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AW: function hash for prolog terms?

From: ibl
Subject: AW: function hash for prolog terms?
Date: Tue, 10 Feb 2004 13:47:29 +0100

> -----Ursprüngliche Nachricht-----
> Von: address@hidden
> [mailto:address@hidden Auftrag von
> Daniel Jiménez Gentil
> Gesendet: Dienstag, 10. Februar 2004 12:18
> An: address@hidden
> Betreff: function hash for prolog terms?
> Hello,
> I am working using the interface of GNU-Prolog for C.
> I need a function that returns me an unique number for each
> prolog term. Up
> to now I am using the following one
> int hash(PlTerm termino_prolog) {
>   return abs (Rd_Code (termino_prolog));
> }
> But there are cases in those that it stops oneself prolog term it
> returns me
> different values.
> Thank you for your help.


while I don't know about the semantics of "Rd_Code", I suspect, that the
returned information might be not unique to a specific term.

For a true hash you need a guaranteed unique function however.

So I would suggest, that you implement it as follows:

term_hash(Term,Hash) :-

Of course, this would involve an implementation of "my_md5_digest".
You can easily wrap a "stock" MD5 function, written in C, to perform this


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