write once type?

[ichneumwn]

On Tuesday, 20 April 2021 at 20:04:17 UTC, Steven Schveighoffer 
wrote:
> I just realized, this is Rebindable, or tail-const. (I don't 
> need the head to be truly const, I just need to be able to copy 
> into a const-referring thing). I currently am using a pointer, 
> which is working, but I prefer not to use it, and it is not 
> general enough.
>
> -Steve

Ah, you found it - I was looking up the reference for it and you 
replied in the mean-time. Ignore my answer :)