Thanks a lot for mentioning it! :-) Ewig uses RRB-Trees (Relaxed Radix Balanced Trees) which like ropes, is confluent (supports fast concatenation) but has ver

Thanks a lot for mentioning it! :-) Ewig uses RRB-Trees (Relaxed Radix Balanced Trees) which like ropes, is confluent (supports fast concatenation) but has very stable bounds otherwise, similar to a vector-like type. EDIT: The parent mentions a video, I gues it is the CppNow talk: https://www.youtube.com/watch?v=ZsryQp0UAC8 https://www.youtube.com/watch?v=ZsryQp0UAC8 Last week I did another version of that talk at CppCon (with slightly deeper coverage of Ewig) but I don't think it is in Youtube yet.