> On Dec 24, 2017, at 1:03 AM, Daryle Walker <dary...@mac.com> wrote: > >> On Dec 22, 2017, at 2:18 PM, Quincey Morris >> <quinceymor...@rivergatesoftware.com >> <mailto:quinceymor...@rivergatesoftware.com>> wrote: >> >> On Dec 22, 2017, at 08:48 , Daryle Walker <dary...@mac.com >> <mailto:dary...@mac.com> <mailto:dary...@mac.com <mailto:dary...@mac.com>>> >> wrote: >>> >>> DispatchData would need to be convertible to Data. Is there a way to do >>> the conversion in Swift? >> >> Actually, on consideration, I think not. It would be if DispatchData was >> bridgeable like Data, but it isn’t, and I don’t see any way of extracting >> its underlying reference. This leaves you with two options that I can see: >> >> 1. Use an Obj-C helper function, taking an array of input buffers, and >> returning a dispatch_data_t object that combines them, cast to a NSData*. >> You can then use the returned reference as Data. >> >> 2. Move your Data extension to DispatchData. That’s what I was asking about >> earlier — is there any reason why you couldn’t just use DispatchData rather >> than Data, in all the code that deals with this data set? In that case, you >> can just build the DispatchData in Swift. >> >> IAC, you should probably submit a bug report. Since dispatch_data_t is >> documented to be a subclass of NSData, there should probably be a mechanism >> for getting Data and DispatchData values as equivalents of each other, >> without any unprovoked copying of the underlying data. > > This code is not for private use within an app, but for something I plan to > publicize as a library on GitHub. So the interface has to stay as using Data. > (Fortunately, this part of the interface, an extension to Data, is private.) > DispatchData and Data don’t even have a custom shared interface (just the > general RandomAccessCollection) I could use here to not repeat myself in > implementation.
Depending on what your library does, you could consider making its interface take generic collections of UInt8. Then, your APIs would accept Data, DispatchData, [UInt8], ContiguousArray<UInt8>, etc. Charles _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
