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
Linear Supertypes
Known Subclasses
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Inherited
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Type Members
- trait ContravariantLaw extends AnyRef
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
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-
final
def
==(arg0: Any): Boolean
- Definition Classes
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-
final
def
asInstanceOf[T0]: T0
- Definition Classes
- Any
-
def
clone(): AnyRef
- Attributes
- protected[java.lang]
- Definition Classes
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- Annotations
- @throws( ... )
- 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]
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- Annotations
- @throws( classOf[java.lang.Throwable] )
-
final
def
getClass(): Class[_]
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-
def
hashCode(): Int
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-
final
def
isInstanceOf[T0]: Boolean
- Definition Classes
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-
final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
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-
final
def
notify(): Unit
- Definition Classes
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-
final
def
notifyAll(): Unit
- Definition Classes
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final
def
synchronized[T0](arg0: ⇒ T0): T0
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def
toString(): String
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final
def
wait(): Unit
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- @throws( ... )
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final
def
wait(arg0: Long, arg1: Int): Unit
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- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )