libstdc++
forward_list
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00001 // <forward_list> -*- C++ -*-
00002 
00003 // Copyright (C) 2010-2016 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file debug/forward_list
00026  *  This file is a GNU debug extension to the Standard C++ Library.
00027  */
00028 
00029 #ifndef _GLIBCXX_DEBUG_FORWARD_LIST
00030 #define _GLIBCXX_DEBUG_FORWARD_LIST 1
00031 
00032 #pragma GCC system_header
00033 
00034 #include <forward_list>
00035 #include <debug/safe_sequence.h>
00036 #include <debug/safe_container.h>
00037 #include <debug/safe_iterator.h>
00038 
00039 // Special validity check for forward_list ranges.
00040 #define __glibcxx_check_valid_fl_range(_First,_Last,_Dist)              \
00041 _GLIBCXX_DEBUG_VERIFY(_First._M_valid_range(_Last, _Dist, false),       \
00042                       _M_message(__gnu_debug::__msg_valid_range)        \
00043                       ._M_iterator(_First, #_First)                     \
00044                       ._M_iterator(_Last, #_Last))
00045 
00046 namespace __gnu_debug
00047 {
00048   /// Special iterators swap and invalidation for forward_list because of the
00049   /// before_begin iterator.
00050   template<typename _SafeSequence>
00051     class _Safe_forward_list
00052     : public _Safe_sequence<_SafeSequence>
00053     {
00054       _SafeSequence&
00055       _M_this() noexcept
00056       { return *static_cast<_SafeSequence*>(this); }
00057 
00058       static void
00059       _M_swap_aux(_Safe_sequence_base& __lhs,
00060                   _Safe_iterator_base*& __lhs_iterators,
00061                   _Safe_sequence_base& __rhs,
00062                   _Safe_iterator_base*& __rhs_iterators);
00063 
00064       void _M_swap_single(_Safe_sequence_base&) noexcept;
00065 
00066     protected:
00067       void
00068       _M_invalidate_all()
00069       {
00070         using _Base_const_iterator = __decltype(_M_this()._M_base().cend());
00071         this->_M_invalidate_if([this](_Base_const_iterator __it)
00072         {
00073           return __it != _M_this()._M_base().cbefore_begin()
00074             && __it != _M_this()._M_base().cend(); });
00075       }
00076 
00077       void _M_swap(_Safe_sequence_base&) noexcept;
00078     };
00079 
00080    template<typename _SafeSequence>
00081     void
00082     _Safe_forward_list<_SafeSequence>::
00083     _M_swap_aux(_Safe_sequence_base& __lhs,
00084                 _Safe_iterator_base*& __lhs_iterators,
00085                 _Safe_sequence_base& __rhs,
00086                 _Safe_iterator_base*& __rhs_iterators)
00087     {
00088       using const_iterator = typename _SafeSequence::const_iterator;
00089       _Safe_iterator_base* __bbegin_its = 0;
00090       _Safe_iterator_base* __last_bbegin = 0;
00091       _SafeSequence& __rseq = static_cast<_SafeSequence&>(__rhs);
00092 
00093       for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;)
00094         {
00095           // Even iterator is cast to const_iterator, not a problem.
