libstdc++
forward_list
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00001 // <forward_list> -*- C++ -*-
00002 
00003 // Copyright (C) 2010-2015 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 namespace __gnu_debug
00040 {
00041   /// Special iterators swap and invalidation for forward_list because of the
00042   /// before_begin iterator.
00043   template<typename _SafeSequence>
00044     class _Safe_forward_list
00045     : public _Safe_sequence<_SafeSequence>
00046     {
00047       _SafeSequence&
00048       _M_this() noexcept
00049       { return *static_cast<_SafeSequence*>(this); }
00050 
00051       static void
00052       _M_swap_aux(_Safe_sequence_base& __lhs,
00053                   _Safe_iterator_base*& __lhs_iterators,
00054                   _Safe_sequence_base& __rhs,
00055                   _Safe_iterator_base*& __rhs_iterators);
00056 
00057       void _M_swap_single(_Safe_sequence_base&) noexcept;
00058 
00059     protected:
00060       void
00061       _M_invalidate_all()
00062       {
00063         using _Base_const_iterator = __decltype(_M_this()._M_base().cend());
00064         this->_M_invalidate_if([this](_Base_const_iterator __it)
00065         {
00066           return __it != _M_this()._M_base().cbefore_begin()
00067             && __it != _M_this()._M_base().cend(); });
00068       }
00069 
00070       void _M_swap(_Safe_sequence_base&) noexcept;
00071     };
00072 
00073    template<typename _SafeSequence>
00074     void
00075     _Safe_forward_list<_SafeSequence>::
00076     _M_swap_aux(_Safe_sequence_base& __lhs,
00077                 _Safe_iterator_base*& __lhs_iterators,
00078                 _Safe_sequence_base& __rhs,
00079                 _Safe_iterator_base*& __rhs_iterators)
00080     {
00081       using const_iterator = typename _SafeSequence::const_iterator;
00082       _Safe_iterator_base* __bbegin_its = 0;
00083       _Safe_iterator_base* __last_bbegin = 0;
00084       _SafeSequence& __rseq = static_cast<_SafeSequence&>(__rhs);
00085 
00086       for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;)
00087         {
00088           // Even iterator is cast to const_iterator, not a problem.
00089           _Safe_iterator_base* __victim_base = __iter;
00090           const_iterator* __victim =
00091             static_cast<const_iterator*>(__victim_base);
00092           __iter = __iter->_M_next;
00093           if (__victim->base() == __rseq._M_base().cbefore_begin())
00094             {
00095               __victim->_M_unlink();
00096               if (__lhs_iterators == __victim_base)
00097                 __lhs_iterators = __victim_base->_M_next;
00098               if (__bbegin_its)
00099                 {
00100                   __victim_base->_M_next = __bbegin_its;
00101                   __bbegin_its->_M_prior = __victim_base;
00102                 }
00103               else
00104                 __last_bbegin = __victim_base;
00105               __bbegin_its = __victim_base;
00106             }
00107           else
00108             __victim_base->_M_sequence = &__lhs;
00109         }
00110 
00111       if (__bbegin_its)
00112         {
00113           if (__rhs_iterators)
00114             {
00115               __rhs_iterators->_M_prior = __last_bbegin;
00116               __last_bbegin->_M_next = __rhs_iterators;
00117             }
00118           __rhs_iterators = __bbegin_its;
00119         }
00120     }
00121 
00122    template<typename _SafeSequence>
00123     void
00124     _Safe_forward_list<_SafeSequence>::
00125     _M_swap_single(_Safe_sequence_base& __other) noexcept
00126     {
00127       std::swap(_M_this()._M_iterators, __other._M_iterators);
00128       std::swap(_M_this()._M_const_iterators, __other._M_const_iterators);
00129       // Useless, always 1 on forward_list
00130       //std::swap(_M_this()_M_version, __other._M_version);
00131       _Safe_iterator_base* __this_its = _M_this()._M_iterators;
00132       _M_swap_aux(__other, __other._M_iterators,
00133                   _M_this(), _M_this()._M_iterators);
00134       _Safe_iterator_base* __this_const_its = _M_this()._M_const_iterators;
00135       _M_swap_aux(__other, __other._M_const_iterators,
00136                   _M_this(), _M_this()._M_const_iterators);
00137       _M_swap_aux(_M_this(), __this_its,
00138                   __other, __other._M_iterators);
00139       _M_swap_aux(_M_this(), __this_const_its,
00140                   __other, __other._M_const_iterators);
