[swift-evolution] Abstract methods

[Slava Pestov]

Abstract methods and classes seem like they will introduce a fair amount of complexity in the type checker, particularly around metatypes and constructors, because now we have this new concept of a class that cannot be directly instantiated. I’m not sure the cost is worth the benefit.

Slava

> On Nov 2, 2017, at 12:45 PM, C. Keith Ray via swift-evolution <swift-evolution at swift.org> wrote:
> 
> How many "subclass must override" assertions or comments in base class methods do we need to see, to want to add "abstract" to the Swift language? 5? 50? 500?
> 
> It's a not uncommon idiom in Objective-C.
> 
> I'm about to port a substantial amount of C++ code to swift, and compiler help to enforce abstract classes would be very useful.
> 
> 
> --
> C. Keith Ray
> Senior Software Engineer / Trainer / Agile Coach
> * http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf <http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf>
> 
> 
> 
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