1 // <forward_list> -*- C++ -*-
3 // Copyright (C) 2010-2019 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file debug/forward_list
26 * This file is a GNU debug extension to the Standard C++ Library.
29 #ifndef _GLIBCXX_DEBUG_FORWARD_LIST
30 #define _GLIBCXX_DEBUG_FORWARD_LIST 1
32 #pragma GCC system_header
34 #include <bits/c++config.h>
35 namespace std _GLIBCXX_VISIBILITY(default) { namespace __debug {
36 template<typename _Tp, typename _Allocator> class forward_list;
37 } } // namespace std::__debug
39 #include <forward_list>
40 #include <debug/safe_sequence.h>
41 #include <debug/safe_container.h>
42 #include <debug/safe_iterator.h>
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))
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>
61 { return *static_cast<_SafeSequence*>(this); }
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);
69 void _M_swap_single(_Safe_sequence_base&) noexcept;
75 using _Base_const_iterator = __decltype(_M_this()._M_base().cend());
76 this->_M_invalidate_if([this](_Base_const_iterator __it)
78 return __it != _M_this()._M_base().cbefore_begin()
79 && __it != _M_this()._M_base().cend(); });
82 void _M_swap(_Safe_sequence_base&) noexcept;
85 template<typename _SafeSequence>
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)
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);
98 for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;)
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())
107 __victim->_M_unlink();
108 if (__lhs_iterators == __victim_base)
109 __lhs_iterators = __victim_base->_M_next;
112 __victim_base->_M_next = __bbegin_its;
113 __bbegin_its->_M_prior = __victim_base;
116 __last_bbegin = __victim_base;
117 __bbegin_its = __victim_base;
120 __victim_base->_M_sequence = std::__addressof(__lhs);
127 __rhs_iterators->_M_prior = __last_bbegin;
128 __last_bbegin->_M_next = __rhs_iterators;
130 __rhs_iterators = __bbegin_its;
134 template<typename _SafeSequence>
136 _Safe_forward_list<_SafeSequence>::
137 _M_swap_single(_Safe_sequence_base& __other) noexcept
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);
155 /* Special forward_list _M_swap version that does not swap the
156 * before-begin ownership.*/
157 template<typename _SafeSequence>
159 _Safe_forward_list<_SafeSequence>::
160 _M_swap(_Safe_sequence_base& __other) noexcept
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)
169 __scoped_lock __lock(*__this_mutex);
170 _M_swap_single(__other);
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);
183 namespace std _GLIBCXX_VISIBILITY(default)
187 /// Class std::forward_list with safety/checking/debug instrumentation.
188 template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
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>
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;
198 typedef typename _Base::iterator _Base_iterator;
199 typedef typename _Base::const_iterator _Base_const_iterator;
201 template<typename _ItT, typename _SeqT, typename _CatT>
202 friend class ::__gnu_debug::_Safe_iterator;
205 typedef typename _Base::reference reference;
206 typedef typename _Base::const_reference const_reference;
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;
213 typedef typename _Base::size_type size_type;
214 typedef typename _Base::difference_type difference_type;
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;
221 // 23.2.3.1 construct/copy/destroy:
223 forward_list() = default;
226 forward_list(const allocator_type& __al) noexcept
229 forward_list(const forward_list& __list, const allocator_type& __al)
230 : _Base(__list, __al)
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)
239 forward_list(size_type __n, const allocator_type& __al = allocator_type())
243 forward_list(size_type __n, const _Tp& __value,
244 const allocator_type& __al = allocator_type())
245 : _Base(__n, __value, __al)