00141     }
00142 
00143   /* Special forward_list _M_swap version that does not swap the
00144    * before-begin ownership.*/
00145    template<typename _SafeSequence>
00146     void
00147     _Safe_forward_list<_SafeSequence>::
00148     _M_swap(_Safe_sequence_base& __other) noexcept
00149     {
00150       // We need to lock both sequences to swap
00151       using namespace __gnu_cxx;
00152       __mutex *__this_mutex = &_M_this()._M_get_mutex();
00153       __mutex *__other_mutex =
00154         &static_cast<_SafeSequence&>(__other)._M_get_mutex();
00155       if (__this_mutex == __other_mutex)
00156         {
00157           __scoped_lock __lock(*__this_mutex);
00158           _M_swap_single(__other);
00159         }
00160       else
00161         {
00162           __scoped_lock __l1(__this_mutex < __other_mutex
00163                              ? *__this_mutex : *__other_mutex);
00164           __scoped_lock __l2(__this_mutex < __other_mutex
00165                              ? *__other_mutex : *__this_mutex);
00166           _M_swap_single(__other);
00167         }
00168     }
00169 }
00170 
00171 namespace std _GLIBCXX_VISIBILITY(default)
00172 {
00173 namespace __debug
00174 {
00175   /// Class std::forward_list with safety/checking/debug instrumentation.
00176   template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
00177     class forward_list
00178     : public __gnu_debug::_Safe_container<
00179         forward_list<_Tp, _Alloc>, _Alloc, __gnu_debug::_Safe_forward_list>,
00180       public _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>
00181     {
00182       typedef _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>         _Base;
00183       typedef __gnu_debug::_Safe_container<
00184         forward_list, _Alloc, __gnu_debug::_Safe_forward_list>  _Safe;
00185 
00186       typedef typename _Base::iterator          _Base_iterator;
00187       typedef typename _Base::const_iterator    _Base_const_iterator;
00188 
00189     public:
00190       typedef typename _Base::reference         reference;
00191       typedef typename _Base::const_reference   const_reference;
00192 
00193       typedef __gnu_debug::_Safe_iterator<
00194         _Base_iterator, forward_list>           iterator;
00195       typedef __gnu_debug::_Safe_iterator<
00196         _Base_const_iterator, forward_list>     const_iterator;
00197 
00198       typedef typename _Base::size_type         size_type;
00199       typedef typename _Base::difference_type   difference_type;
00200 
00201       typedef _Tp                               value_type;
00202       typedef typename _Base::allocator_type    allocator_type;
00203       typedef typename _Base::pointer           pointer;
00204       typedef typename _Base::const_pointer     const_pointer;
00205 
00206       // 23.2.3.1 construct/copy/destroy:
00207       explicit
00208       forward_list(const allocator_type& __al = allocator_type())
00209       : _Base(__al) { }
00210 
00211       forward_list(const forward_list& __list, const allocator_type& __al)
00212       : _Base(__list, __al)
00213       { }
00214 
00215       forward_list(forward_list&& __list, const allocator_type& __al)
00216         : _Safe(std::move(__list._M_safe()), __al),
00217           _Base(std::move(__list._M_base()), __al)
00218       { }
00219 
00220       explicit
00221       forward_list(size_type __n, const allocator_type& __al = allocator_type())
00222       : _Base(__n, __al)
00223       { }
00224 
00225       forward_list(size_type __n, const _Tp& __value,
00226                    const allocator_type& __al = allocator_type())
00227       : _Base(__n, __value, __al)
00228       { }
00229 
00230       template<typename _InputIterator,
00231                typename = std::_RequireInputIter<_InputIterator>>
00232         forward_list(_InputIterator __first, _InputIterator __last,
00233                      const allocator_type& __al = allocator_type())
00234         : _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
00235                                                                      __last)),
00236                 __gnu_debug::__base(__last), __al)
00237         { }
00238 
00239       forward_list(const forward_list&) = default;
00240 
00241       forward_list(forward_list&&) = default;
00242 
00243       forward_list(std::initializer_list<_Tp> __il,
00244                    const allocator_type& __al = allocator_type())
00245       : _Base(__il, __al)
