some general questions about packs

[samuelpmish]

Hi, I've been playing with some of the improved pack expansion tools in circle, and it seems like a really cool feature. My two questions are:

1. Is there a way to expand packs inside a function parameter list? I didn't see any examples of this in this repo and wasn't able to figure it out on my own. See for example:

https://godbolt.org/z/z1K6WGcxK (specifically lines 15-17)

2. Is it possible to make aliases for pack expressions? For example, in the compiler explorer code, @member_names(struct_t) appears about half a dozen times inside struct SoA { ... }; , is there a way to do something like

using names = @member_names(struct_t) ... ;

in the struct scope, to make the implementation cleaner?

[seanbaxter]

1. Yes, there's an old feature to expand packs inside a function parameter list. But there's also a new feature that I'm polishing up. I'll write a README.md on that when it's ready. It's a big improvement.
2. There's a new mechanism for setting the names of member pack declarations. I'll also put that in the upcoming readme. Hang tight for a bit.