Kotlin: cannot use const val from companion object in an outer enum class

Question

I have a Kotlin enum class defined like this:

enum class EnumClass(val string: String) {

    VALUE_A(A), // [1]

    VALUE_B(B); // [2]

    companion object {

        const val A = "A"

        const val B = "B"
    }
}

and the compiler gives me following errors in lines [1] and [2]:

Variable 'A' must be initialized
Variable 'B' must be initialized

I can solve this error by extracting the consts to the top-level of source file but I don't like this solution. Is there any other way around this problem?

strange enough, if you fully qualify the `A`/`B` it works, i.e. `VALUE_A(yourpackage.EnumClass.A)` did not give me any compiler errors... — Roland, Oct 21 '19 at 12:26

score 4 · Accepted Answer · answered Oct 21 '19 at 12:27

4

I was able to get this to work by fully qualifying A and B:

enum class EnumClass(val string: String) {
    VALUE_A(EnumClass.A), 
    VALUE_B(EnumClass.B); 

    companion object {
        const val A = "A"
        const val B = "B"
    }
}

answered Oct 21 '19 at 12:27

Todd

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Thanks, it worked. What's strange is that after adding the qualifier Android Studio marks it as `Redundant qualifier name`... – goshki Oct 21 '19 at 12:59

score 1 · Answer 2 · edited Mar 06 '23 at 12:37

1

This will no longer be allowed in 1.9. See this ticket.

edited Mar 06 '23 at 12:37

Boken

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answered Feb 08 '23 at 12:22

David H

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Kotlin: cannot use const val from companion object in an outer enum class

2 Answers2