abstract class InjectK[F[_], G[_]] extends AnyRef

InjectK is a type class providing an injection from type constructor F into type constructor G. An injection is a functor transformation inj which does not destroy any information: for every ga: G[A] there is at most one fa: F[A] such that inj(fa) = ga.

Because of this all injections admit partial inverses prj which pair a value ga: G[A] back with a single value fa: F[A].

The behavior of the default instances for the InjectK type class are described thoroughly in "Data types a la carte" (Swierstra 2008).

Note

Prior to cats 1.0, InjectK was known as Inject.

See also

http://www.staff.science.uu.nl/~swier004/publications/2008-jfp.pdf

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Instance Constructors

  1. new InjectK()

Abstract Value Members

  1. abstract def inj: FunctionK[F, G]
  2. abstract def prj: FunctionK[G, [α]Option[F[α]]]

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 apply[A](fa: F[A]): G[A]
  5. final def asInstanceOf[T0]: T0
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  6. def clone(): AnyRef
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  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
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  10. final def getClass(): Class[_]
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  11. def hashCode(): Int
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  12. final def isInstanceOf[T0]: Boolean
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  13. final def ne(arg0: AnyRef): Boolean
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  14. final def notify(): Unit
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  15. final def notifyAll(): Unit
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  16. final def synchronized[T0](arg0: ⇒ T0): T0
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  17. def toString(): String
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  18. final def unapply[A](ga: G[A]): Option[F[A]]
  19. final def wait(): Unit
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  20. final def wait(arg0: Long, arg1: Int): Unit
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  21. final def wait(arg0: Long): Unit
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