Construct.scala

import shapeless._
import shapeless.ops.product._
import shapeless.syntax.std.product._

case class Foo(a: Int, b: String)
case class Bar(a: Int, b: String, c: Foo)
case class Empty()
case object Object

trait CaseFromProduct[T] {
  def apply[P <: Product, L <: HList](p: P)
    (implicit genP: Generic.Aux[P, L], genT: Generic.Aux[T, L]): T =
      genT.from(p.toHList)
}

object newFoo    extends CaseFromProduct[Foo]
object newBar    extends CaseFromProduct[Bar]
object newEmpty  extends CaseFromProduct[Empty]
object newObject extends CaseFromProduct[Object.type]

val foo   = newFoo(42, "hello")       // foo: Foo             = Foo(42, hello)
val bar   = newBar(12, "world", foo)  // bar: Bar             = Bar(12, world, Foo(42, hello)
val empty = newEmpty                  // empty: newEmpty.type = ...
val obj   = newObject                 // obj: lObject.type    = ...