sealed abstract class ContravariantCoyoneda[F[_], A] extends AnyRef
Decomposition of fi.contramap(k) into its components, as it is
frequently convenient to apply k separately from sorting or
whatever process with fi, even when B is unknown, which is
very common.
This is isomorphic to F as long as F itself is a contravariant
functor. The homomorphism from F[A] to
ContravariantCoyoneda[F,A] exists even when F is not a
contravariant functor.
See ContravariantCoyonedaUsage.scala in the scalaz source tree
for an interesting usage demonstration.
As ContravariantCoyoneda(o)(identity).unlift = o, further
factoring can occur as follows, for free:
ContravariantCoyoneda(o contramap g)(f).unlift = ContravariantCoyoneda(o)(g compose f).unlift
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- ContravariantCoyoneda.scala
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- abstract type I
The pivot between
fiandk, usually existential.
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- final def !=(arg0: Any): Boolean
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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- final def contramap[B](f: (B) => A): Aux[F, B, I]
Simple function composition.
Simple function composition. Allows map fusion without touching the underlying
F. - final def eq(arg0: AnyRef): Boolean
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- final def run(implicit F: Contravariant[F]): F[A]
Converts to
F[A]given thatFis a contravariant. - final def synchronized[T0](arg0: => T0): T0
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- final def trans[G[_]](f: ~>[F, G]): Aux[G, A, I]
Natural transformation.
- final def unlift(implicit F: Contravariant[F]): F[A]
Alias for
run.Alias for
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