CODEWITHSUNDEEP
scala
Vishrant
Vishrant

Reputation: 16628

Error: found : AnyVal required: Int, how to do auto type casting in Scala

I am getting following error message:

[error]  found   : AnyVal
[error]  required: Int

But Int extends AnyVal [1] so I believe as in Java, Integer can be casted from Object why it's not working in Scala, what I am missing:

[1] final abstract class Int private extends AnyVal

I also tried with a simple example:

val a: AnyVal = 5

def aTob(a: Int): Int = a * 5

aTob(a)

Error:(5, 73) type mismatch;

found : AnyVal

required: Int

But following works:

val a: Any = 5

def aTob(a: Int): Int = a * 5

aTob(a.asInstanceOf[Int])

I don't want to explicitly cast it, but it should be implicit casting.

[Edit:] I also tried with Any

-

Update: 

def getValue(dType: String): Any = {

    dType.toLowerCase() match {

        case "double[3]" =>
            10d
        case "float" =>
            1f

}

val d = getValue("double[3]")
val f = getValue("float")

SomeClass(d, f)


case class SomeClass(val d : Double, val f: Float)

Upvotes: 0

Views: 1152

Answers (1)

Duelist
Duelist

Reputation: 1572

You can use implicit conversion, but it is prone to error because you if you pass e.g. Float like val a: AnyVal = 5.0F you will get ClassCastException:

implicit def anyValToInt(anyVal: AnyVal): Int = anyVal.asInstanceOf[Int]

val a: AnyVal = 5

def aTob(a: Int): Int = a * 5

aTob(a)

Upvotes: 1

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