Packages

trait Tag[T] extends AnyTag

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:

import distage.ModuleDef

class MyModule[F[_]: Monad: TagK] extends ModuleDef {
  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 in structural refinement methods, e.g. T in 

Tag[{ def x: T}]

They do resolve in refinement type members however, e.g. 

Tag[ Any { type Out = 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/7mind/izumi/issues/374

Annotations
@implicitNotFound( ... )
See also

"Lightweight Scala Reflection and why Dotty needs TypeTags reimplemented" https://blog.7mind.io/lightweight-reflection.html

izumi.reflect.macrortti.LTag - summoner for izumi.reflect.macrortti.LightTypeTag that does not resolve type parameters

izumi.reflect.macrortti.LTag.Weak - summoner for izumi.reflect.macrortti.LightTypeTag that does not resolve type parameters and allows unresolved ("weak") type parameters to be part of a tag

Linear Supertypes
AnyTag, Serializable, Serializable, AnyRef, Any
Ordering
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Inherited
  1. Tag
  2. AnyTag
  3. Serializable
  4. Serializable
  5. AnyRef
  6. Any
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def closestClass: Class[_]

    Closest class found for the type or for a LUB of all intersection members in case of an intersection type.

    Closest class found for the type or for a LUB of all intersection members in case of an intersection type.

    A Scala type may not have an associated JVM class, as such this class may not be sufficient to create instances of T

    Only if tag.hasPreciseClass returns true it may be safe to reflect on closestClass

    Definition Classes
    Tag → AnyTag
  2. abstract def tag: LightTypeTag
    Definition Classes
    Tag → AnyTag

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native() @HotSpotIntrinsicCandidate()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. final def equals(that: Any): Boolean
    Definition Classes
    AnyTag → AnyRef → Any
  8. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  9. final def hasPreciseClass: Boolean
    Definition Classes
    AnyTag
  10. final def hashCode(): Int
    Definition Classes
    AnyTag → AnyRef → Any
  11. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  12. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  14. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  15. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  16. final def toString(): String
    Definition Classes
    Tag → AnyRef → Any
  17. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  18. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  19. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] ) @Deprecated
    Deprecated

Inherited from AnyTag

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped