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dynamic clauses in gprolog

From: Tia Watts
Subject: dynamic clauses in gprolog
Date: Tue, 08 May 2001 15:47:20 +0100

I have been trying (unsuccessfully) to declare a predicate as dynamic in gprolog - Would someone be able to supply me with some examples?
Here is what I have been trying:
Given a .pl file that contains:
    makepred(A,B) :- assertz(pred(A,B)).
If I load this file and enter:
    | ?- makepred(c,d).
I receive the error message:

    uncaught exception: error(permission_error(modify,static_procedure,pred/2),assertz/1)

Thank you for any insights you can provide!
Tia Watts

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