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Adding a way to create a Kleisli with just F[B] #1090

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merged 4 commits into from
Jun 8, 2016
Merged

Adding a way to create a Kleisli with just F[B] #1090

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4a5fea2
Adding a way to create a Kleisli with just F[B]
Jun 4, 2016
6f9deb6
Don't actually need the applicative
Jun 4, 2016
026cdea
Changing .pureF to .const and having the liftT on TransLift use .const
Jun 5, 2016
08675c1
Renaming to Kleisli.lift, from Kleisli.const
Jun 7, 2016
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5 changes: 4 additions & 1 deletion core/src/main/scala/cats/data/Kleisli.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,9 @@ object Kleisli extends KleisliInstances with KleisliFunctions

private[data] sealed trait KleisliFunctions {

def lift[F[_], A, B](x: F[B]): Kleisli[F, A, B] =
Kleisli(_ => x)

def pure[F[_], A, B](x: B)(implicit F: Applicative[F]): Kleisli[F, A, B] =
Kleisli(_ => F.pure(x))

Expand Down Expand Up @@ -121,7 +124,7 @@ private[data] sealed abstract class KleisliInstances extends KleisliInstances0 {
new TransLift[Kleisli[?[_], A, ?]] {
type TC[M[_]] = Trivial

def liftT[M[_], B](ma: M[B])(implicit ev: Trivial): Kleisli[M, A, B] = Kleisli[M, A, B](a => ma)
def liftT[M[_], B](ma: M[B])(implicit ev: Trivial): Kleisli[M, A, B] = Kleisli.lift(ma)
}

implicit def catsDataApplicativeErrorForKleisli[F[_], A, E](implicit AE: ApplicativeError[F, E]): ApplicativeError[Kleisli[F, A, ?], E]
Expand Down