1// <forward_list> -*- C++ -*- 2 3// Copyright (C) 2010-2020 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/** @file debug/forward_list 26 * This file is a GNU debug extension to the Standard C++ Library. 27 */ 28 29#ifndef _GLIBCXX_DEBUG_FORWARD_LIST 30#define _GLIBCXX_DEBUG_FORWARD_LIST 1 31 32#pragma GCC system_header 33 34#include <bits/c++config.h> 35namespace std _GLIBCXX_VISIBILITY(default) { namespace __debug { 36 template<typename _Tp, typename _Allocator> class forward_list; 37} } // namespace std::__debug 38 39#include <forward_list> 40#include <debug/safe_sequence.h> 41#include <debug/safe_container.h> 42#include <debug/safe_iterator.h> 43 44// Special validity check for forward_list ranges. 45#define __glibcxx_check_valid_fl_range(_First,_Last,_Dist) \ 46_GLIBCXX_DEBUG_VERIFY(_First._M_valid_range(_Last, _Dist, false), \ 47 _M_message(__gnu_debug::__msg_valid_range) \ 48 ._M_iterator(_First, #_First) \ 49 ._M_iterator(_Last, #_Last)) 50 51namespace __gnu_debug 52{ 53 /// Special iterators swap and invalidation for forward_list because of the 54 /// before_begin iterator. 55 template<typename _SafeSequence> 56 class _Safe_forward_list 57 : public _Safe_sequence<_SafeSequence> 58 { 59 _SafeSequence& 60 _M_this() noexcept 61 { return *static_cast<_SafeSequence*>(this); } 62 63 static void 64 _M_swap_aux(_Safe_sequence_base& __lhs, 65 _Safe_iterator_base*& __lhs_iterators, 66 _Safe_sequence_base& __rhs, 67 _Safe_iterator_base*& __rhs_iterators); 68 69 void _M_swap_single(_Safe_sequence_base&) noexcept; 70 71 protected: 72 void 73 _M_invalidate_all() 74 { 75 using _Base_const_iterator = __decltype(_M_this()._M_base().cend()); 76 this->_M_invalidate_if([this](_Base_const_iterator __it) 77 { 78 return __it != _M_this()._M_base().cbefore_begin() 79 && __it != _M_this()._M_base().cend(); }); 80 } 81 82 void _M_swap(_Safe_sequence_base&) noexcept; 83 }; 84 85 template<typename _SafeSequence> 86 void 87 _Safe_forward_list<_SafeSequence>:: 88 _M_swap_aux(_Safe_sequence_base& __lhs, 89 _Safe_iterator_base*& __lhs_iterators, 90 _Safe_sequence_base& __rhs, 91 _Safe_iterator_base*& __rhs_iterators) 92 { 93 using const_iterator = typename _SafeSequence::const_iterator; 94 _Safe_iterator_base* __bbegin_its = 0; 95 _Safe_iterator_base* __last_bbegin = 0; 96 _SafeSequence& __rseq = static_cast<_SafeSequence&>(__rhs); 97 98 for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;) 99 { 100 // Even iterator is cast to const_iterator, not a problem. 101 _Safe_iterator_base* __victim_base = __iter; 102 const_iterator* __victim = 103 static_cast<const_iterator*>(__victim_base); 104 __iter = __iter->_M_next; 105 if (__victim->base() == __rseq._M_base().cbefore_begin()) 106 { 107 __victim->_M_unlink(); 108 if (__lhs_iterators == __victim_base) 109 __lhs_iterators = __victim_base->_M_next; 110 if (__bbegin_its) 111 { 112 __victim_base->_M_next = __bbegin_its; 113 __bbegin_its->_M_prior = __victim_base; 114 } 115 else 116 __last_bbegin = __victim_base; 117 __bbegin_its = __victim_base; 118 } 119 else 120 __victim_base->_M_sequence = std::__addressof(__lhs); 121 } 122 123 if (__bbegin_its) 124 { 125 if (__rhs_iterators) 126 { 127 __rhs_iterators->_M_prior = __last_bbegin; 128 __last_bbegin->_M_next = __rhs_iterators; 129 } 130 __rhs_iterators = __bbegin_its; 131 } 132 } 133 