[swift-evolution] [Review] SE-0030 Property Behaviors

[Thorsten Seitz]

> Am 19.02.2016 um 19:39 schrieb Joe Groff <jgroff at apple.com>:
> 
>> On Feb 19, 2016, at 7:39 AM, Thorsten Seitz <tseitz42 at icloud.com> wrote:
>> 
>> I'm having trouble wrapping my head around the difference between accessors and methods defined by a property: AFAIU accessors are like abstract methods if required and just like methods if not, whereas methods are like final methods as they cannot be overridden in a property use site.
> 
> Accessors are provided by the var declaration using the behavior. Methods are fixed implementations.

Thanks! So accessors are indeed like abstract methods (if required) and methods are like final methods.

>> If I did understand this correctly then I'd prefer that instead of "accessor" we would just use "func" and introduce a new keyword "abstract". The latter can then be extended to  classes in another proposal.

i.e. instead of a required "accessor" we would use "abstract func" and instead of an "accessor" with a default implementation we would use "func".
Instead of "func" for methods we would use "final func".

Then the only new concept would be "abstract" instead of "accessor" and we could extend it to normal methods which would be welcome.

-Thorsten 


 
>> 
>>> Am 19.02.2016 um 03:56 schrieb Joe Groff via swift-evolution <swift-evolution at swift.org>:
>>> 
>>> Based on review feedback, I've revised the declaration syntax proposal for property behaviors to be more in line with our other declaration forms, reverting to the earlier pre-review "var behavior" proposal. I've updated the proposal in swift-evolution:
>>> 
>>> https://github.com/apple/swift-evolution/blob/master/proposals/0030-property-behavior-decls.md
>>> 
>>> In discussion with the core team, we've also strongly come in favor of applying behaviors to properties using attribute syntax, e.g.:
>>> 
>>> @lazy var x = 111
>>> @delayed var x: Int
>>> 
>>> They're definitely attribute-like, and we think it makes sense for behaviors to be the first of hopefully many kinds of user-defined behaviors. What do you all think of this direction?
>>> 
>>> -Joe
>>> 
>>>> On Feb 10, 2016, at 2:00 PM, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
>>>> 
>>>> Hello Swift community,
>>>> 
>>>> The review of SE-0030 "Property Behaviors" begins now and runs through February, 2016. The proposal is available here:
>>>> 
>>>> https://github.com/apple/swift-evolution/blob/master/proposals/0030-property-behavior-decls.md
>>>> Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at
>>>> 
>>>> https://lists.swift.org/mailman/listinfo/swift-evolution
>>>> or, if you would like to keep your feedback private, directly to the review manager. When replying, please try to keep the proposal link at the top of the message:
>>>> 
>>>> Proposal link:
>>>> 
>>>> https://github.com/apple/swift-evolution/blob/master/proposals/0030-property-behavior-decls.md
>>>> Reply text
>>>> 
>>>> Other replies
>>>> What goes into a review?
>>>> 
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>>>> 
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>>>> 
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>>>> 
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