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diff --git a/ACE/ace/Unbounded_Set.h b/ACE/ace/Unbounded_Set.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file Unbounded_Set.h
+ *
+ *  $Id$
+ *
+ *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef ACE_UNBOUNDED_SET_H
+#define ACE_UNBOUNDED_SET_H
+#include /**/ "ace/pre.h"
+
+#include "ace/Node.h"
+#include "ace/os_include/os_stddef.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class ACE_Allocator;
+
+/**
+ * @class ACE_Unbounded_Set_Iterator
+ *
+ * @brief Implement an iterator over an unbounded set.
+ */
+template <class T>
+class ACE_Unbounded_Set_Iterator
+{
+public:
+  // = Initialization method.
+  ACE_Unbounded_Set_Iterator (ACE_Unbounded_Set<T> &s, int end = 0);
+
+  // = Iteration methods.
+
+  /// Pass back the <next_item> that hasn't been seen in the Set.
+  /// Returns 0 when all items have been seen, else 1.
+  int next (T *&next_item);
+
+  /// Move forward by one element in the set.  Returns 0 when all the
+  /// items in the set have been seen, else 1.
+  int advance (void);
+
+  /// Move to the first element in the set.  Returns 0 if the
+  /// set is empty, else 1.
+  int first (void);
+
+  /// Returns 1 when all items have been seen, else 0.
+  int done (void) const;
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  // = STL styled iteration, compare, and reference functions.
+
+  /// Postfix advance.
+  ACE_Unbounded_Set_Iterator<T> operator++ (int);
+
+  /// Prefix advance.
+  ACE_Unbounded_Set_Iterator<T>& operator++ (void);
+
+  /// Returns a reference to the internal element <this> is pointing to.
+  T& operator* (void);
+
+  /// Check if two iterators point to the same position
+  bool operator== (const ACE_Unbounded_Set_Iterator<T> &) const;
+  bool operator!= (const ACE_Unbounded_Set_Iterator<T> &) const;
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+
+private:
+
+  /// Pointer to the current node in the iteration.
+  ACE_Node<T> *current_;
+
+  /// Pointer to the set we're iterating over.
+  ACE_Unbounded_Set<T> *set_;
+};
+
+/**
+ * @class ACE_Unbounded_Set_Const_Iterator
+ *
+ * @brief Implement an const iterator over an unbounded set.
+ */
+template <class T>
+class ACE_Unbounded_Set_Const_Iterator
+{
+public:
+  // = Initialization method.
+  ACE_Unbounded_Set_Const_Iterator (const ACE_Unbounded_Set<T> &s, int end = 0);
+
+  // = Iteration methods.
+
+  /// Pass back the @a next_item that hasn't been seen in the Set.
+  /// @return Returns 0 when all items have been seen, else 1.
+  int next (T *&next_item);
+
+  /// Move forward by one element in the set.  Returns 0 when all the
+  /// items in the set have been seen, else 1.
+  int advance (void);
+
+  /// Move to the first element in the set.  Returns 0 if the
+  /// set is empty, else 1.
+  int first (void);
+
+  /// Returns 1 when all items have been seen, else 0.
+  int done (void) const;
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  // = STL styled iteration, compare, and reference functions.
+
+  /// Postfix advance.
+  ACE_Unbounded_Set_Const_Iterator<T> operator++ (int);
+
+  /// Prefix advance.
+  ACE_Unbounded_Set_Const_Iterator<T>& operator++ (void);
+
+  /// Returns a reference to the internal element <this> is pointing to.
+  T& operator* (void);
+
+  /// Check if two iterators point to the same position
+  bool operator== (const ACE_Unbounded_Set_Const_Iterator<T> &) const;
+  bool operator!= (const ACE_Unbounded_Set_Const_Iterator<T> &) const;
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+
+private:
+
+  /// Pointer to the current node in the iteration.
+  ACE_Node<T> *current_;
+
+  /// Pointer to the set we're iterating over.
+  const ACE_Unbounded_Set<T> *set_;
+};
+
+/**
+ * @class ACE_Unbounded_Set
+ *
+ * @brief Implement a simple unordered set of <T> of unbounded size.
+ *
+ * This implementation of an unordered set uses a circular
+ * linked list with a dummy node.  This implementation does not
+ * allow duplicates, but it maintains FIFO ordering of insertions.
+ *
+ * <b> Requirements and Performance Characteristics</b>
+ *   - Internal Structure
+ *       Circular linked list
+ *   - Duplicates allowed?