00096           _Safe_iterator_base* __victim_base = __iter;
00097           const_iterator* __victim =
00098             static_cast<const_iterator*>(__victim_base);
00099           __iter = __iter->_M_next;
00100           if (__victim->base() == __rseq._M_base().cbefore_begin())
00101             {
00102               __victim->_M_unlink();
00103               if (__lhs_iterators == __victim_base)
00104                 __lhs_iterators = __victim_base->_M_next;
00105               if (__bbegin_its)
00106                 {
00107                   __victim_base->_M_next = __bbegin_its;
00108                   __bbegin_its->_M_prior = __victim_base;
00109                 }
00110               else
00111                 __last_bbegin = __victim_base;
00112               __bbegin_its = __victim_base;
00113             }
00114           else
00115             __victim_base->_M_sequence = std::__addressof(__lhs);
00116         }
00117 
00118       if (__bbegin_its)
00119         {
00120           if (__rhs_iterators)
00121             {
00122               __rhs_iterators->_M_prior = __last_bbegin;
00123               __last_bbegin->_M_next = __rhs_iterators;
00124             }
00125           __rhs_iterators = __bbegin_its;
00126         }
00127     }
00128 
00129    template<typename _SafeSequence>
00130     void
00131     _Safe_forward_list<_SafeSequence>::
00132     _M_swap_single(_Safe_sequence_base& __other) noexcept
00133     {
00134       std::swap(_M_this()._M_iterators, __other._M_iterators);
00135       std::swap(_M_this()._M_const_iterators, __other._M_const_iterators);
00136       // Useless, always 1 on forward_list
00137       //std::swap(_M_this()_M_version, __other._M_version);
00138       _Safe_iterator_base* __this_its = _M_this()._M_iterators;
00139       _M_swap_aux(__other, __other._M_iterators,
00140                   _M_this(), _M_this()._M_iterators);
00141       _Safe_iterator_base* __this_const_its = _M_this()._M_const_iterators;
00142       _M_swap_aux(__other, __other._M_const_iterators,
00143                   _M_this(), _M_this()._M_const_iterators);
00144       _M_swap_aux(_M_this(), __this_its,
00145                   __other, __other._M_iterators);
00146       _M_swap_aux(_M_this(), __this_const_its,
00147                   __other, __other._M_const_iterators);
00148     }
00149 
00150   /* Special forward_list _M_swap version that does not swap the
00151    * before-begin ownership.*/
00152    template<typename _SafeSequence>
00153     void
00154     _Safe_forward_list<_SafeSequence>::
00155     _M_swap(_Safe_sequence_base& __other) noexcept
00156     {
00157       // We need to lock both sequences to swap
00158       using namespace __gnu_cxx;
00159       __mutex *__this_mutex = &_M_this()._M_get_mutex();
00160       __mutex *__other_mutex =
00161         &static_cast<_SafeSequence&>(__other)._M_get_mutex();
00162       if (__this_mutex == __other_mutex)
00163         {
00164           __scoped_lock __lock(*__this_mutex);
00165           _M_swap_single(__other);
00166         }
00167       else
00168         {
00169           __scoped_lock __l1(__this_mutex < __other_mutex
00170                              ? *__this_mutex : *__other_mutex);
00171           __scoped_lock __l2(__this_mutex < __other_mutex
00172                              ? *__other_mutex : *__this_mutex);
00173           _M_swap_single(__other);
00174         }
00175     }
00176 }
00177 
00178 namespace std _GLIBCXX_VISIBILITY(default)
00179 {
00180 namespace __debug
00181 {
00182   /// Class std::forward_list with safety/checking/debug instrumentation.
00183   template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
00184     class forward_list
00185     : public __gnu_debug::_Safe_container<
00186         forward_list<_Tp, _Alloc>, _Alloc, __gnu_debug::_Safe_forward_list>,
00187       public _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>
00188     {
00189       typedef _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>         _Base;
00190       typedef __gnu_debug::_Safe_container<
00191         forward_list, _Alloc, __gnu_debug::_Safe_forward_list>  _Safe;
00192 
00193       typedef typename _Base::iterator          _Base_iterator;
00194       typedef typename _Base::const_iterator    _Base_const_iterator;
00195 
00196     public:
00197       typedef typename _Base::reference         reference;
00198       typedef typename _Base::const_reference   const_reference;
00199 
00200       typedef __gnu_debug::_Safe_iterator<
00201         _Base_iterator, forward_list>           iterator;
00202       typedef __gnu_debug::_Safe_iterator<
00203         _Base_const_iterator, forward_list>     const_iterator;
00204 
00205       typedef typename _Base::size_type         size_type;
00206       typedef typename _Base::difference_type   difference_type;
00207 
00208       typedef _Tp                               value_type;
00209       typedef typename _Base::allocator_type    allocator_type;
00210       typedef typename _Base::pointer           pointer;
00211       typedef typename _Base::const_pointer     const_pointer;
00212 
00213       // 23.2.3.1 construct/copy/destroy:
00214 
00215       forward_list() = default;
00216 
00217       explicit
00218       forward_list(const allocator_type& __al) noexcept
00219       : _Base(__al) { }
00220 
00221       forward_list(const forward_list& __list, const allocator_type& __al)
