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diff --git a/ACE/ace/Obstack_T.h b/ACE/ace/Obstack_T.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Obstack_T.h
+ *
+ *  $Id$
+ *
+ *  @author Doug Schmidt <schmidt@cs.wustl.edu>
+ *  @author Nanbor Wang <nanbor@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef ACE_OBSTACK_T_H
+#define ACE_OBSTACK_T_H
+
+#include /**/ "ace/pre.h"
+
+#include "ace/Obchunk.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class ACE_Allocator;
+
+/**
+ * @class ACE_Obstack_T
+ *
+ * @brief Define a simple "mark and release" memory allocation utility.
+ *
+ * The implementation is similar to the GNU obstack utility,
+ * which is used extensively in the GCC compiler.
+ */
+template <class ACE_CHAR_T>
+class ACE_Obstack_T
+{
+public:
+  // = Initialization and termination methods.
+  ACE_Obstack_T (size_t size = (4096 * sizeof (ACE_CHAR_T)) - sizeof (ACE_Obchunk),
+                 ACE_Allocator *allocator_strategy = 0);
+  ~ACE_Obstack_T (void);
+
+  /// Request Obstack to prepare a block at least @a len long for building
+  /// a new string.  Return -1 if fail, 0 if success.
+  int request (size_t len);
+
+  /// Inserting a new ACE_CHAR_T \a c into the current building
+  /// block without freezing (null terminating) the block.
+  /// This function will create new chunk by checking the
+  /// boundary of current Obchunk.  Return
+  /// the location \a c gets inserted to, or 0 if error.
+  ACE_CHAR_T *grow (ACE_CHAR_T c);
+
+  /// Inserting a new ACE_CHAR_T \a c into the current building
+  /// block without freezing (null terminating) the block and without
+  /// checking for out-of-bound error.
+  void grow_fast (ACE_CHAR_T c);
+
+  /// Freeze the current building block by null terminating it.
+  /// Return the starting address of the current building block, 0
+  /// if error occurs.
+  ACE_CHAR_T *freeze (void);
+
+  /// Copy the data into the current Obchunk and freeze the current
+  /// block.  Return the starting address of the current building
+  /// block, 0 if error occurs.  @a len specify the string length,
+  /// not the actually data size.
+  ACE_CHAR_T *copy (const ACE_CHAR_T *data,
+              size_t len);
+
+  /// Return the maximum @a size
+  size_t size (void) const;
+
+  /// "Unwind" the stack. If @a obj is a null pointer, everything allocated
+  /// in the stack is released. Otherwise, @a obj must be an address of an
+  /// object allocated in the stack. In this case, @a obj is released along
+  /// with everthing allocated in the Obstack since @a obj.
+  void unwind (void* obj);
+
+  /// "Release" the entire stack of Obchunks, putting it back on the free
+  /// list.
+  void release (void);
+
+  /// Dump the state of an object.
+  void dump (void) const;
+
+  /// Declare the dynamic allocation hooks.
+  ACE_ALLOC_HOOK_DECLARE;
+
+protected:
+  class ACE_Obchunk *new_chunk (void);
+
+  /// Search through the list of Obchunks and release them. Helper funtion
+  /// used by unwind.
+  void unwind_i (void* obj);
+
+  /// Pointer to the allocator used by this Obstack.
+  ACE_Allocator *allocator_strategy_;
+
+  /// Current size of the Obstack;
+  size_t size_;
+
+  // Don't change the order of the following two fields.
+  /// Head of the Obchunk chain.
+  class ACE_Obchunk *head_;
+
+  /// Pointer to the current Obchunk.
+  class ACE_Obchunk *curr_;
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/Obstack_T.inl"
+#endif /* __ACE_INLINE__ */
+
+#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
+#include "ace/Obstack_T.cpp"
+#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
+
+#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
+#pragma implementation ("Obstack_T.cpp")
+#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
+
+#include /**/ "ace/post.h"
+#endif /* ACE_OBSTACK_T_H */