int (long parallelismThreshold, ToIntBiFunction<? super K, ? super V> transformer, int basis, IntBinaryOperator reducer) { if (transformer == null || reducer == null) throw new NullPointerException(); return new MapReduceMappingsToIntTask<K,V> (null, batchFor(parallelismThreshold), 0, 0, table, null, transformer, basis, reducer).invoke(); }