Double variable argument list

Question

I need something like this:

class Node (left : Node*, right : Node*)

I understand the ambiguity of this signature.

Is there a way around it better than the following?

class Node (left : Array[Node, right : Array[Node])
val n = new Node (Array(n1, n2), Array(n3))

Maybe some kind of separator like this?

val n = new Node (n1, n2, Sep, n3)

Randall Schulz · Accepted Answer · 2010-05-09 01:00:46Z

8

You can have multiple argument lists, each of which may have (or just be) one repeated-args parameter:

scala> def m1(ints: Int*)(strs: String*): Int = ints.length + strs.length
dm1: (ints: Int*)(strs: String*)Int

scala> m1(1, 2, 3)("one", "two", "three")
res0: Int = 6

I ran this in the Scala 2.8 REPL. I don't know a reason it wouldn't work in 2.7, offhand.

answered May 9, 2010 at 1:00

Randall Schulz

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2 Comments

Randall Schulz Over a year ago

@Łukasz Lew: I was but 9 seconds behind you!

Łukasz Lew Over a year ago

So I will give you the great green tick of answer :)

Łukasz Lew · Accepted Answer · 2010-05-09 01:00:37Z

6

This works:

class Node (left : Node*) (right : Node*)

Scala is great!

answered May 9, 2010 at 1:00

Łukasz Lew

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Comments

Jackson Davis · Accepted Answer · 2010-05-09 00:52:18Z

1

I dont beleive you can have multiple varargs. You maybe could do something like

class Node(left: Node*) {
  def apply(right: Node*) = ...

and then you can create new Node(n1,n2)(n3)

answered May 9, 2010 at 0:52

Jackson Davis

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