Method hashCodeImpl

output/java_guava/1.4.16/Sets.java:1442–1450

An implementation for Set#hashCode().

(Set<?> s)

  static int hashCodeImpl(Set<?> s) {
    int hashCode = 0;
    for (Object o : s) {
      hashCode += o != null ? o.hashCode() : 0;
      hashCode = ~~hashCode;
      // Needed to deal with unusual integer overflow in GWT.
    }
    return hashCode;
  }

  /**
   * An implementation for {@link Set#equals(Object)}.