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Add a concat overload over Memo<Stream>.

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This commit is contained in:
Rob Rix 2015-09-17 14:34:39 -04:00
parent 25a88b3c69
commit afaa68b1e0
1 changed files with 7 additions and 3 deletions
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10
prototype/Doubt/Stream.swift
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@ -47,10 +47,14 @@ public enum Stream<A>: NilLiteralConvertible, SequenceType {
}
public func concat(other: Stream) -> Stream {
public func concat(other: Memo<Stream>) -> Stream {
return analysis(
ifCons: { .Cons($0, $1.map { $0.concat(other) }) },
ifNil: const(other))
ifCons: { .Cons($0, $1.map { $0.concat(other.value) }) },
ifNil: { other.value })
}
public func concat(other: Stream) -> Stream {
return concat(Memo(evaluated: other))
}