134 template<typename _SafeSequence> 135 void 136 _Safe_forward_list<_SafeSequence>:: 137 _M_swap_single(_Safe_sequence_base& __other) noexcept 138 { 139 std::swap(_M_this()._M_iterators, __other._M_iterators); 140 std::swap(_M_this()._M_const_iterators, __other._M_const_iterators); 141 // Useless, always 1 on forward_list 142 //std::swap(_M_this()_M_version, __other._M_version); 143 _Safe_iterator_base* __this_its = _M_this()._M_iterators; 144 _M_swap_aux(__other, __other._M_iterators, 145 _M_this(), _M_this()._M_iterators); 146 _Safe_iterator_base* __this_const_its = _M_this()._M_const_iterators; 147 _M_swap_aux(__other, __other._M_const_iterators, 148 _M_this(), _M_this()._M_const_iterators); 149 _M_swap_aux(_M_this(), __this_its, 150 __other, __other._M_iterators); 151 _M_swap_aux(_M_this(), __this_const_its, 152 __other, __other._M_const_iterators); 153 } 154 155 /* Special forward_list _M_swap version that does not swap the 156 * before-begin ownership.*/ 157 template<typename _SafeSequence> 158 void 159 _Safe_forward_list<_SafeSequence>:: 160 _M_swap(_Safe_sequence_base& __other) noexcept 161 { 162 // We need to lock both sequences to swap 163 using namespace __gnu_cxx; 164 __mutex *__this_mutex = &_M_this()._M_get_mutex(); 165 __mutex *__other_mutex = 166 &static_cast<_SafeSequence&>(__other)._M_get_mutex(); 167 if (__this_mutex == __other_mutex) 168 { 169 __scoped_lock __lock(*__this_mutex); 170 _M_swap_single(__other); 171 } 172 else 173 { 174 __scoped_lock __l1(__this_mutex < __other_mutex 175 ? *__this_mutex : *__other_mutex); 176 __scoped_lock __l2(__this_mutex < __other_mutex 177 ? *__other_mutex : *__this_mutex); 178 _M_swap_single(__other); 179 } 180 } 181} 182 183namespace std _GLIBCXX_VISIBILITY(default) 184{ 185namespace __debug 186{ 187 /// Class std::forward_list with safety/checking/debug instrumentation. 188 template<typename _Tp, typename _Alloc = std::allocator<_Tp> > 189 class forward_list 190 : public __gnu_debug::_Safe_container< 191 forward_list<_Tp, _Alloc>, _Alloc, __gnu_debug::_Safe_forward_list>, 192 public _GLIBCXX_STD_C::forward_list<_Tp, _Alloc> 193 { 194 typedef _GLIBCXX_STD_C::forward_list<_Tp, _Alloc> _Base; 195 typedef __gnu_debug::_Safe_container< 196 forward_list, _Alloc, __gnu_debug::_Safe_forward_list> _Safe; 197 198 typedef typename _Base::iterator _Base_iterator; 199 typedef typename _Base::const_iterator _Base_const_iterator; 200 201 template<typename _ItT, typename _SeqT, typename _CatT> 202 friend class ::__gnu_debug::_Safe_iterator; 203 204 public: 205 typedef typename _Base::reference reference; 206 typedef typename _Base::const_reference const_reference; 207 208 typedef __gnu_debug::_Safe_iterator< 209 _Base_iterator, forward_list> iterator; 210 typedef __gnu_debug::_Safe_iterator< 211 _Base_const_iterator, forward_list> const_iterator; 212 213 typedef typename _Base::size_type size_type; 214 typedef typename _Base::difference_type difference_type; 215 216 typedef _Tp value_type; 217 typedef typename _Base::allocator_type allocator_type; 218 typedef typename _Base::pointer pointer; 219 typedef typename _Base::const_pointer const_pointer; 220 221 // 23.2.3.1 construct/copy/destroy: 222 223 forward_list() = default; 224 225 explicit 226 forward_list(const allocator_type& __al) noexcept 227 : _Base(__al) { } 228 229 