returns an optional instance with no contained reference.comparison to java.util.optional : this method is equivalent to java 8 's optional.empty . concode_field_sep long serialVersionUID concode_field_sep Iterable<T> presentInstances concode_elem_sep Optional<T> fromNullable concode_elem_sep Optional<V> transform concode_elem_sep T or concode_elem_sep Optional<T> or concode_elem_sep T or concode_elem_sep int hashCode concode_elem_sep Optional<T> of concode_elem_sep T get concode_elem_sep boolean equals concode_elem_sep boolean isPresent concode_elem_sep String toString concode_elem_sep Set<T> asSet concode_elem_sep T orNull
Optional < T > function ( ) { return Absent . withType ( ) ; }