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Inner class constructors should use the argument instead of reading outer `this` from a field because if such an access happens before a delegating constructor call, e.g. when evaluating an argument, a JVM bytecode validation error will be thrown. (The only operation on `this` allowed before a delegating constructor call is SETFIELD, and only if the field in question is declared in the same class.)
22 lines
446 B
Kotlin
Vendored
22 lines
446 B
Kotlin
Vendored
interface Callback {
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fun invoke(): String
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}
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open class Base(val callback: Callback)
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class Outer {
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val ok = "OK"
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inner class Inner : Base(
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object : Callback {
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override fun invoke() =
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(object : Callback {
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override fun invoke() = ok
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}).invoke()
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}
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)
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}
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fun box(): String =
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Outer().Inner().callback.invoke()
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