hashmap_find
bool hashmap_find(const struct hashmap *map, long key, long *value);
hashmap_find((map), (long)(key), hashmap_cast_ptr(value))
bool hashmap_find(const struct hashmap *map, long key, long *value);
hashmap_find((map), (long)(key), hashmap_cast_ptr(value))
if (hashmap_find(&hwm->events, key.type_and_num, /*value=*/NULL))