| io.reactivex.CompletableOperator | 
Interface to map/wrap a downstream observer to an upstream observer.
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| abstract CompletableObserver | apply(CompletableObserver observer) Applies a function to the child CompletableObserver and returns a new parent CompletableObserver. | ||||||||||
Applies a function to the child CompletableObserver and returns a new parent CompletableObserver.
| observer | the child CompletableObservable instance | 
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| Exception | on failure | 
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