Update cppreference with mdspan

[bernhardmgruber]

Hi! I am working with mdspan every now and then, so, naturally, I need to consult its documentation. I usually used P0009 as a reference, but since it was approved in WG21 plenary and merged to the C++ working draft, it has not been updated anymore. Several follow-up papers have been proposed and accepted in the meantime, so there is no longer a single up-to-date reference.

At some point I noticed someone started populating cppreference with mdspan: https://en.cppreference.com/w/cpp/container/mdspan. However, just the synopsis of std::mdspan is given. It would really help me as a user, if you could take a bit of time to add a synopsis for the related classes as well, e.g. for the layouts and accessors. Also, consider adding the individual pages for each member function so at least the up-to-date signature is browsable there.

I understand this may be quite time consuming, so maybe focus on just the content from the proposals for now. Examples can for sure be added later! Thank you!

[mhoemmen]

@bernhardmgruber Try this: http://eel.is/c++draft/views#mdspan.syn

[bernhardmgruber]

Yeah, I should have thought about that myself :D Thx!

Still, would also be great to have it on cppreference! :)

[crtrott]

Do we know any editors?

[mhoemmen]

Do you mean cppreference editors? It's a wiki so in theory we could do it.