1// List implementation (out of line) -*- C++ -*-
2
3// Copyright (C) 2001-2019 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) 1994
28 * Hewlett-Packard Company
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. Hewlett-Packard Company 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) 1996,1997
40 * Silicon Graphics Computer Systems, Inc.
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. Silicon Graphics 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/** @file bits/list.tcc
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{list}
54 */
55
56#ifndef _LIST_TCC
57#define _LIST_TCC 1
58
59namespace std _GLIBCXX_VISIBILITY(default)
60{
61_GLIBCXX_BEGIN_NAMESPACE_VERSION
62_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
63
64 template<typename _Tp, typename _Alloc>
65 void
66 _List_base<_Tp, _Alloc>::
67 _M_clear() _GLIBCXX_NOEXCEPT
68 {
69 typedef _List_node<_Tp> _Node;
70 __detail::_List_node_base* __cur = _M_impl._M_node._M_next;
71 while (__cur != &_M_impl._M_node)
72 {
73 _Node* __tmp = static_cast<_Node*>(__cur);
74 __cur = __tmp->_M_next;
75 _Tp* __val = __tmp->_M_valptr();
76#if __cplusplus >= 201103L
77 _Node_alloc_traits::destroy(_M_get_Node_allocator(), __val);
78#else
79 _Tp_alloc_type(_M_get_Node_allocator()).destroy(__val);
80#endif
81 _M_put_node(__tmp);
82 }
83 }
84
85#if __cplusplus >= 201103L
86 template<typename _Tp, typename _Alloc>
87 template<typename... _Args>
88 typename list<_Tp, _Alloc>::iterator
89 list<_Tp, _Alloc>::
90 emplace(const_iterator __position, _Args&&... __args)
91 {
92 _Node* __tmp = _M_create_node(std::forward<_Args>(__args)...);
93 __tmp->_M_hook(__position._M_const_cast()._M_node);
94 this->_M_inc_size(1);
95 return iterator(__tmp);
96 }
97#endif
98
99 template<typename _Tp, typename _Alloc>
100 typename list<_Tp, _Alloc>::iterator
101 list<_Tp, _Alloc>::
102#if __cplusplus >= 201103L
103 insert(const_iterator __position, const value_type& __x)
104#else
105 insert(iterator __position, const value_type& __x)
106#endif
107 {
108 _Node* __tmp = _M_create_node(__x);
109 __tmp->_M_hook(__position._M_const_cast()._M_node);
110 this->_M_inc_size(1);
111 return iterator(__tmp);
112 }
113
114#if __cplusplus >= 201103L
115 template<typename _Tp, typename _Alloc>
116 typename list<_Tp, _Alloc>::iterator
117 list<_Tp, _Alloc>::
118 insert(const_iterator __position, size_type __n, const value_type& __x)
119 {
120 if (__n)
121 {
122 list __tmp(__n, __x, get_allocator());
123 iterator __it = __tmp.begin();
124 splice(__position, __tmp);
125 return __it;
126 }
127 return __position._M_const_cast();
128 }
129
130 template<typename _Tp, typename _Alloc>
131 template<typename _InputIterator, typename>
132 typename list<_Tp, _Alloc>::iterator
133 list<_Tp, _Alloc>::
134 insert(const_iterator __position, _InputIterator __first,
135 _InputIterator __last)
136 {
137 list __tmp(__first, __last, get_allocator());
138 if (!__tmp.empty())
139 {
140 iterator __it = __tmp.begin();
141 splice(__position, __tmp);
142 return __it;
143 }
144 return __position._M_const_cast();
145 }
146#endif
147
148 template<typename _Tp, typename _Alloc>
149 typename list<_Tp, _Alloc>::iterator
150 list<_Tp, _Alloc>::
151#if __cplusplus >= 201103L
152 erase(const_iterator __position) noexcept
153#else
154 erase(iterator __position)
155#endif
156 {
157 iterator __ret = iterator(__position._M_node->_M_next);
158 _M_erase(__position._M_const_cast());
159 return __ret;
160 }
161
162 // Return a const_iterator indicating the position to start inserting or
163 // erasing elements (depending whether the list is growing or shrinking),
164 // and set __new_size to the number of new elements that must be appended.
