[swift-evolution] Int indexing into UTF16View
svabox at gmail.com
Thu Jun 8 16:15:43 CDT 2017
On 08.06.2017 20:32, David Hart via swift-evolution wrote:
> When working with Strings which are known to be ASCII, I tend to use the UTF16View for the performance of random access.
About the performance. Do we have a guarantee that 'barcode' declared in code and/or
containing only ASCII chars internally stored as UTF16 ? Otherwise, as I understand,
you'll have a performance penalty calling utf16 when internal storage is in UTF8 for
I would also like to have the convenience of indexing with Int:
> let barcode = "M1XXXXXXXXX/CLEMENT EELT9QBQGVAAMSEZY1353 244 21D 531 10A1311446838”
> let name = barcode.utf16[2..<22]
> let pnrCode = barcode.utf16[23..<30]
> let seatNo = barcode.utf16[47..<51]
> let fromCity = barcode.utf16[30..<33]
> let toCity = barcode.utf16[33..<36]
> let carrier = barcode.utf16[36..<39]
> let flightNumber = barcode.utf16[39..<44]
> let day = barcode.utf16[44..<47]
> I define my own subscript in an extension to UTF16View but I think this should go in the Standard Library.
> Any thoughts?
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