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Stream concatenation.

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This commit is contained in:
Rob Rix 2015-09-17 14:14:01 -04:00
parent 587ffcbb24
commit b3c0e92d2a
1 changed files with 10 additions and 0 deletions
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10
prototype/Doubt/Stream.swift
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@ -41,6 +41,16 @@ public enum Stream<A>: NilLiteralConvertible, SequenceType {
} }
public func concat(other: Stream) -> Stream {
switch self {
case .Nil:
return other
case let .Cons(first, rest):
return .Cons(first, rest.map { $0.concat(other) })
}
}
public init(nilLiteral: ()) { public init(nilLiteral: ()) {
self = .Nil self = .Nil
} }