varargs參數作爲類型參數？

Question

有什麼辦法來創建一個類似於這樣：

class F[A] {def apply(a: A) = println(a)} 

，這樣我可以：

(new F[Int*])(1,2,3) 

UPDATE：但除此之外，我想F到接受正常的參數：

(new F[Int])(1) 

Answer 1

scala> class F[A] { def apply(a: A*) = a.length } 
defined class F  

scala> val instance = new F[Int] 
instance: F[Int] = F@11a6631 

scala> instance(1,2,3,4,5) 
res4: Int = 5