struct SetIterator<Element : Hashable> An iterator over the members of a Set<Element>. Inheritance CustomReflectable, IteratorProtocol View Protocol Hierarchy → Import import Swift Instance Variables var customMirror: Mirror A mirror that reflects the iterator. Declaration var customMirror: Mirror { get } Instance Methods mutating func next() Advances to the next element and returns it, or nil if no next element exists. Once nil has been returned, all subsequent calls return nil. Declaration mutating func next() -> Element?