[swift-users] Foundation on Linux `CFBooleanGetTypeID`/`CFGetTypeID`
anthony.parker at apple.com
Tue May 24 14:52:30 CDT 2016
> On May 24, 2016, at 12:49 PM, Jens Alfke <jens at mooseyard.com> wrote:
>> On May 24, 2016, at 11:03 AM, Tony Parker <anthony.parker at apple.com <mailto:anthony.parker at apple.com>> wrote:
>> Why not use `func boolValue` instead, if you need a true/false answer?
> I don’t remember the original code snippet, but there are cases where you need to know what type of number is stored in an NSNumber. An example is encoding to JSON, where a boolean value should be written as “true” or “false”, not “1” or “0”.
Fair enough, and we do use this trick in NSJSONSerialization(.m).
One other possibility is using the objCType property on NSNumber’s superclass NSValue to check. I haven’t seen how much of this is implemented in corelibs-foundation yet. We did redefine Boolean to _Bool in Swift CF, so we’ll have to see if that accidentally resulted in a runtime difference between platforms here that we didn’t consider.
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the swift-users