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)
257 forward_list(const forward_list&) = default;
259 forward_list(forward_list&&) = default;
261 forward_list(std::initializer_list<_Tp> __il,
262 const allocator_type& __al = allocator_type())
266 ~forward_list() = default;
269 operator=(const forward_list&) = default;
272 operator=(forward_list&&) = default;
275 operator=(std::initializer_list<_Tp> __il)
278 this->_M_invalidate_all();
282 template<typename _InputIterator,
283 typename = std::_RequireInputIter<_InputIterator>>
285 assign(_InputIterator __first, _InputIterator __last)
287 typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
288 __glibcxx_check_valid_range2(__first, __last, __dist);
290 if (__dist.second >= __gnu_debug::__dp_sign)
291 _Base::assign(__gnu_debug::__unsafe(__first),
292 __gnu_debug::__unsafe(__last));
294 _Base::assign(__first, __last);
296 this->_M_invalidate_all();
300 assign(size_type __n, const _Tp& __val)
302 _Base::assign(__n, __val);
303 this->_M_invalidate_all();
307 assign(std::initializer_list<_Tp> __il)
310 this->_M_invalidate_all();
313 using _Base::get_allocator;
318 before_begin() noexcept
319 { return { _Base::before_begin(), this }; }
322 before_begin() const noexcept
323 { return { _Base::before_begin(), this }; }
327 { return { _Base::begin(), this }; }
330 begin() const noexcept
331 { return { _Base::begin(), this }; }
335 { return { _Base::end(), this }; }
339 { return { _Base::end(), this }; }
342 cbegin() const noexcept
343 { return { _Base::cbegin(), this }; }
346 cbefore_begin() const noexcept
347 { return { _Base::cbefore_begin(), this }; }
350 cend() const noexcept
351 { return { _Base::cend(), this }; }
354 using _Base::max_size;
361 __glibcxx_check_nonempty();
362 return _Base::front();
368 __glibcxx_check_nonempty();
369 return _Base::front();
374 using _Base::emplace_front;
375 using _Base::push_front;
380 __glibcxx_check_nonempty();
381 this->_M_invalidate_if([this](_Base_const_iterator __it)
382 { return __it == this->_M_base().cbegin(); });
386 template<typename... _Args>
388 emplace_after(const_iterator __pos, _Args&&... __args)
390 __glibcxx_check_insert_after(__pos);
391 return { _Base::emplace_after(__pos.base(),
392 std::forward<_Args>(__args)...),
397 insert_after(const_iterator __pos, const _Tp& __val)
399 __glibcxx_check_insert_after(__pos);
400 return { _Base::insert_after(__pos.base(), __val), this };
404 insert_after(const_iterator __pos, _Tp&& __val)
406 __glibcxx_check_insert_after(__pos);
407 return { _Base::insert_after(__pos.base(), std::move(__val)), this };
411 insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
413 __glibcxx_check_insert_after(__pos);
414 return { _Base::insert_after(__pos.base(), __n, __val), this };
417 template<typename _InputIterator,
418 typename = std::_RequireInputIter<_InputIterator>>
420 insert_after(const_iterator __pos,
421 _InputIterator __first, _InputIterator __last)
423 typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
424 __glibcxx_check_insert_range_after(__pos, __first, __last, __dist);
426 if (__dist.second >= __gnu_debug::__dp_sign)
429 _Base::insert_after(__pos.base(),
430 __gnu_debug::__unsafe(__first),
431 __gnu_debug::__unsafe(__last)),
435 return { _Base::insert_after(__pos.base(), __first, __last), this };
439 insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)
441 __glibcxx_check_insert_after(__pos);
442 return { _Base::insert_after(__pos.base(), __il), this };
447 _M_erase_after(_Base_const_iterator __pos)
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);
456 erase_after(const_iterator __pos)
458 __glibcxx_check_erase_after(__pos);
459 return { _M_erase_after(__pos.base()), this };
463 erase_after(const_iterator __pos, const_iterator __last)
465 __glibcxx_check_erase_range_after(__pos, __last);
466 for (_Base_const_iterator __victim = std::next(__pos.base());
