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).
- Source
- InjectK.scala
- 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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