Packages

trait Contravariant[F[_]] extends InvariantFunctor[F]

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

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  2. InvariantFunctor
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Type Members

  1. trait ContravariantLaw extends InvariantFunctorLaw
  2. trait InvariantFunctorLaw extends AnyRef
    Definition Classes
    InvariantFunctor

Abstract Value Members

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

    Transform A.

    Transform A.

    Note

    contramap(r)(identity) = r

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  6. def compose[G[_]](implicit G0: Contravariant[G]): Functor[[α]F[G[α]]]

    The composition of Contravariant F and G, [x]F[G[x]], is covariant.

  7. def contravariantLaw: ContravariantLaw
  8. val contravariantSyntax: ContravariantSyntax[F]
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  12. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  14. def icompose[G[_]](implicit G0: Functor[G]): Contravariant[[α]F[G[α]]]

    The composition of Contravariant F and Functor G, [x]F[G[x]], is contravariant.

  15. def invariantFunctorLaw: InvariantFunctorLaw
    Definition Classes
    InvariantFunctor
  16. val invariantFunctorSyntax: InvariantFunctorSyntax[F]
    Definition Classes
    InvariantFunctor
  17. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  18. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  19. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  20. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  21. def product[G[_]](implicit G0: Contravariant[G]): Contravariant[[α](F[α], G[α])]

    The product of Contravariant F and G, [x](F[x], G[x]]), is contravariant.

  22. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  23. def toString(): String
    Definition Classes
    AnyRef → Any
  24. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  27. def xmap[A, B](fa: F[A], f: (A) ⇒ B, g: (B) ⇒ A): F[B]

    Converts ma to a value of type F[B] using the provided functions f and g.

    Converts ma to a value of type F[B] using the provided functions f and g.

    Definition Classes
    ContravariantInvariantFunctor
  28. def xmapb[A, B](ma: F[A])(b: Bijection[A, B]): F[B]

    Converts ma to a value of type F[B] using the provided bijection.

    Converts ma to a value of type F[B] using the provided bijection.

    Definition Classes
    InvariantFunctor
  29. def xmapi[A, B](ma: F[A])(iso: Isomorphism.<=>[A, B]): F[B]

    Converts ma to a value of type F[B] using the provided isomorphism.

    Converts ma to a value of type F[B] using the provided isomorphism.

    Definition Classes
    InvariantFunctor

Inherited from InvariantFunctor[F]

Inherited from AnyRef

Inherited from Any

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