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Scala example source code file (ContravariantSyntax.scala)

This example Scala source code file (ContravariantSyntax.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.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

contravariant, contravariantsyntax, invariantfunctorsyntax, tocontravariantops, tocontravariantops0, tocontravariantopsunapply, toinvariantfunctorops

The ContravariantSyntax.scala Scala example source code

package scalaz
package syntax

/** Wraps a value `self` and provides methods related to `Contravariant` */
final class ContravariantOps[F[_],A] private[syntax](val self: F[A])(implicit val F: Contravariant[F]) extends Ops[F[A]] {
  ////
  final def contramap[B](f: B => A): F[B] = F.contramap(self)(f)
  final def ∙[B](f: B => A): F[B] = F.contramap(self)(f)
  ////
}

sealed trait ToContravariantOps0 {
  implicit def ToContravariantOpsUnapply[FA](v: FA)(implicit F0: Unapply[Contravariant, FA]) =
    new ContravariantOps[F0.M,F0.A](F0(v))(F0.TC)

}

trait ToContravariantOps extends ToContravariantOps0 with ToInvariantFunctorOps {
  implicit def ToContravariantOps[F[_],A](v: F[A])(implicit F0: Contravariant[F]) =
    new ContravariantOps[F,A](v)

  ////

  ////
}

trait ContravariantSyntax[F[_]] extends InvariantFunctorSyntax[F] {
  implicit def ToContravariantOps[A](v: F[A]): ContravariantOps[F, A] = new ContravariantOps[F,A](v)(ContravariantSyntax.this.F)

  def F: Contravariant[F]
  ////

  ////
}

Other Scala examples (source code examples)

Here is a short list of links related to this Scala ContravariantSyntax.scala source code file:

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