165 // Equivalent to the following, but performed optimally:
166 // if (__new_size < size()) {
167 // __new_size = 0;
168 // return std::next(begin(), __new_size);
169 // } else {
170 // __newsize -= size();
171 // return end();
172 // }
173 template<typename _Tp, typename _Alloc>
174 typename list<_Tp, _Alloc>::const_iterator
175 list<_Tp, _Alloc>::
176 _M_resize_pos(size_type& __new_size) const
177 {
178 const_iterator __i;
179#if _GLIBCXX_USE_CXX11_ABI
180 const size_type __len = size();
181 if (__new_size < __len)
182 {
183 if (__new_size <= __len / 2)
184 {
185 __i = begin();
186 std::advance(__i, __new_size);
187 }
188 else
189 {
190 __i = end();
191 ptrdiff_t __num_erase = __len - __new_size;
192 std::advance(__i, -__num_erase);
193 }
194 __new_size = 0;
195 return __i;
196 }
197 else
198 __i = end();
199#else
200 size_type __len = 0;
201 for (__i = begin(); __i != end() && __len < __new_size; ++__i, ++__len)
202 ;
203#endif
204 __new_size -= __len;
205 return __i;
206 }
207
208#if __cplusplus >= 201103L
209 template<typename _Tp, typename _Alloc>
210 void
211 list<_Tp, _Alloc>::
212 _M_default_append(size_type __n)
213 {
214 size_type __i = 0;
215 __try
216 {
217 for (; __i < __n; ++__i)
218 emplace_back();
219 }
220 __catch(...)
221 {
222 for (; __i; --__i)
223 pop_back();
224 __throw_exception_again;
225 }
226 }
227
228 template<typename _Tp, typename _Alloc>
229 void
230 list<_Tp, _Alloc>::
231 resize(size_type __new_size)
232 {
233 const_iterator __i = _M_resize_pos(__new_size);
234 if (__new_size)
235 _M_default_append(__new_size);
236 else
237 erase(__i, end());
238 }
239
240 template<typename _Tp, typename _Alloc>
241 void
242 list<_Tp, _Alloc>::
243 resize(size_type __new_size, const value_type& __x)
244 {
245 const_iterator __i = _M_resize_pos(__new_size);
246 if (__new_size)
247 insert(end(), __new_size, __x);
248 else
249 erase(__i, end());
250 }
251#else
252 template<typename _Tp, typename _Alloc>
253 void
254 list<_Tp, _Alloc>::
255 resize(size_type __new_size, value_type __x)
256 {
257 const_iterator __i = _M_resize_pos(__new_size);
258 if (__new_size)
259 insert(end(), __new_size, __x);
260 else
261 erase(__i._M_const_cast(), end());
262 }
263#endif
264
265 template<typename _Tp, typename _Alloc>
266 list<_Tp, _Alloc>&
267 list<_Tp, _Alloc>::
268 operator=(const list& __x)
269 {
270 if (this != std::__addressof(__x))
271 {
272#if __cplusplus >= 201103L
273 if (_Node_alloc_traits::_S_propagate_on_copy_assign())
274 {
275 auto& __this_alloc = this->_M_get_Node_allocator();
276 auto& __that_alloc = __x._M_get_Node_allocator();
277 if (!_Node_alloc_traits::_S_always_equal()
278 && __this_alloc != __that_alloc)
279 {
280 // replacement allocator cannot free existing storage
281 clear();
282 }
283 std::__alloc_on_copy(__this_alloc, __that_alloc);
284 }
285#endif
286 _M_assign_dispatch(__x.begin(), __x.end(), __false_type());
287 }
288 return *this;
289 }
290
291 template<typename _Tp, typename _Alloc>
292 void
293 list<_Tp, _Alloc>::
294 _M_fill_assign(size_type __n, const value_type& __val)
295 {
296 iterator __i = begin();
297 for (; __i != end() && __n > 0; ++__i, --__n)
298 *__i = __val;
299 if (__n > 0)
300 insert(end(), __n, __val);
301 else
302 erase(__i, end());
303 }
304
305 template<typename _Tp, typename _Alloc>
306 template <typename _InputIterator>
307 void
308 list<_Tp, _Alloc>::
309 _M_assign_dispatch(_InputIterator __first2, _InputIterator __last2,
310 __false_type)
311 {
312 iterator __first1 = begin();
313 iterator __last1 = end();
314 for (; __first1 != __last1 && __first2 != __last2;
315 ++__first1, (void)++__first2)
316 *__first1 = *__first2;
317 if (__first2 == __last2)
318 erase(__first1, __last1);
319 else
320 insert(__last1, __first2, __last2);
321 }
322
323#if __cplusplus > 201703L
324# define _GLIBCXX20_ONLY(__expr) __expr
325#else
326# define _GLIBCXX20_ONLY(__expr)
327#endif
328
329 template<typename _Tp, typename _Alloc>
330 typename list<_Tp, _Alloc>::__remove_return_type
331 list<_Tp, _Alloc>::
332 remove(const value_type& __value)
333 {
334 size_type __removed __attribute__((__unused__)) = 0;
335 iterator __first = begin();
336 iterator __last = end();
337 iterator __extra = __last;
338 while (__first != __last)
339 {
340 iterator __next = __first;
341 ++__next;
342 if (*__first == __value)
343 {
344 // _GLIBCXX_RESOLVE_LIB_DEFECTS
345 // 526. Is it undefined if a function in the standard changes
346 // in parameters?
