I think you can achieve what you want by having the ‘defer’ block capture a
mutable local variable. Eg,
func doStuff() {
var success = false
defer {
if !success {
// do some additional cleanup
}
}
…
success = true
…
return result
}
> On Oct 8, 2017, at 7:34 PM, Jun Zhang via swift-users <swift-users@swift.org>
> wrote:
>
> Hi dear swift developers,
> I am kind of new to swift and I don't know if this feature already exists.
> And if it exists already please tell me how. Thank you very much!
> The feature is to capturing the return value (maybe input value also) of
> the function. Here is the demo code:
>
> func tableView(_ tableView: UITableView, numberOfRowsInSection section:
> Int) -> Int {
> defer {
> if $> >= 0 {
> // table is not empty
> }
> else {
> // table is empty
> }
> }
> return dataSource.cout
> }
>
> I suggest using `$>` as the return value symbol and `$<` as the input
> parameter symbol.
> Thank you all and best regards to you!
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> swift-users@swift.org
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