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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