forward_list(const forward_list& __list, const allocator_type& __al) 230 : _Base(__list, __al) 231 { } 232 233 forward_list(forward_list&& __list, const allocator_type& __al) 234 : _Safe(std::move(__list._M_safe()), __al), 235 _Base(std::move(__list._M_base()), __al) 236 { } 237 238 explicit 239 forward_list(size_type __n, const allocator_type& __al = allocator_type()) 240 : _Base(__n, __al) 241 { } 242 243 forward_list(size_type __n, const _Tp& __value, 244 const allocator_type& __al = allocator_type()) 245 : _Base(__n, __value, __al) 246 { } 247 248 template<typename _InputIterator, 249 typename = std::_RequireInputIter<_InputIterator>> 250 forward_list(_InputIterator __first, _InputIterator __last, 251 const allocator_type& __al = allocator_type()) 252 : _Base(__gnu_debug::__base( 253 __glibcxx_check_valid_constructor_range(__first, __last)), 254 __gnu_debug::__base(__last), __al) 255 { } 256 257 forward_list(const forward_list&) = default; 258 259 forward_list(forward_list&&) = default; 260 261 forward_list(std::initializer_list<_Tp> __il, 262 const allocator_type& __al = allocator_type()) 263 : _Base(__il, __al) 264 { } 265 266 ~forward_list() = default; 267 268 forward_list& 269 operator=(const forward_list&) = default; 270 271 forward_list& 272 operator=(forward_list&&) = default; 273 274 forward_list& 275 operator=(std::initializer_list<_Tp> __il) 276 { 277 _M_base() = __il; 278 this->_M_invalidate_all(); 279 return *this; 280 } 281 282 template<typename _InputIterator, 283 typename = std::_RequireInputIter<_InputIterator>> 284 void 285 assign(_InputIterator __first, _InputIterator __last) 286 { 287 typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist; 288 __glibcxx_check_valid_range2(__first, __last, __dist); 289 290 if (__dist.second >= __gnu_debug::__dp_sign) 291 _Base::assign(__gnu_debug::__unsafe(__first), 292 __gnu_debug::__unsafe(__last)); 293 else 294 _Base::assign(__first, __last); 295 296 this->_M_invalidate_all(); 297 } 298 299 void 300 assign(size_type __n, const _Tp& __val) 301 { 302 _Base::assign(__n, __val); 303 this->_M_invalidate_all(); 304 } 305 306 void 307 assign(std::initializer_list<_Tp> __il) 308 { 309 _Base::assign(__il); 310 this->_M_invalidate_all(); 311 } 312 313 using _Base::get_allocator; 314 315 // iterators: 316 317 iterator 318 before_begin() noexcept 319 { return { _Base::before_begin(), this }; } 320 321 const_iterator 322 before_begin() const noexcept 323 { return { _Base::before_begin(), this }; } 324 325 iterator 326 begin() noexcept 327 { return { _Base::begin(), this }; } 328 329 const_iterator 330 begin() const noexcept 331 { return { _Base::begin(), this }; } 332 333 iterator 334 end() noexcept 335 { return { _Base::end(), this }; } 336 337 const_iterator 338 end() const noexcept 339 { return { _Base::end(), this }; } 340 341 const_iterator 342 cbegin() const noexcept 343 { return { _Base::cbegin(), this }; } 344 345 const_iterator 346 cbefore_begin() const noexcept 347 { return { _Base::cbefore_begin(), this }; } 348 349 const_iterator 350 cend() const noexcept 351 { return { _Base::cend(), this }; } 352 353 using _Base::empty; 354 using _Base::max_size; 355 356 // element access: 357 358 reference 359 front() 360 { 361 __glibcxx_check_nonempty(); 362 return _Base::front(); 363 } 364 365 const_reference 366 