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Editorial Team
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Asked: 2026-05-27T21:53:11+00:00

I’m trying to implement some data structures (like HAMP-hash array mapped trie) in Common

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I’m trying to implement some data structures (like HAMP-hash array mapped trie) in Common Lisp and I need to get 32- or 64-bit hashes of objects which I want to store in these data structures.

I know I can put objects into Common Lisp hash tables (created with (make-hash-table)), but I couldn’t find a way to get a hash of an object, like hashCode of Java or hash of Python. Does Common Lisp have a function like that? If doesn’t, how does CL’s standard hash table generate hashes from arbitrary types of objects?

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1 Answer

  1. Editorial Team

    The function sxhash returns a hash for its argument. Details: sxhash.

    * (sxhash 'fred)
4287909749829334992
* (sxhash 'joe)
23906557261513707
* (sxhash 'fred)
4287909749829334992
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