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//  -*- C++ -*-

// Copyright (C) 2010 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

/** @file debug/forward_list

 *  This file is a GNU debug extension to the Standard C++ Library.

 */

#ifndef _GLIBCXX_DEBUG_FORWARD_LIST

#define _GLIBCXX_DEBUG_FORWARD_LIST 1

#pragma GCC system_header

#include 

#include 

#include 

namespace std _GLIBCXX_VISIBILITY(default)

{

namespace __debug

{

  /// Class std::forward_list with safety/checking/debug instrumentation.

  template >

    class forward_list

    : public _GLIBCXX_STD_C::forward_list<_Tp, _Alloc>,

      public __gnu_debug::_Safe_sequence >

    {

      typedef _GLIBCXX_STD_C::forward_list<_Tp, _Alloc> _Base;

      typedef typename _Base::iterator       _Base_iterator;

      typedef typename _Base::const_iterator _Base_const_iterator;

    public:

      typedef typename _Base::reference             reference;

      typedef typename _Base::const_reference       const_reference;

      typedef __gnu_debug::_Safe_iterator<_Base_iterator,

                                          forward_list> iterator;

      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator,

                                          forward_list> const_iterator;

      typedef typename _Base::size_type             size_type;

      typedef typename _Base::difference_type       difference_type;

      typedef _Tp                                   value_type;

      typedef _Alloc                                allocator_type;

      typedef typename _Base::pointer               pointer;

      typedef typename _Base::const_pointer         const_pointer;

      // 23.2.3.1 construct/copy/destroy:

      explicit

      forward_list(const _Alloc& __al = _Alloc())

      : _Base(__al) { }

      forward_list(const forward_list& __list, const _Alloc& __al)

      : _Base(__list, __al)

      { }

      forward_list(forward_list&& __list, const _Alloc& __al)

      : _Base(std::move(__list._M_base()), __al)

      {

        this->_M_swap(__list);

      }

      explicit

      forward_list(size_type __n)

      : _Base(__n)

      { }

      forward_list(size_type __n, const _Tp& __value,

                   const _Alloc& __al = _Alloc())

      : _Base(__n, __value, __al)

      { }

      template

        forward_list(_InputIterator __first, _InputIterator __last,

                     const _Alloc& __al = _Alloc())

        : _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,

                                                                     __last)),

                __gnu_debug::__base(__last), __al)

        { }

      forward_list(const forward_list& __list)

      : _Base(__list)

      { }

      forward_list(forward_list&& __list) noexcept

      : _Base(std::move(__list._M_base()))

      {

        this->_M_swap(__list);

      }

      forward_list(std::initializer_list<_Tp> __il,

                   const _Alloc& __al = _Alloc())

      : _Base(__il, __al)

      { }

      ~forward_list() noexcept

      { }

      forward_list&

      operator=(const forward_list& __list)

      {

        static_cast<_Base&>(*this) = __list;

        this->_M_invalidate_all();

        return *this;

      }

      forward_list&

      operator=(forward_list&& __list)

      {

        // NB: DR 1204.

        // NB: DR 675.

        clear();

        swap(__list);

        return *this;

      }

      forward_list&

      operator=(std::initializer_list<_Tp> __il)

      {

        static_cast<_Base&>(*this) = __il;

        this->_M_invalidate_all();

        return *this;

      }

      template

        void

        assign(_InputIterator __first, _InputIterator __last)

        {

          __glibcxx_check_valid_range(__first, __last);

          _Base::assign(__gnu_debug::__base(__first),

                        __gnu_debug::__base(__last));

          this->_M_invalidate_all();

        }

      void

      assign(size_type __n, const _Tp& __val)

      {

        _Base::assign(__n, __val);

        this->_M_invalidate_all();

      }

      void

      assign(std::initializer_list<_Tp> __il)

      {

        _Base::assign(__il);

        this->_M_invalidate_all();

      }

      using _Base::get_allocator;

