[swift-evolution] [Proposal] Foundation Swift Archival & Serialization
iferber at apple.com
Mon Mar 20 14:31:43 CDT 2017
I don’t think there’s much of a difference between adding an
"optional" primitive (which has a default implementation in terms of a
different primitive) and simply having that type adopt `Codable` itself
and not be a primitive. You can still switch on the type dynamically
(and we do), but you don’t need the optional overload for it.
On 19 Mar 2017, at 19:33, Jonathan Hull wrote:
> > On Mar 17, 2017, at 1:23 PM, Brent Royal-Gordon via swift-evolution
> <swift-evolution at swift.org> wrote:
>>> (Also, is there any sense in adding `Date` to this set, since it
>>> needs special treatment in many of our formats?)
>>> We’ve considered adding Date to this list. However, this means
>>> that any format that is a part of this system needs to be able to
>>> make a decision about how to format dates. Many binary formats have
>>> no native representations of dates, so this is not necessarily a
>>> guarantee that all formats can make.
>>> Looking for additional opinions on this one.
>> I think that, if you're taking the view that you want to provide a
>> set of pre-specified primitive methods as a list of things you want
>> encoders to make a policy decision about, Date is a good candidate.
>> But as I said earlier, I'd prefer to radically reduce the set of
>> primitives, not add to it.
>> IIUC, two of your three proposed, Foundation-provided coders need to
>> do something special with dates; perhaps one of the three needs to do
>> something special with different integer sizes and types. Think of
>> that as a message about your problem domain.
> Have you considered having a very small set of true primitives, and a
> larger set of optional primitives. For the optional primitives, a
> default implementation would be provided that converts it to/from one
> of the true primitives (e.g. date <—> string), but it would still
> provide an override point for formats that want to support it more
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the swift-evolution