requirePredecessors()[srcIndex] = 0;
    requireSuccessors()[srcIndex] = 0;
  }

  @Override
  void resizeEntries(int newCapacity) {
    super.resizeEntries(newCapacity);
    predecessor = Arrays.copyOf(requirePredecessors(), newCapacity);
    successor = Arrays.copyOf(requireSuccessors(), newCapacity);
  }

  @Override
  int firstEntryIndex() {
    return firstEntry;
  }

  @Override

    requirePredecessors()[srcIndex] = 0;
    requireSuccessors()[srcIndex] = 0;
  }

  @Override
  void resizeEntries(int newCapacity) {
    super.resizeEntries(newCapacity);
    predecessor = Arrays.copyOf(requirePredecessors(), newCapacity);
    successor = Arrays.copyOf(requireSuccessors(), newCapacity);
  }

  @Override
  int firstEntryIndex() {
    return firstEntry;
  }

  @Override