With an empty body, you mean?
> On 30 Jun 2017, at 22:00, Joe Groff <jgr...@apple.com> wrote:
>
>
>> On Jun 30, 2017, at 11:47 AM, Mike Ferenduros via swift-users
>> <swift-users@swift.org> wrote:
>>
>> I'm doing a RAII sort of thing with an object, and would like to keep it
>> alive until an completion-block is called (asynchronously).
>>
>> Is it sufficient to say '_ = x' in the completion-block to keep a live
>> reference to the object?
>>
>> I was told that the optimiser is free to discard this line, and thus the
>> object could be freed prematurely depending on how the code is compiled. If
>> so, is there an idiomatic way to do this? Or should I just avoid RAII in
>> Swift?
>
> `withExtendedLifetime(x) { ... }` is the supported way of extending the
> lifetime of an object.
>
> -Joe
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