00246       { }
00247 
00248       ~forward_list() = default;
00249 
00250       forward_list&
00251       operator=(const forward_list&) = default;
00252 
00253       forward_list&
00254       operator=(forward_list&&) = default;
00255 
00256       forward_list&
00257       operator=(std::initializer_list<_Tp> __il)
00258       {
00259         _M_base() = __il;
00260         this->_M_invalidate_all();
00261         return *this;
00262       }
00263 
00264       template<typename _InputIterator,
00265                typename = std::_RequireInputIter<_InputIterator>>
00266         void
00267         assign(_InputIterator __first, _InputIterator __last)
00268         {
00269           __glibcxx_check_valid_range(__first, __last);
00270           _Base::assign(__gnu_debug::__base(__first),
00271                         __gnu_debug::__base(__last));
00272           this->_M_invalidate_all();
00273         }
00274 
00275       void
00276       assign(size_type __n, const _Tp& __val)
00277       {
00278         _Base::assign(__n, __val);
00279         this->_M_invalidate_all();
00280       }
00281 
00282       void
00283       assign(std::initializer_list<_Tp> __il)
00284       {
00285         _Base::assign(__il);
00286         this->_M_invalidate_all();
00287       }
00288 
00289       using _Base::get_allocator;
00290 
00291       // iterators:
00292 
00293       iterator
00294       before_begin() noexcept
00295       { return iterator(_Base::before_begin(), this); }
00296 
00297       const_iterator
00298       before_begin() const noexcept
00299       { return const_iterator(_Base::before_begin(), this); }
00300 
00301       iterator
00302       begin() noexcept
00303       { return iterator(_Base::begin(), this); }
00304 
00305       const_iterator
00306       begin() const noexcept
00307       { return const_iterator(_Base::begin(), this); }
00308 
00309       iterator
00310       end() noexcept
00311       { return iterator(_Base::end(), this); }
00312 
00313       const_iterator
00314       end() const noexcept
00315       { return const_iterator(_Base::end(), this); }
00316 
00317       const_iterator
00318       cbegin() const noexcept
00319       { return const_iterator(_Base::cbegin(), this); }
00320 
00321       const_iterator
00322       cbefore_begin() const noexcept
00323       { return const_iterator(_Base::cbefore_begin(), this); }
00324 
00325       const_iterator
00326       cend() const noexcept
00327       { return const_iterator(_Base::cend(), this); }
00328 
00329       using _Base::empty;
00330       using _Base::max_size;
00331 
00332       // element access:
00333 
00334       reference
00335       front()
00336       {
00337         __glibcxx_check_nonempty();
00338         return _Base::front();
00339       }
00340 
00341       const_reference
00342       front() const
00343       {
00344         __glibcxx_check_nonempty();
00345         return _Base::front();
00346       }
00347 
00348       // modifiers:
00349 
00350       using _Base::emplace_front;
00351       using _Base::push_front;
00352 
00353       void
00354       pop_front()
00355       {
00356         __glibcxx_check_nonempty();
00357         this->_M_invalidate_if([this](_Base_const_iterator __it)
00358           { return __it == this->_M_base().cbegin(); });
00359         _Base::pop_front();
00360       }
00361 
00362       template<typename... _Args>
00363         iterator
00364         emplace_after(const_iterator __pos, _Args&&... __args)
00365         {
00366           __glibcxx_check_insert_after(__pos);
00367           return iterator(_Base::emplace_after(__pos.base(),
00368                                         std::forward<_Args>(__args)...),
00369                           this);
00370         }
00371 
00372       iterator
00373       insert_after(const_iterator __pos, const _Tp& __val)
00374       {
00375         __glibcxx_check_insert_after(__pos);
00376         return iterator(_Base::insert_after(__pos.base(), __val), this);
00377       }
00378 
00379       iterator
00380       insert_after(const_iterator __pos, _Tp&& __val)
00381       {
00382         __glibcxx_check_insert_after(__pos);
00383         return iterator(_Base::insert_after(__pos.base(), std::move(__val)),
00384                         this);
00385       }
00386 
00387       iterator
00388       insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
00389       {
00390         __glibcxx_check_insert_after(__pos);
