Created
July 18, 2011 13:09
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Lensed
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// see https://github.com/gseitz/Lensed | |
object Lensed { | |
import scalaz._ | |
import Scalaz._ | |
case class Address(street: String) | |
case class Person(name: String, address: Address) | |
object Person { | |
// currently generated | |
val name: Lens[Person, String] = Lens(_.name, (p, n) => p.copy(name = n)) | |
val address: Lens[Person, Address] = Lens(_.address, (p, a) => p.copy(address = a)) | |
// proposed | |
class PimpedLens[A](l: Lens[A, Person]) { | |
val name: Lens[A, String] = l andThen Person.name | |
val address: Lens[A, Address] = l andThen Person.address | |
} | |
implicit def pimpLens[A](l: Lens[A, Person]) = new PimpedLens(l) | |
} | |
object Address { | |
// Generated | |
val street: Lens[Address, String] = Lens(_.street, (p, s) => p.copy(street = s)) | |
// proposed | |
class PimpedLens[A](l: Lens[A, Address]) { | |
val street: Lens[A, String] = l andThen Address.street | |
} | |
implicit def pimpLens[A](l: Lens[A, Address]) = new PimpedLens(l) | |
} | |
val p = Person("Brent", Address("Main St")) | |
Person.address.street.set(p, "Lower Main St") | |
} |
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