree() { }
934 #else
935 _Rb_tree() = default;
936 #endif
937
938 _Rb_tree(const _Compare& __comp,
939 const allocator_type& __a = allocator_type())
940 : _M_impl(__comp, _Node_allocator(__a)) { }
941
942 _Rb_tree(const _Rb_tree& __x)
943 : _M_impl(__x._M_impl)
944 {
945 if (__x._M_root() != 0)
946 _M_root() = _M_copy(__x);
947 }
948
949 #if __cplusplus >= 201103L
950 _Rb_tree(const allocator_type& __a)
951 : _M_impl(_Node_allocator(__a))
952 { }
953
954 _Rb_tree(const _Rb_tree& __x, const allocator_type& __a)
955 : _M_impl(__x._M_impl._M_key_compare, _Node_allocator(__a))
956 {
957 if (__x._M_root() != nullptr)
958 _M_root() = _M_copy(__x);
959 }
960
961 _Rb_tree(_Rb_tree&&) = default;
962
963 _Rb_tree(_Rb_tree&& __x, const allocator_type& __a)
964 : _Rb_tree(std::move(__x), _Node_allocator(__a))
965 { }
966
967 private:
968 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a, true_type)
969 noexcept(is_nothrow_default_constructible<_Compare>::value)
970 : _M_impl(std::move(__x._M_impl), std::move(__a))
971 { }
972
973 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a, false_type)
974 : _M_impl(__x._M_impl._M_key_compare, std::move(__a))
975 {
976 if (__x._M_root() != nullptr)
977 _M_move_data(__x, false_type{});
978 }
979
980 public:
981 _Rb_tree(_Rb_tree&& __x, _Node_allocator&& __a)
982 noexcept( noexcept(
983 _Rb_tree(std::declval<_Rb_tree&&>(), std::declval<_Node_allocator&&>(),
984 std::declval<typename _Alloc_traits::is_always_equal>())) )
985 : _Rb_tree(std::move(__x), std::move(__a),
986 typename _Alloc_traits::is_always_equal{})
987 { }
988 #endif
989
990 ~_Rb_tree() _GLIBCXX_NOEXCEPT
991 { _M_erase(_M_begin()); }
992
993 _Rb_tree&
994 operator=(const _Rb_tree& __x);
995
996 // Accessors.
997 _Compare
998 key_comp() const
999 { return _M_impl._M_key_compare; }
1000
1001 iterator
1002 begin() _GLIBCXX_NOEXCEPT
1003 { return iterator(this->_M_impl._M_header._M_left); }
1004
1005 const_iterator
1006 begin() const _GLIBCXX_NOEXCEPT
1007 { return const_iterator(this->_M_impl._M_header._M_left); }
1008
1009 iterator
1010 end() _GLIBCXX_NOEXCEPT
1011 { return iterator(&this->_M_impl._M_header); }
1012
1013 const_iterator
1014 end() const _GLIBCXX_NOEXCEPT
1015 { return const_iterator(&this->_M_impl._M_header); }
1016
1017 reverse_iterator
1018 rbegin() _GLIBCXX_NOEXCEPT
1019 { return reverse_iterator(end()); }
1020
1021 const_reverse_iterator
1022 rbegin() const _GLIBCXX_NOEXCEPT
1023 { return const_reverse_iterator(end()); }
1024
1025 reverse_iterator
1026 rend() _GLIBCXX_NOEXCEPT
1027 { return reverse_iterator(begin()); }
1028
1029 const_reverse_iterator
1030 rend() const _GLIBCXX_NOEXCEPT
1031 { return const_reverse_iterator(begin()); }
1032
1033 _GLIBCXX_NODISCARD bool
1034 empty() const _GLIBCXX_NOEXCEPT
1035 { return _M_impl._M_node_count == 0; }
1036
1037 size_type
1038 size() const _GLIBCXX_NOEXCEPT
1039 { return _M_impl._M_node_count; }
1040
1041 size_type
1042 max_size() const _GLIBCXX_NOEXCEPT
1043 { return _Alloc_traits::max_size(_M_get_Node_allocator()); }
1044
1045 void
1046 swap(_Rb_tree& __t)
1047 _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value);
1048
1049 // Insert/erase.
1050 #if __cplusplus >= 201103L
1051 template<typename _Arg>
1052 pair<iterator, bool>
1053 _M_insert_unique(_Arg&& __x);
1054
1055 template<typename _Arg>
1056 iterator
1057 _M_insert_equal(_Arg&& __x);
1058
1059 template<typename _Arg, typename _NodeGen>
1060 iterator
1061 _M_insert_unique_(const_iterator __pos, _Arg&& __x, _NodeGen&);
1062
1063 template<typename _Arg>
1064 iterator
1065 _M_insert_unique_(const_iterator __pos, _Arg&& __x)
1066 {
1067 _Alloc_node __an(*this);
1068 return _M_insert_unique_(__pos, std::forward<_Arg>(__x), __an);
1069 }
1070
1071 template<typename _Arg, typename _NodeGen>
1072 iterator
1073 _M_insert_equal_(const_iterator __pos, _Arg&& __x, _NodeGen&);
1074
1075 template<typename _Arg>
1076 iterator
1077 _M_insert_equal_(const_iterator __pos, _Arg&& __x)
1078 {
1079 _Alloc_node __an(*this);
1080 return _M_insert_equal_(__pos, std::forward<_Arg>(__x), __an);
1081 }
1082
1083 template<typename... _Args>
1084 pair<iterator, bool>
1085 _M_emplace_unique(_Args&&... __args);
1086
1087 template<typename... _Args>
1088 iterator
1089 _M_emplace_equal(_Args&&... __args);
1090
1091 template<typename... _Args>
1092 iterator
1093 _M_emplace_hint_unique(const_iterator __pos, _Args&&... __args);
1094
1095 template<typename... _Args>
1096 iterator
1097 _M_emplace_hint_equal(const_iterator __pos, _Args&&... __args);
1098
1099 template<typename _Iter>
1100 using __same_value_type
1101 = is_same<value_type, typename iterator_traits<_Iter>::value_type>;
1102
1103 template<typename _InputIterator>
1104 __enable_if_t<__same_value_type<_InputIterator>::value>
1105 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1106 {
1107 _Alloc_node __an(*this);
1108 for (; __first != __last; ++__first)
1109 _M_insert_unique_(end(), *__first, __an);
1110 }
1111
1112 template<typename _InputIterator>
1113 __enable_if_t<!__same_value_type<_InputIterator>::value>
1114 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1115 {
1116 for (; __first != __last; ++__first)
1117 _M_emplace_unique(*__first);
1118 }
1119
1120 template<typename _InputIterator>
1121 __enable_if_t<__same_value_type<_InputIterator>::value>
1122 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1123 {
1124 _Alloc_node __an(*this);
1125 for (; __first != __last; ++__first)
1126 _M_insert_equal_(end(), *__first, __an);
1127 }
1128
1129 template<typename _InputIterator>
1130 __enable_if_t<!__same_value_type<_InputIterator>::value>
1131 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1132 {
1133 _Alloc_node __an(*this);
1134 for (; __first != __last; ++__first)
1135 _M_emplace_equal(*__first);
1136 }
1137 #else
1138 pair<iterator, bool>
1139 _M_insert_unique(const value_type& __x);
1140
1141 iterator
1142 _M_insert_equal(const value_type& __x);
1143
1144 template<typename _NodeGen>
1145 iterator
1146 _M_insert_unique_(const_iterator __pos, const value_type& __x,
1147 _NodeGen&);
1148
1149 iterator
1150 _M_insert_unique_(const_iterator __pos, const value_type& __x)
1151 {
1152 _Alloc_node __an(*this);
1153 return _M_insert_unique_(__pos, __x, __an);
1154 }
1155
1156 template<typename _NodeGen>
1157 iterator
1158 _M_insert_equal_(const_iterator __pos, const value_type& __x,
1159 _NodeGen&);
1160 iterator
1161 _M_insert_equal_(const_iterator __pos, const value_type& __x)
1162 {
1163 _Alloc_node __an(*this);
1164 return _M_insert_equal_(__pos, __x, __an);
1165 }
1166
1167 template<typename _InputIterator>
1168 void
1169 _M_insert_range_unique(_InputIterator __first, _InputIterator __last)
1170 {
1171 _Alloc_node __an(*this);
1172 for (; __first != __last; ++__first)
1173 _M_insert_unique_(end(), *__first, __an);
1174 }
1175
1176 template<typename _InputIterator>
1177 void
1178 _M_insert_range_equal(_InputIterator __first, _InputIterator __last)
1179 {
1180 _Alloc_node __an(*this);
1181 for (; __first != __last; ++__first)
1182 _M_insert_equal_(end(), *__first, __an);
1183 }
1184 #endif
1185
1186 private:
1187 void
1188 _M_erase_aux(const_iterator __position);
1189
1190 void
1191 _M_erase_aux(const_iterator __first, const_iterator __last);
1192
1193 public:
1194 #if __cplusplus >= 201103L
1195 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1196 // DR 130. Associative erase should return an iterator.
