[swift-users] unowned self in closure in a playground

Ray Fix rayfix at gmail.com
Tue Feb 21 21:53:34 CST 2017


> On Feb 21, 2017, at 7:32 PM, rintaro ishizaki <fs.output at gmail.com> wrote:
> 
> lifetime guaranteed to be around until the method call completes
> 
> AFAIK, this is true.
> However, in this case, it's not a method call. The lifetime is only guaranteed until getter:increment completes.
> 
> Demo().increment(3)
> |--------------| lifetime
> 

Thanks!  This is an interesting explanation.  

It is curious that naming the variable cases different behavior.
IOW, this doesn’t have a problem:

let demo = Demo()
demo.increment(3)

Lifetime seems to last the entire expression. 

Ray
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