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object Tag

Source
Tag.scala
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Type Members

  1. final class TagOf[T] extends ~>[Id.Id, [α$0$]TagKind.@@[α$0$, T]]

    See also

    Tag.of

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
    Definition Classes
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  3. final def ==(arg0: Any): Boolean
    Definition Classes
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  4. def apply[A, T](a: A): @@[A, T]

    subst specialized to Id.

    subst specialized to Id.

    Annotations
    @inline()
    To do

    According to Miles, @specialized doesn't help here. Maybe manually specialize.

  5. final def asInstanceOf[T0]: T0
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  6. def clone(): AnyRef
    Attributes
    protected[java.lang]
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    @native() @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
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    Annotations
    @native()
  11. def hashCode(): Int
    Definition Classes
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    Annotations
    @native()
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. val k: TagKind
  14. final def ne(arg0: AnyRef): Boolean
    Definition Classes
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  15. final def notify(): Unit
    Definition Classes
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    @native()
  16. final def notifyAll(): Unit
    Definition Classes
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    @native()
  17. def of[T]: TagOf[T]

    Variants of apply, subst, and unsubst that require specifying the tag type but are more likely to infer the other type parameters.

  18. def subst[A, F[_], T](fa: F[A]): F[@@[A, T]]

    Add a tag T to A.

    Add a tag T to A.

    NB: It is unwise to subst or unsubst a tag in an F that is sensitive to the A type within. For example, if F is a GADT, rather than a normal ADT, it will be type-correct, but probably not what you expect. For "normal" types like List and function types, it is safe. More broadly, if it is possible to write a legal scalaz.InvariantFunctor over the parameter, subst of that parameter is safe. This is because subst effectively provides evidence that a type and all its tagged variants are equal; tagging works to discriminate types because that fact is not implicit to the compiler.

    We do not have a type role system in Scala with which to declare the exact situations under which subst is safe. If we did, we would declare that subst is safe if and only if the parameter has "representational" or "phantom" role.

    Annotations
    @inline()
  19. def subst1[G[_], F[_[_]], T](fa: F[G]): F[[α]TagKind.@@[G[α], T]]

    Add a tag T to G[_]

  20. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
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  21. def toString(): String
    Definition Classes
    AnyRef → Any
  22. def unsubst[A, F[_], T](fa: F[@@[A, T]]): F[A]

    Remove the tag T, leaving A.

    Remove the tag T, leaving A.

    Annotations
    @inline()
  23. def unsubst1[G[_], F[_[_]], T](fa: F[[α]TagKind.@@[G[α], T]]): F[G]

    Remove the tag T, leaving G

    Remove the tag T, leaving G

    Annotations
    @inline()
  24. def unwrap[A, T](a: @@[A, T]): A

    unsubst specialized to Id.

    unsubst specialized to Id.

    Annotations
    @inline()
  25. final def wait(): Unit
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    @throws( ... )
  26. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  27. final def wait(arg0: Long): Unit
    Definition Classes
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    @native() @throws( ... )

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