Trait/Object

scalaz

Contravariant

Related Docs: object Contravariant | package scalaz

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trait Contravariant[F[_]] extends AnyRef

Contravariant functors. For example, functions provide a scalaz.Functor in their result type, but a scalaz.Contravariant for each argument type.

Note that the dual of a scalaz.Functor is just a scalaz.Functor itself.

Providing an instance of this is a useful alternative to marking a type parameter with - in Scala.

Self Type
Contravariant[F]
Source
Contravariant.scala
See also

scalaz.Contravariant.ContravariantLaw

Linear Supertypes
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Known Subclasses
IsomorphismContravariant
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Type Members

  1. trait ContravariantLaw extends AnyRef

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Abstract Value Members

  1. abstract def contramap[A, B](r: F[A])(f: (B) ⇒ A): F[B]

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    Transform A.

    Transform A.

    Note

    contramap(r)(identity) = r

Concrete Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. final def asInstanceOf[T0]: T0

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  5. def clone(): AnyRef

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    Attributes
    protected[java.lang]
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    @throws( ... )

  6. def contravariantLaw: ContravariantLaw

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  7. val contravariantSyntax: ContravariantSyntax[F]

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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  10. def finalize(): Unit

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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )

  11. final def getClass(): Class[_]

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  12. def hashCode(): Int

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  13. final def isInstanceOf[T0]: Boolean

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  14. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
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  15. final def notify(): Unit

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  16. final def notifyAll(): Unit

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  17. final def synchronized[T0](arg0: ⇒ T0): T0

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  18. def toString(): String

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  19. final def wait(): Unit

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    @throws( ... )

  20. final def wait(arg0: Long, arg1: Int): Unit

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  21. final def wait(arg0: Long): Unit

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