Packages

trait Ask[F[_], +E] extends Serializable

Ask[F, E] lets you access an E value in the F[_] context.

Intuitively, this means that an E value is required as an input to get "out" of the F[_] context.

Ask[F, E] has one external law:

def askAddsNoEffects[A](fa: F[A]) = {
  (ask *> fa) <-> fa
}

Ask[F, E] has one internal law:

def readerIsAskAndMap[A](f: E => A) = {
  ask.map(f) <-> reader(f)
}
Annotations
@implicitNotFound("Could not find an implicit instance of Ask[${F}, ${E}]. If you have a\nvalue of type ${E} in scope, or a way of computing one, you may want to construct\na value of type Kleisli for this call-site, rather than type ${F}. An example type:\n\n Kleisli[${F}, ${E}, *]\n\nIf you do not have an ${E} or a way of getting one, you should add\nan implicit parameter of this type to your function. For example:\n\n (implicit fask: Ask[${F}, ${E}])\n")
Source
Ask.scala
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Serializable, AnyRef, Any
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  1. Ask
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Abstract Value Members

  1. abstract def applicative: Applicative[F]
  2. abstract def ask[E2 >: E]: F[E2]

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
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  4. final def asInstanceOf[T0]: T0
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    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  8. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
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    @throws(classOf[java.lang.Throwable])
  9. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  10. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  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()
  14. final def notifyAll(): Unit
    Definition Classes
    AnyRef
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    @native()
  15. def reader[A](f: (E) => A): F[A]
  16. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  17. def toString(): String
    Definition Classes
    AnyRef → Any
  18. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  19. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  20. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from Serializable

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