Lexicographical object comparison by selected members of a struct

[Tejas]

On Saturday, 21 August 2021 at 06:58:47 UTC, Ali Çehreli wrote:
> On 8/20/21 11:19 PM, Tejas wrote:
>> [...]
>
> Yes. 'static foreach' does not introduce scope, which can be 
> pretty useful. For example, one can define functions at module 
> scope.
>
> The subtle differences between 'static foreach' and 
> '(compile-time) foreach' can be surprising. For example, I 
> don't understand why I can't use
>
>   foreach (i; 0 .. members.length) {
>     enum ident = __traits(identifier, members[i]);
>     // ...
>   }
>
> Error: variable `i` cannot be read at compile time.
>
> I think it should be. :) members.length is compile-time; so, 
> 'i' should be compile time.
>
> And then, why can't 'static foreach' iterate over 'members'?
>
>   static foreach (member; members) {{
>     // ...
>   }}
>
> Error: value of `this` is not known at compile time
>
> Hm? Well, I am happy that there is always a path through. :)
>
> Ali

Maybe it has something to do with that compile-time vs 
compile-time thing by quickfur on the dlang wiki.

I was more impressed that you found that hack in the first place