Finding out ref-ness of the return of an auto ref function

[Arafel]

Hi all,

I'm hitting a problem that it's making crazy... is there any way to find 
out if the return of an `auto ref` function is actually ref or not?

So, according to the documentation [1] it depends on the return 
expressions... however in my case I'm implementing `opDispatch` in a 
wrapper type (and trying to carry over the ref-ness), so I don't know 
how can I check it.

Now, the whole point of this wrapper is to act differently based on 
whether the return is a reference or not (it already checks for 
`hasIndirections`, which btw doesn't help here either).

I've tried to use `__traits(isRef, ??? ) but I haven't been able to find 
out how to use it, it seems to be meant for parameters. Perhaps it would 
make sense to have something like `traits(isRef, return)`?

Also I have tried making two different overloads, with and without ref, 
but it didn't work either...

A.


[1]: https://dlang.org/spec/function.html#auto-ref-functions