467 __victim != __last.base(); ++__victim)
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; });
478 return { _Base::erase_after(__pos.base(), __last.base()), this };
482 swap(forward_list& __list)
483 noexcept( noexcept(declval<_Base&>().swap(__list)) )
485 _Safe::_M_swap(__list);
490 resize(size_type __sz)
492 this->_M_detach_singular();
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)
500 for (; __victim != __end; ++__victim)
502 this->_M_invalidate_if([__victim](_Base_const_iterator __it)
503 { return __it == __victim; });
512 this->_M_revalidate_singular();
513 __throw_exception_again;
518 resize(size_type __sz, const value_type& __val)
520 this->_M_detach_singular();
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)
528 for (; __victim != __end; ++__victim)
530 this->_M_invalidate_if([__victim](_Base_const_iterator __it)
531 { return __it == __victim; });
536 _Base::resize(__sz, __val);
540 this->_M_revalidate_singular();
541 __throw_exception_again;
549 this->_M_invalidate_all();
552 // 23.2.3.5 forward_list operations:
554 splice_after(const_iterator __pos, forward_list&& __list)
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)
563 ._M_sequence(__list, "__list"));
564 this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
566 return __it != __list._M_base().cbefore_begin()
567 && __it != __list._M_base().end();
569 _Base::splice_after(__pos.base(), std::move(__list._M_base()));
573 splice_after(const_iterator __pos, forward_list& __list)
574 { splice_after(__pos, std::move(__list)); }
577 splice_after(const_iterator __pos, forward_list&& __list,
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)
591 ._M_sequence(__list, "__list"));
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()),
603 splice_after(const_iterator __pos, forward_list& __list,
605 { splice_after(__pos, std::move(__list), __i); }
608 splice_after(const_iterator __pos, forward_list&& __list,
609 const_iterator __before, const_iterator __last)
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)
633 ._M_sequence(__list, "__list"));
635 for (_Base_const_iterator __tmp = std::next(__before.base());
636 __tmp != __last.base(); ++__tmp)
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; });
654 _Base::splice_after(__pos.base(), std::move(__list._M_base()),
655 __before.base(), __last.base());
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); }
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
670 using __remove_return_type = void;
671 # define _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
672 # define _GLIBCXX20_ONLY(__expr)
676 _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
678 remove(const _Tp& __val)
680 if (!this->_M_iterators && !this->_M_const_iterators)
681 return _Base::remove(__val);
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())
691 if (std::__addressof(*__x) != std::__addressof(__val))
693 __x = _M_erase_after(__old);
694 _GLIBCXX20_ONLY( __removed++ );
703 if (__extra != _Base::end())
705 this->_M_erase_after(__extra);
706 _GLIBCXX20_ONLY( __removed++ );
709 return _GLIBCXX20_ONLY( __removed );
712 template<typename _Pred>
714 remove_if(_Pred __pred)
716 if (!this->_M_iterators && !this->_M_const_iterators)
717 return _Base::remove_if(__pred);
719 size_type __removed __attribute__((__unused__)) = 0;
720 _Base_iterator __x = _Base::before_begin();
721 _Base_iterator __old = __x++;
722 while (__x != _Base::end())
725 __x = _M_erase_after(__old);
726 _GLIBCXX20_ONLY( __removed++ );
731 return _GLIBCXX20_ONLY( __removed );
734 _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
737 { return unique(std::equal_to<_Tp>()); }
739 template<typename _BinPred>
741 unique(_BinPred __binary_pred)
743 if (!this->_M_iterators && !this->_M_const_iterators)
744 return _Base::unique(__binary_pred);
746 _Base_iterator __first = _Base::begin();
