From <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.concurrent/-atomic-reference/value....

# kotlin-native

[Sam Schilling]

From https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.concurrent/-atomic-reference/value.html

The referenced value. Gets the value or sets the new value. If new value is not null, it must be frozen or permanent object.

What is a permanent object? I have not seen that language used elsewhere before

[Kris Wong]

I suspect it's an object declared with the object keyword, but not certain

[Sam Schilling]

Ah, that would make sense

[Sam Schilling]

May also refer to literal values?

val a = false

AtomicReference(a) // throws InvalidMutabilityException

AtomicReference(false) // does not throw exception

[Sam Schilling]

Regardless it would be nice to get some clarification from JB on this.

[olonho]

Permanent object is compile-time instantiated object, String literals, some boxed integers and few other objects, such as stateless singletons fall into this category.