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Re:Hash Array Mapped Tries (HAMT) to the Rescue by neutronicus on Monday September 07, 2020 @10:21AM (#24399580)
There's a C++ implementation here:

https://github.com/arximboldi/immer

Re:Hash Array Mapped Tries (HAMT) to the Rescue by bjoli on Tuesday September 08, 2020 @02:31AM (#24405730)
Immer is amazing! I would suggest also looking at his work with transducers in the atria c++ library. The talk he gave about them is what made transducers really click for me.