gistfile1.scala

object ShapelessTest extends App {
  import shapeless._
  import record._
  import ops.hlist.ToList
  import ops.record.{ Keys, Values }
  import syntax.singleton._
  
  val ps = List(
    ("name"  ->> "Mel")  ::
    ("age"   ->> 90L)    ::
    ("teeth" ->> 2)      :: HNil,
    
    ("name"  ->> "Jude") ::
    ("age"   ->> 99L)    ::
    ("teeth" ->> 3)      :: HNil,
    
    ("name"  ->> "Bif")  ::
    ("age"   ->> 1L)     ::
    ("teeth" ->> 1)      :: HNil
  )
  
  ps.sortBy(_("age") + 0L)   // wookie
  ps.sortBy(_("teeth") + 0) // wookie
  ps.sortBy(_("age"))       // no wookie
  ps.sortBy(_("teeth"))     // no wookie
//    - not enough arguments for method sortBy: (implicit ord: 
//   scala.math.Ordering[Long with 
//	 shapeless.record.KeyTag[String("age")]])List[shapeless.::[String with 
//	 shapeless.record.KeyTag[String("name")],shapeless.::[Long with 
//	 shapeless.record.KeyTag[String("age")],shapeless.::[Int with 
//	 shapeless.record.KeyTag[String("teeth")],shapeless.HNil]]]]. Unspecified 
//	 value parameter ord.
//	- No implicit Ordering defined for Long with 
//	 shapeless.record.KeyTag[String("age")].
//	- Implicit conversions found: _ => recordOps(_)
}