void *hashmap_get2(Hashmap *h, const void *key, void **rkey);
bool hashmap_contains(Hashmap *h, const void *key);
void *hashmap_remove(Hashmap *h, const void *key);
+void *hashmap_remove2(Hashmap *h, const void *key, void **rkey);
void *hashmap_remove_value(Hashmap *h, const void *key, void *value);
int hashmap_remove_and_put(Hashmap *h, const void *old_key, const void *new_key, void *value);
int hashmap_remove_and_replace(Hashmap *h, const void *old_key, const void *new_key, void *value);