00222       : _Base(__list, __al)
00223       { }
00224 
00225       forward_list(forward_list&& __list, const allocator_type& __al)
00226         : _Safe(std::move(__list._M_safe()), __al),
00227           _Base(std::move(__list._M_base()), __al)
00228       { }
00229 
00230       explicit
00231       forward_list(size_type __n, const allocator_type& __al = allocator_type())
00232       : _Base(__n, __al)
00233       { }
00234 
00235       forward_list(size_type __n, const _Tp& __value,
00236                    const allocator_type& __al = allocator_type())
00237       : _Base(__n, __value, __al)
00238       { }
00239 
00240       template<typename _InputIterator,
00241                typename = std::_RequireInputIter<_InputIterator>>
00242         forward_list(_InputIterator __first, _InputIterator __last,
00243                      const allocator_type& __al = allocator_type())
00244         : _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
00245                                                                      __last)),
00246                 __gnu_debug::__base(__last), __al)
00247         { }
00248 
00249       forward_list(const forward_list&) = default;
00250 
00251       forward_list(forward_list&&) = default;
00252 
00253       forward_list(std::initializer_list<_Tp> __il,
00254                    const allocator_type& __al = allocator_type())
00255       : _Base(__il, __al)
00256       { }
00257 
00258       ~forward_list() = default;
00259 
00260       forward_list&
00261       operator=(const forward_list&) = default;
00262 
00263       forward_list&
00264       operator=(forward_list&&) = default;
00265 
00266       forward_list&
00267       operator=(std::initializer_list<_Tp> __il)
00268       {
00269         _M_base() = __il;
00270         this->_M_invalidate_all();
00271         return *this;
00272       }
00273 
00274       template<typename _InputIterator,
00275                typename = std::_RequireInputIter<_InputIterator>>
00276         void
00277         assign(_InputIterator __first, _InputIterator __last)
00278         {
00279           typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
00280           __glibcxx_check_valid_range2(__first, __last, __dist);
00281 
00282           if (__dist.second >= __gnu_debug::__dp_sign)
00283             _Base::assign(__gnu_debug::__unsafe(__first),
00284                           __gnu_debug::__unsafe(__last));
00285           else
00286             _Base::assign(__first, __last);
00287 
00288           this->_M_invalidate_all();
00289         }
00290 
00291       void
00292       assign(size_type __n, const _Tp& __val)
00293       {
00294         _Base::assign(__n, __val);
00295         this->_M_invalidate_all();
00296       }
00297 
00298       void
00299       assign(std::initializer_list<_Tp> __il)
00300       {
00301         _Base::assign(__il);
00302         this->_M_invalidate_all();
00303       }
00304 
00305       using _Base::get_allocator;
00306 
00307       // iterators:
00308 
00309       iterator
00310       before_begin() noexcept
00311       { return iterator(_Base::before_begin(), this); }
00312 
00313       const_iterator
00314       before_begin() const noexcept
00315       { return const_iterator(_Base::before_begin(), this); }
00316 
00317       iterator
00318       begin() noexcept
00319       { return iterator(_Base::begin(), this); }
00320 
00321       const_iterator
00322       begin() const noexcept
00323       { return const_iterator(_Base::begin(), this); }
00324 
00325       iterator
00326       end() noexcept
00327       { return iterator(_Base::end(), this); }
00328 
00329       const_iterator
00330       end() const noexcept
00331       { return const_iterator(_Base::end(), this); }
00332 
00333       const_iterator
00334       cbegin() const noexcept
00335       { return const_iterator(_Base::cbegin(), this); }
00336 
00337       const_iterator
00338       cbefore_begin() const noexcept
00339       { return const_iterator(_Base::cbefore_begin(), this); }
00340 
00341       const_iterator
00342       cend() const noexcept
00343       { return const_iterator(_Base::cend(), this); }
00344 
00345       using _Base::empty;
00346       using _Base::max_size;
00347 
00348       // element access:
00349 
00350       reference
00351       front()
00352       {
00353         __glibcxx_check_nonempty();
00354         return _Base::front();
00355       }
00356 
00357       const_reference
00358       front() const
00359       {
00360         __glibcxx_check_nonempty();
00361         return _Base::front();
00362       }
00363 
00364       // modifiers:
00365 
00366       using _Base::emplace_front;
00367       using _Base::push_front;
00368 
00369       void
00370       pop_front()
00371       {
00372         __glibcxx_check_nonempty();
00373         this->_M_invalidate_if([this](_Base_const_iterator __it)
00374           { return __it == this->_M_base().cbegin(); });
00375         _Base::pop_front();
00376       }
00377 
00378       template<typename... _Args>
00379         iterator
00380         emplace_after(const_iterator __pos, _Args&&... __args)
00381         {
00382           __glibcxx_check_insert_after(__pos);
00383           return iterator(_Base::emplace_after(__pos.base(),
00384                                         std::forward<_Args>(__args)...),
00385                           this);
00386         }
00387 
00388       iterator
