| io.reactivex.CompletableSource | 
   Known Indirect Subclasses
  
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Represents a basic Completable source base interface,
 consumable via an CompletableObserver.
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| abstract void | 
        subscribe(CompletableObserver cs)
        
         Subscribes the given CompletableObserver to this CompletableSource instance. 
  
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Subscribes the given CompletableObserver to this CompletableSource instance.
| cs | the CompletableObserver, not null | 
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| NullPointerException | if cs is null
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