object Once
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- final def !=(arg0: Any): Boolean
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- def apply(fn: => Unit): () => Unit
Returns a function that runs
fn
the first time it's called and then never again.Returns a function that runs
fn
the first time it's called and then never again. If the returned function is invoked while another thread is runningfn
for the first (and only) time, the interloping thread blocks untilfn
has finished.If
fn
throws, it may be run more than once. - final def asInstanceOf[T0]: T0
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