PhobosV3+ Fundamental Elements

[Kapendev]

On Thursday, 27 August 2026 at 22:39:04 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> The following document is a collaboration between Adam Wilson 
> and Richard (Rikki) Andrew Cattermole.
>
> The PhobosV3+ work, is comprised of multiple components.
> The first of these is ``based``, this is a low level component 
> that comprises of target specific elements to druntime, 
> druntime is the platform specific elements and may contain 
> target independent code.
>
> The PhobosV2 replacement elements comprises of a base library, 
> and auxiliary libraries built on top.
>
> ```
> GUI toolkit         |       web service framework
> --------------------------------------------------
>             Event loop/windowing
> --------------------------------------------------
>               PhobosV3 base
> --------------------------------------------------
>                  druntime
> --------------------------------------------------
>                   based
> ```

Random thought: it would be nice if there could be an "IO layer" 
or something that abstracts over system libraries. Something to 
keep the Phobos part pure D in a way. Phobos currently tends to 
call some system libraries directly, for example. This is 
probably what BASED might be based on the "target specific 
elements" comment?
Also, when I say IO layer, I don't mean what the Zig guys are 
doing with passing a vtable around at runtime. Just a basic 
compile-time abstraction layer.

> One of the key design elements that is wanted, is to remove the 
> requirement for templates where possible. Templates are 
> expensive, especially if they are not needed to solve a problem.

It's easy to go crazy with compile-time stuff in any language 
really, from what I have seen.
Just a guide like "start with no templates or generics and then 
maybe" could help a lot.
Same guide should apply to RTTI related things, if that will be a 
thing.
Both RTTI and templates add complexity that make code harder to 
read or document.

---

> To add or not to add? Umm, I only have one life and templates 
> are fun anyway - Monkyyy