[swift-evolution] Add code to super methods.

[Michael Ilseman]

> On Nov 28, 2016, at 7:22 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> on Thu Nov 24 2016, Michael Ilseman <swift-evolution at swift.org> wrote:
> 
>>> On Nov 17, 2016, at 2:54 AM, Tino Heth via swift-evolution
>> <swift-evolution at swift.org> wrote:
>>> 
>>> An equivalent of "NS_REQUIRES_SUPER" (hopefully with a better name ;-) has been requested several
>> times, but never got the momentum it deserves.
>>> Considering the current confusion (especially in UIKit), it would be
>>> really nice to have some help from the compiler, and I wonder how
>>> composition and protocols would be helpful here at all.
>>> 
>> 
>> As an intermediary measure, this seems like an interesting QoI
>> improvement for the compiler: warn when super.foo() is not called in
>> the overridden method. 
> 
> Please no.  Methods that need to be called when they are overridden are
> almost always a result of poor design.
> 
>    “I don't always do Object Oriented Programming, but when I do, I use
>    the Template Method Pattern"
> 
> understating-the-case-ly yrs,

I agree, that’s why I’m suggesting it be a ObjC-side attribute for use by e.g. UIKit. Regardless of how both of us may feel about UIKit’s design, it is the largest platform on which apps are made and there’s a chance for the compiler to enhance the developer experience. I do agree that we should be careful about condoning the practice for new/Swift-only frameworks.

> 
> -- 
> -Dave
> 
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