shadedshapeless

LowPriority

sealed trait LowPriority extends Serializable

Evidence that no implicit instance of the same type as the one being currently searched is available elsewhere.

Added to an implicit def like

implicit def genericThing[F, G]
(implicit
  ev: LowPriority,
  gen: Generic.Aux[F, G],
  underlying: Thing[G]
): Thing[F] = ???

it prevents genericThing to provide an instance of Thing[F] if an implicit one is already available elsewhere. This effectively gives genericThing a lower priority than the already existing implicits - without having to deal with cumbersome priority scoping.

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Inherited from Serializable

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