1197 _GLIBCXX_ABI_TAG_CXX11
1198 iterator
1199 erase(const_iterator __position)
1200 {
1201 __glibcxx_assert(__position != end());
1202 const_iterator __result = __position;
1203 ++__result;
1204 _M_erase_aux(__position);
1205 return __result._M_const_cast();
1206 }
1207
1208 // LWG 2059.
1209 _GLIBCXX_ABI_TAG_CXX11
1210 iterator
1211 erase(iterator __position)
1212 {
1213 __glibcxx_assert(__position != end());
1214 iterator __result = __position;
1215 ++__result;
1216 _M_erase_aux(__position);
1217 return __result;
1218 }
1219 #else
1220 void
1221 erase(iterator __position)
1222 {
1223 __glibcxx_assert(__position != end());
1224 _M_erase_aux(__position);
1225 }
1226
1227 void
1228 erase(const_iterator __position)
1229 {
1230 __glibcxx_assert(__position != end());
1231 _M_erase_aux(__position);
1232 }
1233 #endif
1234
1235 size_type
1236 erase(const key_type& __x);
1237
1238 #if __cplusplus >= 201103L
1239 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1240 // DR 130. Associative erase should return an iterator.
1241 _GLIBCXX_ABI_TAG_CXX11
1242 iterator
1243 erase(const_iterator __first, const_iterator __last)
1244 {
1245 _M_erase_aux(__first, __last);
1246 return __last._M_const_cast();
1247 }
1248 #else
1249 void
1250 erase(iterator __first, iterator __last)
1251 { _M_erase_aux(__first, __last); }
1252
1253 void
1254 erase(const_iterator __first, const_iterator __last)
1255 { _M_erase_aux(__first, __last); }
1256 #endif
1257
1258 void
1259 clear() _GLIBCXX_NOEXCEPT
1260 {
1261 _M_erase(_M_begin());
1262 _M_impl._M_reset();
1263 }
1264
1265 // Set operations.
1266 iterator
1267 find(const key_type& __k);
1268
1269 const_iterator
1270 find(const key_type& __k) const;
1271
1272 size_type
1273 count(const key_type& __k) const;
1274
1275 iterator
1276 lower_bound(const key_type& __k)
1277 { return _M_lower_bound(_M_begin(), _M_end(), __k); }
1278
1279 const_iterator
1280 lower_bound(const key_type& __k) const
1281 { return _M_lower_bound(_M_begin(), _M_end(), __k); }
1282
1283 iterator
1284 upper_bound(const key_type& __k)
1285 { return _M_upper_bound(_M_begin(), _M_end(), __k); }
1286
1287 const_iterator
1288 upper_bound(const key_type& __k) const
1289 { return _M_upper_bound(_M_begin(), _M_end(), __k); }
1290
1291 pair<iterator, iterator>
1292 equal_range(const key_type& __k);
1293
1294 pair<const_iterator, const_iterator>
1295 equal_range(const key_type& __k) const;
1296
1297 #if __cplusplus >= 201402L
1298 template<typename _Kt,
1299 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1300 iterator
1301 _M_find_tr(const _Kt& __k)
1302 {
1303 const _Rb_tree* __const_this = this;
1304 return __const_this->_M_find_tr(__k)._M_const_cast();
1305 }
1306
1307 template<typename _Kt,
1308 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1309 const_iterator
1310 _M_find_tr(const _Kt& __k) const
1311 {
1312 auto __j = _M_lower_bound_tr(__k);
1313 if (__j != end() && _M_impl._M_key_compare(__k, _S_key(__j._M_node)))
1314 __j = end();
1315 return __j;
1316 }
1317
1318 template<typename _Kt,
1319 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1320 size_type
1321 _M_count_tr(const _Kt& __k) const
1322 {
1323 auto __p = _M_equal_range_tr(__k);
1324 return std::distance(__p.first, __p.second);
1325 }
1326
1327 template<typename _Kt,
1328 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1329 iterator
1330 _M_lower_bound_tr(const _Kt& __k)
1331 {
1332 const _Rb_tree* __const_this = this;
1333 return __const_this->_M_lower_bound_tr(__k)._M_const_cast();
1334 }
1335
1336 template<typename _Kt,
1337 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1338 const_iterator
1339 _M_lower_bound_tr(const _Kt& __k) const
1340 {
1341 auto __x = _M_begin();
1342 auto __y = _M_end();
1343 while (__x != 0)
1344 if (!_M_impl._M_key_compare(_S_key(__x), __k))
1345 {
1346 __y = __x;
1347 __x = _S_left(__x);
1348 }
1349 else
1350 __x = _S_right(__x);
1351 return const_iterator(__y);
1352 }
1353
1354 template<typename _Kt,
1355 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1356 iterator
1357 _M_upper_bound_tr(const _Kt& __k)
1358 {
1359 const _Rb_tree* __const_this = this;
1360 return __const_this->_M_upper_bound_tr(__k)._M_const_cast();
1361 }
1362
1363 template<typename _Kt,
1364 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1365 const_iterator
1366 _M_upper_bound_tr(const _Kt& __k) const
1367 {
1368 auto __x = _M_begin();
1369 auto __y = _M_end();
1370 while (__x != 0)
1371 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1372 {
1373 __y = __x;
1374 __x = _S_left(__x);
1375 }
1376 else
1377 __x = _S_right(__x);
1378 return const_iterator(__y);
1379 }
1380
1381 template<typename _Kt,
1382 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1383 pair<iterator, iterator>
1384 _M_equal_range_tr(const _Kt& __k)
1385 {
1386 const _Rb_tree* __const_this = this;
1387 auto __ret = __const_this->_M_equal_range_tr(__k);
1388 return { __ret.first._M_const_cast(), __ret.second._M_const_cast() };
1389 }
1390
1391 template<typename _Kt,
1392 typename _Req = __has_is_transparent_t<_Compare, _Kt>>
1393 pair<const_iterator, const_iterator>
1394 _M_equal_range_tr(const _Kt& __k) const
1395 {
1396 auto __low = _M_lower_bound_tr(__k);
1397 auto __high = __low;
1398 auto& __cmp = _M_impl._M_key_compare;
1399 while (__high != end() && !__cmp(__k, _S_key(__high._M_node)))
1400 ++__high;
1401 return { __low, __high };
1402 }
1403 #endif
1404
1405 // Debugging.
