trait WithTags extends UniverseGeneric

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WithTags
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  1. trait HKTag[T] extends AnyRef

    Internal unsafe API representing a poly-kinded, higher-kinded type tag.

    Internal unsafe API representing a poly-kinded, higher-kinded type tag.

    To create a Tag* implicit for an arbitrary kind use the following syntax:

    type TagK5[K[_, _, _, _, _]] = HKTag[ { type Arg[A, B, C, D, E] = K[A, B, C, D, E] } ]

    As an argument to HKTag, you should specify the type variables your type parameter will take and apply them to it, in order.

    type TagFGC[K[_[_, _], _[_], _[_[_], _, _, _]] = HKTag[ { type Arg[A[_, _], B[_], C[_[_], _, _, _]] = K[A, B, C] } ]

    A convenience macro Tag.auto.T is available to automatically create a type lambda from a type of any kind:

    def x[K[_[_, _], _[_], _[_[_], _, _, _]: Tag.auto.T]: Tag.auto.T[K] = implicitly[Tag.auto.T[K]]
  2. trait LowPriorityHKTagInstances extends AnyRef
  3. trait LowPriorityTagInstances extends AnyRef
  4. type ScalaReflectTypeTag[T] = scala.reflect.api.Universe.TypeTag[T]
  5. type ScalaReflectWeakTypeTag[T] = scala.reflect.api.Universe.WeakTypeTag[T]
  6. trait Tag[T] extends AnyRef

    Like scala.reflect.api.TypeTags.TypeTag, but supports higher-kinded type tags via TagK type class.

    Like scala.reflect.api.TypeTags.TypeTag, but supports higher-kinded type tags via TagK type class.

    In context of DI this lets you define modules parameterized by higher-kinded type parameters. This is especially helpful for applying tagless final style

    Example:

    class MyModule[F[_]: Monad: TagK] {
      make[MyService[F]]
      make[F[Int]].named("lucky-number").from(Monad[F].pure(7))
    }

    Without a TagK constraint above, this example would fail with no TypeTag available for MyService[F] error

    Currently some limitations apply as to when a Tag will be correctly constructed: * Type Parameters do not yet resolve inside structural refinements, e.g. T in

    Tag[{ def x: T}]

    * Type Parameters do not yet resolve inside higher-kinded type lambdas, e.g. T in

    TagK[Either[T, ?]]

    * TagK* does not resolve for constructors with bounded parameters, e.g. S in

    class Abc[S <: String]; TagK[Abc]

    (You can still have a bound in partial application: e.g.

    class Abc[S <: String, A]; TagK[Abc["hi", ?]]

    * Further details at https://github.com/pshirshov/izumi-r2/pull/369

    Annotations
    @implicitNotFound( ... )
  7. type TagK[K[_]] = HKTag[AnyRef { type Arg[A] = K[A] }]

    TagK is a scala.reflect.api.TypeTags.TypeTag for higher-kinded types.

    TagK is a scala.reflect.api.TypeTags.TypeTag for higher-kinded types.

    Example:

    def containerTypesEqual[F[_]: TagK, K[_]: TagK]): Boolean = TagK[F].tag.tpe =:= TagK[K].tag.tpe
    
    containerTypesEqual[Set, collection.immutable.Set] == true
    containerTypesEqual[Array, List] == false
  8. type TagK3[K[_, _, _]] = HKTag[AnyRef { type Arg[A, B, C] = K[A,B,C] }]
  9. type TagKK[K[_, _]] = HKTag[AnyRef { type Arg[A, B] = K[A,B] }]
  10. type TagObject = Tag.type
  11. type TagT[K[_[_]]] = HKTag[AnyRef { type Arg[A[_]] = K[A] }]
  12. type TagTK[K[_[_], _]] = HKTag[AnyRef { type Arg[A[_], B] = K[A,B] }]
  13. type TagTK3[K[_[_], _, _, _]] = HKTag[AnyRef { type Arg[A[_], B, C, D] = K[A,B,C,D] }]
  14. type TagTKK[K[_[_], _, _]] = HKTag[AnyRef { type Arg[A[_], B, C] = K[A,B,C] }]
  15. trait WeakTag[T] extends AnyRef
  16. trait WeakTagInstances0 extends WeakTagInstances1
  17. trait WeakTagInstances1 extends AnyRef

Abstract Value Members

  1. abstract val u: Universe
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  1. final def !=(arg0: Any): Boolean
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  18. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(arg0: Long): Unit
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  20. object HKTag extends LowPriorityHKTagInstances
  21. object Tag extends LowPriorityTagInstances
  22. object TagK
  23. object TagK3
  24. object TagKK
  25. object TagT
  26. object TagTK
  27. object TagTK3
  28. object TagTKK
  29. object WeakTag extends WeakTagInstances0

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