      // iterators:

      iterator

      before_begin() noexcept

      { return iterator(_Base::before_begin(), this); }

      const_iterator

      before_begin() const noexcept

      { return const_iterator(_Base::before_begin(), this); }

      iterator

      begin() noexcept

      { return iterator(_Base::begin(), this); }

      const_iterator

      begin() const noexcept

      { return const_iterator(_Base::begin(), this); }

      iterator

      end() noexcept

      { return iterator(_Base::end(), this); }

      const_iterator

      end() const noexcept

      { return const_iterator(_Base::end(), this); }

      const_iterator

      cbegin() const noexcept

      { return const_iterator(_Base::cbegin(), this); }

      const_iterator

      cbefore_begin() const noexcept

      { return const_iterator(_Base::cbefore_begin(), this); }

      const_iterator

      cend() const noexcept

      { return const_iterator(_Base::cend(), this); }

      using _Base::empty;

      using _Base::max_size;

      // element access:

      reference

      front()

      {

        __glibcxx_check_nonempty();

        return _Base::front();

      }

      const_reference

      front() const

      {

        __glibcxx_check_nonempty();

        return _Base::front();

      }

      // modifiers:

      using _Base::emplace_front;

      using _Base::push_front;

      void

      pop_front()

      {

        __glibcxx_check_nonempty();

        this->_M_invalidate_if([this](_Base_const_iterator __it)

          { return __it == this->_M_base().cbegin(); });

        _Base::pop_front();

      }

      template

        iterator

        emplace_after(const_iterator __pos, _Args&&... __args)

        {

          __glibcxx_check_insert_after(__pos);

          return iterator(_Base::emplace_after(__pos.base(),

                                        std::forward<_Args>(__args)...),

                          this);

        }

      iterator

      insert_after(const_iterator __pos, const _Tp& __val)

      {

        __glibcxx_check_insert_after(__pos);

        return iterator(_Base::insert_after(__pos.base(), __val), this);

      }

      iterator

      insert_after(const_iterator __pos, _Tp&& __val)

      {

        __glibcxx_check_insert_after(__pos);

        return iterator(_Base::insert_after(__pos.base(), std::move(__val)),

                        this);

      }

      iterator

      insert_after(const_iterator __pos, size_type __n, const _Tp& __val)

      {

        __glibcxx_check_insert_after(__pos);

        return iterator(_Base::insert_after(__pos.base(), __n, __val),

                        this);

      }

      template

        iterator

        insert_after(const_iterator __pos,

                     _InputIterator __first, _InputIterator __last)

        {

          __glibcxx_check_insert_range_after(__pos, __first, __last);

          return iterator(_Base::insert_after(__pos.base(),

                                              __gnu_debug::__base(__first),

                                              __gnu_debug::__base(__last)),

                          this);

        }

      iterator

      insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)

      {

        __glibcxx_check_insert_after(__pos);

        return iterator(_Base::insert_after(__pos.base(), __il), this);

      }

    private:

      _Base_iterator

      _M_erase_after(_Base_const_iterator __pos)

      {

        _Base_const_iterator __next = std::next(__pos);

        this->_M_invalidate_if([__next](_Base_const_iterator __it)

          { return __it == __next; });

        return _Base::erase_after(__pos);

      }

    public:

      iterator

      erase_after(const_iterator __pos)

      {

        __glibcxx_check_erase_after(__pos);

        return iterator(_M_erase_after(__pos.base()), this);

      }

      iterator

      erase_after(const_iterator __pos, const_iterator __last)

      {

        __glibcxx_check_erase_range_after(__pos, __last);

        for (_Base_const_iterator __victim = std::next(__pos.base());

            __victim != __last.base(); ++__victim)

          {

            _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),

                                  _M_message(__gnu_debug::__msg_valid_range2)

                                  ._M_sequence(*this, "this")

                                  ._M_iterator(__pos, "pos")

                                  ._M_iterator(__last, "last"));

            this->_M_invalidate_if([__victim](_Base_const_iterator __it)

              { return __it == __victim; });

          }

        return iterator(_Base::erase_after(__pos.base(), __last.base()), this);

      }

      void

      swap(forward_list& __list)

      {

        _Base::swap(__list);

        this->_M_swap(__list);

      }

      void

      resize(size_type __sz)

      {

        this->_M_detach_singular();

        // if __sz < size(), invalidate all iterators in [begin+__sz, end()

        _Base_iterator __victim = _Base::begin();