1406 bool
1407 __rb_verify() const;
1408
1409 #if __cplusplus >= 201103L
1410 _Rb_tree&
1411 operator=(_Rb_tree&&)
1412 noexcept(_Alloc_traits::_S_nothrow_move()
1413 && is_nothrow_move_assignable<_Compare>::value);
1414
1415 template<typename _Iterator>
1416 void
1417 _M_assign_unique(_Iterator, _Iterator);
1418
1419 template<typename _Iterator>
1420 void
1421 _M_assign_equal(_Iterator, _Iterator);
1422
1423 private:
1424 // Move elements from container with equal allocator.
1425 void
1426 _M_move_data(_Rb_tree& __x, true_type)
1427 { _M_impl._M_move_data(__x._M_impl); }
1428
1429 // Move elements from container with possibly non-equal allocator,
1430 // which might result in a copy not a move.
1431 void
1432 _M_move_data(_Rb_tree&, false_type);
1433
1434 // Move assignment from container with equal allocator.
1435 void
1436 _M_move_assign(_Rb_tree&, true_type);
1437
1438 // Move assignment from container with possibly non-equal allocator,
1439 // which might result in a copy not a move.
1440 void
1441 _M_move_assign(_Rb_tree&, false_type);
1442 #endif
1443
1444 #if __cplusplus > 201402L
1445 public:
1446 /// Re-insert an extracted node.
1447 insert_return_type
1448 _M_reinsert_node_unique(node_type&& __nh)
1449 {
1450 insert_return_type __ret;
1451 if (__nh.empty())
1452 __ret.position = end();
1453 else
1454 {
1455 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1456
1457 auto __res = _M_get_insert_unique_pos(__nh._M_key());
1458 if (__res.second)
1459 {
1460 __ret.position
1461 = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1462 __nh._M_ptr = nullptr;
1463 __ret.inserted = true;
1464 }
1465 else
1466 {
1467 __ret.node = std::move(__nh);
1468 __ret.position = iterator(__res.first);
1469 __ret.inserted = false;
1470 }
1471 }
1472 return __ret;
1473 }
1474
1475 /// Re-insert an extracted node.
1476 iterator
1477 _M_reinsert_node_equal(node_type&& __nh)
1478 {
1479 iterator __ret;
1480 if (__nh.empty())
1481 __ret = end();
1482 else
1483 {
1484 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1485 auto __res = _M_get_insert_equal_pos(__nh._M_key());
1486 if (__res.second)
1487 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1488 else
1489 __ret = _M_insert_equal_lower_node(__nh._M_ptr);
1490 __nh._M_ptr = nullptr;
1491 }
1492 return __ret;
1493 }
1494
1495 /// Re-insert an extracted node.
1496 iterator
1497 _M_reinsert_node_hint_unique(const_iterator __hint, node_type&& __nh)
1498 {
1499 iterator __ret;
1500 if (__nh.empty())
1501 __ret = end();
1502 else
1503 {
1504 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1505 auto __res = _M_get_insert_hint_unique_pos(__hint, __nh._M_key());
1506 if (__res.second)
1507 {
1508 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1509 __nh._M_ptr = nullptr;
1510 }
1511 else
1512 __ret = iterator(__res.first);
1513 }
1514 return __ret;
1515 }
1516
1517 /// Re-insert an extracted node.
1518 iterator
1519 _M_reinsert_node_hint_equal(const_iterator __hint, node_type&& __nh)
1520 {
1521 iterator __ret;
1522 if (__nh.empty())
1523 __ret = end();
1524 else
1525 {
1526 __glibcxx_assert(_M_get_Node_allocator() == *__nh._M_alloc);
1527 auto __res = _M_get_insert_hint_equal_pos(__hint, __nh._M_key());
1528 if (__res.second)
1529 __ret = _M_insert_node(__res.first, __res.second, __nh._M_ptr);
1530 else
1531 __ret = _M_insert_equal_lower_node(__nh._M_ptr);
1532 __nh._M_ptr = nullptr;
1533 }
1534 return __ret;
1535 }
1536
1537 /// Extract a node.
1538 node_type
1539 extract(const_iterator __pos)
1540 {
1541 auto __ptr = _Rb_tree_rebalance_for_erase(
1542 __pos._M_const_cast()._M_node, _M_impl._M_header);
1543 --_M_impl._M_node_count;
1544 return { static_cast<_Link_type>(__ptr), _M_get_Node_allocator() };
1545 }
1546
1547 /// Extract a node.
1548 node_type
1549 extract(const key_type& __k)
1550 {
1551 node_type __nh;
1552 auto __pos = find(__k);
1553 if (__pos != end())
1554 __nh = extract(const_iterator(__pos));
1555 return __nh;
1556 }
1557
1558 template<typename _Compare2>
1559 using _Compatible_tree
1560 = _Rb_tree<_Key, _Val, _KeyOfValue, _Compare2, _Alloc>;
1561
1562 template<typename, typename>
1563 friend class _Rb_tree_merge_helper;
1564
1565 /// Merge from a compatible container into one with unique keys.
1566 template<typename _Compare2>
1567 void
1568 _M_merge_unique(_Compatible_tree<_Compare2>& __src) noexcept
1569 {
1570 using _Merge_helper = _Rb_tree_merge_helper<_Rb_tree, _Compare2>;
1571 for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
1572 {
1573 auto __pos = __i++;
1574 auto __res = _M_get_insert_unique_pos(_KeyOfValue()(*__pos));
1575 if (__res.second)
1576 {
1577 auto& __src_impl = _Merge_helper::_S_get_impl(__src);
1578 auto __ptr = _Rb_tree_rebalance_for_erase(
1579 __pos._M_node, __src_impl._M_header);
1580 --__src_impl._M_node_count;
1581 _M_insert_node(__res.first, __res.second,
1582 static_cast<_Link_type>(__ptr));
1583 }
1584 }
1585 }
1586
1587 /// Merge from a compatible container into one with equivalent keys.
