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transform a MemberIn
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object Test { | |
import cats._ | |
import cats.data._ | |
import cats.implicits._ | |
import org.atnos.eff._ | |
import org.atnos.eff.all._ | |
import org.atnos.eff.syntax.all._ | |
case class Address() | |
case class Person(address: Address) | |
object Main extends App { | |
type per[E] = State[Person, ?] |= E | |
type add[E] = State[Address, ?] |= E | |
type err[E] = Xor[String, ?] |= E | |
implicit def AddressPersonNaturalTransformation: (State[Address, ?] ~> State[Person, ?]) = | |
new (State[Address, ?] ~> State[Person, ?]) { | |
def apply[X](s: State[Address, X]) = | |
State[Person, X] { person => | |
val (address, x) = s.run(person.address).value | |
(person.copy(address = address), x) | |
} | |
} | |
def updatePerson[E: per: err]: Eff[E, Unit] = for { | |
_ <- updateAddress[E](implicitly[per[E]].transform, implicitly[err[E]]) | |
} yield () | |
def updateAddress[E: add: err]: Eff[E, Unit] = for { | |
_ <- get | |
} yield () | |
} | |
} |
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