00389       insert_after(const_iterator __pos, const _Tp& __val)
00390       {
00391         __glibcxx_check_insert_after(__pos);
00392         return iterator(_Base::insert_after(__pos.base(), __val), this);
00393       }
00394 
00395       iterator
00396       insert_after(const_iterator __pos, _Tp&& __val)
00397       {
00398         __glibcxx_check_insert_after(__pos);
00399         return iterator(_Base::insert_after(__pos.base(), std::move(__val)),
00400                         this);
00401       }
00402 
00403       iterator
00404       insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
00405       {
00406         __glibcxx_check_insert_after(__pos);
00407         return iterator(_Base::insert_after(__pos.base(), __n, __val),
00408                         this);
00409       }
00410 
00411       template<typename _InputIterator,
00412                typename = std::_RequireInputIter<_InputIterator>>
00413         iterator
00414         insert_after(const_iterator __pos,
00415                      _InputIterator __first, _InputIterator __last)
00416         {
00417           typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
00418           __glibcxx_check_insert_range_after(__pos, __first, __last, __dist);
00419 
00420           if (__dist.second >= __gnu_debug::__dp_sign)
00421             return
00422               {
00423                 _Base::insert_after(__pos.base(),
00424                                     __gnu_debug::__unsafe(__first),
00425                                     __gnu_debug::__unsafe(__last)),
00426                 this
00427               };
00428           else
00429             return { _Base::insert_after(__pos.base(), __first, __last), this };
00430         }
00431 
00432       iterator
00433       insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)
00434       {
00435         __glibcxx_check_insert_after(__pos);
00436         return iterator(_Base::insert_after(__pos.base(), __il), this);
00437       }
00438 
00439     private:
00440       _Base_iterator
00441       _M_erase_after(_Base_const_iterator __pos)
00442       {
00443         _Base_const_iterator __next = std::next(__pos);
00444         this->_M_invalidate_if([__next](_Base_const_iterator __it)
00445           { return __it == __next; });
00446         return _Base::erase_after(__pos);
00447       }
00448     public:
00449       iterator
00450       erase_after(const_iterator __pos)
00451       {
00452         __glibcxx_check_erase_after(__pos);
00453         return iterator(_M_erase_after(__pos.base()), this);
00454       }
00455 
00456       iterator
00457       erase_after(const_iterator __pos, const_iterator __last)
00458       {
00459         __glibcxx_check_erase_range_after(__pos, __last);
00460         for (_Base_const_iterator __victim = std::next(__pos.base());
00461             __victim != __last.base(); ++__victim)
00462           {
00463             _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
00464                                   _M_message(__gnu_debug::__msg_valid_range2)
00465                                   ._M_sequence(*this, "this")
00466                                   ._M_iterator(__pos, "pos")
00467                                   ._M_iterator(__last, "last"));
00468             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00469               { return __it == __victim; });
00470           }
00471         return iterator(_Base::erase_after(__pos.base(), __last.base()), this);
00472       }
00473 
00474       void
00475       swap(forward_list& __list)
00476         noexcept( noexcept(declval<_Base&>().swap(__list)) )
00477       {
00478         _Safe::_M_swap(__list);
00479         _Base::swap(__list);
00480       }
00481 
00482       void
00483       resize(size_type __sz)
00484       {
00485         this->_M_detach_singular();
00486 
00487         // if __sz < size(), invalidate all iterators in [begin+__sz, end()
00488         _Base_iterator __victim = _Base::begin();
00489         _Base_iterator __end = _Base::end();
00490         for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
00491           ++__victim;
00492 
00493         for (; __victim != __end; ++__victim)
00494           {
00495             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00496               { return __it == __victim; });
00497           }
00498 
00499         __try
00500           {
00501             _Base::resize(__sz);
00502           }
00503         __catch(...)
00504           {
00505             this->_M_revalidate_singular();
00506             __throw_exception_again;
00507           }
00508       }
00509 
00510       void
00511       resize(size_type __sz, const value_type& __val)
00512       {
00513         this->_M_detach_singular();
00514 
00515         // if __sz < size(), invalidate all iterators in [begin+__sz, end())
00516         _Base_iterator __victim = _Base::begin();
00517         _Base_iterator __end = _Base::end();
00518         for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
00519           ++__victim;
00520 
00521         for (; __victim != __end; ++__victim)
00522           {
00523             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00524               { return __it == __victim; });
00525           }
00526 
00527         __try
00528           {
00529             _Base::resize(__sz, __val);
00530           }
00531         __catch(...)
