A hash array-mapped trie implementation in C
Long-simmering side project that is finally ready to see the light. HAMTs are a cool persistent data structure and implementing one has been a lot of fun. Beyond the code, there is likely some value in the extensive and largely complete implementation docs; basic benchmarks are linked in the README, too. Kind of aiming to be "the libavl for HAMTs". That is obviously a high and aspirational bar but a distinct possibility if it stirs up a little interest and/or contribution. Anyways, it's time for this to go out, collect feedback and maybe even some use outside of toy projects. Let me…
In plain words
A C library implementing hash array-mapped tries (HAMTs), a persistent data structure for efficient key-value storage. The project includes comprehensive documentation and benchmarks, designed as a reference implementation similar to libavl. It targets developers building systems requiring immutable or persistent data structures, offering both usable code and educational resources for understanding HAMT design and performance characteristics.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Long-simmering side project that is finally ready to see the light. HAMTs are a cool persistent data structure and implementing one has been a lot of fun. Beyond the code, there is likely some value in the extensive and largely complete implementation docs; basic benchmarks are linked in the README, too. Kind of aiming to be "the libavl for HAMTs". That is obviously a high and aspirational bar but a distinct possibility if it stirs up a little interest and/or contribution. Anyways, it's time for this to go out, collect feedback and maybe even some use outside of toy projects. Let me know how it goes.
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