Pass enum variable as const ref arg

[Q. Schroll]

On Friday, 4 December 2020 at 12:54:25 UTC, Andrey wrote:
> [...]
> WTF?

If you come from a C or C++ background, it's quite reasonable to 
think of enum stuff like a #define macro. You're using static 
arrays, but note that array literals allocate in many use cases. 
It really is like a C/C++ macro. Use n times = allocate n times. 
You avoid that with a static immutable completely. That said, if 
you use the value of that enum only at compile-time, there's no 
need for a static immutable.

Hope that this rule of thumb sheds some more light on how to 
achieve certain stuff.