Zach, Thanks for the fix!
Ah, I think I now see the difference between a UnsafeBufferPointer (it essentially holds the address an array of data) vs. a UnsafePointer (it holds the address where one piece of data is stored), but I'll still need to read the final documentation when it's done. Dave > On Aug 15, 2016, at 9:15 PM, Zach Waldowski via swift-users > <swift-users@swift.org> wrote: > > Nerd here! > > That part of the code ends up not needing to go through the > UnsafeRawPointer API, as it's processing UTF-8 bytes, see also: > <https://github.com/bignerdranch/Freddy/pull/191>. > > That being said, good resources for reading about the new pointer system > are: > - [SE-0107]: > <https://github.com/apple/swift-evolution/blob/master/proposals/0107-unsaferawpointer.md> > - [The Apple API reference], once it's updated: > <https://developer.apple.com/reference/swift> > > You can also look up the documentation using the "Documentation and API > Reference" menu in Xcode 8 Beta 6, as it's currently updated. > > Sincerely, > Zachary Waldowski > zach...@bignerdranch.com > > On Mon, Aug 15, 2016, at 03:05 PM, Dave Reed via swift-users wrote: >> I'm trying to convert the following code (from the Big Nerd Ranch's >> Freddy JSON parser) that works in Xcode 8 beta 5 and convert it to work >> with beta 6. Essentially it appears it needs to take a Data object and >> convert it to a UnsafeBufferPointer<UInt8> if I understand it correctly. >> >> >> /// Creates a `JSONParser` ready to parse UTF-8 encoded `NSData`. >> /// >> /// If the data is mutable, it is copied before parsing. The data's >> lifetime >> /// is extended for the duration of parsing. >> init(utf8Data inData: Data) { >> let data = (inData as NSData).copy() as! Data >> let buffer = UnsafeBufferPointer(start: >> UnsafePointer<UInt8>((data as NSData).bytes), count: data.count) >> self.init(buffer: buffer, owner: data) >> } >> >> And this case appears to be going from a String to >> UnsafeBufferPointer<Uint8> >> >> >> /// Creates a `JSONParser` from the code units represented by the >> `string`. >> /// >> /// The synthesized string is lifetime-extended for the duration of >> parsing. >> init(string: String) { >> let codePoints = string.nulTerminatedUTF8 >> let buffer = codePoints.withUnsafeBufferPointer { >> nulTerminatedBuffer in >> // don't want to include the nul termination in the buffer - >> trim it off >> UnsafeBufferPointer(start: nulTerminatedBuffer.baseAddress, >> count: nulTerminatedBuffer.count - 1) >> } >> self.init(buffer: buffer, owner: codePoints) >> } >> >> } >> >> >> I understand pointers from my C/C++/Objective-C days but I don't yet >> understand the various Swift pointer types. Any help is appreciated. >> >> Note: I don't work for Big Nerd Ranch. I'm just trying to use the code >> and better understand the various Swift pointer types. >> >> Thanks, >> Dave Reed >> >> >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org >> https://lists.swift.org/mailman/listinfo/swift-users > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users
