class MutableLongDiffSetsImpl implements MutableLongDiffSets {

    @Override
    public boolean isEmpty()
    {
        return added.isEmpty() && removed.isEmpty();
    }

    public  MutableLongDiffSetsImpl( MutableLongSet added, MutableLongSet removed, CollectionsFactory collectionsFactory );
    public  MutableLongDiffSetsImpl( CollectionsFactory collectionsFactory );

}