function hash for prolog terms?

[Daniel Jiménez Gentil]

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.

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