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Cache ZStream identity functions #10310

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Merged
kyri-petrou merged 1 commit into from
Dec 22, 2025
Merged

Cache ZStream identity functions #10310

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16 changes: 7 additions & 9 deletions streams/shared/src/main/scala/zio/stream/ZChannel.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1644,20 +1644,18 @@ object ZChannel {
private[zio] final case class Finalizer[Env, OutErr, OutDone](finalizer: Exit[OutErr, OutDone] => URIO[Env, Any])
extends Continuation[Env, Any, Any, Any, OutErr, Nothing, Nothing, OutDone, Nothing]

private[this] def SuccessIdentity(implicit
trace: Trace
): Any => ZChannel[Any, Any, Any, Any, Nothing, Nothing, Any] =
ZChannel.succeedNow(_)
private[this] val SuccessIdentity: Any => ZChannel[Any, Any, Any, Any, Nothing, Nothing, Any] =
ZChannel.succeedNow(_)(Trace.empty)
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@hearnadam hearnadam Dec 22, 2025

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it might be best to instantiate the class directly.


private[zio] def successIdentity[Z](implicit trace: Trace): Z => ZChannel[Any, Any, Any, Any, Nothing, Nothing, Z] =
private[stream] def successIdentity[Z](implicit
trace: Trace
): Z => ZChannel[Any, Any, Any, Any, Nothing, Nothing, Z] =
SuccessIdentity.asInstanceOf[Z => ZChannel[Any, Any, Any, Any, Nothing, Nothing, Z]]

private[this] def FailCauseIdentity(implicit
trace: Trace
): Cause[Any] => ZChannel[Any, Any, Any, Any, Any, Nothing, Nothing] =
private[this] val FailCauseIdentity: Cause[Any] => ZChannel[Any, Any, Any, Any, Any, Nothing, Nothing] =
ZChannel.refailCause

private[zio] def failCauseIdentity[E](implicit
private[stream] def failCauseIdentity[E](implicit
trace: Trace
): Cause[E] => ZChannel[Any, Any, Any, Any, E, Nothing, Nothing] =
FailCauseIdentity.asInstanceOf[Cause[E] => ZChannel[Any, Any, Any, Any, E, Nothing, Nothing]]
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