// <forward_list.tcc> -*- C++ -*-
-// Copyright (C) 2008 Free Software Foundation, Inc.
+// Copyright (C) 2008-2019 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 2, or (at your option)
+// 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,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License
-// along with this library; see the file COPYING. If not, write to
-// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-// Boston, MA 02110-1301, USA.
-
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
-
-/** @file forward_list.tcc
- * This is a Standard C++ Library header.
+// 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
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/forward_list.tcc
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{forward_list}
*/
#ifndef _FORWARD_LIST_TCC
#define _FORWARD_LIST_TCC 1
-_GLIBCXX_BEGIN_NAMESPACE(std)
-
- /**
- * @brief Sort the singly linked list starting after this node.
- * This node is assumed to be an empty head node (of type
- * _Fwd_list_node_base).
- */
- template<typename _Tp>
- template<typename _Comp>
- void
- _Fwd_list_node<_Tp>::
- _M_sort_after(_Comp __comp)
- {
- // If `next' is 0, return immediately.
- _Fwd_list_node* __list = static_cast<_Fwd_list_node*>(this->_M_next);
- if (!__list)
- return;
-
- unsigned long __insize = 1;
-
- while (1)
- {
- _Fwd_list_node* __p = __list;
- __list = 0;
- _Fwd_list_node* __tail = 0;
-
- // Count number of merges we do in this pass.
- unsigned long __nmerges = 0;
-
- while (__p)
- {
- ++__nmerges;
- // There exists a merge to be done.
- // Step `insize' places along from p.
- _Fwd_list_node* __q = __p;
- unsigned long __psize = 0;
- for (unsigned long __i = 0; __i < __insize; ++__i)
- {
- ++__psize;
- __q = static_cast<_Fwd_list_node*>(__q->_M_next);
- if (!__q)
- break;
- }
-
- // If q hasn't fallen off end, we have two lists to merge.
- unsigned long __qsize = __insize;
-
- // Now we have two lists; merge them.
- while (__psize > 0 || (__qsize > 0 && __q))
- {
- // Decide whether next node of merge comes from p or q.
- _Fwd_list_node<_Tp>* __e;
- if (__psize == 0)
- {
- // p is empty; e must come from q.
- __e = __q;
- __q = static_cast<_Fwd_list_node*>(__q->_M_next);
- --__qsize;
- }
- else if (__qsize == 0 || !__q)
- {
- // q is empty; e must come from p.
- __e = __p;
- __p = static_cast<_Fwd_list_node*>(__p->_M_next);
- --__psize;
- }
- else if (__comp(__p->_M_value, __q->_M_value))
- {
- // First node of p is lower; e must come from p.
- __e = __p;
- __p = static_cast<_Fwd_list_node*>(__p->_M_next);
- --__psize;
- }
- else
- {
- // First node of q is lower; e must come from q.
- __e = __q;
- __q = static_cast<_Fwd_list_node*>(__q->_M_next);
- --__qsize;
- }
-
- // Add the next node to the merged list.
- if (__tail)
- __tail->_M_next = __e;
- else
- __list = __e;
- __tail = __e;
- }
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
- // Now p has stepped `insize' places along, and q has too.
- __p = __q;
- }
- __tail->_M_next = 0;
-
- // If we have done only one merge, we're finished.
- // Allow for nmerges == 0, the empty list case.
- if (__nmerges <= 1)
- {
- this->_M_next = __list;
- return;
- }
-
- // Otherwise repeat, merging lists twice the size.
