@Override
  final ImmutableSet<Cell<R, C, V>> createCellSet() {
    return isEmpty() ? ImmutableSet.<Cell<R, C, V>>of() : new CellSet();
  }

  @WeakOuter
  private final class CellSet extends IndexedImmutableSet<Cell<R, C, V>> {
    @Override
    public int size() {
      return RegularImmutableTable.this.size();
    }

    @Override
    Cell<R, C, V> get(int index) {
      return getCell(index);
    }