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[Scala 3] deprecate Delegation ahead of Scala 3 removal #880

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[Scala 3] deprecate Delegation ahead of Scala 3 removal #880

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b9fa1fd
deprecate(misc): mark Delegation @deprecated ahead of Scala 3 removal
halotukozak Jun 2, 2026
6ab6cd7
fix(misc): reformat `@deprecated` Scaladoc for Delegation
halotukozak Jun 2, 2026
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12 changes: 12 additions & 0 deletions core/src/main/scala/com/avsystem/commons/misc/Delegation.scala
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Expand Up @@ -2,11 +2,23 @@ package com.avsystem.commons
package misc

/** A typeclass which witnesses that type `A` can be wrapped into trait or abstract class `B`
*
* @deprecated
* `Delegation` is being removed in the Scala 3 release of scala-commons. The blackbox macros have no Scala 3
* counterpart; write the delegating wrapper manually (`new TargetTrait { def x = source.x; ... }`).
*/
@deprecated(
"Delegation will be removed in the Scala 3 release of scala-commons. Write the delegating wrapper manually.",
since = "2.29.0",
)
trait Delegation[A, B] {
def delegate(a: A): B
}

@deprecated(
"Delegation will be removed in the Scala 3 release of scala-commons. Write the delegating wrapper manually.",
since = "2.29.0",
)
object Delegation {
implicit def materializeDelegation[A, B]: Delegation[A, B] =
macro com.avsystem.commons.macros.misc.DelegationMacros.materializeDelegation[A, B]
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