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Scala example source code file (MonadIO.scala)

This example Scala source code file (MonadIO.scala) is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Scala by Example" TM.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

flo, fromliftio, liftio, monadio, semigroup

The MonadIO.scala Scala example source code

package scalaz
package effect

trait MonadIO[F[_]] extends LiftIO[F] with Monad[F] { self =>

  // derived functions

  val monadIOSyntax = new scalaz.syntax.effect.MonadIOSyntax[F] { def F = MonadIO.this }

object MonadIO {
  @inline def apply[F[_]](implicit F: MonadIO[F]): MonadIO[F] = F


  // TODO for some reason, putting this in RegionTInstances causes scalac to blow the stack
  implicit def regionTMonadIO[S, M[_]](implicit M0: MonadIO[M]) =
    new MonadIO[RegionT[S, M, ?]] with RegionTLiftIO[S, M] with RegionTMonad[S, M] {
      implicit def M = M0
      implicit def L = M0

  private[scalaz] trait FromLiftIO[F[_]] extends MonadIO[F] {
    def FM: Monad[F]
    def FLO: LiftIO[F]
    def point[A](a: => A) = FM.point(a)
    def bind[A, B](fa: F[A])(f: A => F[B]) = FM.bind(fa)(f)
    def liftIO[A](ioa: IO[A]) = FLO.liftIO(ioa)

  private[scalaz] def fromLiftIO[F[_]: LiftIO: Monad]: MonadIO[F] = new FromLiftIO[F] {
    def FM = Monad[F]
    def FLO = LiftIO[F]

  implicit def idTMonadIO[F[_]: MonadIO] = fromLiftIO[IdT[F, ?]]

  implicit def listTMonadIO[F[_]: MonadIO] = fromLiftIO[ListT[F, ?]]

  implicit def optionTMonadIO[F[_]: MonadIO] = fromLiftIO[OptionT[F, ?]]

  implicit def eitherTMonadIO[F[_]: MonadIO, E] = fromLiftIO[EitherT[F, E, ?]]

  implicit def theseTMonadIO[F[_]: MonadIO, E: Semigroup] = fromLiftIO[TheseT[F, E, ?]]

  implicit def streamTMonadIO[F[_]: MonadIO: Applicative] = fromLiftIO[StreamT[F, ?]]

  implicit def kleisliMonadIO[F[_]: MonadIO, E] = fromLiftIO[Kleisli[F, E, ?]]

  implicit def writerTMonadIO[F[_]: MonadIO, W: Monoid] = fromLiftIO[WriterT[F, W, ?]]

  implicit def stateTMonadIO[F[_]: MonadIO, S] = fromLiftIO[StateT[F, S, ?]]


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