[swift-evolution] Make non-void functions @warn_unused_result by default

[Janosch Hildebrand]

> On 18 Dec 2015, at 23:23, Dave Abrahams <dabrahams at apple.com> wrote:
>> 
>> I think a second method à la dropFirst/Last/... that returns Void would be better at communicating intent and allows pop() to retain the warning.
> 
> Those are non-mutating methods that don’t return Void, FWIW.  Names to be adjusted accordingly… ;-)

Fair point :-)


>>> On 18 Dec 2015, at 21:48, Erica Sadun via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>> 
>>> I vote +1 in favor of making warn_unused_result the default. It's simple, elegant, logical, functional, and will reduce stdlib clutter.
>>> 
>>> As for replacing it? Although I'd probably be okay with suppress_unused_warning, please consider optional hey_no_worries_mate_on_unused, unused_is_mellow, or dont_harsh_my_unused. Supporting _ = pop() without further warning is icing on the cake, as it enables the behavior to be established at either the API or consuming end.
>>> 
>>> -- E
>>> 
>>>> On Dec 18, 2015, at 1:25 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>> 
>>>>> On Dec 18, 2015, at 3:47 AM, Tino Heth via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>>> 
>>>>>> _ = pop()
>>>>> 
>>>>> Now that's what I'd call ugly - I vote against everything that forces me to use more underscores ;-)
>>>> 
>>>> “pop()” is an example of the comparatively-rare method that one might want to annotate to avoid the warning: the side-effect is useful even if you’re dropping the result.  We’re only talking about making warn_unused_result the default, not making it the only option.
>>>> 
>>>> -Dave
>>>> 
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> -Dave

- Janosch

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