--- /dev/null
+// Safe container/iterator base implementation -*- C++ -*-
+
+// Copyright (C) 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_unordered_base.h
+ * This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H
+#define _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H 1
+
+#include <debug/safe_base.h>
+
+namespace __gnu_debug
+{
+ class _Safe_unordered_container_base;
+
+ /** \brief Basic functionality for a @a safe iterator.
+ *
+ * The %_Safe_local_iterator_base base class implements the functionality
+ * of a safe local iterator that is not specific to a particular iterator
+ * type. It contains a pointer back to the container it references
+ * along with iterator version information and pointers to form a
+ * doubly-linked list of local iterators referenced by the container.
+ *
+ * This class must not perform any operations that can throw an
+ * exception, or the exception guarantees of derived iterators will
+ * be broken.
+ */
+ class _Safe_local_iterator_base : public _Safe_iterator_base
+ {
+ protected:
+ /** Initializes the iterator and makes it singular. */
+ _Safe_local_iterator_base()
+ { }
+
+ /** Initialize the iterator to reference the container pointed to
+ * by @p __seq. @p __constant is true when we are initializing a
+ * constant local iterator, and false if it is a mutable local iterator.
+ * Note that @p __seq may be NULL, in which case the iterator will be
+ * singular. Otherwise, the iterator will reference @p __seq and
+ * be nonsingular.
+ */
+ _Safe_local_iterator_base(const _Safe_sequence_base* __seq, bool __constant)
+ { this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); }
+
+ /** Initializes the iterator to reference the same container that
+ @p __x does. @p __constant is true if this is a constant
+ iterator, and false if it is mutable. */
+ _Safe_local_iterator_base(const _Safe_local_iterator_base& __x,
+ bool __constant)
+ { this->_M_attach(__x._M_sequence, __constant); }
+
+ _Safe_local_iterator_base&
+ operator=(const _Safe_local_iterator_base&);
+
+ explicit
+ _Safe_local_iterator_base(const _Safe_local_iterator_base&);
+
+ ~_Safe_local_iterator_base() { this->_M_detach(); }
+
+ _Safe_unordered_container_base*
+ _M_get_container() const _GLIBCXX_NOEXCEPT;
+
+ public:
+ /** Attaches this iterator to the given container, detaching it
+ * from whatever container it was attached to originally. If the
+ * new container is the NULL pointer, the iterator is left
+ * unattached.
+ */
+ void _M_attach(_Safe_sequence_base* __seq, bool __constant);
+
+ /** Likewise, but not thread-safe. */
+ void _M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw ();
+
+ /** Detach the iterator for whatever container it is attached to,
+ * if any.
+ */
+ void _M_detach();
+
+ /** Likewise, but not thread-safe. */
+ void _M_detach_single() throw ();
+ };
+
+ /**
+ * @brief Base class that supports tracking of local iterators that
+ * reference an unordered container.
+ *
+ * The %_Safe_unordered_container_base class provides basic support for
+ * tracking iterators into an unordered container. Containers that track
+ * iterators must derived from %_Safe_unordered_container_base publicly, so
+ * that safe iterators (which inherit _Safe_iterator_base) can
+ * attach to them. This class contains four linked lists of
+ * iterators, one for constant iterators, one for mutable
+ * iterators, one for constant local iterators, one for mutable local
+ * iterators and a version number that allows very fast
+ * invalidation of all iterators that reference the container.
+ *
+ * This class must ensure that no operation on it may throw an
+ * exception, otherwise @a safe containers may fail to provide the
+ * exception-safety guarantees required by the C++ standard.
+ */
+ class _Safe_unordered_container_base : public _Safe_sequence_base
+ {
+ typedef _Safe_sequence_base _Base;
+ public:
+ /// The list of mutable local iterators that reference this container
+ _Safe_iterator_base* _M_local_iterators;
+
+ /// The list of constant local iterators that reference this container
+ _Safe_iterator_base* _M_const_local_iterators;
+
+ protected:
+ // Initialize with a version number of 1 and no iterators
+ _Safe_unordered_container_base()
+ : _M_local_iterators(0), _M_const_local_iterators(0)
+ { }
+
+ /** Notify all iterators that reference this container that the
+ container is being destroyed. */
+ ~_Safe_unordered_container_base()
+ { this->_M_detach_all(); }
+
+ /** Detach all iterators, leaving them singular. */
+ void
+ _M_detach_all();
+
+ /** Swap this container with the given container. This operation
+ * also swaps ownership of the iterators, so that when the
+ * operation is complete all iterators that originally referenced
+ * one container now reference the other container.
+ */
+ void
+ _M_swap(_Safe_unordered_container_base& __x);
+
+ public:
+ /** Attach an iterator to this container. */
+ void
+ _M_attach_local(_Safe_iterator_base* __it, bool __constant);
+
+ /** Likewise but not thread safe. */
+ void
+ _M_attach_local_single(_Safe_iterator_base* __it, bool __constant) throw ();
+
+ /** Detach an iterator from this container */
+ void
+ _M_detach_local(_Safe_iterator_base* __it);
+
+ /** Likewise but not thread safe. */
+ void
+ _M_detach_local_single(_Safe_iterator_base* __it) throw ();
+ };
+} // namespace __gnu_debug
+
+#endif
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