*
* Call this function before the slab falls out of scope to avoid
* leaking memory.
+ *
+ * - void deep_clear_indegree(struct indegree *, void (*free_fn)(int*))
+ *
+ * Empties the slab, similar to clear_indegree(), but in addition it
+ * calls the given 'free_fn' for each slab entry to release any
+ * additional memory that might be owned by the entry (but not the
+ * entry itself!).
+ * Note that 'free_fn' might be called even for entries for which no
+ * indegree_at() call has been made; in this case 'free_fn' is invoked
+ * with a pointer to a zero-initialized location.
*/
#define define_commit_slab(slabname, elemtype) \