- __insize *= 2;
- }
- }
-
template<typename _Tp, typename _Alloc>
_Fwd_list_base<_Tp, _Alloc>::
- _Fwd_list_base(const _Fwd_list_base& __lst, const _Alloc& __a)
- : _M_impl(__a)
+ _Fwd_list_base(_Fwd_list_base&& __lst, _Node_alloc_type&& __a)
+ : _M_impl(std::move(__a))
{
- this->_M_impl._M_head._M_next = 0;
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- _Node* __curr = static_cast<_Node*>(__lst._M_impl._M_head._M_next);
- while (__curr)
- {
- __to->_M_next = _M_create_node(__curr->_M_value);
- __to = __to->_M_next;
- __curr = static_cast<_Node*>(__curr->_M_next);
- }
+ if (__lst._M_get_Node_allocator() == _M_get_Node_allocator())
+ this->_M_impl._M_head = std::move(__lst._M_impl._M_head);
}
template<typename _Tp, typename _Alloc>
_M_erase_after(_Fwd_list_node_base* __pos)
{
_Node* __curr = static_cast<_Node*>(__pos->_M_next);
- if (__curr)
- {
- _Fwd_list_node_base* __next = __curr->_M_next;
- __pos->_M_next = __next;
- _M_get_Node_allocator().destroy(__curr);
- _M_put_node(__curr);
- }
- return __pos;
+ __pos->_M_next = __curr->_M_next;
+ _Node_alloc_traits::destroy(_M_get_Node_allocator(),
+ __curr->_M_valptr());
+ __curr->~_Node();
+ _M_put_node(__curr);
+ return __pos->_M_next;
}
template<typename _Tp, typename _Alloc>
_Fwd_list_node_base*
_Fwd_list_base<_Tp, _Alloc>::
- _M_erase_after(_Fwd_list_node_base* __pos, _Fwd_list_node_base* __last)
+ _M_erase_after(_Fwd_list_node_base* __pos,
+ _Fwd_list_node_base* __last)
{
_Node* __curr = static_cast<_Node*>(__pos->_M_next);
- while (__curr)
+ while (__curr != __last)
{
_Node* __temp = __curr;
__curr = static_cast<_Node*>(__curr->_M_next);
- _M_get_Node_allocator().destroy(__temp);
+ _Node_alloc_traits::destroy(_M_get_Node_allocator(),
+ __temp->_M_valptr());
+ __temp->~_Node();
_M_put_node(__temp);
- __pos->_M_next = __curr;
- if (__temp == __last)
- break;
- }
- return __pos;
- }
-
- template<typename _Tp, typename _Alloc>
- forward_list<_Tp, _Alloc>::
- forward_list(size_type __n)
- : _Base()
- {
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- for (size_type __i = 0; __i < __n; ++__i)
- {
- __to->_M_next = this->_M_create_node(_Tp());
- __to = __to->_M_next;
- }
- }
-
- template<typename _Tp, typename _Alloc>
- forward_list<_Tp, _Alloc>::
- forward_list(size_type __n, const _Tp& __value, const _Alloc& __al)
- : _Base(__al)
- {
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- for (size_type __i = 0; __i < __n; ++__i)
- {
- __to->_M_next = this->_M_create_node(__value);
- __to = __to->_M_next;
}
+ __pos->_M_next = __last;
+ return __last;
}
+ // Called by the range constructor to implement [23.3.4.2]/9
template<typename _Tp, typename _Alloc>
template<typename _InputIterator>
+ void
forward_list<_Tp, _Alloc>::
- forward_list(_InputIterator __first, _InputIterator __last,
- const _Alloc& __al)
- : _Base(__al)
+ _M_range_initialize(_InputIterator __first, _InputIterator __last)
{
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- _InputIterator __curr = __first;
- while (__curr != __last)
- {
- __to->_M_next = this->_M_create_node(*__curr);
- __to = __to->_M_next;
- ++__curr;
- }
+ _Node_base* __to = &this->_M_impl._M_head;
+ for (; __first != __last; ++__first)
+ {
+ __to->_M_next = this->_M_create_node(*__first);
+ __to = __to->_M_next;
+ }
}
+ // Called by forward_list(n,v,a).
