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diff --git a/libstdc++-v3/include/debug/safe_sequence.h b/libstdc++-v3/include/debug/safe_sequence.h
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+// Safe sequence implementation -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2009
+// 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/safe_sequence.h
+ * This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H
+#define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1
+
+#include
+#include
+#include
+#include
+
+namespace __gnu_debug
+{
+ template
+ class _Safe_iterator;
+
+ /** A simple function object that returns true if the passed-in
+ * value is not equal to the stored value. It saves typing over
+ * using both bind1st and not_equal.
+ */
+ template
+ class _Not_equal_to
+ {
+ _Type __value;
+
+ public:
+ explicit _Not_equal_to(const _Type& __v) : __value(__v) { }
+
+ bool
+ operator()(const _Type& __x) const
+ { return __value != __x; }
+ };
+
+ /** A function object that returns true when the given random access
+ iterator is at least @c n steps away from the given iterator. */
+ template
+ class _After_nth_from
+ {
+ typedef typename std::iterator_traits<_Iterator>::difference_type
+ difference_type;
+
+ _Iterator _M_base;
+ difference_type _M_n;
+
+ public:
+ _After_nth_from(const difference_type& __n, const _Iterator& __base)
+ : _M_base(__base), _M_n(__n) { }
+
+ bool
+ operator()(const _Iterator& __x) const
+ { return __x - _M_base >= _M_n; }
+ };
+
+ /**
+ * @brief Base class for constructing a "safe" sequence type that
+ * tracks iterators that reference it.
+ *
+ * The class template %_Safe_sequence simplifies the construction of
+ * "safe" sequences that track the iterators that reference the
+ * sequence, so that the iterators are notified of changes in the
+ * sequence that may affect their operation, e.g., if the container
+ * invalidates its iterators or is destructed. This class template
+ * may only be used by deriving from it and passing the name of the
+ * derived class as its template parameter via the curiously
+ * recurring template pattern. The derived class must have @c
+ * iterator and @const_iterator types that are instantiations of
+ * class template _Safe_iterator for this sequence. Iterators will
+ * then be tracked automatically.
+ */
+ template
+ class _Safe_sequence : public _Safe_sequence_base
+ {
+ public:
+ /** Invalidates all iterators @c x that reference this sequence,
+ are not singular, and for which @c pred(x) returns @c
+ true. The user of this routine should be careful not to make
+ copies of the iterators passed to @p pred, as the copies may
+ interfere with the invalidation. */
+ template
+ void
+ _M_invalidate_if(_Predicate __pred);
+
+ /** Transfers all iterators that reference this memory location
+ to this sequence from whatever sequence they are attached
+ to. */
+ template
+ void
+ _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x);
+ };
+
+ template
+ template
+ void
+ _Safe_sequence<_Sequence>::
+ _M_invalidate_if(_Predicate __pred)
+ {
+ typedef typename _Sequence::iterator iterator;
+ typedef typename _Sequence::const_iterator const_iterator;
+
+ __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
+ for (_Safe_iterator_base* __iter = _M_iterators; __iter;)
+ {
+ iterator* __victim = static_cast(__iter);
+ __iter = __iter->_M_next;
+ if (!__victim->_M_singular())
+ {
+ if (__pred(__victim->base()))
+ __victim->_M_invalidate_single();
+ }
+ }
+
+ for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;)
+ {
+ const_iterator* __victim = static_cast(__iter2);
+ __iter2 = __iter2->_M_next;
+ if (!__victim->_M_singular())
+ {
+ if (__pred(__victim->base()))
+ __victim->_M_invalidate_single();
+ }
+ }
+ }
+
+ template
+ template
+ void
+ _Safe_sequence<_Sequence>::
+ _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x)
+ {
+ _Safe_sequence_base* __from = __x._M_sequence;
+ if (!__from)
+ return;
+
+ typedef typename _Sequence::iterator iterator;
+ typedef typename _Sequence::const_iterator const_iterator;
+
+ __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
+ for (_Safe_iterator_base* __iter = __from->_M_iterators; __iter;)
+ {
+ iterator* __victim = static_cast(__iter);
+ __iter = __iter->_M_next;
+ if (!__victim->_M_singular() && __victim->base() == __x.base())
+ __victim->_M_attach_single(static_cast<_Sequence*>(this));
+ }
+
+ for (_Safe_iterator_base* __iter2 = __from->_M_const_iterators;
+ __iter2;)
+ {
+ const_iterator* __victim = static_cast(__iter2);
+ __iter2 = __iter2->_M_next;
+ if (!__victim->_M_singular() && __victim->base() == __x.base())
+ __victim->_M_attach_single(static_cast<_Sequence*>(this));
+ }
+ }
+} // namespace __gnu_debug
+
+#endif