[swift-evolution] Throwing Subscripts (was: Generic Subscripts)

[Dave Abrahams]

Just a request that posters update the subject line when the topic of
discussion changes.

Thanks,
Dave

on Wed Jan 11 2017, Erica Sadun <swift-evolution at swift.org> wrote:

>> On Jan 11, 2017, at 12:26 AM, Chris Lattner via swift-evolution
>> <swift-evolution at swift.org> wrote:
>> 
>> On Jan 10, 2017, at 11:40 AM, Douglas Gregor via swift-evolution
>> <swift-evolution at swift.org
>
>> <mailto:swift-evolution at swift.org>>
>> wrote:
>>>> On Jan 10, 2017, at 10:34 AM, Michael Ilseman via swift-evolution
>>>> <swift-evolution at swift.org
>>>> <mailto:swift-evolution at swift.org>>
>>>> wrote:
>>>> 
>>>> [Forgot to CC swift-evolution the first time]
>>>> 
>>>> When this came up last, it was seen as more so a bug in the
>>>> current implementation, rather than an explicit choice. There's no
>>>> need for a proposal, just a JIRA:
>>>> https://bugs.swift.org/browse/SR-115?jql=text%20~%20%22Generic%20subscript%22
>>>> <https://bugs.swift.org/browse/SR-115?jql=text%20~%20%22Generic%20subscript%22>
>>> 
>>> It’s a nontrivial new user-facing feature with new syntax in the
>>> language, so it’ll need a proposal. ‘twould be good for the
>>> proposal to link to the JIRA ticket.
>>> 
>>> I’ve only heard positive reactions toward this feature, and it’s
>>> something that the standard library could make good use of.
>> 
>> +1, this would be clearly great to happen.
>> 
>> -Chris
>
> I apologize for adding to this topic rather than starting a new one,
> but I figure people interested in subscripts would be more likely to
> see my question:
>
> Is there a good reason subscripts cannot throw? Right now you can
> create a [safe: index] subscript to return an optional but you can't
> create one that returns an unwrapped value or throws.
>
> Thanks, -- E
>
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-- 
-Dave