struct casewriter *exclude; /* Writer that gets filtered cases, or NULL. */
};
-static struct casereader_class casereader_filter_class;
+static const struct casereader_class casereader_filter_class;
/* Creates and returns a casereader whose content is a filtered
version of the data in SUBREADER. Only the cases for which
}
/* Filtering casereader class. */
-static struct casereader_class casereader_filter_class =
+static const struct casereader_class casereader_filter_class =
{
casereader_filter_read,
casereader_filter_destroy,