[swift-corelibs-dev] Query on NSKeyedArchiver

[Luke Howard]

BTW is anything blocking integrating SR-2416?

https://github.com/apple/swift-corelibs-foundation/pull/574

That allows value types to be archived too if they support _ObjectBridgeable (they’ll come back as reference types though).

> On 27 Oct 2016, at 4:22 AM, Tony Parker via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> 
> 
>> On Oct 26, 2016, at 10:14 AM, Max Desiatov <max.desiatov at gmail.com <mailto:max.desiatov at gmail.com>> wrote:
>> 
>> Hi Tony,
>> 
>> This is very interesting caveat. Is there a plan to get this documented anywhere? I haven't seen any documentation for Swift Foundation published publicly anywhere akin to how it's done for other APIs at https://developer.apple.com/reference/ <https://developer.apple.com/reference/>.
>> 
>> With best regards, Max.
> 
> With respect to the NSObject requirement: It’s really more of a known issue than a permanent limitation.
> 
> To over summarize the situation: NSKeyedArchiver (the Objective-C one) puts a private category on NSObject and assumes all objects respond to those messages after that.
> 
> We don’t really have documentation for swift-corelibs-foundation beyond what we can put in our own headerdoc format there. That would be something I would really appreciate help on if anyone is interested in contributing.
> 
> - Tony
> 
>> 
>>> On 26 Oct 2016, at 18:11, Tony Parker via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>>> 
>>> Hi Sai,
>>> 
>>> We do have basic support for keyed archiving and unarchiving in swift-corelibs-foundation on Linux. The limitation is that the NSCoding protocol cannot be applied to Swift struct types, only class types. On Darwin, the class also must be a subclass of NSObject. This last limitation may not exist on Linux, but you should be aware that if you encode a non-NSObject subclass on Linux then you would not be able to decode it on Darwin.
>>> 
>>> - Tony
>>> 
>>>> On Oct 26, 2016, at 4:07 AM, Sai Kanduri via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>>>> 
>>>> Hi Tony,
>>>>  
>>>> From your comments on Pull Request #574 I understand that we cannot archive/un-archive non-NS objects using  NsKeyedArchiver & NSKeyedUnarchiver.I s my understanding correct ..? Does this means that archiving and un-archiving of  swift types is  not supported on Linux  ?
>>>>  
>>>> -Sai Hema
>>>> 
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Luke Howard
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