1588 template<typename _Compare2>
1589 void
1590 _M_merge_equal(_Compatible_tree<_Compare2>& __src) noexcept
1591 {
1592 using _Merge_helper = _Rb_tree_merge_helper<_Rb_tree, _Compare2>;
1593 for (auto __i = __src.begin(), __end = __src.end(); __i != __end;)
1594 {
1595 auto __pos = __i++;
1596 auto __res = _M_get_insert_equal_pos(_KeyOfValue()(*__pos));
1597 if (__res.second)
1598 {
1599 auto& __src_impl = _Merge_helper::_S_get_impl(__src);
1600 auto __ptr = _Rb_tree_rebalance_for_erase(
1601 __pos._M_node, __src_impl._M_header);
1602 --__src_impl._M_node_count;
1603 _M_insert_node(__res.first, __res.second,
1604 static_cast<_Link_type>(__ptr));
1605 }
1606 }
1607 }
1608 #endif // C++17
1609
1610 friend bool
1611 operator==(const _Rb_tree& __x, const _Rb_tree& __y)
1612 {
1613 return __x.size() == __y.size()
1614 && std::equal(__x.begin(), __x.end(), __y.begin());
1615 }
1616
1617 #if __cpp_lib_three_way_comparison
1618 friend auto
1619 operator<=>(const _Rb_tree& __x, const _Rb_tree& __y)
1620 {
1621 if constexpr (requires { typename __detail::__synth3way_t<_Val>; })
1622 return std::lexicographical_compare_three_way(__x.begin(), __x.end(),
1623 __y.begin(), __y.end(),
1624 __detail::__synth3way);
1625 }
1626 #else
1627 friend bool
1628 operator<(const _Rb_tree& __x, const _Rb_tree& __y)
1629 {
1630 return std::lexicographical_compare(__x.begin(), __x.end(),
1631 __y.begin(), __y.end());
1632 }
1633
1634 friend bool _GLIBCXX_DEPRECATED
1635 operator!=(const _Rb_tree& __x, const _Rb_tree& __y)
1636 { return !(__x == __y); }
1637
1638 friend bool _GLIBCXX_DEPRECATED
1639 operator>(const _Rb_tree& __x, const _Rb_tree& __y)
1640 { return __y < __x; }
1641
1642 friend bool _GLIBCXX_DEPRECATED
1643 operator<=(const _Rb_tree& __x, const _Rb_tree& __y)
1644 { return !(__y < __x); }
1645
1646 friend bool _GLIBCXX_DEPRECATED
1647 operator>=(const _Rb_tree& __x, const _Rb_tree& __y)
1648 { return !(__x < __y); }
1649 #endif
1650 };
1651
1652 template<typename _Key, typename _Val, typename _KeyOfValue,
1653 typename _Compare, typename _Alloc>
1654 inline void
1655 swap(_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
1656 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __y)
1657 { __x.swap(__y); }
1658
1659 #if __cplusplus >= 201103L
1660 template<typename _Key, typename _Val, typename _KeyOfValue,
1661 typename _Compare, typename _Alloc>
1662 void
1663 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1664 _M_move_data(_Rb_tree& __x, false_type)
1665 {
1666 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1667 _M_move_data(__x, true_type());
1668 else
1669 {
1670 _Alloc_node __an(*this);
1671 auto __lbd =
1672 [&__an](const value_type& __cval)
1673 {
1674 auto& __val = const_cast<value_type&>(__cval);
1675 return __an(std::move_if_noexcept(__val));
1676 };
1677 _M_root() = _M_copy(__x, __lbd);
1678 }
1679 }
1680
1681 template<typename _Key, typename _Val, typename _KeyOfValue,
1682 typename _Compare, typename _Alloc>
1683 inline void
1684 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1685 _M_move_assign(_Rb_tree& __x, true_type)
1686 {
1687 clear();
1688 if (__x._M_root() != nullptr)
1689 _M_move_data(__x, true_type());
1690 std::__alloc_on_move(_M_get_Node_allocator(),
1691 __x._M_get_Node_allocator());
1692 }
1693
1694 template<typename _Key, typename _Val, typename _KeyOfValue,
1695 typename _Compare, typename _Alloc>
1696 void
1697 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1698 _M_move_assign(_Rb_tree& __x, false_type)
1699 {
1700 if (_M_get_Node_allocator() == __x._M_get_Node_allocator())
1701 return _M_move_assign(__x, true_type{});
1702
1703 // Try to move each node reusing existing nodes and copying __x nodes
1704 // structure.
1705 _Reuse_or_alloc_node __roan(*this);
1706 _M_impl._M_reset();
1707 if (__x._M_root() != nullptr)
1708 {
1709 auto __lbd =
1710 [&__roan](const value_type& __cval)
1711 {
1712 auto& __val = const_cast<value_type&>(__cval);
1713 return __roan(std::move(__val));
1714 };
1715 _M_root() = _M_copy(__x, __lbd);
1716 __x.clear();
1717 }
1718 }
1719
1720 template<typename _Key, typename _Val, typename _KeyOfValue,
1721 typename _Compare, typename _Alloc>
1722 inline _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1723 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1724 operator=(_Rb_tree&& __x)
1725 noexcept(_Alloc_traits::_S_nothrow_move()
1726 && is_nothrow_move_assignable<_Compare>::value)
1727 {
1728 _M_impl._M_key_compare = std::move(__x._M_impl._M_key_compare);
1729 _M_move_assign(__x, __bool_constant<_Alloc_traits::_S_nothrow_move()>());
1730 return *this;
1731 }
1732
1733 template<typename _Key, typename _Val, typename _KeyOfValue,
1734 typename _Compare, typename _Alloc>
1735 template<typename _Iterator>
1736 void
1737 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1738 _M_assign_unique(_Iterator __first, _Iterator __last)
1739 {
1740 _Reuse_or_alloc_node __roan(*this);
1741 _M_impl._M_reset();
1742 for (; __first != __last; ++__first)
1743 _M_insert_unique_(end(), *__first, __roan);
1744 }
1745
1746 template<typename _Key, typename _Val, typename _KeyOfValue,
1747 typename _Compare, typename _Alloc>
1748 template<typename _Iterator>
1749 void
1750 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1751 _M_assign_equal(_Iterator __first, _Iterator __last)
1752 {
1753 _Reuse_or_alloc_node __roan(*this);
1754 _M_impl._M_reset();
1755 for (; __first != __last; ++__first)
1756 _M_insert_equal_(end(), *__first, __roan);
1757 }
1758 #endif
1759
1760 template<typename _Key, typename _Val, typename _KeyOfValue,
1761 typename _Compare, typename _Alloc>
1762 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&
1763 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1764 operator=(const _Rb_tree& __x)
1765 {
1766 if (this != &__x)
1767 {
1768 // Note that _Key may be a constant type.
1769 #if __cplusplus >= 201103L
1770 if (_Alloc_traits::_S_propagate_on_copy_assign())
1771 {
1772 auto& __this_alloc = this->_M_get_Node_allocator();
1773 auto& __that_alloc = __x._M_get_Node_allocator();
1774 if (!_Alloc_traits::_S_always_equal()
1775 && __this_alloc != __that_alloc)
1776 {
1777 // Replacement allocator cannot free existing storage, we need
1778 // to erase nodes first.