template<typename _Tp, typename _Alloc>
+ void
forward_list<_Tp, _Alloc>::
- forward_list(const forward_list& __list)
- : _Base(__list._M_get_Node_allocator())
+ _M_fill_initialize(size_type __n, const value_type& __value)
{
- const _Fwd_list_node_base* __from = &__list._M_impl._M_head;
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- while (__from->_M_next != 0)
+ _Node_base* __to = &this->_M_impl._M_head;
+ for (; __n; --__n)
{
- const _Node* __temp = static_cast<_Node*>(__from->_M_next);
- __to->_M_next = this->_M_create_node(__temp->_M_value);
- __from = __from->_M_next;
+ __to->_M_next = this->_M_create_node(__value);
__to = __to->_M_next;
}
}
template<typename _Tp, typename _Alloc>
+ void
forward_list<_Tp, _Alloc>::
- forward_list(std::initializer_list<_Tp> __il, const _Alloc& __al)
- : _Base(__al)
+ _M_default_initialize(size_type __n)
{
- _Fwd_list_node_base* __to = &this->_M_impl._M_head;
- for (const _Tp* __item = __il.begin();
- __item != __il.end(); ++__item)
+ _Node_base* __to = &this->_M_impl._M_head;
+ for (; __n; --__n)
{
- __to->_M_next = this->_M_create_node(*__item);
+ __to->_M_next = this->_M_create_node();
__to = __to->_M_next;
}
}
forward_list<_Tp, _Alloc>::
operator=(const forward_list& __list)
{
- if (&__list != this)
+ if (std::__addressof(__list) != this)
{
- iterator __prev1 = before_begin();
- iterator __curr1 = begin();
- iterator __last1 = end();
- const_iterator __first2 = __list.cbegin();
- const_iterator __last2 = __list.cend();
- while (__curr1 != __last1 && __first2 != __last2)
+ if (_Node_alloc_traits::_S_propagate_on_copy_assign())
{
- *__curr1 = *__first2;
- ++__prev1;
- ++__curr1;
- ++__first2;
+ auto& __this_alloc = this->_M_get_Node_allocator();
+ auto& __that_alloc = __list._M_get_Node_allocator();
+ if (!_Node_alloc_traits::_S_always_equal()
+ && __this_alloc != __that_alloc)
+ {
+ // replacement allocator cannot free existing storage
+ clear();
+ }
+ std::__alloc_on_copy(__this_alloc, __that_alloc);
}
- if (__first2 == __last2)
- erase_after(__prev1, __last1);
- else
- insert_after(__prev1, __first2, __last2);
+ assign(__list.cbegin(), __list.cend());
}
return *this;
}
template<typename _Tp, typename _Alloc>
void
forward_list<_Tp, _Alloc>::
- insert_after(const_iterator __pos,
- size_type __n, const _Tp& __val)
+ _M_default_insert_after(const_iterator __pos, size_type __n)
{
- _Fwd_list_node_base* __to
- = const_cast<_Fwd_list_node_base*>(__pos._M_node);
- _Fwd_list_node_base* __keep = __to->_M_next;
- for (size_type __i = 0; __i < __n; ++__i)
+ const_iterator __saved_pos = __pos;
+ __try
{
- __to->_M_next = this->_M_create_node(__val);
- __to = __to->_M_next;
+ for (; __n; --__n)
+ __pos = emplace_after(__pos);
+ }
+ __catch(...)
+ {
+ erase_after(__saved_pos, ++__pos);
+ __throw_exception_again;
}
- __to->_M_next = __keep;
}
- template<typename _Tp, typename _Alloc>
- template<typename _InputIterator>
- void
- forward_list<_Tp, _Alloc>::
- insert_after(const_iterator __pos,
- _InputIterator __first, _InputIterator __last)
- {
- _Fwd_list_node_base* __to
- = const_cast<_Fwd_list_node_base*>(__pos._M_node);
- _Fwd_list_node_base* __keep = __to->_M_next;
- _InputIterator __curr = __first;
- while (__curr != __last)
- {
- __to->_M_next = this->_M_create_node(*__curr);
- __to = __to->_M_next;
- ++__curr;
- }
- __to->_M_next = __keep;
- }
-
template<typename _Tp, typename _Alloc>
void
forward_list<_Tp, _Alloc>::
- insert_after(const_iterator __pos, std::initializer_list<_Tp> __il)
+ resize(size_type __sz)
{
- _Fwd_list_node_base* __to
- = const_cast<_Fwd_list_node_base*>(__pos._M_node);
- _Fwd_list_node_base* __keep = __to->_M_next;
- const _Tp* __item = __il.begin();
- while (__item != __il.end())
+ iterator __k = before_begin();
+
+ size_type __len = 0;
