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Scala example source code file (MonadTell.scala)

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

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The MonadTell.scala Scala example source code

package scalaz

/** The class of monads supporting write operations
trait MonadTell[F[_], S] extends Monad[F] { self =>
  def writer[A](w: S, v: A): F[A]

  def tell(w: S): F[Unit] = writer(w, ())

  val monadTellSyntax = new scalaz.syntax.MonadTellSyntax[F, S] { def F = MonadTell.this }

object MonadTell {
  @inline def apply[F[_], S](implicit F: MonadTell[F, S]): MonadTell[F, S] = F



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