caseClassCompanion.scala

scala> case class Foo(i:Int)
defined class Foo

scala> Foo.isInstanceOf[Int => Foo]
res4: Boolean = true

scala> Seq(1,2,3).map(Foo)
res5: Seq[Foo] = List(Foo(1), Foo(2), Foo(3))

scala> def foo(f: Int => Foo)(i:Int) = f(i)
foo: (f: Int => Foo)(i: Int)Foo

scala> foo(Foo)(1)
res9: Foo = Foo(1)