* CompactHashMap.
   */

  private long[] requireLinks() {
    return requireNonNull(links);
  }

  private long link(int i) {
    return requireLinks()[i];
  }

  private void setLink(int i, long value) {
    requireLinks()[i] = value;
  }

  /*

   * CompactHashMap.
   */

  private long[] requireLinks() {
    return requireNonNull(links);
  }

  private long link(int i) {
    return requireLinks()[i];
  }

  private void setLink(int i, long value) {
    requireLinks()[i] = value;
  }

  /*