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parallel-hashmap
A family of header-only, very fast and memory-friendly hashmap and btree containers.
So I created a monstrosity that serves my purpose, but it is riddled with antipatterns and quirks to allow native vector performance on data retrieval and insertions. https://github.com/perara/perhash
You should look for flat-hash-maps. This is a good implementation, skarupke/flat_hash_map. The author also has a talk about the implementation at one of the boost conferences on youtube.
NOTE:
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Hence, a higher number means a more popular project.