trait NaturalTransformation[-F[_], +G[_]] extends AnyRef
A universally quantified function, usually written as F ~> G
,
for symmetry with A => B
.
Can be used to encode first-class functor transformations in the
same way functions encode first-class concrete value morphisms;
for example, sequence
from scalaz.Traverse and cosequence
from scalaz.Distributive give rise to ([a]T[A[a]]) ~>
([a]A[T[a]])
, for varying A
and T
constraints.
- Self Type
- NaturalTransformation[F, G]
- Source
- NaturalTransformation.scala
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