SWI-Prolog -- variant

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Predicate variant_hash/2

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Documentation
- Reference manual
  - Built-in Predicates
    - Database
      - Indexing databases
        
        term_hash/2
        
        term_hash/4
        
        variant_sha1/2
        
        variant_hash/2
- Packages

Availability:built-in

[det]variant_hash(+Term, -HashKey)

Similar to variant_sha1/2, but using a non-cryptographic hash and produces an integer result like term_hash/2. This version does deal with attributed variables, processing them as normal variables. This hash is primarily intended to speedup finding variant terms in a set of terms. ^{bugAs variant_sha1/2,
cyclic terms result in an exception.}