return Iterators.size(entryIterator());
    }
  }

  @Override
  public RangeSet<C> subRangeSet(Range<C> view) {
    return view.equals(Range.all()) ? this : new SubRangeSet(view);
  }

  private final class SubRangeSet extends TreeRangeSet<C> {
    private final Range<C> restriction;

    SubRangeSet(Range<C> restriction) {
      super(
          new SubRangeSetRangesByLowerBound<C>(

          return super.writeReplace();
        }
      };
    }
  }

  /** Returns a view of the intersection of this range set with the given range. */
  @Override
  public ImmutableRangeSet<C> subRangeSet(Range<C> range) {
    if (!isEmpty()) {
      Range<C> span = span();
      if (range.encloses(span)) {
        return this;
      } else if (range.isConnected(span)) {