invert

Description:

public static HashMap<V,K> invert<K,V> (HashMap<K,V> map, HashFunc<V> hash_func, EqualFunc<V> equal_func, owned ConflictResolverFunc<K>? on_conflict = null)

Returns a new map with keys and values swapped.

If multiple entries map to the same value key, later entries overwrite earlier ones unless conflict resolver is provided.

Parameters:

map	the source map.
hash_func	hash function for value type V.
equal_func	equality function for value type V.
on_conflict	optional resolver for value-key collisions.

Returns:

a new inverted map.