On Dec 29, 2015, at 8:02 PM, Trent Nadeau via swift-evolution
<[email protected]> wrote:
> Doing this manually is possible using `defer` statements among other options,
> but this is error prone as a `defer` can be forgotten, `lock`/`unlock` calls
> for two locks can be switched due to a typo, etc. Having a dedicated language
> construct for this common case makes it easier to read and write while making
> code shorter and clearer.
>
> ```swift
> do {
> lock.enterScope()
> defer { lock.exitScope() }
>
> let file = try getFileHandle()
> file.enterScope()
> defer { file.exitScope() }
>
> // statements
> }
We have another pattern that types can use, which is:
lock.withThisLockHeld {
… stuff ...
}
This can be done today with trailing closures. Other examples of this are
“autoreleasepool” and withUnsafePointer (for other reasons).
-Chris
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