00532           {
00533             this->_M_revalidate_singular();
00534             __throw_exception_again;
00535           }
00536       }
00537 
00538       void
00539       clear() noexcept
00540       {
00541         _Base::clear();
00542         this->_M_invalidate_all();
00543       }
00544 
00545       // 23.2.3.5 forward_list operations:
00546       void
00547       splice_after(const_iterator __pos, forward_list&& __list)
00548       {
00549         __glibcxx_check_insert_after(__pos);
00550         _GLIBCXX_DEBUG_VERIFY(std::__addressof(__list) != this,
00551                               _M_message(__gnu_debug::__msg_self_splice)
00552                               ._M_sequence(*this, "this"));
00553         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00554                               _M_message(__gnu_debug::__msg_splice_alloc)
00555                               ._M_sequence(*this)
00556                               ._M_sequence(__list, "__list"));
00557         this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
00558           {
00559             return __it != __list._M_base().cbefore_begin()
00560                    && __it != __list._M_base().end();
00561           });
00562         _Base::splice_after(__pos.base(), std::move(__list._M_base()));
00563       }
00564 
00565       void
00566       splice_after(const_iterator __pos, forward_list& __list)
00567       { splice_after(__pos, std::move(__list)); }
00568 
00569       void
00570       splice_after(const_iterator __pos, forward_list&& __list,
00571                    const_iterator __i)
00572       {
00573         __glibcxx_check_insert_after(__pos);
00574         _GLIBCXX_DEBUG_VERIFY(__i._M_before_dereferenceable(),
00575                               _M_message(__gnu_debug::__msg_splice_bad)
00576                               ._M_iterator(__i, "__i"));
00577         _GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(std::__addressof(__list)),
00578                               _M_message(__gnu_debug::__msg_splice_other)
00579                               ._M_iterator(__i, "__i")
00580                               ._M_sequence(__list, "__list"));
00581         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00582                               _M_message(__gnu_debug::__msg_splice_alloc)
00583                               ._M_sequence(*this)
00584                               ._M_sequence(__list, "__list"));
00585 
00586         // _GLIBCXX_RESOLVE_LIB_DEFECTS
00587         // 250. splicing invalidates iterators
00588         _Base_const_iterator __next = std::next(__i.base());
00589         this->_M_transfer_from_if(__list, [__next](_Base_const_iterator __it)
00590           { return __it == __next; });
00591         _Base::splice_after(__pos.base(), std::move(__list._M_base()),
00592                             __i.base());
00593       }
00594 
00595       void
00596       splice_after(const_iterator __pos, forward_list& __list,
00597                    const_iterator __i)
00598       { splice_after(__pos, std::move(__list), __i); }
00599 
00600       void
00601       splice_after(const_iterator __pos, forward_list&& __list,
00602                    const_iterator __before, const_iterator __last)
00603       {
00604         typename __gnu_debug::_Distance_traits<const_iterator>::__type __dist;
00605         auto __listptr = std::__addressof(__list);
00606         __glibcxx_check_insert_after(__pos);
00607         __glibcxx_check_valid_fl_range(__before, __last, __dist);
00608         _GLIBCXX_DEBUG_VERIFY(__before._M_attached_to(__listptr),
00609                               _M_message(__gnu_debug::__msg_splice_other)
00610                               ._M_sequence(__list, "list")
00611                               ._M_iterator(__before, "before"));
00612         _GLIBCXX_DEBUG_VERIFY(__before._M_dereferenceable()
00613                               || __before._M_is_before_begin(),
00614                               _M_message(__gnu_debug::__msg_valid_range2)
00615                               ._M_sequence(__list, "list")
00616                               ._M_iterator(__before, "before")
00617                               ._M_iterator(__last, "last"));
00618         _GLIBCXX_DEBUG_VERIFY(__before != __last,
00619                               _M_message(__gnu_debug::__msg_valid_range2)
00620                               ._M_sequence(__list, "list")
00621                               ._M_iterator(__before, "before")
00622                               ._M_iterator(__last, "last"));
