size_t value_cnt, casenumber case_cnt,
const struct casereader_class *, void *);
-void *casereader_dynamic_cast (struct casereader *, struct casereader_class *);
+void *casereader_dynamic_cast (struct casereader *, const struct casereader_class *);
\f
/* Casereader class for random-access data sources. */
struct casereader_random_class