347 if (std::__addressof(*__first) != std::__addressof(__value))
348 {
349 _M_erase(__first);
350 _GLIBCXX20_ONLY( __removed++ );
351 }
352 else
353 __extra = __first;
354 }
355 __first = __next;
356 }
357 if (__extra != __last)
358 {
359 _M_erase(__extra);
360 _GLIBCXX20_ONLY( __removed++ );
361 }
362 return _GLIBCXX20_ONLY( __removed );
363 }
364
365 template<typename _Tp, typename _Alloc>
366 typename list<_Tp, _Alloc>::__remove_return_type
367 list<_Tp, _Alloc>::
368 unique()
369 {
370 iterator __first = begin();
371 iterator __last = end();
372 if (__first == __last)
373 return _GLIBCXX20_ONLY( 0 );
374 size_type __removed __attribute__((__unused__)) = 0;
375 iterator __next = __first;
376 while (++__next != __last)
377 {
378 if (*__first == *__next)
379 {
380 _M_erase(__next);
381 _GLIBCXX20_ONLY( __removed++ );
382 }
383 else
384 __first = __next;
385 __next = __first;
386 }
387 return _GLIBCXX20_ONLY( __removed );
388 }
389
390 template<typename _Tp, typename _Alloc>
391 void
392 list<_Tp, _Alloc>::
393#if __cplusplus >= 201103L
394 merge(list&& __x)
395#else
396 merge(list& __x)
397#endif
398 {
399 // _GLIBCXX_RESOLVE_LIB_DEFECTS
400 // 300. list::merge() specification incomplete
401 if (this != std::__addressof(__x))
402 {
403 _M_check_equal_allocators(__x);
404
405 iterator __first1 = begin();
406 iterator __last1 = end();
407 iterator __first2 = __x.begin();
408 iterator __last2 = __x.end();
409 const size_t __orig_size = __x.size();
410 __try {
411 while (__first1 != __last1 && __first2 != __last2)
412 if (*__first2 < *__first1)
413 {
414 iterator __next = __first2;
415 _M_transfer(__first1, __first2, ++__next);
416 __first2 = __next;
417 }
418 else
419 ++__first1;
420 if (__first2 != __last2)
421 _M_transfer(__last1, __first2, __last2);
422
423 this->_M_inc_size(__x._M_get_size());
424 __x._M_set_size(0);
425 }
426 __catch(...)
427 {
428 const size_t __dist = std::distance(__first2, __last2);
429 this->_M_inc_size(__orig_size - __dist);
430 __x._M_set_size(__dist);
431 __throw_exception_again;
432 }
433 }
434 }
435
436 template<typename _Tp, typename _Alloc>
437 template <typename _StrictWeakOrdering>
438 void
439 list<_Tp, _Alloc>::
440#if __cplusplus >= 201103L
441 merge(list&& __x, _StrictWeakOrdering __comp)
442#else
443 merge(list& __x, _StrictWeakOrdering __comp)
444#endif
445 {
446 // _GLIBCXX_RESOLVE_LIB_DEFECTS
447 // 300. list::merge() specification incomplete
448 if (this != std::__addressof(__x))
449 {
450 _M_check_equal_allocators(__x);
451
452 iterator __first1 = begin();
453 iterator __last1 = end();
454 iterator __first2 = __x.begin();
455 iterator __last2 = __x.end();
456 const size_t __orig_size = __x.size();
457 __try
458 {
459 while (__first1 != __last1 && __first2 != __last2)
460 if (__comp(*__first2, *__first1))
461 {
462 iterator __next = __first2;
463 _M_transfer(__first1, __first2, ++__next);
464 __first2 = __next;
465 }
466 else
467 ++__first1;
468 if (__first2 != __last2)
469 _M_transfer(__last1, __first2, __last2);
470
471 this->_M_inc_size(__x._M_get_size());
472 __x._M_set_size(0);
473 }
474 __catch(...)
475 {
476 const size_t __dist = std::distance(__first2, __last2);
477 this->_M_inc_size(__orig_size - __dist);
478 __x._M_set_size(__dist);
479 __throw_exception_again;
480 }
481 }
482 }
483
484 template<typename _Tp, typename _Alloc>
485 void
486 list<_Tp, _Alloc>::
487 sort()
488 {
489 // Do nothing if the list has length 0 or 1.