front() const 367 { 368 __glibcxx_check_nonempty(); 369 return _Base::front(); 370 } 371 372 // modifiers: 373 374 using _Base::emplace_front; 375 using _Base::push_front; 376 377 void 378 pop_front() 379 { 380 __glibcxx_check_nonempty(); 381 this->_M_invalidate_if([this](_Base_const_iterator __it) 382 { return __it == this->_M_base().cbegin(); }); 383 _Base::pop_front(); 384 } 385 386 template<typename... _Args> 387 iterator 388 emplace_after(const_iterator __pos, _Args&&... __args) 389 { 390 __glibcxx_check_insert_after(__pos); 391 return { _Base::emplace_after(__pos.base(), 392 std::forward<_Args>(__args)...), 393 this }; 394 } 395 396 iterator 397 insert_after(const_iterator __pos, const _Tp& __val) 398 { 399 __glibcxx_check_insert_after(__pos); 400 return { _Base::insert_after(__pos.base(), __val), this }; 401 } 402 403 iterator 404 insert_after(const_iterator __pos, _Tp&& __val) 405 { 406 __glibcxx_check_insert_after(__pos); 407 return { _Base::insert_after(__pos.base(), std::move(__val)), this }; 408 } 409 410 iterator 411 insert_after(const_iterator __pos, size_type __n, const _Tp& __val) 412 { 413 __glibcxx_check_insert_after(__pos); 414 return { _Base::insert_after(__pos.base(), __n, __val), this }; 415 } 416 417 template<typename _InputIterator, 418 typename = std::_RequireInputIter<_InputIterator>> 419 iterator 420 insert_after(const_iterator __pos, 421 _InputIterator __first, _InputIterator __last) 422 { 423 typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist; 424 __glibcxx_check_insert_range_after(__pos, __first, __last, __dist); 425 426 if (__dist.second >= __gnu_debug::__dp_sign) 427 return 428 { 429 _Base::insert_after(__pos.base(), 430 __gnu_debug::__unsafe(__first), 431 __gnu_debug::__unsafe(__last)), 432 this 433 }; 434 else 435 return { _Base::insert_after(__pos.base(), __first, __last), this }; 436 } 437 438 iterator 439 insert_after(const_iterator __pos, std::initializer_list<_Tp> __il) 440 { 441 __glibcxx_check_insert_after(__pos); 442 return { _Base::insert_after(__pos.base(), __il), this }; 443 } 444 445 private: 446 _Base_iterator 447 _M_erase_after(_Base_const_iterator __pos) 448 { 449 _Base_const_iterator __next = std::next(__pos); 450 this->_M_invalidate_if([__next](_Base_const_iterator __it) 451 { return __it == __next; }); 452 return _Base::erase_after(__pos); 453 } 454 public: 455 iterator 456 erase_after(const_iterator __pos) 457 { 458 __glibcxx_check_erase_after(__pos); 459 return { _M_erase_after(__pos.base()), this }; 460 } 461 462 iterator 463 erase_after(const_iterator __pos, const_iterator __last) 464 { 465 __glibcxx_check_erase_range_after(__pos, __last); 466 for (_Base_const_iterator __victim = std::next(__pos.base()); 467 __victim != __last.base(); ++__victim) 468 { 469 _GLIBCXX_DEBUG_VERIFY(__victim != _Base::cend(), 470 _M_message(__gnu_debug::__msg_valid_range2) 471 ._M_sequence(*this, "this") 472 ._M_iterator(__pos, "pos") 473 ._M_iterator(__last, "last")); 474 this->_M_invalidate_if([__victim](_Base_const_iterator __it) 475 { return __it == __victim; }); 476 } 477 478 return { _Base::erase_after(__pos.base(), __last.base()), this }; 479 } 480 481 void 482 swap(forward_list& __list) 483 noexcept( noexcept(declval<_Base&>().swap(__list)) ) 484 { 485 _Safe::_M_swap(__list); 486 _Base::swap(__list); 487 } 488 489 void 490 