[swift-evolution] Proposal: Change of syntax for class protocols

[Matthew Cheok]

I would expect this to be somewhat common for building weakly referenced
delegates without @objc. Shouldn't this be more common in practice?

On Mon, Dec 7, 2015 at 8:51 AM, Stephen Celis <stephen.celis at gmail.com>
wrote:

> Do others find themselves implementing class-only protocols often? They
> seem to be the exception, rather than the rule, to me.
>
> Stephen
>
> On Mon, Dec 7, 2015 at 11:32 AM, Sean Heber via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> I found this odd, too. I don’t know what kind of parsing ramifications
>> this might have, but I like the idea. I suppose one downside is that it
>> makes protocols for classes seem somehow special or different from other
>> protocols - but then again, they kind of are!
>>
>> l8r
>> Sean
>>
>>
>> > On Dec 7, 2015, at 10:00 AM, Matthew Cheok via swift-evolution <
>> swift-evolution at swift.org> wrote:
>> >
>> > Currently, we declare class protocols with the following syntax:
>> >
>> > protocol TestProtocol: class, OtherProtocol {}
>> >
>> > This is odd for a few reasons:
>> > 1) The keyword class exists in the middle of the declaration
>> > 2) The keyword class follows the colon and looks a lot like inheritance
>> > 3) The keyword class occupies a somewhat arbitrary first position after
>> the colon (otherwise we have an error)
>> >
>> > We also have another use of the class keyword as a modifier when
>> declaring class methods:
>> >
>> > class func doSomething() {}
>> >
>> > I’m suggesting a change of syntax that rectifies the above issues:
>> >
>> > class protocol TestProtocol: OtherProtocol {}
>> >
>> > Would love to hear other thoughts on this.
>> >
>> > - Matthew
>> >
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