defer r.mu.Unlock()

	if r.w == r.r {
		if r.isFull {
			return r.size
		}
		return 0
	}

	if r.w > r.r {
		return r.w - r.r
	}

	return r.size - r.r + r.w
}

// Capacity returns the size of the underlying buffer.
func (r *RingBuffer) Capacity() int {
	return r.size
}

// Free returns the length of available bytes to write.
func (r *RingBuffer) Free() int {

            }
        }
        return flags;
    }


    /**
     * Returns the challenge for this message.
     *
     * @return A <code>byte[]</code> containing the challenge.
     */
    public byte[] getChallenge () {
        return this.challenge;
    }


    /**
     * Sets the challenge for this message.
     *

				line, s = s, nil
			}
			if !yield(line[:len(line):len(line)]) {
				return
			}
		}
		return
	}
}

// explodeSeq returns an iterator over the runes in s.
func explodeSeq(s []byte) iter.Seq[[]byte] {
	return func(yield func([]byte) bool) {
		for len(s) > 0 {
			_, size := utf8.DecodeRune(s)
			if !yield(s[:size:size]) {
				return
			}
			s = s[size:]
		}
	}
}

   * Optional.map}, except when {@code function} returns {@code null}. In this case this method
   * throws an exception, whereas the Java 8+ method returns {@code Optional.absent()}.
   *
   * @throws NullPointerException if the function returns {@code null}
   * @since 12.0
   */
  public abstract <V> Optional<V> transform(Function<? super T, V> function);

  /**

                  }
                  return p;
                }
                return -1;
              }

              @Override
              public int separatorEnd(int separatorPosition) {
                return separatorPosition + separator.length();
              }
            };
          }
        });
  }

  /**

        return packages;
    }

    /**
     * The key that can must used to identify the configuration using the
     * {@link javax.inject.Named} annotation.
     */
    public String getKey() {
        return key;
    }

    /**
     * Returns the configuration for this extension.
     */
    public XmlNode getConfiguration() {
        return configuration;
    }

    }
    return result;
  }

  @WeakOuter
  class EntrySet extends Multisets.EntrySet<E> {
    @Override
    Multiset<E> multiset() {
      return AbstractMultiset.this;
    }

    @Override
    public Iterator<Entry<E>> iterator() {
      return entryIterator();
    }

    @Override
    public int size() {
      return distinctElements();
    }
  }

      case 0:
        return none();
      case 1:
        return is(sequence.charAt(0));
      case 2:
        return isEither(sequence.charAt(0), sequence.charAt(1));
      default:
        // TODO(lowasser): is it potentially worth just going ahead and building a precomputed
        // matcher?
        return new AnyOf(sequence);
    }
  }

  /**

func (rt ResyncStatusType) isValid() bool {
	return rt != NoResync
}

func (rt ResyncStatusType) String() string {
	switch rt {
	case ResyncStarted:
		return "Ongoing"
	case ResyncCompleted:
		return "Completed"
	case ResyncFailed:
		return "Failed"
	case ResyncPending:
		return "Pending"
	case ResyncCanceled:
		return "Canceled"
	default:
		return ""
	}
}

	return &ArrayOf[T]{
		ePool: sync.Pool{New: func() any {
			return newFn()
		}},
	}
}

// New returns a new empty Array.
func (p *ArrayOf[T]) New() *Array[T] {
	return &Array[T]{
		p: p,
	}
}

// NewWith returns a new Array with the provided value (not copied).
func (p *ArrayOf[T]) NewWith(val []T) *Array[T] {
	return &Array[T]{
		p:   p,
		val: val,
	}
}