return new WeightedWeakValueReference<>(queue, value, entry, weight);
    }
  }

  /** References a soft value. */
  static final class WeightedSoftValueReference<K, V> extends SoftValueReference<K, V> {
    final int weight;

    WeightedSoftValueReference(
        ReferenceQueue<V> queue, V referent, ReferenceEntry<K, V> entry, int weight) {
      super(queue, referent, entry);
      this.weight = weight;