resize(size_type __sz) 491 { 492 this->_M_detach_singular(); 493 494 // if __sz < size(), invalidate all iterators in [begin+__sz, end() 495 _Base_iterator __victim = _Base::begin(); 496 _Base_iterator __end = _Base::end(); 497 for (size_type __i = __sz; __victim != __end && __i > 0; --__i) 498 ++__victim; 499 500 for (; __victim != __end; ++__victim) 501 { 502 this->_M_invalidate_if([__victim](_Base_const_iterator __it) 503 { return __it == __victim; }); 504 } 505 506 __try 507 { 508 _Base::resize(__sz); 509 } 510 __catch(...) 511 { 512 this->_M_revalidate_singular(); 513 __throw_exception_again; 514 } 515 } 516 517 void 518 resize(size_type __sz, const value_type& __val) 519 { 520 this->_M_detach_singular(); 521 522 // if __sz < size(), invalidate all iterators in [begin+__sz, end()) 523 _Base_iterator __victim = _Base::begin(); 524 _Base_iterator __end = _Base::end(); 525 for (size_type __i = __sz; __victim != __end && __i > 0; --__i) 526 ++__victim; 527 528 for (; __victim != __end; ++__victim) 529 { 530 this->_M_invalidate_if([__victim](_Base_const_iterator __it) 531 { return __it == __victim; }); 532 } 533 534 __try 535 { 536 _Base::resize(__sz, __val); 537 } 538 __catch(...) 539 { 540 this->_M_revalidate_singular(); 541 __throw_exception_again; 542 } 543 } 544 545 void 546 clear() noexcept 547 { 548 _Base::clear(); 549 this->_M_invalidate_all(); 550 } 551 552 // 23.2.3.5 forward_list operations: 553 void 554 splice_after(const_iterator __pos, forward_list&& __list) 555 { 556 __glibcxx_check_insert_after(__pos); 557 _GLIBCXX_DEBUG_VERIFY(std::__addressof(__list) != this, 558 _M_message(__gnu_debug::__msg_self_splice) 559 ._M_sequence(*this, "this")); 560 _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(), 561 _M_message(__gnu_debug::__msg_splice_alloc) 562 ._M_sequence(*this) 563 ._M_sequence(__list, "__list")); 564 this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it) 565 { 566 return __it != __list._M_base().cbefore_begin() 567 && __it != __list._M_base().end(); 568 }); 569 _Base::splice_after(__pos.base(), std::move(__list._M_base())); 570 } 571 572 void 573 splice_after(const_iterator __pos, forward_list& __list) 574 { splice_after(__pos, std::move(__list)); } 575 576 void 577 splice_after(const_iterator __pos, forward_list&& __list, 578 const_iterator __i) 579 { 580 __glibcxx_check_insert_after(__pos); 581 _GLIBCXX_DEBUG_VERIFY(__i._M_before_dereferenceable(), 582 _M_message(__gnu_debug::__msg_splice_bad) 583 ._M_iterator(__i, "__i")); 584 _GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(std::__addressof(__list)), 585 _M_message(__gnu_debug::__msg_splice_other) 586 ._M_iterator(__i, "__i") 587 ._M_sequence(__list, "__list")); 588 _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(), 589 _M_message(__gnu_debug::__msg_splice_alloc) 590 ._M_sequence(*this) 591 ._M_sequence(__list, "__list")); 592 593 // _GLIBCXX_RESOLVE_LIB_DEFECTS 594 // 250. splicing invalidates iterators 595 _Base_const_iterator __next = std::next(__i.base()); 596 this->_M_transfer_from_if(__list, [__next](_Base_const_iterator __it) 597 { return __it == __next; }); 598 _Base::splice_after(__pos.base(), std::move(__list._M_base()), 599 __i.base()); 600 } 601 602 void 603 splice_after(const_iterator __pos, forward_list& __list, 604 const_iterator __i) 605 { splice_after(__pos, std::move(__list), __i); } 606 607 void 608 splice_after(const_iterator __pos, forward_list&& __list, 609 const_iterator __before, const_iterator __last) 610 { 611 typename __gnu_debug::_Distance_traits<const_iterator>::__type __dist; 612 auto __listptr = std::__addressof(__list); 613 __glibcxx_check_insert_after(__pos); 614 __glibcxx_check_valid_fl_range(__before, __last, __dist); 615 _GLIBCXX_DEBUG_VERIFY(__before._M_attached_to(__listptr), 616 _M_message(__gnu_debug::__msg_splice_other) 617 ._M_sequence(__list, "list") 618 ._M_iterator(__before, "before")); 619 _GLIBCXX_DEBUG_VERIFY(__before._M_dereferenceable() 620 || __before._M_is_before_begin(), 621 _M_message(__gnu_debug::__msg_valid_range2) 622 ._M_sequence(__list, "list") 623 ._M_iterator(__before, "before") 624 ._M_iterator(__last, "last")); 625 _GLIBCXX_DEBUG_VERIFY(__before != __last, 626 _M_message(__gnu_debug::__msg_valid_range2) 627 ._M_sequence(__list, "list") 628 ._M_iterator(__before, "before") 629 ._M_iterator(__last, "last")); 630 _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(), 631 _M_message(__gnu_debug::__msg_splice_alloc) 632 ._M_sequence(*this) 633 ._M_sequence(__list, "__list")); 634 635 for (_Base_const_iterator __tmp = std::next(__before.base()); 636 __tmp != __last.base(); ++__tmp) 637 { 638 _GLIBCXX_DEBUG_VERIFY(__tmp != __list._M_base().end(), 639 _M_message(__gnu_debug::__msg_valid_range2) 640 ._M_sequence(__list, "list") 641 ._M_iterator(__before, "before") 642 ._M_iterator(__last, "last")); 643 _GLIBCXX_DEBUG_VERIFY(__listptr != this || __tmp != __pos.base(), 644 _M_message(__gnu_debug::__msg_splice_overlap) 645 ._M_iterator(__tmp, "position") 646 ._M_iterator(__before, "before") 647 ._M_iterator(__last, "last")); 648 // _GLIBCXX_RESOLVE_LIB_DEFECTS 649 // 250. splicing invalidates iterators 650 this->_M_transfer_from_if(__list, [__tmp](_Base_const_iterator __it) 651 { return __it == __tmp; }); 652 } 653 654 _Base::splice_after(__pos.base(), std::move(__list._M_base()), 655 __before.base(), __last.base()); 656 } 657 658 void 659 splice_after(const_iterator __pos, forward_list& __list, 660 const_iterator __before, const_iterator __last) 661 { splice_after(__pos, std::move(__list), __before, __last); } 662 663 private: 664#if __cplusplus > 201703L 665 using __remove_return_type = size_type; 666# define _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG \ 667 __attribute__((__abi_tag__("__cxx20"))) 668# define _GLIBCXX20_ONLY(__expr) __expr 669#else 670 using __remove_return_type = void; 671# define _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG 672# define _GLIBCXX20_ONLY(__expr) 673#endif 674 675 public: 676 _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG 677 __remove_return_type 678 remove(const _Tp& __val) 679 { 680 if (!this->_M_iterators && !this->_M_const_iterators) 681 return _Base::remove(__val); 682 683 size_type __removed __attribute__((__unused__)) = 0; 684 _Base_iterator __x = _Base::before_begin(); 685 _Base_iterator __old = __x++; 686 _Base_iterator __extra = _Base::end(); 687 while (__x != _Base::end()) 688 { 689 if (*__x == __val) 690 { 691 if (std::__addressof(*__x) != std::__addressof(__val)) 692 { 693 __x = _M_erase_after(__old); 694 _GLIBCXX20_ONLY( __removed++ ); 695 continue; 696 } 697 else 698 __extra = __old; 699 } 700 __old = __x++; 701 } 702 703 if (__extra != _Base::end()) 704 { 705 this->_M_erase_after(__extra); 706 _GLIBCXX20_ONLY( __removed++ ); 707 } 708 709 return _GLIBCXX20_ONLY( __removed ); 710 } 711 712 template<typename _Pred> 713 __remove_return_type 714 remove_if(_Pred __pred) 715 { 716 if (!this->_M_iterators && !this->_M_const_iterators) 717 return _Base::remove_if(__pred); 718 719 size_type __removed __attribute__((__unused__)) = 0; 720 _Base_iterator __x = _Base::before_begin(); 721 _Base_iterator __old = __x++; 722 while (__x != _Base::end()) 723 if (__pred(*__x)) 724 { 725 __x = _M_erase_after(__old); 726 _GLIBCXX20_ONLY( __removed++ ); 727 } 728 else 729 __old = __x++; 730 731 return _GLIBCXX20_ONLY( __removed ); 732 } 733 734 _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG 735 __remove_return_type 736 unique() 737 { return unique(std::equal_to<_Tp>()); } 738 739 template<typename _BinPred> 740 __remove_return_type 741 unique(_BinPred __binary_pred) 742 { 743 if (!this->_M_iterators && !this->_M_const_iterators) 744 return _Base::unique(__binary_pred); 745 746 _Base_iterator __first = _Base::begin(); 747 _Base_iterator __last = _Base::end(); 748 if (__first == __last) 749 return _GLIBCXX20_ONLY(0); 750 751 size_type __removed __attribute__((__unused__)) = 0; 752 _Base_iterator __next = std::next(__first); 753 while (__next != __last) 754 { 755 if (__binary_pred(*__first, *__next)) 756 { 757 __next = _M_erase_after(__first); 758 _GLIBCXX20_ONLY( __removed++ ); 759 } 760 else 761 __first = __next++; 762 } 763 764 return _GLIBCXX20_ONLY( __removed ); 765 } 766 767#undef _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG 768#undef _GLIBCXX20_ONLY 769 770 void 771 merge(forward_list&& __list) 772 { 773 if (this != std::__addressof(__list)) 774 { 775 __glibcxx_check_sorted(_Base::begin(), _Base::end()); 776 __glibcxx_check_sorted(__list._M_base().begin(), 777 __list._M_base().end()); 778 this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it) 779 { 780 return __it != __list._M_base().cbefore_begin() 781 && __it != __list._M_base().cend(); 782 }); 783 _Base::merge(std::move(__list._M_base())); 784 } 785 } 786 787 void 788 merge(forward_list& __list) 789 { merge(std::move(__list)); } 790 791 template<typename _Comp> 792 void 793 merge(forward_list&& __list, _Comp __comp) 794 { 795 if (this != std::__addressof(__list)) 796 { 797 __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(), __comp); 798 __glibcxx_check_sorted_pred(__list._M_base().begin(), 799 __list._M_base().end(), __comp); 800 this->_M_transfer_from_if(__list, 801 [&__list](_Base_const_iterator __it) 802 { 803 return __it != __list._M_base().cbefore_begin() 804 && __it != __list._M_base().cend(); 805 }); 806 _Base::merge(std::move(__list._M_base()), __comp); 807 } 808 } 809 810 template<typename _Comp> 811 void 812 merge(forward_list& __list, _Comp __comp) 813 { merge(std::move(__list), __comp); } 814 815 using _Base::sort; 816 using _Base::reverse; 817 818 _Base& 819 _M_base() noexcept { return *this; } 820 821 const _Base& 822 _M_base() const noexcept { return *this; } 823 }; 824 825#if __cpp_deduction_guides >= 201606 826 template<typename _InputIterator, typename _ValT 827 = typename iterator_traits<_InputIterator>::value_type, 828 typename _Allocator = allocator<_ValT>, 829 typename = _RequireInputIter<_InputIterator>, 830 typename = _RequireAllocator<_Allocator>> 831 forward_list(_InputIterator, _InputIterator, _Allocator = _Allocator()) 832 -> forward_list<_ValT, _Allocator>; 833#endif 834 835 template<typename _Tp, typename _Alloc> 836 bool 837 operator==(const forward_list<_Tp, _Alloc>& __lx, 838 const forward_list<_Tp, _Alloc>& __ly) 839 { return __lx._M_base() == __ly._M_base(); } 840 841#if __cpp_lib_three_way_comparison 842 template<typename _Tp, typename _Alloc> 843 constexpr __detail::__synth3way_t<_Tp> 844 operator<=>(const forward_list<_Tp, _Alloc>& __x, 845 const forward_list<_Tp, _Alloc>& __y) 846 { return __x._M_base() <=> __y._M_base(); } 847#else 848 template<typename _Tp, typename _Alloc> 849 inline bool 850 operator<(const forward_list<_Tp, _Alloc>& __lx, 851 const forward_list<_Tp, _Alloc>& __ly) 852 { return __lx._M_base() < __ly._M_base(); } 853 854 template<typename _Tp, typename _Alloc> 855 inline bool 856 operator!=(const forward_list<_Tp, _Alloc>& __lx, 857 const forward_list<_Tp, _Alloc>& __ly) 858 { return !(__lx == __ly); } 859 860 /// Based on operator< 861 template<typename _Tp, typename _Alloc> 862 inline bool 863 operator>(const forward_list<_Tp, _Alloc>& __lx, 864 const forward_list<_Tp, _Alloc>& __ly) 865 { return (__ly < __lx); } 866 867 /// Based on operator< 868 template<typename _Tp, typename _Alloc> 869 inline bool 870 operator>=(const forward_list<_Tp, _Alloc>& __lx, 871 const forward_list<_Tp, _Alloc>& __ly) 872 { return !(__lx < __ly); } 873 874 /// Based on operator< 875 template<typename _Tp, typename _Alloc> 876 inline bool 877 operator<=(const forward_list<_Tp, _Alloc>& __lx, 878 const forward_list<_Tp, _Alloc>& __ly) 879 { return !(__ly < __lx); } 880#endif // three-way comparison 881 882 /// See std::forward_list::swap(). 883 template<typename _Tp, typename _Alloc> 884 inline void 885 swap(forward_list<_Tp, _Alloc>& __lx, forward_list<_Tp, _Alloc>& __ly) 886 noexcept(noexcept(__lx.swap(__ly))) 887 { __lx.swap(__ly); } 888 889} // namespace __debug 890} // namespace std 891 892namespace __gnu_debug 893{ 894 template<typename _Tp, typename _Alloc> 895 struct _BeforeBeginHelper<std::__debug::forward_list<_Tp, _Alloc> > 896 { 897 typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence; 898 899 template<typename _Iterator> 900 static bool 901 _S_Is(const _Safe_iterator<_Iterator, _Sequence>& __it) 902 { 903 return 904 __it.base() == __it._M_get_sequence()->_M_base().before_begin(); 905 } 906 907 template<typename _Iterator> 908 static bool 909 _S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence>& __it) 910 { return _S_Is(__it); } 911 }; 912 913 template<typename _Tp, typename _Alloc> 914 struct _Sequence_traits<std::__debug::forward_list<_Tp, _Alloc> > 915 { 916 typedef typename std::__debug::forward_list<_Tp, _Alloc>::iterator _It; 917 918 static typename _Distance_traits<_It>::__type 919 _S_size(const std::__debug::forward_list<_Tp, _Alloc>& __seq) 920 { 921 return __seq.empty() 922 ? std::make_pair(0, __dp_exact) : std::make_pair(1, __dp_sign); 923 } 924 }; 925 926#ifndef _GLIBCXX_DEBUG_PEDANTIC 927 template<class _Tp, class _Alloc> 928 struct _Insert_range_from_self_is_safe< 929 std::__debug::forward_list<_Tp, _Alloc> > 930 { enum { __value = 1 }; }; 931#endif 932} 933 934#endif 935