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Extensions for java.lang.ThreadLocal

Platform and version requirements: JVM (1.0)

getOrSet

Gets the value in the current thread's copy of this thread-local variable or replaces the value with the result of calling default function in case if that value was null.

fun <T : Any> ThreadLocal<T>.getOrSet(default: () -> T): T

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.concurrent/java.lang.-thread-local/index.html