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+// Safe sequence implementation  -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010, 2011
+// 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
+// <http://www.gnu.org/licenses/>.
+
+/** @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 <debug/debug.h>
+#include <debug/macros.h>
+#include <debug/functions.h>
+#include <debug/safe_base.h>
+
+namespace __gnu_debug
+{
+  template<typename _Iterator, typename _Sequence>
+    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<typename _Type>
+    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 simple function object that returns true if the passed-in
+   *  value is equal to the stored value. */
+  template <typename _Type>
+    class _Equal_to
+    {
+      _Type __value;
+
+    public:
+      explicit _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<typename _Iterator>
+    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 @a safe sequence type that
+   * tracks iterators that reference it.
+   *
+   * The class template %_Safe_sequence simplifies the construction of
+   * @a 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<typename _Sequence>
+    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. @c pred will be invoked with the normal iterators nested
+	  in the safe ones. */
+      template<typename _Predicate>
+        void
+        _M_invalidate_if(_Predicate __pred);
+
+      /** Transfers all iterators @c x that reference @c from sequence,
+	  are not singular, and for which @c pred(x) returns @c
+	  true. @c pred will be invoked with the normal iterators nested
+	  in the safe ones. */
+      template<typename _Predicate>
+        void
+        _M_transfer_from_if(_Safe_sequence& __from, _Predicate __pred);
+    };
+} // namespace __gnu_debug
+
+#include <debug/safe_sequence.tcc>
+
+#endif