Re: Seeing nil passed to isEqual:, despite non-null declaration
Re: Seeing nil passed to isEqual:, despite non-null declaration
- Subject: Re: Seeing nil passed to isEqual:, despite non-null declaration
- From: João Varela <email@hidden>
- Date: Fri, 13 Jan 2017 19:42:39 +0000
Hi Sean
Yes, I was bitten by that too, very, very recently, when I was translating a few files into Swift and I got warning when I didn’t use an optional for the object of the method.
Actually, I suspect that’s a bug in the headers, or probably that’s a non-audited header for nullability.
Although isEqual: is part of the NSObject protocol and isEqualTo: is part of the NSComparisonMethods protocol of NSObject, the latter expects a nullable receiver (check that in NSScriptWhoseTests.h). Check the Swift version of it and you will see that isEqual(to: Any?) expects an optional. Therefore, I suspect that the same is true for isEqual: and that this API has not yet been audited for nullability.
Perhaps you should file a bug against that header.
João
>
>
> NSObject.h declares:
>
> - (BOOL)isEqual:(id)object;
>
> Note the parameter is not nullable. And yet, I'm seeing nil passed to one of my class's overrides of isEqual: when I invoke Edit>Undo. Backtrace:
>
> #4 -[RRLookupTable isEqual:]
> #5 -[NSManagedObject(_NSInternalMethods) _updateFromUndoSnapshot:] ()
> #6 -[NSManagedObjectContext(_NSInternalChangeProcessing) _undoInsertions:] ()
> #7 -[_NSUndoStack popAndInvoke] ()
> #8 -[NSUndoManager undoNestedGroup] ()
> #9 _os_activity_initiate ()
> #10 -[NSApplication(NSResponder) sendAction:to:from:] ()
> #11 -[NSMenuItem _corePerformAction] ()
> #12 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] ()
> #13 _os_activity_initiate ()
> #14 -[NSMenu performKeyEquivalent:] ()
> #15 routeKeyEquivalent ()
> #16 -[NSApplication(NSEvent) sendEvent:] ()
> #17 -[NSApplication run] ()
> #18 NSApplicationMain ()
> #19 main
>
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