void histogram_clear(struct histogram *h) {
uint64_t key;
struct box_count *box;
itable_firstkey(h->buckets);
while(itable_nextkey(h->buckets, &key, (void **) &box)) {
free(box);
}
h->total_count = 0;
h->max_value = 0;
h->min_value = 0;
h->mode = 0;
itable_clear(h->buckets);
}
void itable_delete(struct itable *h)
{
itable_clear(h);
free(h->buckets);
free(h);
}
