trait ApplicativeLocal[F[_], E] extends ApplicativeAsk[F, E] with Serializable
ApplicativeLocal[F, E]
lets you alter the E
value that is observed by an F[A]
value
using ask
; the modification can only be observed from within that F[A]
value.
ApplicativeLocal[F, E]
has three external laws:
def askReflectsLocal(f: E => E) = { local(f)(ask) <-> ask map f } def localPureIsPure[A](a: A, f: E => E) = { local(f)(pure(a)) <-> pure(a) } def localDistributesOverAp[A, B](fa: F[A], ff: F[A => B], f: E => E) = { local(f)(ff ap fa) <-> local(f)(ff) ap local(f)(fa) }
ApplicativeLocal
has one internal law:
def scopeIsLocalConst(fa: F[A], e: E) = { scope(e)(fa) <-> local(_ => e)(fa) }
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Abstract Value Members
-
abstract
val
applicative: Applicative[F]
- Definition Classes
- ApplicativeAsk
-
abstract
def
ask: F[E]
- Definition Classes
- ApplicativeAsk
- abstract def local[A](f: (E) ⇒ E)(fa: F[A]): F[A]
-
abstract
def
reader[A](f: (E) ⇒ A): F[A]
- Definition Classes
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- abstract def scope[A](e: E)(fa: F[A]): F[A]
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final
def
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def
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def
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