+1. > On Nov 15, 2016, at 19:53 , Jonathan Hull via swift-evolution > <[email protected]> wrote: > > I would like to be able to get, at runtime, an array of all types conforming > to a particular protocol. (Similarly, I would like to be able to get an > array of all subtypes of a given type). Is this in the generics manifesto? > If not, can it be added? What is the timeframe? > > It seems to me, that the compiler should actually already have this > information, and it is just a matter of keeping it around when it is > requested. I could be wrong about that though... > > Why do I want this? It would make a lot of things like plug-ins and > extensible factories possible (and much easier where they are possible). For > example, you could add a new type to a factory (without the factory having to > be coupled to it) just by adhering to a protocol. It would also make > building a swift version of NSCoding much easier. > > I have asked for other, more complicated, language features (e.g. handler > funcs) to make those possible before, and I still want them (since I have > used them in other languages and it was enormously powerful), but I realized > that I should actually be able to make most of those features in a library > myself (albeit a bit slower than the compiler could) if I am able to get a > list of conforming types at runtime (and then call static methods on those > types). > > Also, if there is a way to do this now (even if it is slow), I would > appreciate the help… > > Thanks, > Jon > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution
-- Rick Mann [email protected] _______________________________________________ swift-evolution mailing list [email protected] https://lists.swift.org/mailman/listinfo/swift-evolution
