package shapeless
package syntax
import scala.collection.{ GenTraversable, GenTraversableLike }
object sized {
implicit def genTraversableSizedConv[CC[X] <: GenTraversable[X], T](cc : CC[T])
(implicit conv : CC[T] => GenTraversableLike[T, CC[T]]) = new SizedConv[T, CC[T]](cc)
implicit def stringSizedConv(s : String) = new SizedConv[Char, String](s)
}
final class SizedConv[A, Repr <% GenTraversableLike[A, Repr]](r : Repr) {
import ops.nat._
import Sized._
def sized[L <: Nat](implicit toInt : ToInt[L]) =
if(r.size == toInt()) Some(wrap[Repr, L](r)) else None
def sized(l: Nat)(implicit toInt : ToInt[l.N]) =
if(r.size == toInt()) Some(wrap[Repr, l.N](r)) else None
def ensureSized[L <: Nat](implicit toInt : ToInt[L]) = {
assert(r.size == toInt())
wrap[Repr, L](r)
}
}