This was mentioned in our CppCon 2021 talk, but it hasn't yet actually made its way to the library. This is likely to be frustrating for many who found the library via the talk, so I wanted to give some backstory and share the future plans.
I had worked out the core details from the "units" side as far back as July 2021 (which is why it made it into the talk). However, before implementing a production version, I found Daniel Withopf's work (seen most recently in Daniel's CppCon 2022 talk). Besides the fact that it was essentially an existence proof for a production-quality solution, the most exciting aspect was that it also handled frames of reference. This was consistent with our internal experience that when it comes to matrices and vectors, supporting units is nice to have, but supporting reference frames adds much more value. At this point, reference frame support became an essential feature, which raised the bar for the production API design, to the point where it fell by the wayside.
In the long term, this may be for the best. In that intervening time, I wrote the new foundations and more fluent interfaces for the units library --- essentially, the parts that became Au. The matrix APIs we build on top of this stronger foundation will be much better and more usable than what we would have built in 2021. However, in the short term, it means we don't have any solution to offer, which I know is frustrating.
For clarity: this feature is still considered "in scope" for the library. I hope we will be able to provide an open source matrix solution that handles both units and reference frames, so the world can benefit. However, 2023 is a critical year for Aurora's product roadmap, so it's unlikely to happen in this year.
Meanwhile, if this is a feature you're interested in, please feel free to "vote" by reacting with 👍 to help us gauge community interest!
catskul, connorjak, tottaway, vinnnyr, JoostHouben and 10 more
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