[swift-corelibs-dev] NSAttributedString attributesAtIndex return an optional.

[Brent Royal-Gordon]

> Been playing around with NSAttributedString and cannot decide on the best way to implement the (attributesAtIndex: effectiveRange) and other methods with similar functionality.
> 
> In the ObjC world I would expect an empty NSDictionary even in cases where the location is greater than the length of the string.

Personally, if I indexed past the end of an attributed string, I would expect a precondition to fail and (since Swift can't catch assertion failures) my app to crash. (And from what I can tell, the Apple Foundation versions of these APIs do not return an optional.)

(Sorry about the duplicate, James—didn’t hit Reply All when I should have.)

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Brent Royal-Gordon
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