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Suspend ZIO.as & ZStream.as again #1822

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Merged
merged 3 commits into from
Sep 26, 2019
Merged

Suspend ZIO.as & ZStream.as again #1822

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07a5852
Suspend ZIO.as & ZStream.as again
neko-kai Sep 24, 2019
a84d43d
Use ConstFn in .as because it's actually put into ZIO.map directly, s…
neko-kai Sep 24, 2019
7daaf59
Fix ConstFn for use in ZStream
neko-kai Sep 25, 2019
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11 changes: 9 additions & 2 deletions core/shared/src/main/scala/zio/ZIO.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,7 @@ sealed trait ZIO[-R, +E, +A] extends Serializable { self =>
/**
* Maps the success value of this effect to the specified constant value.
*/
final def as[B](b: B): ZIO[R, E, B] = self.flatMap(new ZIO.ConstFn(() => b))
final def as[B](b: => B): ZIO[R, E, B] = self.flatMap(new ZIO.ConstZIOFn(() => b))

/**
* Maps the error value of this effect to the specified constant value.
Expand Down Expand Up @@ -2649,13 +2649,20 @@ object ZIO extends ZIOFunctions {
new ZIO.Succeed(underlying(a))
}

final class ConstFn[R, E, A, B](override val underlying: () => B) extends ZIOFn1[A, ZIO[R, E, B]] {
final class ConstZIOFn[R, E, A, B](override val underlying: () => B) extends ZIOFn1[A, ZIO[R, E, B]] {
def apply(a: A): ZIO[R, E, B] = {
val _ = a
new ZIO.Succeed(underlying())
}
}

final class ConstFn[A, B](override val underlying: () => B) extends ZIOFn1[A, B] {
def apply(a: A): B = {
val _ = a
underlying()
}
}

final class BracketReleaseFn[R, E, A, B](override val underlying: A => ZIO[R, Nothing, _])
extends ZIOFn2[A, Exit[E, B], ZIO[R, Nothing, _]] {
override def apply(a: A, exit: Exit[E, B]): ZIO[R, Nothing, _] = {
Expand Down
2 changes: 1 addition & 1 deletion streams/shared/src/main/scala/zio/stream/ZStream.scala
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Expand Up @@ -550,7 +550,7 @@ class ZStream[-R, +E, +A](val process: ZManaged[R, E, Pull[R, E, A]]) extends Se
/**
* Maps the success values of this stream to the specified constant value.
*/
final def as[B](b: B): ZStream[R, E, B] = map(_ => b)
final def as[B](b: => B): ZStream[R, E, B] = map(new ZIO.ConstFn(() => b))

/**
* Returns a stream whose failure and success channels have been mapped by
Expand Down