1779 clear();
1780 std::__alloc_on_copy(__this_alloc, __that_alloc);
1781 }
1782 }
1783 #endif
1784
1785 _Reuse_or_alloc_node __roan(*this);
1786 _M_impl._M_reset();
1787 _M_impl._M_key_compare = __x._M_impl._M_key_compare;
1788 if (__x._M_root() != 0)
1789 _M_root() = _M_copy(__x, __roan);
1790 }
1791
1792 return *this;
1793 }
1794
1795 template<typename _Key, typename _Val, typename _KeyOfValue,
1796 typename _Compare, typename _Alloc>
1797 #if __cplusplus >= 201103L
1798 template<typename _Arg, typename _NodeGen>
1799 #else
1800 template<typename _NodeGen>
1801 #endif
1802 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1803 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1804 _M_insert_(_Base_ptr __x, _Base_ptr __p,
1805 #if __cplusplus >= 201103L
1806 _Arg&& __v,
1807 #else
1808 const _Val& __v,
1809 #endif
1810 _NodeGen& __node_gen)
1811 {
1812 bool __insert_left = (__x != 0 || __p == _M_end()
1813 || _M_impl._M_key_compare(_KeyOfValue()(__v),
1814 _S_key(__p)));
1815
1816 _Link_type __z = __node_gen(_GLIBCXX_FORWARD(_Arg, __v));
1817
1818 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1819 this->_M_impl._M_header);
1820 ++_M_impl._M_node_count;
1821 return iterator(__z);
1822 }
1823
1824 template<typename _Key, typename _Val, typename _KeyOfValue,
1825 typename _Compare, typename _Alloc>
1826 #if __cplusplus >= 201103L
1827 template<typename _Arg>
1828 #endif
1829 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1830 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1831 #if __cplusplus >= 201103L
1832 _M_insert_lower(_Base_ptr __p, _Arg&& __v)
1833 #else
1834 _M_insert_lower(_Base_ptr __p, const _Val& __v)
1835 #endif
1836 {
1837 bool __insert_left = (__p == _M_end()
1838 || !_M_impl._M_key_compare(_S_key(__p),
1839 _KeyOfValue()(__v)));
1840
1841 _Link_type __z = _M_create_node(_GLIBCXX_FORWARD(_Arg, __v));
1842
1843 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
1844 this->_M_impl._M_header);
1845 ++_M_impl._M_node_count;
1846 return iterator(__z);
1847 }
1848
1849 template<typename _Key, typename _Val, typename _KeyOfValue,
1850 typename _Compare, typename _Alloc>
1851 #if __cplusplus >= 201103L
1852 template<typename _Arg>
1853 #endif
1854 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
1855 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1856 #if __cplusplus >= 201103L
1857 _M_insert_equal_lower(_Arg&& __v)
1858 #else
1859 _M_insert_equal_lower(const _Val& __v)
1860 #endif
1861 {
1862 _Link_type __x = _M_begin();
1863 _Base_ptr __y = _M_end();
1864 while (__x != 0)
1865 {
1866 __y = __x;
1867 __x = !_M_impl._M_key_compare(_S_key(__x), _KeyOfValue()(__v)) ?
1868 _S_left(__x) : _S_right(__x);
1869 }
1870 return _M_insert_lower(__y, _GLIBCXX_FORWARD(_Arg, __v));
1871 }
1872
1873 template<typename _Key, typename _Val, typename _KoV,
1874 typename _Compare, typename _Alloc>
1875 template<typename _NodeGen>
1876 typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::_Link_type
1877 _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::
1878 _M_copy(_Const_Link_type __x, _Base_ptr __p, _NodeGen& __node_gen)
1879 {
1880 // Structural copy. __x and __p must be non-null.
1881 _Link_type __top = _M_clone_node(__x, __node_gen);
1882 __top->_M_parent = __p;
1883
1884 __try
1885 {
1886 if (__x->_M_right)
1887 __top->_M_right = _M_copy(_S_right(__x), __top, __node_gen);
1888 __p = __top;
1889 __x = _S_left(__x);
1890
1891 while (__x != 0)
1892 {
1893 _Link_type __y = _M_clone_node(__x, __node_gen);
1894 __p->_M_left = __y;
1895 __y->_M_parent = __p;
1896 if (__x->_M_right)
1897 __y->_M_right = _M_copy(_S_right(__x), __y, __node_gen);
1898 __p = __y;
1899 __x = _S_left(__x);
1900 }
1901 }
1902 __catch(...)
1903 {
1904 _M_erase(__top);
1905 __throw_exception_again;
1906 }
1907 return __top;
1908 }
1909
1910 template<typename _Key, typename _Val, typename _KeyOfValue,
1911 typename _Compare, typename _Alloc>
1912 void
1913 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1914 _M_erase(_Link_type __x)
1915 {
1916 // Erase without rebalancing.
1917 while (__x != 0)
1918 {
1919 _M_erase(_S_right(__x));
1920 _Link_type __y = _S_left(__x);
1921 _M_drop_node(__x);
1922 __x = __y;
1923 }
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_lower_bound(_Link_type __x, _Base_ptr __y,
1932 const _Key& __k)
1933 {
1934 while (__x != 0)
1935 if (!_M_impl._M_key_compare(_S_key(__x), __k))
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_lower_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(_S_key(__x), __k))
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 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1961 _Compare, _Alloc>::iterator
1962 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1963 _M_upper_bound(_Link_type __x, _Base_ptr __y,
1964 const _Key& __k)
1965 {
1966 while (__x != 0)
1967 if (_M_impl._M_key_compare(__k, _S_key(__x)))
1968 __y = __x, __x = _S_left(__x);
1969 else
1970 __x = _S_right(__x);
1971 return 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>::const_iterator
1978 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1979 _M_upper_bound(_Const_Link_type __x, _Const_Base_ptr __y,
1980 const _Key& __k) const
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 const_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>::iterator,
1994 typename _Rb_tree<_Key, _Val, _KeyOfValue,
1995 _Compare, _Alloc>::iterator>
1996 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
1997 equal_range(const _Key& __k)
1998 {
1999 _Link_type __x = _M_begin();
2000 _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 _Link_type __xu(__x);
2010 _Base_ptr __yu(__y);
2011 __y = __x, __x = _S_left(__x);
2012 __xu = _S_right(__xu);
2013 return pair<iterator,
2014 iterator>(_M_lower_bound(__x, __y, __k),
2015 _M_upper_bound(__xu, __yu, __k));
2016 }
2017 }
2018 return pair<iterator, iterator>(iterator(__y),
2019 iterator(__y));
2020 }
2021
2022 template<typename _Key, typename _Val, typename _KeyOfValue,
2023 typename _Compare, typename _Alloc>
2024 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2025 _Compare, _Alloc>::const_iterator,
2026 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2027 _Compare, _Alloc>::const_iterator>
2028 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2029 equal_range(const _Key& __k) const
2030 {
2031 _Const_Link_type __x = _M_begin();
2032 _Const_Base_ptr __y = _M_end();
2033 while (__x != 0)
2034 {
2035 if (_M_impl._M_key_compare(_S_key(__x), __k))
2036 __x = _S_right(__x);
2037 else if (_M_impl._M_key_compare(__k, _S_key(__x)))
2038 __y = __x, __x = _S_left(__x);
2039 else
2040 {
2041 _Const_Link_type __xu(__x);
2042 _Const_Base_ptr __yu(__y);
2043 __y = __x, __x = _S_left(__x);
2044 __xu = _S_right(__xu);
2045 return pair<const_iterator,
2046 const_iterator>(_M_lower_bound(__x, __y, __k),
2047 _M_upper_bound(__xu, __yu, __k));
2048 }
2049 }
2050 return pair<const_iterator, const_iterator>(const_iterator(__y),
2051 const_iterator(__y));
2052 }
2053
2054 template<typename _Key, typename _Val, typename _KeyOfValue,
2055 typename _Compare, typename _Alloc>
2056 void
2057 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2058 swap(_Rb_tree& __t)
2059 _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
2060 {
2061 if (_M_root() == 0)
2062 {
2063 if (__t._M_root() != 0)
2064 _M_impl._M_move_data(__t._M_impl);
2065 }
2066 else if (__t._M_root() == 0)
2067 __t._M_impl._M_move_data(_M_impl);
2068 else
2069 {
2070 std::swap(_M_root(),__t._M_root());
2071 std::swap(_M_leftmost(),__t._M_leftmost());
2072 std::swap(_M_rightmost(),__t._M_rightmost());
2073
2074 _M_root()->_M_parent = _M_end();
2075 __t._M_root()->_M_parent = __t._M_end();
2076 std::swap(this->_M_impl._M_node_count, __t._M_impl._M_node_count);
2077 }
2078 // No need to swap header's color as it does not change.
