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
- Alphabetic
- By Inheritance
- Contravariant
- InvariantFunctor
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- Any
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Type Members
- trait ContravariantLaw extends InvariantFunctorLaw
-
trait
InvariantFunctorLaw
extends AnyRef
- Definition Classes
- InvariantFunctor
Abstract Value Members
-
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
-
final
def
!=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
- Definition Classes
- AnyRef → Any
-
final
def
==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
final
def
asInstanceOf[T0]: T0
- Definition Classes
- Any
-
def
clone(): AnyRef
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
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. - def contravariantLaw: ContravariantLaw
- val contravariantSyntax: ContravariantSyntax[F]
-
final
def
eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
def
equals(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
finalize(): Unit
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
-
final
def
getClass(): Class[_]
- Definition Classes
- AnyRef → Any
-
def
hashCode(): Int
- Definition Classes
- AnyRef → Any
-
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. -
def
invariantFunctorLaw: InvariantFunctorLaw
- Definition Classes
- InvariantFunctor
-
val
invariantFunctorSyntax: InvariantFunctorSyntax[F]
- Definition Classes
- InvariantFunctor
-
final
def
isInstanceOf[T0]: Boolean
- Definition Classes
- Any
-
final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
final
def
notify(): Unit
- Definition Classes
- AnyRef
-
final
def
notifyAll(): Unit
- Definition Classes
- AnyRef
-
def
product[G[_]](implicit G0: Contravariant[G]): Contravariant[[α](F[α], G[α])]
The product of Contravariant
F
andG
,[x](F[x], G[x]])
, is contravariant. -
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
toString(): String
- Definition Classes
- AnyRef → Any
-
final
def
wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
def
xmap[A, B](fa: F[A], f: (A) ⇒ B, g: (B) ⇒ A): F[B]
Converts
ma
to a value of typeF[B]
using the provided functionsf
andg
.Converts
ma
to a value of typeF[B]
using the provided functionsf
andg
.- Definition Classes
- Contravariant → InvariantFunctor
-
def
xmapb[A, B](ma: F[A])(b: Bijection[A, B]): F[B]
Converts
ma
to a value of typeF[B]
using the provided bijection.Converts
ma
to a value of typeF[B]
using the provided bijection.- Definition Classes
- InvariantFunctor
-
def
xmapi[A, B](ma: F[A])(iso: Isomorphism.<=>[A, B]): F[B]
Converts
ma
to a value of typeF[B]
using the provided isomorphism.Converts
ma
to a value of typeF[B]
using the provided isomorphism.- Definition Classes
- InvariantFunctor