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diff --git a/src/stlplus/persistence/persistent_callback.hpp b/src/stlplus/persistence/persistent_callback.hpp
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+++ b/src/stlplus/persistence/persistent_callback.hpp
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+#ifndef STLPLUS_PERSISTENT_CALLBACK
+#define STLPLUS_PERSISTENT_CALLBACK
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Persistence for pointers to polymorphic classes using the callback approach.
+
+//   This works on a set of classes. Each subclass has a set of callback
+//   (non-method) functions that enable create/dump/restore operations. Each
+//   subclass must be registered with the persistence dump/restore context so
+//   that the system knows how to handle it.
+
+//   This approach is suited to classes that cannot be modified to add
+//   persistence methods. See persistent_interface for a more C++-like way of
+//   handling polymorphism.
+
+//   Objects are always dumped/restored as pointers to the superclass T.
+
+//   Multiple pointers to the same object are handled in the same way as for
+//   simple pointers
+
+//   Only classes registered with the context can be dumped and restored as
+//   polymorphic types - see dump_context::register_callback and
+//   restore_context::register_callback. Attempting to use any unrecognised class
+//   will throw an exception.
+
+////////////////////////////////////////////////////////////////////////////////
+
+#include "persistence_fixes.hpp"
+#include "persistent_contexts.hpp"
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  template<typename T>
+  void dump_callback(dump_context&, const T* const data)
+    throw(persistent_dump_failed);
+
+  template<typename T>
+  void restore_callback(restore_context&, T*& data)
+    throw(persistent_restore_failed);
+
+} // end namespace stlplus
+
+  ////////////////////////////////////////////////////////////////////////////////
+#include "persistent_callback.tpp"
+#endif