+ while (__k._M_next() != end() && __len < __sz)
{
- __to->_M_next = this->_M_create_node(*__item);
- __to = __to->_M_next;
- ++__item;
+ ++__k;
+ ++__len;
}
- __to->_M_next = __keep;
+ if (__len == __sz)
+ erase_after(__k, end());
+ else
+ _M_default_insert_after(__k, __sz - __len);
}
template<typename _Tp, typename _Alloc>
void
forward_list<_Tp, _Alloc>::
- resize(size_type __sz, value_type __val)
+ resize(size_type __sz, const value_type& __val)
{
iterator __k = before_begin();
}
template<typename _Tp, typename _Alloc>
- void
+ typename forward_list<_Tp, _Alloc>::iterator
forward_list<_Tp, _Alloc>::
- splice_after(const_iterator __pos, forward_list&& __list)
+ _M_splice_after(const_iterator __pos,
+ const_iterator __before, const_iterator __last)
{
- if (!__list.empty() && &__list != this)
- {
- _Fwd_list_node_base* __tmp
- = const_cast<_Fwd_list_node_base*>(__pos._M_node);
- const_iterator __before = __list.cbefore_begin();
- __tmp->_M_transfer_after(const_cast<_Fwd_list_node_base*>
- (__before._M_node));
- }
+ _Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
+ _Node_base* __b = const_cast<_Node_base*>(__before._M_node);
+ _Node_base* __end = __b;
+
+ while (__end && __end->_M_next != __last._M_node)
+ __end = __end->_M_next;
+
+ if (__b != __end)
+ return iterator(__tmp->_M_transfer_after(__b, __end));
+ else
+ return iterator(__tmp);
}
template<typename _Tp, typename _Alloc>
void
forward_list<_Tp, _Alloc>::
- splice_after(const_iterator __pos, forward_list&& __list,
- const_iterator __before, const_iterator __last)
+ splice_after(const_iterator __pos, forward_list&&,
+ const_iterator __i) noexcept
{
- _Fwd_list_node_base* __tmp
- = const_cast<_Fwd_list_node_base*>(__pos._M_node);
- __tmp->_M_transfer_after(const_cast<_Fwd_list_node_base*>
- (__before._M_node),
- const_cast<_Fwd_list_node_base*>
- (__last._M_node));
+ const_iterator __j = __i;
+ ++__j;
+
+ if (__pos == __i || __pos == __j)
+ return;
+
+ _Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
+ __tmp->_M_transfer_after(const_cast<_Node_base*>(__i._M_node),
+ const_cast<_Node_base*>(__j._M_node));
}
template<typename _Tp, typename _Alloc>
- void
+ typename forward_list<_Tp, _Alloc>::iterator
forward_list<_Tp, _Alloc>::
- remove(const _Tp& __val)
+ insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
{
- _Node* __curr = static_cast<_Node*>(&this->_M_impl._M_head);
- while (_Node* __temp = static_cast<_Node*>(__curr->_M_next))
+ if (__n)
{
- if (__temp->_M_value == __val)
- this->_M_erase_after(__curr);
- else
- __curr = static_cast<_Node*>(__curr->_M_next);
+ forward_list __tmp(__n, __val, get_allocator());
+ return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
}
+ else
+ return iterator(const_cast<_Node_base*>(__pos._M_node));
}
template<typename _Tp, typename _Alloc>
- template<typename _Pred>
- void
+ template<typename _InputIterator, typename>
+ typename forward_list<_Tp, _Alloc>::iterator
forward_list<_Tp, _Alloc>::
- remove_if(_Pred __pred)
+ insert_after(const_iterator __pos,
+ _InputIterator __first, _InputIterator __last)
{
- _Node* __curr = static_cast<_Node*>(&this->_M_impl._M_head);
- while (_Node* __temp = static_cast<_Node*>(__curr->_M_next))
- {
- if (__pred(__temp->_M_value))
- this->_M_erase_after(__curr);
- else
- __curr = static_cast<_Node*>(__curr->_M_next);
- }
+ forward_list __tmp(__first, __last, get_allocator());
+ if (!__tmp.empty())
+ return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
+ else
+ return iterator(const_cast<_Node_base*>(__pos._M_node));
}
+#if __cplusplus > 201703L
+# define _GLIBCXX20_ONLY(__expr) __expr
+#else
+# define _GLIBCXX20_ONLY(__expr)
+#endif
+
template<typename _Tp, typename _Alloc>
- void
+ auto
forward_list<_Tp, _Alloc>::
- unique()
