Iterator

import Swift

@frozen struct LazySequence<Base> where Base : Sequence

A sequence containing the same elements as a Base sequence, but on which some operations such as map and filter are implemented lazily.

associatedtype Iterator : IteratorProtocol

A type that provides the sequence’s iteration interface and encapsulates its iteration state.

protocol Sequence<Element>

A type that provides sequential, iterated access to its elements.

var elements: LazySequence<Base>.Elements { get }

The Base (presumably non-lazy) sequence from which self was created.

var underestimatedCount: Int { get }

func makeIterator() -> LazySequence<Base>.Iterator

typealias Element = Base.Element

typealias Elements = Base