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debasishg/gist:761970

Created January 1, 2011 20:12
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Lens can be generated from case classes through compiler plugins ..
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gistfile1.scala
scala> import scalaz._
import scalaz._
scala> import Scalaz._
import Scalaz._
scala> case class Address(no: Int, street: String, zip: String)
defined class Address
// this can be generated
scala> val streetLens: Lens[Address, String] = Lens((a: Address) => a.street, (a: Address, s: String) => a.copy(street = s))
streetLens: scalaz.Lens[Address,String] = Lens(<function1>,<function2>)
// similarly for other fields
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