Contributions after C++23 mdspan.

[Tomasz Kaminski]

On Wed, Jun 4, 2025 at 6:03 PM Luc Grosheintz <luc.grosheintz@gmail.com>
wrote:

> > Firstly, thank you very much for your contributions, they are really
> > appreciated.
>
> Thank you! I'm glad to hear it.
>
> > One option would be to continue with mdspan later mappings, but I will
> > understand
> > if you would like to take a break from the topic.
>
> Locally, I have "complete" patches for: default_accessor and mdspan.
> I'll start sending them soon. I don't want to send too much at once.
>
> This is (a roundabout version of) the email asking if I can start
> preparing layout_{left,right}pad (and then keep going until the
> we finish all md-related C++26 features)?
>

After a bit of consideration, I would greatly appreciate if you could look
into implementing
this one, we are working on stabilizing C++20, and consider having this
change as DR for
span (so we want implementation that will work in C++20):
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p3029r0.html

Afterwards, I agree that working on padded layout makes a lot of sense,
even landing them
before we will start looking into "optimizing" indexing computation. I
would consider updating
__linear_index_left to accept the first extent.

Regards,
Tomasz
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