variant visit not pure?

[Dukc]

On Thursday, 7 May 2020 at 20:12:03 UTC, learner wrote:
>
> Modules of D standard library aren't in a good shape, if 
> everyone suggests alternatives for a basic building block as 
> variant.

I don't think Variant as a whole is the problem, when one uses it 
as the infinite variant it does fairly much what one can expect. 
The finite-field specialization of it is the one that's badly 
implemented.

>
> The types VariantN can hold are known at compile time, why 
> can't it be specialized?

It could, probably. This shows the biggest weakness (and 
strength) of D development: It's voluntary, so people work on 
that they happen to want to. That makes it unevenly developed 
compared to financially backed projects. We have both plenty of 
cool & rare features and lack of many relatively basic ones at 
the same time.