> On Jan 7, 2017, at 12:40 PM, D. Felipe Torres via swift-evolution
> <[email protected]> wrote:
>
> Any cancelable defer addition we could come up with will need a flag/state to
> indicate so, which won't be that much different from what you wrote.
>
> Having said that, for your example may I suggest this approach instead:
>
> func openFile(kind: String) -> UnsafeMutablePointer<FILE>? {
>
> var file = fopen("MyFile.txt", "r")
> guard fileIsValid(file)
> && fileContainsData(file, kind)
> && !fileDataOutOfDate(file) else {
> fclose(file)
> }
>
> return file
> }
Or:
func openFile(kind: String) -> UnsafeMutablePointer<FILE>? {
var file = fopen("MyFile.txt", "r”)
do {
if fileIsNotValid(file) { throw MyError.fileIsNotValid }
if fileDoesNotContainsData(file, kind) { throw
MyError.doesNotContainData }
if fileDataOutOfDate(file) { throw MyError.dataOutOfDate }
return file
} catch {
fclose(file)
}
}
Charles
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