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Singleton instance is "initialized" by delegating constructor call, which is superclass constructor call in case of singletons (because singletons can't have more than one constructor). Singleton constructor is effectively split into two stages: - before a super constructor call; - after a super constructor call. Before super constructor call, singleton instance can't be used directly (see KT-20662), because neither 'this' nor static instance is initialized yet. However, it can be used in closures, in which case a static instance should be used (escaping uninitialized this is prohibited by JVM). Actually using this static instance before it is initialized (e.g., invoking a method that uses this singleton) will cause a correct ExceptionInInitializerError. After a super constructor call, static instance of a singleton may be not initialized yet (in case of enum entries and interface companion objects). However, we already have an initialized 'this', which we should use for singleton references. #KT-20651 Fixed
7 lines
123 B
Kotlin
Vendored
7 lines
123 B
Kotlin
Vendored
abstract class Base(val fn: () -> String)
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object Test : Base({ Test.ok() }) {
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fun ok() = "OK"
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}
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fun box() = Test.fn() |