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diff --git a/src/stlplus/persistence/persistent_exceptions.hpp b/src/stlplus/persistence/persistent_exceptions.hpp
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+++ b/src/stlplus/persistence/persistent_exceptions.hpp
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+#ifndef STLPLUS_PERSISTENT_EXCEPTIONS
+#define STLPLUS_PERSISTENT_EXCEPTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Exceptions thrown by persistence routines
+
+////////////////////////////////////////////////////////////////////////////////
+#include "persistence_fixes.hpp"
+#include <stdexcept>
+#include <string>
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  // exception thrown if you try to dump or restore an illegal polymorphic type
+  class persistent_illegal_type : public std::logic_error
+  {
+  public:
+    persistent_illegal_type(const std::string& type) throw();
+    persistent_illegal_type(unsigned key) throw();
+    ~persistent_illegal_type(void) throw();
+  };
+
+  // exception thrown if a dump fails for any reason - but typically because the output stream couldn't take the data
+  class persistent_dump_failed : public std::runtime_error
+  {
+  public:
+    persistent_dump_failed(const std::string& message) throw();
+    ~persistent_dump_failed(void) throw();
+  };
+
+  // exception thrown if you try to restore from an out of date or unrecognised byte stream
+  class persistent_restore_failed : public std::runtime_error
+  {
+  public:
+    persistent_restore_failed(const std::string& message) throw();
+    ~persistent_restore_failed(void) throw();
+  };
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus
+
+#endif