On 08.06.2017 20:32, David Hart via swift-evolution wrote:
Hello,
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
example, no?
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?
David.
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