+ *       No
+ *   - Random access allowed?
+ *       No
+ *   - Search speed
+ *       Linear
+ *   - Insert/replace speed
+ *       Linear
+ *   - Iterator still valid after change to container?
+ *       Yes
+ *   - Frees memory for removed elements?
+ *       Yes
+ *   - Items inserted by
+ *       Value
+ *   - Requirements for contained type
+ *       -# Default constructor
+ *       -# Copy constructor
+ *       -# operator=
+ *       -# operator==
+ *
+ */
+template <class T>
+class ACE_Unbounded_Set
+{
+public:
+  friend class ACE_Unbounded_Set_Iterator<T>;
+  friend class ACE_Unbounded_Set_Const_Iterator<T>;
+
+  // Trait definition.
+  typedef ACE_Unbounded_Set_Iterator<T> ITERATOR;
+  typedef ACE_Unbounded_Set_Iterator<T> iterator;
+  typedef ACE_Unbounded_Set_Const_Iterator<T> CONST_ITERATOR;
+  typedef ACE_Unbounded_Set_Const_Iterator<T> const_iterator;
+
+  // = Initialization and termination methods.
+  /// Constructor.  Use user specified allocation strategy
+  /// if specified.
+  /**
+   * Initialize an empty set using the allocation strategy of the user if
+   * provided.
+   */
+  ACE_Unbounded_Set (ACE_Allocator *alloc = 0);
+
+  /// Copy constructor.
+  /**
+   * Initialize this set to be an exact copy of the set provided.
+   */
+  ACE_Unbounded_Set (const ACE_Unbounded_Set<T> &);
+
+  /// Assignment operator.
+  /**
+   * Perform a deep copy of the rhs into the lhs.
+   */
+  ACE_Unbounded_Set<T> & operator= (const ACE_Unbounded_Set<T> &);
+
+  /// Destructor.
+  /**
+   * Destroy the nodes of the set.
+   */
+  ~ACE_Unbounded_Set (void);
+
+  // = Check boundary conditions.
+
+  /// Returns 1 if the container is empty, otherwise returns 0.
+  /**
+   * Constant time is_empty check.
+   */
+  int is_empty (void) const;
+
+  /// Returns 0.
+  /**
+   * Always returns 0 since the set can never fill up.
+   */
+  int is_full (void) const;
+
+  // = Classic unordered set operations.
+
+  /// Linear insertion of an item.
+  /**
+   * Insert @a new_item into the set (doesn't allow duplicates).
+   * Returns -1 if failures occur, 1 if item is already present, else
+   * 0.
+   */
+  int insert (const T &new_item);
+
+  /// Insert @a item at the tail of the set (doesn't check for
+  /// duplicates).
+  /**
+   * Constant time insert at the end of the set.
+   */
+  int insert_tail (const T &item);
+
+  /// Linear remove operation.
+  /**
+   * Remove first occurrence of @a item from the set.  Returns 0 if
+   * it removes the item, -1 if it can't find the item, and -1 if a
+   * failure occurs.
+   */
+  int remove (const T &item);
+
+  /// Finds if @a item occurs in the set.  Returns 0 if find succeeds,
+  /// else -1.
+  /**
+   * Performs a linear find operation.
+   */
+  int find (const T &item) const;
+
+  /// Size of the set.
+  /**
+   * Access the size of the set.
+   */
+  size_t size (void) const;
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  /// Reset the <ACE_Unbounded_Set> to be empty.
+  /**
+   * Delete the nodes of the set.
+   */
+  void reset (void);
+
+  // = STL-styled unidirectional iterator factory.
+  ACE_Unbounded_Set_Iterator<T> begin (void);
+  ACE_Unbounded_Set_Iterator<T> end (void);
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+
+private:
+  /// Delete all the nodes in the Set.
+  void delete_nodes (void);
+
+  /// Copy nodes into this set.
+  void copy_nodes (const ACE_Unbounded_Set<T> &);
+
+  /// Head of the linked list of Nodes.
+  ACE_Node<T> *head_;
+
+  /// Current size of the set.
+  size_t cur_size_;
+
+  /// Allocation strategy of the set.
+  ACE_Allocator *allocator_;
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/Unbounded_Set.inl"
+#endif /* __ACE_INLINE__ */
+
+#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
+#include "ace/Unbounded_Set.cpp"
+#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
+
+#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
+#pragma implementation ("Unbounded_Set.cpp")
+#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
+
+#include /**/ "ace/post.h"
+#endif /* ACE_UNBOUNDED_SET_H */