+ remove(const _Tp& __val) -> __remove_return_type
{
- iterator __first = begin();
- iterator __last = end();
- if (__first == __last)
- return;
- iterator __next = __first;
- while (++__next != __last)
+ size_type __removed __attribute__((__unused__)) = 0;
+ _Node_base* __curr = &this->_M_impl._M_head;
+ _Node_base* __extra = nullptr;
+
+ while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
{
- if (*__first == *__next)
- erase_after(__first);
- else
- __first = __next;
- __next = __first;
+ if (*__tmp->_M_valptr() == __val)
+ {
+ if (__tmp->_M_valptr() != std::__addressof(__val))
+ {
+ this->_M_erase_after(__curr);
+ _GLIBCXX20_ONLY( __removed++ );
+ continue;
+ }
+ else
+ __extra = __curr;
+ }
+ __curr = __curr->_M_next;
+ }
+
+ if (__extra)
+ {
+ this->_M_erase_after(__extra);
+ _GLIBCXX20_ONLY( __removed++ );
}
+ return _GLIBCXX20_ONLY( __removed );
}
+ template<typename _Tp, typename _Alloc>
+ template<typename _Pred>
+ auto
+ forward_list<_Tp, _Alloc>::
+ remove_if(_Pred __pred) -> __remove_return_type
+ {
+ size_type __removed __attribute__((__unused__)) = 0;
+ _Node_base* __curr = &this->_M_impl._M_head;
+ while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
+ {
+ if (__pred(*__tmp->_M_valptr()))
+ {
+ this->_M_erase_after(__curr);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ __curr = __curr->_M_next;
+ }
+ return _GLIBCXX20_ONLY( __removed );
+ }
+
template<typename _Tp, typename _Alloc>
template<typename _BinPred>
- void
+ auto
forward_list<_Tp, _Alloc>::
- unique(_BinPred __binary_pred)
+ unique(_BinPred __binary_pred) -> __remove_return_type
{
- iterator __first = begin();
- iterator __last = end();
- if (__first == __last)
- return;
- iterator __next = __first;
- while (++__next != __last)
+ iterator __first = begin();
+ iterator __last = end();
+ if (__first == __last)
+ return _GLIBCXX20_ONLY(0);
+ size_type __removed __attribute__((__unused__)) = 0;
+ iterator __next = __first;
+ while (++__next != __last)
{
if (__binary_pred(*__first, *__next))
- erase_after(__first);
+ {
+ erase_after(__first);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
else
__first = __next;
__next = __first;
}
+ return _GLIBCXX20_ONLY( __removed );
}
+#undef _GLIBCXX20_ONLY
+
template<typename _Tp, typename _Alloc>
template<typename _Comp>
void
forward_list<_Tp, _Alloc>::
merge(forward_list&& __list, _Comp __comp)
{
- _Fwd_list_node_base* __node = &this->_M_impl._M_head;
- while (__node->_M_next && __list._M_impl._M_head._M_next)
- {
- if (__comp(static_cast<_Node*>
- (__list._M_impl._M_head._M_next)->_M_value,
- static_cast<_Node*>
- (__node->_M_next)->_M_value))
- __node->_M_transfer_after(&__list._M_impl._M_head,
- __list._M_impl._M_head._M_next);
- __node = __node->_M_next;
- }
- if (__list._M_impl._M_head._M_next)
- {
- __node->_M_next = __list._M_impl._M_head._M_next;
- __list._M_impl._M_head._M_next = 0;
- }
- }
+ _Node_base* __node = &this->_M_impl._M_head;
+ while (__node->_M_next && __list._M_impl._M_head._M_next)
+ {
+ if (__comp(*static_cast<_Node*>
+ (__list._M_impl._M_head._M_next)->_M_valptr(),
+ *static_cast<_Node*>
+ (__node->_M_next)->_M_valptr()))
+ __node->_M_transfer_after(&__list._M_impl._M_head,
+ __list._M_impl._M_head._M_next);
+ __node = __node->_M_next;
+ }
- template<typename _Tp, typename _Alloc>
- void
- forward_list<_Tp, _Alloc>::
- reverse()
- { this->_M_impl._M_head._M_reverse_after(); }
+ if (__list._M_impl._M_head._M_next)
+ *__node = std::move(__list._M_impl._M_head);
+ }
template<typename _Tp, typename _Alloc>
bool
operator==(const forward_list<_Tp, _Alloc>& __lx,
- const forward_list<_Tp, _Alloc>& __ly)
+ const forward_list<_Tp, _Alloc>& __ly)
{
// We don't have size() so we need to walk through both lists
// making sure both iterators are valid.
