Thanks, I'll give that a try.
> On Jun 25, 2017, at 23:11 , Charles Srstka <cocoa...@charlessoft.com> wrote:
>
>> On Jun 26, 2017, at 12:00 AM, Roderick Mann via swift-users
>> <swift-users@swift.org> wrote:
>>
>> I mean, it's as straightforward as my example. I have a Data of arbitrary
>> size (anywhere from 3 to 29 bytes, let's say). The last two bytes form a
>> UInt16 CRC. I need to get those last two out and compare them against the
>> CRC I compute for the rest of the bytes.
>>
>> Having said that, I just used withUnsafeBytes() and grabbed the last two
>> bytes, and assembled them into a UInt16 with shift and or.
>>
>> I'd like to be able to do something like value<Double>(at: 3), though.
>
> You kinda can, although it’s a bit more verbose:
>
> let crc = myData[(myData.endIndex - 2)…].withUnsafeBytes {
> UInt16(littleEndian: $0.pointee) }
>
> If you look at the source, withUnsafeBytes calls withMemoryRebound with the
> inferred generic type (UInt16 in this case), so I think this should be safe.
>
> Charles
>
--
Rick Mann
rm...@latencyzero.com
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
