> On Apr 19, 2017, at 12:10 PM, Paweł Wojtkowiak via swift-evolution
> <[email protected]> wrote:
>
> Maybe writing s[s.startIndex..<i] isn't the worst thing, but writing
> classA.structB.stringC[classA.structB.stringC.startIndex..<i] is not
> beautiful or easy to read at all, and sometimes it can get really complex. Of
> course, you can assign these to variables first and then use them
You don't even really have *that* option for mutating operations. There, you'd
need to do something like:
func withMutable<T, Result>(_ value: inout T, do body: (inout T) throws
-> Result) rethrows -> Result {
return try body(&value)
}
withMutable(&classA.structB.stringC) { c in
c[c.startIndex..<i] = …
}
--
Brent Royal-Gordon
Architechies
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