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missingfaktor/gist:1222095

Created September 16, 2011 13:14
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Typesafe equals from Scalaz
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gistfile1.scala
scala> case class Person(ssn: Long, name: String, age: Int)
defined class Person
scala> implicit val e = implicitly[Equal[Long]] contramap ((_ : Person).ssn)
e: scalaz.Equal[Person] = scalaz.Equals$$anon$2@19e8fc5
scala> val p = Person(32323L, "Rahul", 21)
p: Person = Person(32323,Rahul,21)
scala> p === p
res59: Boolean = true
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