I\'ve got some code like this:
def foo (s: => Any) = println(s)
But when I want to transform this to an argument list with variable leng
You have to use zero-argument functions instead. If you want, you can
implicit def byname_to_noarg[A](a: => A) = () => a
and then
def foo(s: (() => Any)*) = s.foreach(a => println(a()))
scala> foo("fish", Some(7), {println("This still happens first"); true })
This still happens first
fish
Some(7)
true
There is an issue: https://issues.scala-lang.org/browse/SI-5787
For the accepted answer, to recover the desired behavior:
object Test {
import scala.language.implicitConversions
implicit def byname_to_noarg[A](a: => A) = () => a
implicit class CBN[A](block: => A) {
def cbn: A = block
}
//def foo(s: (() => Any)*) = s.foreach(a => println(a()))
def foo(s: (() => Any)*) = println(s(1)())
def goo(a: =>Any, b: =>Any, c: =>Any) = println(b)
def main(args: Array[String]) {
foo("fish", Some(7), {println("This still happens first"); true })
goo("fish", Some(7), {println("This used to happens first"); true })
foo("fish", Some(7), {println("This used to happens first"); true }.cbn)
}
}
Excuse the lolcats grammar.