+
+struct dataset_callbacks
+ {
+ /* Called whenever a procedure completes execution or whenever the
+ dictionary within the dataset is modified (though not when it is
+ replaced by a new dictionary). */
+ void (*changed) (void *aux);
+
+ /* Called whenever a transformation is added or removed. NON_EMPTY is true
+ if after the change there is at least one transformation, false if there
+ are no transformations. */
+ void (*transformations_changed) (bool non_empty, void *aux);
+ };
+
+void dataset_set_callbacks (struct dataset *, const struct dataset_callbacks *,
+ void *aux);