        _Base_iterator __end = _Base::end();

        for (size_type __i = __sz; __victim != __end && __i > 0; --__i)

          ++__victim;

        for (; __victim != __end; ++__victim)

          {

            this->_M_invalidate_if([__victim](_Base_const_iterator __it)

              { return __it == __victim; });

          }

        __try

          {

            _Base::resize(__sz);

          }

        __catch(...)

          {

            this->_M_revalidate_singular();

            __throw_exception_again;

          }

      }

      void

      resize(size_type __sz, const value_type& __val)

      {

        this->_M_detach_singular();

        // if __sz < size(), invalidate all iterators in [begin+__sz, end())

        _Base_iterator __victim = _Base::begin();

        _Base_iterator __end = _Base::end();

        for (size_type __i = __sz; __victim != __end && __i > 0; --__i)

          ++__victim;

        for (; __victim != __end; ++__victim)

          {

            this->_M_invalidate_if([__victim](_Base_const_iterator __it)

              { return __it == __victim; });

          }

        __try

          {

            _Base::resize(__sz, __val);

          }

        __catch(...)

          {

            this->_M_revalidate_singular();

            __throw_exception_again;

          }

      }

      void

      clear() noexcept

      {

        _Base::clear();

        this->_M_invalidate_all();

      }

      // 23.2.3.5 forward_list operations:

      void

      splice_after(const_iterator __pos, forward_list&& __list)

      {

        __glibcxx_check_insert_after(__pos);

        _GLIBCXX_DEBUG_VERIFY(&__list != this,

                              _M_message(__gnu_debug::__msg_self_splice)

                              ._M_sequence(*this, "this"));

        this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)

          {

            return __it != __list._M_base().cbefore_begin()

                   && __it != __list._M_base().end();

          });

        _Base::splice_after(__pos.base(), std::move(__list._M_base()));

      }

      void

      splice_after(const_iterator __pos, forward_list&& __list,

                   const_iterator __i)

      {

        __glibcxx_check_insert_after(__pos);

        _GLIBCXX_DEBUG_VERIFY(__i._M_before_dereferenceable(),

                              _M_message(__gnu_debug::__msg_splice_bad)

                              ._M_iterator(__i, "__i"));

        _GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(&__list),

                              _M_message(__gnu_debug::__msg_splice_other)

                              ._M_iterator(__i, "__i")

                              ._M_sequence(__list, "__list"));

        // _GLIBCXX_RESOLVE_LIB_DEFECTS

        // 250. splicing invalidates iterators

        _Base_const_iterator __next = std::next(__i.base());

        this->_M_transfer_from_if(__list, [__next](_Base_const_iterator __it)

          { return __it == __next; });

        _Base::splice_after(__pos.base(), std::move(__list._M_base()),

                            __i.base());

      }

      void

      splice_after(const_iterator __pos, forward_list&& __list,

                   const_iterator __before, const_iterator __last)

      {

        __glibcxx_check_insert_after(__pos);

        __glibcxx_check_valid_range(__before, __last);

        _GLIBCXX_DEBUG_VERIFY(__before._M_attached_to(&__list),

                              _M_message(__gnu_debug::__msg_splice_other)

                              ._M_sequence(__list, "list")

                              ._M_iterator(__before, "before"));

        _GLIBCXX_DEBUG_VERIFY(__before._M_dereferenceable()

                              || __before._M_is_before_begin(),

                              _M_message(__gnu_debug::__msg_valid_range2)

                              ._M_sequence(__list, "list")

                              ._M_iterator(__before, "before")

                              ._M_iterator(__last, "last"));

        _GLIBCXX_DEBUG_VERIFY(__before != __last,

                              _M_message(__gnu_debug::__msg_valid_range2)

                              ._M_sequence(__list, "list")

                              ._M_iterator(__before, "before")

                              ._M_iterator(__last, "last"));

        for (_Base_const_iterator __tmp = std::next(__before.base());

             __tmp != __last.base(); ++__tmp)

          {

            _GLIBCXX_DEBUG_VERIFY(__tmp != __list._M_base().end(),

                                  _M_message(__gnu_debug::__msg_valid_range2)

                                  ._M_sequence(__list, "list")

                                  ._M_iterator(__before, "before")

                                  ._M_iterator(__last, "last"));

