* (unless there are {@link Double#NaN NaN} values, see below); otherwise, the result is the average
 * of the values which would appear at the indexes floor(x) and ceil(x) weighted by (1-frac(x)) and
 * frac(x) respectively. This is the same definition as used by Excel and by S, it is the Type 7
 * definition in <a

            roundFloorAsDouble = roundArbitrarily;
            roundFloor = roundArbitrarilyAsLong;
            roundCeilingAsDouble = Math.nextUp(roundArbitrarily);
            roundCeiling = (long) Math.ceil(roundCeilingAsDouble);
          } else {
            roundCeilingAsDouble = roundArbitrarily;
            roundCeiling = roundArbitrarilyAsLong;
            roundFloorAsDouble = DoubleUtils.nextDown(roundArbitrarily);

    for (Table.Cell<? extends R, ? extends C, ? extends V> cell : table.cellSet()) {
      put(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
    }
  }

  @LazyInit @CheckForNull private transient Set<Cell<R, C, V>> cellSet;

  @Override
  public Set<Cell<R, C, V>> cellSet() {
    Set<Cell<R, C, V>> result = cellSet;

        checkNotNull(cell.getValue(), "value");
        @SuppressWarnings("unchecked") // all supported methods are covariant
        Cell<R, C, V> immutableCell = (Cell<R, C, V>) cell;
        cells.add(immutableCell);
      } else {
        put(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
      }
      return this;
    }

    /**

  public void testImmutableEntrySerialization() {
    Cell<String, Integer, Character> entry = Tables.immutableCell("foo", 1, 'a');
    SerializableTester.reserializeAndAssert(entry);
  }

  public void testImmutableEntryToString() {
    Cell<String, Integer, Character> entry = Tables.immutableCell("foo", 1, 'a');
    assertEquals("(foo,1)=a", entry.toString());

    Cell<@Nullable String, @Nullable Integer, @Nullable Character> nullEntry =

      }
    }
  }

  public void testKnownUtf8Hashing() {
    for (Cell<HashFunction, String, String> cell : KNOWN_HASHES.cellSet()) {
      HashFunction func = cell.getRowKey();
      String input = cell.getColumnKey();
      String expected = cell.getValue();
      assertEquals(
          String.format(Locale.ROOT, "Known hash for hash(%s, UTF_8) failed", input),

   * row, and so on.
   *
   * <p>Each cell is an immutable snapshot of a row key / column key / value mapping, taken at the
   * time the cell is returned by a method call to the set or its iterator.
   */
  @Override
  public Set<Cell<R, C, V>> cellSet() {
    return super.cellSet();
  }

  @Override
  Iterator<Cell<R, C, V>> cellIterator() {
    return new CellIterator();
  }

    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Cell<String, Integer, Character> cell = table.cellSet().iterator().next();
    assertEquals(Tables.immutableCell("foo", 1, 'a'), cell);
    assertEquals((Character) 'a', table.put("foo", 1, 'd'));
    assertEquals(Tables.immutableCell("foo", 1, 'd'), cell);
  }

  public void testRowMissing() {

    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Cell<String, Integer, Character> cell = table.cellSet().iterator().next();
    assertEquals(Tables.immutableCell("foo", 1, 'a'), cell);
    assertEquals((Character) 'a', table.put("foo", 1, 'd'));
    assertEquals(Tables.immutableCell("foo", 1, 'd'), cell);
  }

  public void testRowMissing() {

    ImmutableTable.Builder<Character, Integer, String> builder = new ImmutableTable.Builder<>();

    final StringHolder holder = new StringHolder();
    holder.string = "foo";
    Table.Cell<Character, Integer, String> mutableCell =
        new Tables.AbstractCell<Character, Integer, String>() {
          @Override
          public Character getRowKey() {
            return 'K';
          }