structs inheriting from and implementing interfaces

[rjframe]

On Fri, 29 Dec 2017 12:39:25 +0000, Nicholas Wilson wrote:

> On Friday, 29 December 2017 at 12:03:59 UTC, Mike Franklin wrote:
>
> The problem is that interfaces are a runtime thing (e.g. you can cast a
> class to an interface)
> structs implement compile time interfaces via template duck typing
> (usually enforced via an if()).
> you could probably write a wrapper that introspected an interface and
> enforced that all members were implemented.

I've actually thought about doing this to get rid of a bunch of if 
qualifiers in my function declarations. `static interface {}` compiles but 
doesn't [currently] seem to mean anything to the compiler, but could be a 
hint to the programmer that nothing will directly implement it; it's a 
compile-time interface. This would provide a more generic way of doing 
stuff like `isInputRange`, etc.