            _GLIBCXX_DEBUG_VERIFY(&__list != this || __tmp != __pos.base(),

                                  _M_message(__gnu_debug::__msg_splice_overlap)

                                  ._M_iterator(__tmp, "position")

                                  ._M_iterator(__before, "before")

                                  ._M_iterator(__last, "last"));

            // _GLIBCXX_RESOLVE_LIB_DEFECTS

            // 250. splicing invalidates iterators

            this->_M_transfer_from_if(__list, [__tmp](_Base_const_iterator __it)

              { return __it == __tmp; });

          }

        _Base::splice_after(__pos.base(), std::move(__list._M_base()),

                            __before.base(), __last.base());

      }

      void

      remove(const _Tp& __val)

      {

        _Base_iterator __x = _Base::before_begin();

        _Base_iterator __old = __x++;

        while (__x != _Base::end())

          {

            if (*__x == __val)

              __x = _M_erase_after(__old);

            else

              __old = __x++;

          }

      }

      template

        void

        remove_if(_Pred __pred)

        {

          _Base_iterator __x = _Base::before_begin();

          _Base_iterator __old = __x++;

          while (__x != _Base::end())

            {

              if (__pred(*__x))

                __x = _M_erase_after(__old);

              else

                __old = __x++;

            }

        }

      void

      unique()

      {

        _Base_iterator __first = _Base::begin();

        _Base_iterator __last = _Base::end();

        if (__first == __last)

          return;

        _Base_iterator __next = std::next(__first);

        while (__next != __last)

          {

            if (*__first == *__next)

              __next = _M_erase_after(__first);

            else

              __first = __next++;

          }

      }

      template

        void

        unique(_BinPred __binary_pred)

        {

          _Base_iterator __first = _Base::begin();

          _Base_iterator __last = _Base::end();

          if (__first == __last)

            return;

          _Base_iterator __next = std::next(__first);

          while (__next != __last)

            {

              if (__binary_pred(*__first, *__next))

                __next = _M_erase_after(__first);

              else

                __first = __next++;

            }

        }

      void

      merge(forward_list&& __list)

      {

        if (this != &__list)

        {

          __glibcxx_check_sorted(_Base::begin(), _Base::end());

          __glibcxx_check_sorted(__list._M_base().begin(),

                                 __list._M_base().end());

          this->_M_transfer_from_if(__list, [&__list](_Base_const_iterator __it)

            {

              return __it != __list._M_base().cbefore_begin()

                     && __it != __list._M_base().cend();

            });

          _Base::merge(std::move(__list._M_base()));

        }

      }

      template

        void

        merge(forward_list&& __list, _Comp __comp)

        {

          if (this != &__list)

          {

            __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(), __comp);

            __glibcxx_check_sorted_pred(__list._M_base().begin(),

                                        __list._M_base().end(), __comp);

            this->_M_transfer_from_if(__list,

                                      [&__list](_Base_const_iterator __it)

              {

                return __it != __list._M_base().cbefore_begin()

                       && __it != __list._M_base().cend();

              });

            _Base::merge(std::move(__list._M_base()), __comp);

          }

        }

      using _Base::sort;

      using _Base::reverse;

      _Base&

      _M_base() noexcept       { return *this; }

      const _Base&

      _M_base() const noexcept { return *this; }

    private:

      void

      _M_invalidate_all()

      {

        this->_M_invalidate_if([this](_Base_const_iterator __it)

          {

            return __it != this->_M_base().cbefore_begin()

                   && __it != this->_M_base().cend();

          });

      }

      typedef __gnu_debug::_Safe_iterator_base _Safe_iterator_base;

      static void

      _M_swap_aux(forward_list& __lhs,

                  _Safe_iterator_base*& __lhs_iterators,

                  forward_list& __rhs,

                  _Safe_iterator_base*& __rhs_iterators);

      void _M_swap(forward_list& __list);

    };

   template

    void

    forward_list<_Tp, _Alloc>::

    _M_swap_aux(forward_list<_Tp, _Alloc>& __lhs,

                __gnu_debug::_Safe_iterator_base*& __lhs_iterators,

                forward_list<_Tp, _Alloc>& __rhs,

                __gnu_debug::_Safe_iterator_base*& __rhs_iterators)

    {

      using __gnu_debug::_Safe_iterator_base;

