struct PartialRangeFrom.Iterator The iterator for a PartialRangeFrom instance. Inheritance IteratorProtocol View Protocol Hierarchy → Import import Swift 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. Returns: The next element in the underlying sequence, if a next element exists; otherwise, nil. Declaration mutating func next() -> PartialRangeFrom<Bound>.Bound?