If someone is interested I simplified the code, commented some more and
added the unmarshall json in the example -
https://go2goplay.golang.org/p/I_ezQ9wyWVx.
Still, I don't know how to type the BuildEmptySpec() in BoxBaseI better
than to return a simple interface{}... If it would
return BoxSpecI(BoxBaseI) it would not be enough.
Aleksandar
On Fri, Jul 3, 2020 at 1:54 PM Aleksandar Milovanović <
aleksan...@videobolt.net> wrote:
> Hi guys,
>
> Thanks for the effort, it is much needed for quite some time. I really
> appreciate the way of introducing the changes, go2go tool and open
> discussion, so I wanted to review them and participate with feedback so you
> can do the best job of understanding the world. With proposed changes, I
> think extending language to support something similar to polymorphism might
> be cheap.
>
> Consider this go playground: https://go2goplay.golang.org/p/jqA4ccWeAKD.
>
> Syntax is awkward currently (some syntax sugar is definitively needed),
> but the point in the test below stands - you do have polymorphic slice, you
> can use base fields and methods, and you can cast to the child structure
> (which contains all the fields and methods from the base). json marshaling
> was added to the example, json unmarshal could be implemented similarly,
> but in that case we need provided mapping from base structure to the
> specialized one, which can't be typed with current generics (for some of
> it, interface{} and reflect would be needed). Could provide that example as
> well, if needed.
>
> Sending this idea as I think it might be interesting, and I think you
> might get some more ideas out of it.
>
> Aleksandar
>
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