747 _Base_iterator __last = _Base::end();
748 if (__first == __last)
749 return _GLIBCXX20_ONLY(0);
751 size_type __removed __attribute__((__unused__)) = 0;
752 _Base_iterator __next = std::next(__first);
753 while (__next != __last)
755 if (__binary_pred(*__first, *__next))
757 __next = _M_erase_after(__first);
758 _GLIBCXX20_ONLY( __removed++ );
764 return _GLIBCXX20_ONLY( __removed );
767 #undef _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
768 #undef _GLIBCXX20_ONLY
771 merge(forward_list&& __list)
773 if (this != std::__addressof(__list))
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)
780 return __it != __list._M_base().cbefore_begin()
781 && __it != __list._M_base().cend();
783 _Base::merge(std::move(__list._M_base()));
788 merge(forward_list& __list)
789 { merge(std::move(__list)); }
791 template<typename _Comp>
793 merge(forward_list&& __list, _Comp __comp)
795 if (this != std::__addressof(__list))
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)
803 return __it != __list._M_base().cbefore_begin()
804 && __it != __list._M_base().cend();
806 _Base::merge(std::move(__list._M_base()), __comp);
810 template<typename _Comp>
812 merge(forward_list& __list, _Comp __comp)
813 { merge(std::move(__list), __comp); }
816 using _Base::reverse;
819 _M_base() noexcept { return *this; }
822 _M_base() const noexcept { return *this; }
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>;
835 template<typename _Tp, typename _Alloc>
837 operator==(const forward_list<_Tp, _Alloc>& __lx,
838 const forward_list<_Tp, _Alloc>& __ly)
839 { return __lx._M_base() == __ly._M_base(); }
841 template<typename _Tp, typename _Alloc>
843 operator<(const forward_list<_Tp, _Alloc>& __lx,
844 const forward_list<_Tp, _Alloc>& __ly)
845 { return __lx._M_base() < __ly._M_base(); }
847 template<typename _Tp, typename _Alloc>
849 operator!=(const forward_list<_Tp, _Alloc>& __lx,
850 const forward_list<_Tp, _Alloc>& __ly)
851 { return !(__lx == __ly); }
853 /// Based on operator<
854 template<typename _Tp, typename _Alloc>
856 operator>(const forward_list<_Tp, _Alloc>& __lx,
857 const forward_list<_Tp, _Alloc>& __ly)
858 { return (__ly < __lx); }
860 /// Based on operator<
861 template<typename _Tp, typename _Alloc>
863 operator>=(const forward_list<_Tp, _Alloc>& __lx,
864 const forward_list<_Tp, _Alloc>& __ly)
865 { return !(__lx < __ly); }
867 /// Based on operator<
868 template<typename _Tp, typename _Alloc>
870 operator<=(const forward_list<_Tp, _Alloc>& __lx,
871 const forward_list<_Tp, _Alloc>& __ly)
872 { return !(__ly < __lx); }
874 /// See std::forward_list::swap().
875 template<typename _Tp, typename _Alloc>
877 swap(forward_list<_Tp, _Alloc>& __lx, forward_list<_Tp, _Alloc>& __ly)
878 noexcept(noexcept(__lx.swap(__ly)))
881 } // namespace __debug
884 namespace __gnu_debug
886 template<typename _Tp, typename _Alloc>
887 struct _BeforeBeginHelper<std::__debug::forward_list<_Tp, _Alloc> >
889 typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence;
891 template<typename _Iterator>
893 _S_Is(const _Safe_iterator<_Iterator, _Sequence>& __it)
896 __it.base() == __it._M_get_sequence()->_M_base().before_begin();
899 template<typename _Iterator>
901 _S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence>& __it)
902 { return _S_Is(__it); }
905 template<typename _Tp, typename _Alloc>
906 struct _Sequence_traits<std::__debug::forward_list<_Tp, _Alloc> >
908 typedef typename std::__debug::forward_list<_Tp, _Alloc>::iterator _It;
910 static typename _Distance_traits<_It>::__type
911 _S_size(const std::__debug::forward_list<_Tp, _Alloc>& __seq)
914 ? std::make_pair(0, __dp_exact) : std::make_pair(1, __dp_equality);
918 #ifndef _GLIBCXX_DEBUG_PEDANTIC
919 template<class _Tp, class _Alloc>
920 struct _Insert_range_from_self_is_safe<
921 std::__debug::forward_list<_Tp, _Alloc> >
922 { enum { __value = 1 }; };