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Re:Libc++'s Implementation of std::string by pjscott on Thursday January 30, 2020 @09:56PM (#22198573)
I think this is the talk you're referring to. If not, it's still definitely worth a watch:

https://www.youtube.com/watch?v=kPR8h4-qZdk

Re:Libc++'s Implementation of std::string by stuffypages on Thursday January 30, 2020 @10:57PM (#22198897)
Part of the motivation for writing this blog post was that I enjoyed this talk so much.