2079 std::swap(this->_M_impl._M_key_compare, __t._M_impl._M_key_compare);
2080
2081 _Alloc_traits::_S_on_swap(_M_get_Node_allocator(),
2082 __t._M_get_Node_allocator());
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_unique_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 bool __comp = true;
2098 while (__x != 0)
2099 {
2100 __y = __x;
2101 __comp = _M_impl._M_key_compare(__k, _S_key(__x));
2102 __x = __comp ? _S_left(__x) : _S_right(__x);
2103 }
2104 iterator __j = iterator(__y);
2105 if (__comp)
2106 {
2107 if (__j == begin())
2108 return _Res(__x, __y);
2109 else
2110 --__j;
2111 }
2112 if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
2113 return _Res(__x, __y);
2114 return _Res(__j._M_node, 0);
2115 }
2116
2117 template<typename _Key, typename _Val, typename _KeyOfValue,
2118 typename _Compare, typename _Alloc>
2119 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2120 _Compare, _Alloc>::_Base_ptr,
2121 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2122 _Compare, _Alloc>::_Base_ptr>
2123 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2124 _M_get_insert_equal_pos(const key_type& __k)
2125 {
2126 typedef pair<_Base_ptr, _Base_ptr> _Res;
2127 _Link_type __x = _M_begin();
2128 _Base_ptr __y = _M_end();
2129 while (__x != 0)
2130 {
2131 __y = __x;
2132 __x = _M_impl._M_key_compare(__k, _S_key(__x)) ?
2133 _S_left(__x) : _S_right(__x);
2134 }
2135 return _Res(__x, __y);
2136 }
2137
2138 template<typename _Key, typename _Val, typename _KeyOfValue,
2139 typename _Compare, typename _Alloc>
2140 #if __cplusplus >= 201103L
2141 template<typename _Arg>
2142 #endif
2143 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2144 _Compare, _Alloc>::iterator, bool>
2145 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2146 #if __cplusplus >= 201103L
2147 _M_insert_unique(_Arg&& __v)
2148 #else
2149 _M_insert_unique(const _Val& __v)
2150 #endif
2151 {
2152 typedef pair<iterator, bool> _Res;
2153 pair<_Base_ptr, _Base_ptr> __res
2154 = _M_get_insert_unique_pos(_KeyOfValue()(__v));
2155
2156 if (__res.second)
2157 {
2158 _Alloc_node __an(*this);
2159 return _Res(_M_insert_(__res.first, __res.second,
2160 _GLIBCXX_FORWARD(_Arg, __v), __an),
2161 true);
2162 }
2163
2164 return _Res(iterator(__res.first), false);
2165 }
2166
2167 template<typename _Key, typename _Val, typename _KeyOfValue,
2168 typename _Compare, typename _Alloc>
2169 #if __cplusplus >= 201103L
2170 template<typename _Arg>
2171 #endif
2172 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2173 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2174 #if __cplusplus >= 201103L
2175 _M_insert_equal(_Arg&& __v)
2176 #else
2177 _M_insert_equal(const _Val& __v)
2178 #endif
2179 {
2180 pair<_Base_ptr, _Base_ptr> __res
2181 = _M_get_insert_equal_pos(_KeyOfValue()(__v));
2182 _Alloc_node __an(*this);
2183 return _M_insert_(__res.first, __res.second,
2184 _GLIBCXX_FORWARD(_Arg, __v), __an);
2185 }
2186
2187 template<typename _Key, typename _Val, typename _KeyOfValue,
2188 typename _Compare, typename _Alloc>
2189 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2190 _Compare, _Alloc>::_Base_ptr,
2191 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2192 _Compare, _Alloc>::_Base_ptr>
2193 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2194 _M_get_insert_hint_unique_pos(const_iterator __position,
2195 const key_type& __k)
2196 {
2197 iterator __pos = __position._M_const_cast();
2198 typedef pair<_Base_ptr, _Base_ptr> _Res;
2199
2200 // end()
2201 if (__pos._M_node == _M_end())
2202 {
2203 if (size() > 0
2204 && _M_impl._M_key_compare(_S_key(_M_rightmost()), __k))
2205 return _Res(0, _M_rightmost());
2206 else
2207 return _M_get_insert_unique_pos(__k);
2208 }
2209 else if (_M_impl._M_key_compare(__k, _S_key(__pos._M_node)))
2210 {
2211 // First, try before...
2212 iterator __before = __pos;
2213 if (__pos._M_node == _M_leftmost()) // begin()
2214 return _Res(_M_leftmost(), _M_leftmost());
2215 else if (_M_impl._M_key_compare(_S_key((--__before)._M_node), __k))
2216 {
2217 if (_S_right(__before._M_node) == 0)
2218 return _Res(0, __before._M_node);
2219 else
2220 return _Res(__pos._M_node, __pos._M_node);
2221 }
2222 else
2223 return _M_get_insert_unique_pos(__k);
2224 }
2225 else if (_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2226 {
2227 // ... then try after.
2228 iterator __after = __pos;
2229 if (__pos._M_node == _M_rightmost())
2230 return _Res(0, _M_rightmost());
2231 else if (_M_impl._M_key_compare(__k, _S_key((++__after)._M_node)))
2232 {
2233 if (_S_right(__pos._M_node) == 0)
2234 return _Res(0, __pos._M_node);
2235 else
2236 return _Res(__after._M_node, __after._M_node);
2237 }
2238 else
2239 return _M_get_insert_unique_pos(__k);
2240 }
2241 else
2242 // Equivalent keys.