00391         return iterator(_Base::insert_after(__pos.base(), __n, __val),
00392                         this);
00393       }
00394 
00395       template<typename _InputIterator,
00396                typename = std::_RequireInputIter<_InputIterator>>
00397         iterator
00398         insert_after(const_iterator __pos,
00399                      _InputIterator __first, _InputIterator __last)
00400         {
00401           __glibcxx_check_insert_range_after(__pos, __first, __last);
00402           return iterator(_Base::insert_after(__pos.base(),
00403                                               __gnu_debug::__base(__first),
00404                                               __gnu_debug::__base(__last)),
00405                           this);
00406         }
00407 
00408       iterator
00409       insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)
00410       {
00411         __glibcxx_check_insert_after(__pos);
00412         return iterator(_Base::insert_after(__pos.base(), __il), this);
00413       }
00414 
00415     private:
00416       _Base_iterator
00417       _M_erase_after(_Base_const_iterator __pos)
00418       {
00419         _Base_const_iterator __next = std::next(__pos);
00420         this->_M_invalidate_if([__next](_Base_const_iterator __it)
00421           { return __it == __next; });
00422         return _Base::erase_after(__pos);
00423       }
00424     public:
00425       iterator
00426       erase_after(const_iterator __pos)
00427       {
00428         __glibcxx_check_erase_after(__pos);
00429         return iterator(_M_erase_after(__pos.base()), this);
00430       }
00431 
00432       iterator
00433       erase_after(const_iterator __pos, const_iterator __last)
00434       {
00435         __glibcxx_check_erase_range_after(__pos, __last);
00436         for (_Base_const_iterator __victim = std::next(__pos.base());
00437             __victim != __last.base(); ++__victim)
00438           {
00439             _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
00440                                   _M_message(__gnu_debug::__msg_valid_range2)
00441                                   ._M_sequence(*this, "this")
00442                                   ._M_iterator(__pos, "pos")
00443                                   ._M_iterator(__last, "last"));
00444             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00445               { return __it == __victim; });
00446           }
00447         return iterator(_Base::erase_after(__pos.base(), __last.base()), this);
00448       }
00449 
00450       void
00451       swap(forward_list& __list)
00452         noexcept( noexcept(declval<_Base>().swap(__list)) )
00453       {
00454         _Safe::_M_swap(__list);
00455         _Base::swap(__list);
00456       }
00457 
00458       void
00459       resize(size_type __sz)
00460       {
00461         this->_M_detach_singular();
00462 
00463         // if __sz < size(), invalidate all iterators in [begin+__sz, end()
00464         _Base_iterator __victim = _Base::begin();
00465         _Base_iterator __end = _Base::end();
00466         for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
00467           ++__victim;
00468 
00469         for (; __victim != __end; ++__victim)
00470           {
00471             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00472               { return __it == __victim; });
00473           }
00474 
00475         __try
00476           {
00477             _Base::resize(__sz);
00478           }
00479         __catch(...)
00480           {
00481             this->_M_revalidate_singular();
00482             __throw_exception_again;
00483           }
00484       }
00485 
00486       void
00487       resize(size_type __sz, const value_type& __val)
00488       {
00489         this->_M_detach_singular();
00490 
00491         // if __sz < size(), invalidate all iterators in [begin+__sz, end())
00492         _Base_iterator __victim = _Base::begin();
00493         _Base_iterator __end = _Base::end();
00494         for (size_type __i = __sz; __victim != __end && __i > 0; --__i)
00495           ++__victim;
00496 
00497         for (; __victim != __end; ++__victim)
00498           {
00499             this->_M_invalidate_if([__victim](_Base_const_iterator __it)
00500               { return __it == __victim; });
00501           }
00502 
00503         __try
00504           {
00505             _Base::resize(__sz, __val);
00506           }
00507         __catch(...)
