CODEWITHSUNDEEP
kotlin
user2340612
user2340612

Reputation: 10723

Kotlin deprecated companion instance

When creating a private companion object in Kotlin, why is the Companion static variable marked as @Deprecated public in the bytecode? Is that just a workaround to "simulate" a private behaviour discouraging developers from using that field (since a public companion object doesn't get marked as deprecated)?

Example:

Kotlin

class MyClassWithCompanion {
    private companion object {
        private val FOO = "FOO"
    }
}

Bytecode

// DEPRECATED
// access flags 0x20019
public final static LMyClassWithCompanion$Companion; Companion
@Ljava/lang/Deprecated;()

Upvotes: 2

Views: 375

Answers (1)

yole
yole

Reputation: 97268

The @Deprecated annotation is placed as an intermediate solution to avoid breaking binary compatibility when a compiler bug was fixed. The field wasn't supposed to be generated as public when the companion object is private, but due to an oversight it was. In Kotlin 1.4, it will be marked as private.

See this issue for more information.

Upvotes: 3

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