for jvm
libraryDependencies += "com.github.xuwei-k" %% "scalaz-magnolia" % "0.6.0"
for scala-js
libraryDependencies += "com.github.xuwei-k" %%% "scalaz-magnolia" % "0.6.0"
auto deriving scalaz typeclass instances with magnolia
License: MIT License
to save you from writing one...
import magnolia._
import org.scalacheck._
import scalaz._, Scalaz._
import scalaz.scalacheck.ScalaCheckBinding._
object ScalacheckMagnolia {
type Typeclass[A] = Arbitrary[A]
def combine[A](ctx: CaseClass[Arbitrary, A]): Arbitrary[A] = Arbitrary {
ctx.parameters.toList.traverse(p => Gen.lzy(p.typeclass.arbitrary)).map { ps =>
ctx.rawConstruct(ps)
}
}
def dispatch[A](ctx: SealedTrait[Arbitrary, A]): Arbitrary[A] = Arbitrary {
Gen.frequency(ctx.subtypes.map(s => 1 -> (Gen.lzy(s.typeclass.arbitrary))): _*)
}
implicit def gen[A]: Arbitrary[A] = macro Magnolia.gen[A]
}
softwaremill/magnolia#118 (comment)
And there is also one for scalaz-deriving
.
FYI https://gitlab.com/fommil/scalaz-deriving includes
and examples
There are some things that I don't think work very well in scalaz-deriving, magnolia is better for them. Typically things that are not lawful (e.g. require access to labels)
Show
Arbitrary
These magnolia instances would work with @deriving
if they come with an appropriate deriving.conf
file.
However, I think lawful things like Equal
, Order
, Semigroup
, Monoid
are best done with lawful typeclasses such as Decidablez
, Altz
.
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