2243 return _Res(__pos._M_node, 0);
2244 }
2245
2246 template<typename _Key, typename _Val, typename _KeyOfValue,
2247 typename _Compare, typename _Alloc>
2248 #if __cplusplus >= 201103L
2249 template<typename _Arg, typename _NodeGen>
2250 #else
2251 template<typename _NodeGen>
2252 #endif
2253 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2254 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2255 _M_insert_unique_(const_iterator __position,
2256 #if __cplusplus >= 201103L
2257 _Arg&& __v,
2258 #else
2259 const _Val& __v,
2260 #endif
2261 _NodeGen& __node_gen)
2262 {
2263 pair<_Base_ptr, _Base_ptr> __res
2264 = _M_get_insert_hint_unique_pos(__position, _KeyOfValue()(__v));
2265
2266 if (__res.second)
2267 return _M_insert_(__res.first, __res.second,
2268 _GLIBCXX_FORWARD(_Arg, __v),
2269 __node_gen);
2270 return iterator(__res.first);
2271 }
2272
2273 template<typename _Key, typename _Val, typename _KeyOfValue,
2274 typename _Compare, typename _Alloc>
2275 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2276 _Compare, _Alloc>::_Base_ptr,
2277 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2278 _Compare, _Alloc>::_Base_ptr>
2279 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2280 _M_get_insert_hint_equal_pos(const_iterator __position, const key_type& __k)
2281 {
2282 iterator __pos = __position._M_const_cast();
2283 typedef pair<_Base_ptr, _Base_ptr> _Res;
2284
2285 // end()
2286 if (__pos._M_node == _M_end())
2287 {
2288 if (size() > 0
2289 && !_M_impl._M_key_compare(__k, _S_key(_M_rightmost())))
2290 return _Res(0, _M_rightmost());
2291 else
2292 return _M_get_insert_equal_pos(__k);
2293 }
2294 else if (!_M_impl._M_key_compare(_S_key(__pos._M_node), __k))
2295 {
2296 // First, try before...
2297 iterator __before = __pos;
2298 if (__pos._M_node == _M_leftmost()) // begin()
2299 return _Res(_M_leftmost(), _M_leftmost());
2300 else if (!_M_impl._M_key_compare(__k, _S_key((--__before)._M_node)))
2301 {
2302 if (_S_right(__before._M_node) == 0)
2303 return _Res(0, __before._M_node);
2304 else
2305 return _Res(__pos._M_node, __pos._M_node);
2306 }
2307 else
2308 return _M_get_insert_equal_pos(__k);
2309 }
2310 else
2311 {
2312 // ... then try after.
2313 iterator __after = __pos;
2314 if (__pos._M_node == _M_rightmost())
2315 return _Res(0, _M_rightmost());
2316 else if (!_M_impl._M_key_compare(_S_key((++__after)._M_node), __k))
2317 {
2318 if (_S_right(__pos._M_node) == 0)
2319 return _Res(0, __pos._M_node);
2320 else
2321 return _Res(__after._M_node, __after._M_node);
2322 }
2323 else
2324 return _Res(0, 0);
2325 }
2326 }
2327
2328 template<typename _Key, typename _Val, typename _KeyOfValue,
2329 typename _Compare, typename _Alloc>
2330 #if __cplusplus >= 201103L
2331 template<typename _Arg, typename _NodeGen>
2332 #else
2333 template<typename _NodeGen>
2334 #endif
2335 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2336 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2337 _M_insert_equal_(const_iterator __position,
2338 #if __cplusplus >= 201103L
2339 _Arg&& __v,
2340 #else
2341 const _Val& __v,
2342 #endif
2343 _NodeGen& __node_gen)
2344 {
2345 pair<_Base_ptr, _Base_ptr> __res
2346 = _M_get_insert_hint_equal_pos(__position, _KeyOfValue()(__v));
2347
2348 if (__res.second)
2349 return _M_insert_(__res.first, __res.second,
2350 _GLIBCXX_FORWARD(_Arg, __v),
2351 __node_gen);
2352
2353 return _M_insert_equal_lower(_GLIBCXX_FORWARD(_Arg, __v));
2354 }
2355
2356 #if __cplusplus >= 201103L
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_node(_Base_ptr __x, _Base_ptr __p, _Link_type __z)
2362 {
2363 bool __insert_left = (__x != 0 || __p == _M_end()
2364 || _M_impl._M_key_compare(_S_key(__z),
2365 _S_key(__p)));
2366
2367 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2368 this->_M_impl._M_header);
2369 ++_M_impl._M_node_count;
2370 return iterator(__z);
2371 }
2372
2373 template<typename _Key, typename _Val, typename _KeyOfValue,
2374 typename _Compare, typename _Alloc>
2375 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2376 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2377 _M_insert_lower_node(_Base_ptr __p, _Link_type __z)
2378 {
2379 bool __insert_left = (__p == _M_end()
2380 || !_M_impl._M_key_compare(_S_key(__p),
2381 _S_key(__z)));
2382
2383 _Rb_tree_insert_and_rebalance(__insert_left, __z, __p,
2384 this->_M_impl._M_header);
2385 ++_M_impl._M_node_count;
2386 return iterator(__z);
2387 }
2388
2389 template<typename _Key, typename _Val, typename _KeyOfValue,
2390 typename _Compare, typename _Alloc>
2391 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2392 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2393 _M_insert_equal_lower_node(_Link_type __z)
2394 {
2395 _Link_type __x = _M_begin();
2396 _Base_ptr __y = _M_end();
2397 while (__x != 0)
2398 {
2399 __y = __x;
2400 __x = !_M_impl._M_key_compare(_S_key(__x), _S_key(__z)) ?
2401 _S_left(__x) : _S_right(__x);
2402 }
2403 return _M_insert_lower_node(__y, __z);
2404 }
2405
2406 template<typename _Key, typename _Val, typename _KeyOfValue,
2407 typename _Compare, typename _Alloc>
2408 template<typename... _Args>
2409 pair<typename _Rb_tree<_Key, _Val, _KeyOfValue,
2410 _Compare, _Alloc>::iterator, bool>
2411 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2412 _M_emplace_unique(_Args&&... __args)
2413 {
2414 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2415
2416 __try
2417 {
2418 typedef pair<iterator, bool> _Res;
2419 auto __res = _M_get_insert_unique_pos(_S_key(__z));
2420 if (__res.second)
2421 return _Res(_M_insert_node(__res.first, __res.second, __z), true);
2422
2423 _M_drop_node(__z);
2424 return _Res(iterator(__res.first), false);
2425 }
2426 __catch(...)
2427 {
2428 _M_drop_node(__z);
2429 __throw_exception_again;
2430 }
2431 }
2432
2433 template<typename _Key, typename _Val, typename _KeyOfValue,
2434 typename _Compare, typename _Alloc>
2435 template<typename... _Args>
2436 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2437 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2438 _M_emplace_equal(_Args&&... __args)
2439 {
2440 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2441
2442 __try
2443 {
2444 auto __res = _M_get_insert_equal_pos(_S_key(__z));
2445 return _M_insert_node(__res.first, __res.second, __z);
2446 }
2447 __catch(...)
