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diff --git a/externals/ace/Refcountable_T.h b/externals/ace/Refcountable_T.h
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+++ b/externals/ace/Refcountable_T.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file   Refcountable_T.h
+ *
+ *  $Id: Refcountable_T.h 81409 2008-04-24 08:30:48Z johnnyw $
+ *
+ * @author Doug Schmidt
+ * @author Johnny Willemsen
+ */
+//=============================================================================
+#ifndef ACE_REFCOUNTABLE_T_H
+#define ACE_REFCOUNTABLE_T_H
+#include /**/ "ace/pre.h"
+
+#include /**/ "ace/ACE_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/Atomic_Op.h"
+#include "ace/Synch_Traits.h"
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+template <class ACE_LOCK>
+class ACE_Refcountable_T
+{
+public:
+  /// Destructor.
+  virtual ~ACE_Refcountable_T (void);
+
+  // = Increment/Decrement refcount
+  long increment (void);
+  long decrement (void);
+
+  /// Returns the current refcount.
+  long refcount (void) const;
+
+protected:
+  /// Protected constructor.
+  ACE_Refcountable_T (long refcount);
+
+  /// Current refcount.
+  ACE_Atomic_Op <ACE_LOCK, long> refcount_;
+};
+
+typedef ACE_Refcountable_T<ACE_Null_Mutex> ACE_Refcountable;
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/Refcountable_T.inl"
+#endif /* __ACE_INLINE__ */
+
+#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
+#include "ace/Refcountable_T.cpp"
+#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
+
+#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
+#pragma implementation ("Refcountable_T.cpp")
+#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
+
+#include /**/ "ace/post.h"
+#endif /*ACE_REFCOUNTABLE_T_H*/