Usage of ClassManifest

Magic.scala

def matchType[A:ClassManifest](value: Any): Boolean = {
  val classAny: Class[_] = value match {
    case _:Byte=> classOf[Byte]
    case _:Short => classOf[Short]
    case _:Int => classOf[Int]
    case _:Long => classOf[Long]
    case _:Float => classOf[Float]
    case _:Double => classOf[Double]
    case _:Char => classOf[Char]
    case _:Boolean => classOf[Boolean]
    case _:Unit => classOf[Unit]
    case _ => value.asInstanceOf[AnyRef].getClass
  }
  val classA = implicitly[ClassManifest[A]].erasure.asInstanceOf[Class[A]]
  classAny.isAssignableFrom(classA)
}
def f[T:ClassManifest](h:Seq[Any]) = h.flatMap{ 
  case a if matchType[T](a) =>Some(a); case _=>None 
}
println(f[String](List(1, 2, 3)))
println(f[Int](List(1, 2, 3)))