CODEWITHSUNDEEP
scalatypestype-conversiontype-parameter
MintyAnt
MintyAnt

Reputation: 3058

Force passing a type parameter

For some reason I have

val stuff: Map[String, Any] = Map[String, Any](
  ("a", 1),
  ("b", "one"),
  ("c", false)
)

def getThing[T](key: String): T = {
  stuff.get(key).get.asInstanceOf[T]
}

val a: Int = getThing("a") // I want this to break on compile
val anotherA: Int = getThing[Int]("a") // I want this to work as normal

I want the get's without specifying the type to break on compile, and the ones that do specify to work.

Upvotes: 2

Views: 139

Answers (1)

Jasper-M
Jasper-M

Reputation: 15086

You can't force a type argument to be provided explicitly. Maybe you can turn it into a normal argument, if you really want this behaviour...

case class Type[T]

def getThing[T](t: Type[T])(key: String): T =
  stuff.get(key).get.asInstanceOf[T]

val a = getThing(Type[Int])("a")

Upvotes: 1

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