- typename std::forward_list<_Tp, _Alloc>::const_iterator __ix
- = __lx.cbegin();
- typename std::forward_list<_Tp, _Alloc>::const_iterator __iy
- = __ly.cbegin();
+ auto __ix = __lx.cbegin();
+ auto __iy = __ly.cbegin();
while (__ix != __lx.cend() && __iy != __ly.cend())
- {
- if (*__ix != *__iy)
- return false;
- ++__ix;
- ++__iy;
- }
+ {
+ if (!(*__ix == *__iy))
+ return false;
+ ++__ix;
+ ++__iy;
+ }
if (__ix == __lx.cend() && __iy == __ly.cend())
- return true;
+ return true;
else
- return false;
+ return false;
}
-_GLIBCXX_END_NAMESPACE // namespace std
+ template<typename _Tp, class _Alloc>
+ template<typename _Comp>
+ void
+ forward_list<_Tp, _Alloc>::
+ sort(_Comp __comp)
+ {
+ // If `next' is nullptr, return immediately.
+ _Node* __list = static_cast<_Node*>(this->_M_impl._M_head._M_next);
+ if (!__list)
+ return;
-#endif /* _FORWARD_LIST_TCC */
+ unsigned long __insize = 1;
+
+ while (1)
+ {
+ _Node* __p = __list;
+ __list = nullptr;
+ _Node* __tail = nullptr;
+
+ // Count number of merges we do in this pass.
+ unsigned long __nmerges = 0;
+ while (__p)
+ {
+ ++__nmerges;
+ // There exists a merge to be done.
+ // Step `insize' places along from p.
+ _Node* __q = __p;
+ unsigned long __psize = 0;
+ for (unsigned long __i = 0; __i < __insize; ++__i)
+ {
+ ++__psize;
+ __q = static_cast<_Node*>(__q->_M_next);
+ if (!__q)
+ break;
+ }
+
+ // If q hasn't fallen off end, we have two lists to merge.
+ unsigned long __qsize = __insize;
+
+ // Now we have two lists; merge them.
+ while (__psize > 0 || (__qsize > 0 && __q))
+ {
+ // Decide whether next node of merge comes from p or q.
+ _Node* __e;
+ if (__psize == 0)
+ {
+ // p is empty; e must come from q.
+ __e = __q;
+ __q = static_cast<_Node*>(__q->_M_next);
+ --__qsize;
+ }
+ else if (__qsize == 0 || !__q)
+ {
+ // q is empty; e must come from p.
+ __e = __p;
+ __p = static_cast<_Node*>(__p->_M_next);
+ --__psize;
+ }
+ else if (!__comp(*__q->_M_valptr(), *__p->_M_valptr()))
+ {
+ // First node of q is not lower; e must come from p.
+ __e = __p;
+ __p = static_cast<_Node*>(__p->_M_next);
+ --__psize;
+ }
+ else
+ {
+ // First node of q is lower; e must come from q.
+ __e = __q;
+ __q = static_cast<_Node*>(__q->_M_next);
+ --__qsize;
+ }
+
+ // Add the next node to the merged list.
+ if (__tail)
+ __tail->_M_next = __e;
+ else
+ __list = __e;
+ __tail = __e;
+ }
+
+ // Now p has stepped `insize' places along, and q has too.
+ __p = __q;
+ }
+ __tail->_M_next = nullptr;
+
+ // If we have done only one merge, we're finished.
+ // Allow for nmerges == 0, the empty list case.
+ if (__nmerges <= 1)
+ {
+ this->_M_impl._M_head._M_next = __list;
+ return;
+ }
+
+ // Otherwise repeat, merging lists twice the size.
+ __insize *= 2;
+ }
+ }
+
+_GLIBCXX_END_NAMESPACE_CONTAINER
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif /* _FORWARD_LIST_TCC */
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