00623         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00624                               _M_message(__gnu_debug::__msg_splice_alloc)
00625                               ._M_sequence(*this)
00626                               ._M_sequence(__list, "__list"));
00627 
00628         for (_Base_const_iterator __tmp = std::next(__before.base());
00629              __tmp != __last.base(); ++__tmp)
00630           {
00631             _GLIBCXX_DEBUG_VERIFY(__tmp != __list._M_base().end(),
00632                                   _M_message(__gnu_debug::__msg_valid_range2)
00633                                   ._M_sequence(__list, "list")
00634                                   ._M_iterator(__before, "before")
00635                                   ._M_iterator(__last, "last"));
00636             _GLIBCXX_DEBUG_VERIFY(__listptr != this || __tmp != __pos.base(),
00637                                   _M_message(__gnu_debug::__msg_splice_overlap)
00638                                   ._M_iterator(__tmp, "position")
00639                                   ._M_iterator(__before, "before")
00640                                   ._M_iterator(__last, "last"));
00641             // _GLIBCXX_RESOLVE_LIB_DEFECTS
00642             // 250. splicing invalidates iterators
00643             this->_M_transfer_from_if(__list, [__tmp](_Base_const_iterator __it)
00644               { return __it == __tmp; });
00645           }
00646 
00647         _Base::splice_after(__pos.base(), std::move(__list._M_base()),
00648                             __before.base(), __last.base());
00649       }
00650 
00651       void
00652       splice_after(const_iterator __pos, forward_list& __list,
00653                    const_iterator __before, const_iterator __last)
00654       { splice_after(__pos, std::move(__list), __before, __last); }
00655 
00656       void
00657       remove(const _Tp& __val)
00658       {
00659         _Base_iterator __x = _Base::before_begin();
00660         _Base_iterator __old = __x++;
00661         while (__x != _Base::end())
00662           {
00663             if (*__x == __val)
00664               __x = _M_erase_after(__old);
00665             else
00666               __old = __x++;
00667           }
00668       }
00669 
00670       template<typename _Pred>
00671         void
00672         remove_if(_Pred __pred)
00673         {
00674           _Base_iterator __x = _Base::before_begin();
00675           _Base_iterator __old = __x++;
00676           while (__x != _Base::end())
00677             {
00678               if (__pred(*__x))
00679                 __x = _M_erase_after(__old);
00680               else
00681                 __old = __x++;
00682             }
00683         }
00684 
00685       void
00686       unique()
00687       {
00688         _Base_iterator __first = _Base::begin();
00689         _Base_iterator __last = _Base::end();
00690         if (__first == __last)
00691           return;
00692         _Base_iterator __next = std::next(__first);
00693         while (__next != __last)
00694           {
00695             if (*__first == *__next)
00696               __next = _M_erase_after(__first);
00697             else
00698               __first = __next++;
00699           }
00700       }
00701 
00702       template<typename _BinPred>
00703         void
00704         unique(_BinPred __binary_pred)
00705         {
00706           _Base_iterator __first = _Base::begin();
00707           _Base_iterator __last = _Base::end();
00708           if (__first == __last)
00709             return;
00710           _Base_iterator __next = std::next(__first);
00711           while (__next != __last)
00712             {
00713               if (__binary_pred(*__first, *__next))
00714                 __next = _M_erase_after(__first);
00715               else
00716                 __first = __next++;
00717             }
00718         }
00719 
00720       void
00721       merge(forward_list&& __list)
00722       {
00723         if (this != std::__addressof(__list))
00724         {
00725           __glibcxx_check_sorted(_Base::begin(), _Base::end());
00726           __glibcxx_check_sorted(__list._M_base().begin(),
00727                                  __list._M_base().end());
00728           this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
00729             {
00730               return __it != __list._M_base().cbefore_begin()
00731                      && __it != __list._M_base().cend();
00732             });
00733           _Base::merge(std::move(__list._M_base()));
00734         }
00735       }
00736 
00737       void
00738       merge(forward_list& __list)
00739       { merge(std::move(__list)); }
00740 
