Curious effect with traits, meta, and a foreach loop ... mystifies me.

[james.p.leblanc]

On Tuesday, 7 September 2021 at 17:33:31 UTC, Adam D Ruppe wrote:
> On Tuesday, 7 September 2021 at 17:24:34 UTC, james.p.leblanc 
> wrote:
>
> If you want to do a runtime lookup, you need to separate the 
> two pieces. This pattern works:
>
>
> switch(runtime_index) {
>    foreach(i, val; item.tupleof)
>      case i:
>            // use val
> }
>
> So the switch is at runtime but the loop and cases are all 
> known at compile time.

Adam,

Thanks for the very fast, and very thorough explanation.  I 
especially
appreciate the fact that you seem to have predicted where my 
thoughts
were heading with my experiments ...

The "switch(runtime_index)" snippet will come in handy ...

What I would **REALLY** like is to be able to do (but I think 
this is
impossible) would be to "dig out" the needed "x" array depending 
on
which one of them suits my alignment needs.  (Yes, I am still 
playing
with avx2 ideas ...).

What I mean by "dig out" the needed "x" is:  if I could 
alias/enum/
or someother  trick be then able just to use that "x" as a simple 
static array.

(I doubt this is possible ... but .... ?).

Thanks again, Keep Warm in Upstate!
James