[swift-evolution] [Proposal] More Powerful Constraints for Associated Types

[David Sweeris]

Is that bad? We already have conditional inheritance in classes:
	class Foo<T where _constraint_> : Bar<T> {}
If you move the where clause to the right:
	class Foo<T>  : Bar<T where _constraint_> {}
And drop the generic arguments:
	class Foo : Bar where _constraint_ {}
The only difference is “protocol” vs “class”.

- Dave Sweeris

> On Apr 25, 2016, at 10:41 PM, Dmitri Gribenko via swift-evolution <swift-evolution at swift.org> wrote:
> 
> On Mon, Apr 25, 2016 at 8:28 PM, Douglas Gregor via swift-evolution
> <swift-evolution at swift.org> wrote:
>> Did you consider an alternate syntax that puts the where clause outside the
>> braces, e.g.,
>> 
>> protocol R : Q where AssocType : P {
>>  // …
>> }
> 
> To me this reads like declaring a conditional conformance.
> 
> Dmitri
> 
> -- 
> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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