Hashmap *hashmap_copy(Hashmap *h);
int hashmap_put(Hashmap *h, const void *key, void *value);
+int hashmap_replace(Hashmap *h, const void *key, void *value);
void* hashmap_get(Hashmap *h, const void *key);
void* hashmap_remove(Hashmap *h, const void *key);
+void* hashmap_remove_value(Hashmap *h, const void *key, void *value);
int hashmap_merge(Hashmap *h, Hashmap *other);