Implicit conversion from A to Some(a)

Question

out of curiosity, I was wondering if it was possible to do something like :

def myMethod(
  a: Option[A] = None,
  b: Option[B] = None, 
  ...
  z: Option[Z] = N         


        

Answer 1

My favorite solution is this:

class Opt[A](val value: Option[A]) extends AnyVal
object Opt {
   implicit def fromA[A](x: A): Opt[A] = new Opt(Some(x))
   implicit def toOption[A](x: Opt[A]): Option[A] = x.value
   def N[A]: Opt[A] = new Opt(None) 
}

def myMethod(
  a: Opt[A] = Opt.N,
  ...
  z: Opt[Z] = Opt.N
): Something = ...

Because Opt is used only for default parameters, the implicit conversions are harmless.