00741       template<typename _Comp>
00742         void
00743         merge(forward_list&& __list, _Comp __comp)
00744         {
00745           if (this != std::__addressof(__list))
00746           {
00747             __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(), __comp);
00748             __glibcxx_check_sorted_pred(__list._M_base().begin(),
00749                                         __list._M_base().end(), __comp);
00750             this->_M_transfer_from_if(__list,
00751                                       [&__list](_Base_const_iterator __it)
00752               {
00753                 return __it != __list._M_base().cbefore_begin()
00754                        && __it != __list._M_base().cend();
00755               });
00756             _Base::merge(std::move(__list._M_base()), __comp);
00757           }
00758         }
00759 
00760       template<typename _Comp>
00761         void
00762         merge(forward_list& __list, _Comp __comp)
00763         { merge(std::move(__list), __comp); }
00764 
00765       using _Base::sort;
00766       using _Base::reverse;
00767 
00768       _Base&
00769       _M_base() noexcept { return *this; }
00770 
00771       const _Base&
00772       _M_base() const noexcept { return *this; }
00773     };
00774 
00775   template<typename _Tp, typename _Alloc>
00776     bool
00777     operator==(const forward_list<_Tp, _Alloc>& __lx,
00778                const forward_list<_Tp, _Alloc>& __ly)
00779     { return __lx._M_base() == __ly._M_base(); }
00780 
00781   template<typename _Tp, typename _Alloc>
00782     inline bool
00783     operator<(const forward_list<_Tp, _Alloc>& __lx,
00784               const forward_list<_Tp, _Alloc>& __ly)
00785     { return __lx._M_base() < __ly._M_base(); }
00786 
00787   template<typename _Tp, typename _Alloc>
00788     inline bool
00789     operator!=(const forward_list<_Tp, _Alloc>& __lx,
00790                const forward_list<_Tp, _Alloc>& __ly)
00791     { return !(__lx == __ly); }
00792 
00793   /// Based on operator<
00794   template<typename _Tp, typename _Alloc>
00795     inline bool
00796     operator>(const forward_list<_Tp, _Alloc>& __lx,
00797               const forward_list<_Tp, _Alloc>& __ly)
00798     { return (__ly < __lx); }
00799 
00800   /// Based on operator<
00801   template<typename _Tp, typename _Alloc>
00802     inline bool
00803     operator>=(const forward_list<_Tp, _Alloc>& __lx,
00804                const forward_list<_Tp, _Alloc>& __ly)
00805     { return !(__lx < __ly); }
00806 
00807   /// Based on operator<
00808   template<typename _Tp, typename _Alloc>
00809     inline bool
00810     operator<=(const forward_list<_Tp, _Alloc>& __lx,
00811                const forward_list<_Tp, _Alloc>& __ly)
00812     { return !(__ly < __lx); }
00813 
00814   /// See std::forward_list::swap().
00815   template<typename _Tp, typename _Alloc>
00816     inline void
00817     swap(forward_list<_Tp, _Alloc>& __lx, forward_list<_Tp, _Alloc>& __ly)
00818     noexcept(noexcept(__lx.swap(__ly)))
00819     { __lx.swap(__ly); }
00820 
00821 } // namespace __debug
00822 } // namespace std
00823 
00824 namespace __gnu_debug
00825 {
00826   template<typename _Tp, typename _Alloc>
00827     struct _BeforeBeginHelper<std::__debug::forward_list<_Tp, _Alloc> >
00828     {
00829       typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence;
00830 
00831       template<typename _Iterator>
00832         static bool
00833         _S_Is(const _Safe_iterator<_Iterator, _Sequence>& __it)
00834         {
00835           return
00836             __it.base() == __it._M_get_sequence()->_M_base().before_begin();
00837         }
00838 
00839       template<typename _Iterator>
00840         static bool
00841         _S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence>& __it)
00842         { return _S_Is(__it); }
00843     };
00844 
00845   template<typename _Tp, typename _Alloc>
00846     struct _Sequence_traits<std::__debug::forward_list<_Tp, _Alloc> >
00847     {
00848       typedef typename std::__debug::forward_list<_Tp, _Alloc>::iterator _It;
00849 
00850       static typename _Distance_traits<_It>::__type
00851       _S_size(const std::__debug::forward_list<_Tp, _Alloc>& __seq)
00852       {
00853         return __seq.empty()
00854           ? std::make_pair(0, __dp_exact) : std::make_pair(1, __dp_equality);
00855       }
00856     };
00857 
00858 #ifndef _GLIBCXX_DEBUG_PEDANTIC
00859   template<class _Tp, class _Alloc>
00860     struct _Insert_range_from_self_is_safe<
00861       std::__debug::forward_list<_Tp, _Alloc> >
00862     { enum { __value = 1 }; };
00863 #endif
00864 }
00865 
00866 #endif