      _Safe_iterator_base* __bbegin_its = 0;

      _Safe_iterator_base* __last_bbegin = 0;

      for (_Safe_iterator_base* __iter = __lhs_iterators; __iter;)

        {

          // Even iterator are casted to const_iterator, not a problem.

          const_iterator* __victim = static_cast(__iter);

          __iter = __iter->_M_next;

          if (__victim->base() == __rhs._M_base().cbefore_begin())

            {

              __victim->_M_unlink();

              if (__lhs_iterators == __victim)

                __lhs_iterators = __victim->_M_next;

              if (__bbegin_its)

                {

                  __victim->_M_next = __bbegin_its;

                  __bbegin_its->_M_prior = __victim;

                }

              else

                __last_bbegin = __victim;

              __bbegin_its = __victim;

            }

          else

            __victim->_M_sequence = &__lhs;

        }

      if (__bbegin_its)

        {

          if (__rhs_iterators)

            {

              __rhs_iterators->_M_prior = __last_bbegin;

              __last_bbegin->_M_next = __rhs_iterators;

            }

          __rhs_iterators = __bbegin_its;

        }

    }

  /* Special forward_list _M_swap version that do not swap the

   * before-begin ownership.*/

  template

    void

    forward_list<_Tp, _Alloc>::

    _M_swap(forward_list<_Tp, _Alloc>& __list)

    {

      __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());

      std::swap(this->_M_iterators, __list._M_iterators);

      std::swap(this->_M_const_iterators, __list._M_const_iterators);

      // Useless, always 1 on forward_list

      //std::swap(this->_M_version, __list._M_version);

      _Safe_iterator_base* __this_its = this->_M_iterators;

      _M_swap_aux(__list, __list._M_iterators, *this, this->_M_iterators);

      _Safe_iterator_base* __this_const_its = this->_M_const_iterators;

      _M_swap_aux(__list, __list._M_const_iterators, *this,

                  this->_M_const_iterators);

      _M_swap_aux(*this, __this_its, __list, __list._M_iterators);

      _M_swap_aux(*this, __this_const_its, __list, __list._M_const_iterators);

    }

  template

    bool

    operator==(const forward_list<_Tp, _Alloc>& __lx,

               const forward_list<_Tp, _Alloc>& __ly)

    { return __lx._M_base() == __ly._M_base(); }

  template

    inline bool

    operator<(const forward_list<_Tp, _Alloc>& __lx,

              const forward_list<_Tp, _Alloc>& __ly)

    { return __lx._M_base() < __ly._M_base(); }

  template

    inline bool

    operator!=(const forward_list<_Tp, _Alloc>& __lx,

               const forward_list<_Tp, _Alloc>& __ly)

    { return !(__lx == __ly); }

  /// Based on operator<

  template

    inline bool

    operator>(const forward_list<_Tp, _Alloc>& __lx,

              const forward_list<_Tp, _Alloc>& __ly)

    { return (__ly < __lx); }

  /// Based on operator<

  template

    inline bool

    operator>=(const forward_list<_Tp, _Alloc>& __lx,

               const forward_list<_Tp, _Alloc>& __ly)

    { return !(__lx < __ly); }

  /// Based on operator<

  template

    inline bool

    operator<=(const forward_list<_Tp, _Alloc>& __lx,

               const forward_list<_Tp, _Alloc>& __ly)

    { return !(__ly < __lx); }

  /// See std::forward_list::swap().

  template

    inline void

    swap(forward_list<_Tp, _Alloc>& __lx,

         forward_list<_Tp, _Alloc>& __ly)

    { __lx.swap(__ly); }

} // namespace __debug

} // namespace std

namespace __gnu_debug

{

  template

    struct _BeforeBeginHelper >

    {

      typedef std::__debug::forward_list<_Tp, _Alloc> _Sequence;

      typedef typename _Sequence::const_iterator _It;

      typedef typename _It::iterator_type _BaseIt;

      static bool

      _M_Is(_BaseIt __it, const _Sequence* __seq)

      { return __it == __seq->_M_base().cbefore_begin(); }

    };

}

#endif