00508           {
00509             this->_M_revalidate_singular();
00510             __throw_exception_again;
00511           }
00512       }
00513 
00514       void
00515       clear() noexcept
00516       {
00517         _Base::clear();
00518         this->_M_invalidate_all();
00519       }
00520 
00521       // 23.2.3.5 forward_list operations:
00522       void
00523       splice_after(const_iterator __pos, forward_list&& __list)
00524       {
00525         __glibcxx_check_insert_after(__pos);
00526         _GLIBCXX_DEBUG_VERIFY(&__list != this,
00527                               _M_message(__gnu_debug::__msg_self_splice)
00528                               ._M_sequence(*this, "this"));
00529         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00530                               _M_message(__gnu_debug::__msg_splice_alloc)
00531                               ._M_sequence(*this)
00532                               ._M_sequence(__list, "__list"));
00533         this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
00534           {
00535             return __it != __list._M_base().cbefore_begin()
00536                    && __it != __list._M_base().end();
00537           });
00538         _Base::splice_after(__pos.base(), std::move(__list._M_base()));
00539       }
00540 
00541       void
00542       splice_after(const_iterator __pos, forward_list& __list)
00543       { splice_after(__pos, std::move(__list)); }
00544 
00545       void
00546       splice_after(const_iterator __pos, forward_list&& __list,
00547                    const_iterator __i)
00548       {
00549         __glibcxx_check_insert_after(__pos);
00550         _GLIBCXX_DEBUG_VERIFY(__i._M_before_dereferenceable(),
00551                               _M_message(__gnu_debug::__msg_splice_bad)
00552                               ._M_iterator(__i, "__i"));
00553         _GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(&__list),
00554                               _M_message(__gnu_debug::__msg_splice_other)
00555                               ._M_iterator(__i, "__i")
00556                               ._M_sequence(__list, "__list"));
00557         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00558                               _M_message(__gnu_debug::__msg_splice_alloc)
00559                               ._M_sequence(*this)
00560                               ._M_sequence(__list, "__list"));
00561 
00562         // _GLIBCXX_RESOLVE_LIB_DEFECTS
00563         // 250. splicing invalidates iterators
00564         _Base_const_iterator __next = std::next(__i.base());
00565         this->_M_transfer_from_if(__list, [__next](_Base_const_iterator __it)
00566           { return __it == __next; });
00567         _Base::splice_after(__pos.base(), std::move(__list._M_base()),
00568                             __i.base());
00569       }
00570 
00571       void
00572       splice_after(const_iterator __pos, forward_list& __list,
00573                    const_iterator __i)
00574       { splice_after(__pos, std::move(__list), __i); }
00575 
00576       void
00577       splice_after(const_iterator __pos, forward_list&& __list,
00578                    const_iterator __before, const_iterator __last)
00579       {
00580         __glibcxx_check_insert_after(__pos);
00581         __glibcxx_check_valid_range(__before, __last);
00582         _GLIBCXX_DEBUG_VERIFY(__before._M_attached_to(&__list),
00583                               _M_message(__gnu_debug::__msg_splice_other)
00584                               ._M_sequence(__list, "list")
00585                               ._M_iterator(__before, "before"));
00586         _GLIBCXX_DEBUG_VERIFY(__before._M_dereferenceable()
00587                               || __before._M_is_before_begin(),
00588                               _M_message(__gnu_debug::__msg_valid_range2)
00589                               ._M_sequence(__list, "list")
00590                               ._M_iterator(__before, "before")
00591                               ._M_iterator(__last, "last"));
00592         _GLIBCXX_DEBUG_VERIFY(__before != __last,
00593                               _M_message(__gnu_debug::__msg_valid_range2)
00594                               ._M_sequence(__list, "list")
00595                               ._M_iterator(__before, "before")
00596                               ._M_iterator(__last, "last"));
