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diff --git a/examples/sql/overview/subclass4/main.h b/examples/sql/overview/subclass4/main.h
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+++ b/examples/sql/overview/subclass4/main.h
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+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qapplication.h>
+#include <qsqldatabase.h>
+#include <qsqlcursor.h>
+#include "../connection.h"
+
+class TQSqlRecord;
+
+class InvoiceItemCursor : public TQSqlCursor
+{
+    public:
+	InvoiceItemCursor();
+    protected:
+	TQVariant calculateField( const TQString & name );
+};
+
+