Aliasing current function template instance

[Adam D. Ruppe]

On Friday, 1 May 2020 at 20:28:58 UTC, Jean-Louis Leroy wrote:
> Something I have overlooked? Any ideas?

There's an old rule, that I can't find in the spec anymore but 
I'm still pretty sure it is there, where taking the address of a 
template inside a template yields the current instantiation.

Then you can fetch the type of that and do some reflection off. 
So try this in your test rig:

    pragma(msg, Parameters!(typeof(&foo)));

This rule was in there to ease callbacks and recursive functions 
iirc but it can also work with you thanks to typeof turning the 
runtime address back into a compile time alias.