00597         _GLIBCXX_DEBUG_VERIFY(__list.get_allocator() == this->get_allocator(),
00598                               _M_message(__gnu_debug::__msg_splice_alloc)
00599                               ._M_sequence(*this)
00600                               ._M_sequence(__list, "__list"));
00601 
00602         for (_Base_const_iterator __tmp = std::next(__before.base());
00603              __tmp != __last.base(); ++__tmp)
00604           {
00605             _GLIBCXX_DEBUG_VERIFY(__tmp != __list._M_base().end(),
00606                                   _M_message(__gnu_debug::__msg_valid_range2)
00607                                   ._M_sequence(__list, "list")
00608                                   ._M_iterator(__before, "before")
00609                                   ._M_iterator(__last, "last"));
00610             _GLIBCXX_DEBUG_VERIFY(&__list != this || __tmp != __pos.base(),
00611                                   _M_message(__gnu_debug::__msg_splice_overlap)
00612                                   ._M_iterator(__tmp, "position")
00613                                   ._M_iterator(__before, "before")
00614                                   ._M_iterator(__last, "last"));
00615             // _GLIBCXX_RESOLVE_LIB_DEFECTS
00616             // 250. splicing invalidates iterators
00617             this->_M_transfer_from_if(__list, [__tmp](_Base_const_iterator __it)
00618               { return __it == __tmp; });
00619           }
00620 
00621         _Base::splice_after(__pos.base(), std::move(__list._M_base()),
00622                             __before.base(), __last.base());
00623       }
00624 
00625       void
00626       splice_after(const_iterator __pos, forward_list& __list,
00627                    const_iterator __before, const_iterator __last)
00628       { splice_after(__pos, std::move(__list), __before, __last); }
00629 
00630       void
00631       remove(const _Tp& __val)
00632       {
00633         _Base_iterator __x = _Base::before_begin();
00634         _Base_iterator __old = __x++;
00635         while (__x != _Base::end())
00636           {
00637             if (*__x == __val)
00638               __x = _M_erase_after(__old);
00639             else
00640               __old = __x++;
00641           }
00642       }
00643 
00644       template<typename _Pred>
00645         void
00646         remove_if(_Pred __pred)
00647         {
00648           _Base_iterator __x = _Base::before_begin();
00649           _Base_iterator __old = __x++;
00650           while (__x != _Base::end())
00651             {
00652               if (__pred(*__x))
00653                 __x = _M_erase_after(__old);
00654               else
00655                 __old = __x++;
00656             }
00657         }
00658 
00659       void
00660       unique()
00661       {
00662         _Base_iterator __first = _Base::begin();
00663         _Base_iterator __last = _Base::end();
00664         if (__first == __last)
00665           return;
00666         _Base_iterator __next = std::next(__first);
00667         while (__next != __last)
00668           {
00669             if (*__first == *__next)
00670               __next = _M_erase_after(__first);
00671             else
00672               __first = __next++;
00673           }
00674       }
00675 
00676       template<typename _BinPred>
00677         void
00678         unique(_BinPred __binary_pred)
00679         {
00680           _Base_iterator __first = _Base::begin();
00681           _Base_iterator __last = _Base::end();
00682           if (__first == __last)
00683             return;
00684           _Base_iterator __next = std::next(__first);
00685           while (__next != __last)
00686             {
00687               if (__binary_pred(*__first, *__next))
00688                 __next = _M_erase_after(__first);
00689               else
00690                 __first = __next++;
00691             }
00692         }
00693 
00694       void
00695       merge(forward_list&& __list)
00696       {
00697         if (this != &__list)
00698         {
00699           __glibcxx_check_sorted(_Base::begin(), _Base::end());
00700           __glibcxx_check_sorted(__list._M_base().begin(),
00701                                  __list._M_base().end());
00702           this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)
00703             {
00704               return __it != __list._M_base().cbefore_begin()