2448 {
2449 _M_drop_node(__z);
2450 __throw_exception_again;
2451 }
2452 }
2453
2454 template<typename _Key, typename _Val, typename _KeyOfValue,
2455 typename _Compare, typename _Alloc>
2456 template<typename... _Args>
2457 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2458 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2459 _M_emplace_hint_unique(const_iterator __pos, _Args&&... __args)
2460 {
2461 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2462
2463 __try
2464 {
2465 auto __res = _M_get_insert_hint_unique_pos(__pos, _S_key(__z));
2466
2467 if (__res.second)
2468 return _M_insert_node(__res.first, __res.second, __z);
2469
2470 _M_drop_node(__z);
2471 return iterator(__res.first);
2472 }
2473 __catch(...)
2474 {
2475 _M_drop_node(__z);
2476 __throw_exception_again;
2477 }
2478 }
2479
2480 template<typename _Key, typename _Val, typename _KeyOfValue,
2481 typename _Compare, typename _Alloc>
2482 template<typename... _Args>
2483 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
2484 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2485 _M_emplace_hint_equal(const_iterator __pos, _Args&&... __args)
2486 {
2487 _Link_type __z = _M_create_node(std::forward<_Args>(__args)...);
2488
2489 __try
2490 {
2491 auto __res = _M_get_insert_hint_equal_pos(__pos, _S_key(__z));
2492
2493 if (__res.second)
2494 return _M_insert_node(__res.first, __res.second, __z);
2495
2496 return _M_insert_equal_lower_node(__z);
2497 }
2498 __catch(...)
2499 {
2500 _M_drop_node(__z);
2501 __throw_exception_again;
2502 }
2503 }
2504 #endif
2505
2506
2507 template<typename _Key, typename _Val, typename _KeyOfValue,
2508 typename _Compare, typename _Alloc>
2509 void
2510 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2511 _M_erase_aux(const_iterator __position)
2512 {
2513 _Link_type __y =
2514 static_cast<_Link_type>(_Rb_tree_rebalance_for_erase
2515 (const_cast<_Base_ptr>(__position._M_node),
2516 this->_M_impl._M_header));
2517 _M_drop_node(__y);
2518 --_M_impl._M_node_count;
2519 }
2520
2521 template<typename _Key, typename _Val, typename _KeyOfValue,
2522 typename _Compare, typename _Alloc>
2523 void
2524 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2525 _M_erase_aux(const_iterator __first, const_iterator __last)
2526 {
2527 if (__first == begin() && __last == end())
2528 clear();
2529 else
2530 while (__first != __last)
2531 _M_erase_aux(__first++);
2532 }
2533
2534 template<typename _Key, typename _Val, typename _KeyOfValue,
2535 typename _Compare, typename _Alloc>
2536 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2537 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2538 erase(const _Key& __x)
2539 {
2540 pair<iterator, iterator> __p = equal_range(__x);
2541 const size_type __old_size = size();
2542 _M_erase_aux(__p.first, __p.second);
2543 return __old_size - size();
2544 }
2545
2546 template<typename _Key, typename _Val, typename _KeyOfValue,
2547 typename _Compare, typename _Alloc>
2548 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2549 _Compare, _Alloc>::iterator
2550 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2551 find(const _Key& __k)
2552 {
2553 iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2554 return (__j == end()
2555 || _M_impl._M_key_compare(__k,
2556 _S_key(__j._M_node))) ? end() : __j;
2557 }
2558
2559 template<typename _Key, typename _Val, typename _KeyOfValue,
2560 typename _Compare, typename _Alloc>
2561 typename _Rb_tree<_Key, _Val, _KeyOfValue,
2562 _Compare, _Alloc>::const_iterator
2563 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2564 find(const _Key& __k) const
2565 {
2566 const_iterator __j = _M_lower_bound(_M_begin(), _M_end(), __k);
2567 return (__j == end()
2568 || _M_impl._M_key_compare(__k,
2569 _S_key(__j._M_node))) ? end() : __j;
2570 }
2571
2572 template<typename _Key, typename _Val, typename _KeyOfValue,
2573 typename _Compare, typename _Alloc>
2574 typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::size_type
2575 _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
2576 count(const _Key& __k) const
2577 {
2578 pair<const_iterator, const_iterator> __p = equal_range(__k);
2579 const size_type __n = std::distance(__p.first, __p.second);
2580 return __n;
2581 }
2582
2583 _GLIBCXX_PURE unsigned int
2584 _Rb_tree_black_count(const _Rb_tree_node_base* __node,
2585 const _Rb_tree_node_base* __root) throw ();
2586
2587 template<typename _Key, typename _Val, typename _KeyOfValue,
2588 typename _Compare, typename _Alloc>
2589 bool
2590 _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::__rb_verify() const
2591 {
2592 if (_M_impl._M_node_count == 0 || begin() == end())
2593 return _M_impl._M_node_count == 0 && begin() == end()
2594 && this->_M_impl._M_header._M_left == _M_end()
2595 && this->_M_impl._M_header._M_right == _M_end();
2596
2597 unsigned int __len = _Rb_tree_black_count(_M_leftmost(), _M_root());
2598 for (const_iterator __it = begin(); __it != end(); ++__it)
2599 {
2600 _Const_Link_type __x = static_cast<_Const_Link_type>(__it._M_node);
2601 _Const_Link_type __L = _S_left(__x);
2602 _Const_Link_type __R = _S_right(__x);
2603
2604 if (__x->_M_color == _S_red)
2605 if ((__L && __L->_M_color == _S_red)
2606 || (__R && __R->_M_color == _S_red))
2607 return false;
2608
2609 if (__L && _M_impl._M_key_compare(_S_key(__x), _S_key(__L)))
2610 return false;
2611 if (__R && _M_impl._M_key_compare(_S_key(__R), _S_key(__x)))
2612 return false;
2613
2614 if (!__L && !__R && _Rb_tree_black_count(__x, _M_root()) != __len)
2615 return false;
2616 }
2617
2618 if (_M_leftmost() != _Rb_tree_node_base::_S_minimum(_M_root()))
2619 return false;
2620 if (_M_rightmost() != _Rb_tree_node_base::_S_maximum(_M_root()))
2621 return false;
2622 return true;
2623 }
2624
2625 #if __cplusplus > 201402L
2626 // Allow access to internals of compatible _Rb_tree specializations.
2627 template<typename _Key, typename _Val, typename _Sel, typename _Cmp1,
2628 typename _Alloc, typename _Cmp2>
2629 struct _Rb_tree_merge_helper<_Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>,
2630 _Cmp2>
2631 {
2632 private:
2633 friend class _Rb_tree<_Key, _Val, _Sel, _Cmp1, _Alloc>;
2634
2635 static auto&
2636 _S_get_impl(_Rb_tree<_Key, _Val, _Sel, _Cmp2, _Alloc>& __tree)
2637 { return __tree._M_impl; }
2638 };
2639 #endif // C++17
2640
2641 _GLIBCXX_END_NAMESPACE_VERSION
2642 } // namespace
2643
2644 #endif
2645