/// <inheritdoc/>>
 public override void ForEach(Action <T> action)
 {
     BackingStore.AsParallel().WithMergeOptions(ParallelMergeOptions.FullyBuffered)
     .ForAll(row => row.ForEach(lh => lh.ForEach(action)));
 }
 /// <inheritdoc/>>
 public override void ForEach(FastIteratorFunctor <T> functor)
 {
     BackingStore.AsParallel().WithMergeOptions(ParallelMergeOptions.FullyBuffered)
     .ForAll(row => row.ForEach(lh => lh.ForEach(functor)));
 }