object Unique extends Serializable
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- Unique.scala
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!=(arg0: Any): Boolean
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def
apply[F[_]](implicit arg0: Concurrent[F]): F[Unique]
Unique provides uniqueness by relying on object equality, which means that
new Unique
is actually a side-effect in this case.Unique provides uniqueness by relying on object equality, which means that
new Unique
is actually a side-effect in this case.We want to make sure we preserve referential transparency when using instrances, but imposing a
Sync
bound is not desirable here, since it forces a very strong constraint on user code for something that is not only an internal implementation detail, but also has zero impact on meaningful behaviour for the user, unlike for example internal concurrency.Furthermore,
Unique
creation has the following properties: - it's synchronous - it's infallible - it's not created in contexts that affect stack safety such as iterationGiven all these reasons, we suspend it via
flatMap
instead of usingSync[F].delay
. Do not try this at home. -
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- def sync[F[_]](implicit arg0: Sync[F]): F[Unique]
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(Since version ) see corresponding Javadoc for more information.