00705                      && __it != __list._M_base().cend();
00706             });
00707           _Base::merge(std::move(__list._M_base()));
00708         }
00709       }
00710 
00711       void
00712       merge(forward_list& __list)
00713       { merge(std::move(__list)); }
00714 
00715       template<typename _Comp>
00716         void
00717         merge(forward_list&& __list, _Comp __comp)
00718         {
00719           if (this != &__list)
00720           {
00721             __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(), __comp);
00722             __glibcxx_check_sorted_pred(__list._M_base().begin(),
00723                                         __list._M_base().end(), __comp);
00724             this->_M_transfer_from_if(__list,
00725                                       [&__list](_Base_const_iterator __it)
00726               {
00727                 return __it != __list._M_base().cbefore_begin()
00728                        && __it != __list._M_base().cend();
00729               });
00730             _Base::merge(std::move(__list._M_base()), __comp);
00731           }
00732         }
00733 
00734       template<typename _Comp>
00735         void
00736         merge(forward_list& __list, _Comp __comp)
00737         { merge(std::move(__list), __comp); }
00738 
00739       using _Base::sort;
00740       using _Base::reverse;
00741 
00742       _Base&
00743       _M_base() noexcept { return *this; }
00744 
00745       const _Base&
00746       _M_base() const noexcept { return *this; }
00747     };
00748 
00749   template<typename _Tp, typename _Alloc>
00750     bool
00751     operator==(const forward_list<_Tp, _Alloc>& __lx,
00752                const forward_list<_Tp, _Alloc>& __ly)
00753     { return __lx._M_base() == __ly._M_base(); }
00754 
00755   template<typename _Tp, typename _Alloc>
00756     inline bool
00757     operator<(const forward_list<_Tp, _Alloc>& __lx,
00758               const forward_list<_Tp, _Alloc>& __ly)
00759     { return __lx._M_base() < __ly._M_base(); }
00760 
00761   template<typename _Tp, typename _Alloc>
00762     inline bool
00763     operator!=(const forward_list<_Tp, _Alloc>& __lx,
00764                const forward_list<_Tp, _Alloc>& __ly)
00765     { return !(__lx == __ly); }
00766 
00767   /// Based on operator<
00768   template<typename _Tp, typename _Alloc>
00769     inline bool
00770     operator>(const forward_list<_Tp, _Alloc>& __lx,
00771               const forward_list<_Tp, _Alloc>& __ly)
00772     { return (__ly < __lx); }
00773 
00774   /// Based on operator<
00775   template<typename _Tp, typename _Alloc>
00776     inline bool
00777     operator>=(const forward_list<_Tp, _Alloc>& __lx,
00778                const forward_list<_Tp, _Alloc>& __ly)
00779     { return !(__lx < __ly); }
00780 
00781   /// Based on operator<
00782   template<typename _Tp, typename _Alloc>
00783     inline bool
00784     operator<=(const forward_list<_Tp, _Alloc>& __lx,
00785                const forward_list<_Tp, _Alloc>& __ly)
00786     { return !(__ly < __lx); }
00787 
00788   /// See std::forward_list::swap().
00789   template<typename _Tp, typename _Alloc>
00790     inline void
00791     swap(forward_list<_Tp, _Alloc>& __lx,
00792          forward_list<_Tp, _Alloc>& __ly)
00793     { __lx.swap(__ly); }
00794 
00795 } // namespace __debug
00796 } // namespace std
00797 
00798 namespace __gnu_debug
00799 {
00800   template<class _Tp, class _Alloc>
00801     struct _BeforeBeginHelper<std::__debug::forward_list<_Tp, _Alloc> >
00802     {
00803       typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence;
00804 
00805       template<typename _Iterator>
00806         static bool
00807         _S_Is(const _Safe_iterator<_Iterator, _Sequence>& __it)
00808         {
00809           return
00810             __it.base() == __it._M_get_sequence()->_M_base().before_begin();
00811         }
00812 
00813       template<typename _Iterator>
00814         static bool
00815         _S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence>& __it)
00816         { return _S_Is(__it); }
00817     };
00818 
00819 #ifndef _GLIBCXX_DEBUG_PEDANTIC
00820   template<class _Tp, class _Alloc>
00821     struct _Insert_range_from_self_is_safe<
00822       std::__debug::forward_list<_Tp, _Alloc> >
00823     { enum { __value = 1 }; };
00824 #endif
00825 }
00826 
00827 #endif