490 if (this->_M_impl._M_node._M_next != &this->_M_impl._M_node
491 && this->_M_impl._M_node._M_next->_M_next != &this->_M_impl._M_node)
492 {
493 list __carry;
494 list __tmp[64];
495 list * __fill = __tmp;
496 list * __counter;
497 __try
498 {
499 do
500 {
501 __carry.splice(__carry.begin(), *this, begin());
502
503 for(__counter = __tmp;
504 __counter != __fill && !__counter->empty();
505 ++__counter)
506 {
507 __counter->merge(__carry);
508 __carry.swap(*__counter);
509 }
510 __carry.swap(*__counter);
511 if (__counter == __fill)
512 ++__fill;
513 }
514 while ( !empty() );
515
516 for (__counter = __tmp + 1; __counter != __fill; ++__counter)
517 __counter->merge(*(__counter - 1));
518 swap( *(__fill - 1) );
519 }
520 __catch(...)
521 {
522 this->splice(this->end(), __carry);
523 for (int __i = 0; __i < sizeof(__tmp)/sizeof(__tmp[0]); ++__i)
524 this->splice(this->end(), __tmp[__i]);
525 __throw_exception_again;
526 }
527 }
528 }
529
530 template<typename _Tp, typename _Alloc>
531 template <typename _Predicate>
532 typename list<_Tp, _Alloc>::__remove_return_type
533 list<_Tp, _Alloc>::
534 remove_if(_Predicate __pred)
535 {
536 size_type __removed __attribute__((__unused__)) = 0;
537 iterator __first = begin();
538 iterator __last = end();
539 while (__first != __last)
540 {
541 iterator __next = __first;
542 ++__next;
543 if (__pred(*__first))
544 {
545 _M_erase(__first);
546 _GLIBCXX20_ONLY( __removed++ );
547 }
548 __first = __next;
549 }
550 return _GLIBCXX20_ONLY( __removed );
551 }
552
553 template<typename _Tp, typename _Alloc>
554 template <typename _BinaryPredicate>
555 typename list<_Tp, _Alloc>::__remove_return_type
556 list<_Tp, _Alloc>::
557 unique(_BinaryPredicate __binary_pred)
558 {
559 iterator __first = begin();
560 iterator __last = end();
561 if (__first == __last)
562 return _GLIBCXX20_ONLY(0);
563 size_type __removed __attribute__((__unused__)) = 0;
564 iterator __next = __first;
565 while (++__next != __last)
566 {
567 if (__binary_pred(*__first, *__next))
568 {
569 _M_erase(__next);
570 _GLIBCXX20_ONLY( __removed++ );
571 }
572 else
573 __first = __next;
574 __next = __first;
575 }
576 return _GLIBCXX20_ONLY( __removed );
577 }
578
579#undef _GLIBCXX20_ONLY
580
581 template<typename _Tp, typename _Alloc>
582 template <typename _StrictWeakOrdering>
583 void
584 list<_Tp, _Alloc>::
585 sort(_StrictWeakOrdering __comp)
586 {
587 // Do nothing if the list has length 0 or 1.
588 if (this->_M_impl._M_node._M_next != &this->_M_impl._M_node
589 && this->_M_impl._M_node._M_next->_M_next != &this->_M_impl._M_node)
590 {
591 list __carry;
592 list __tmp[64];
593 list * __fill = __tmp;
594 list * __counter;
595 __try
596 {
597 do
598 {
599 __carry.splice(__carry.begin(), *this, begin());
600
601 for(__counter = __tmp;
602 __counter != __fill && !__counter->empty();
603 ++__counter)
604 {
605 __counter->merge(__carry, __comp);
606 __carry.swap(*__counter);
607 }
608 __carry.swap(*__counter);
609 if (__counter == __fill)
610 ++__fill;
611 }
612 while ( !empty() );
613
614 for (__counter = __tmp + 1; __counter != __fill; ++__counter)
615 __counter->merge(*(__counter - 1), __comp);
616 swap(*(__fill - 1));
617 }
618 __catch(...)
619 {
620 this->splice(this->end(), __carry);
621 for (int __i = 0; __i < sizeof(__tmp)/sizeof(__tmp[0]); ++__i)
622 this->splice(this->end(), __tmp[__i]);
623 __throw_exception_again;
624 }
625 }
626 }
627
628_GLIBCXX_END_NAMESPACE_CONTAINER
629_GLIBCXX_END_NAMESPACE_VERSION
630} // namespace std
631
632#endif /* _LIST_TCC */
633
634