Helfer Herbrand2

Jan Burse, erstellt 03. Jul 2019
* Compatiblity library for sto/1, SICStus Prolog variant.
* Verification of sto/1 before unification.
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* functionality to the library. Not to be distributed with additional
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:- module(herbrand2, [sto/1]).
:- use_module(library(atts)).
:- attribute(herbrand2/1).
sto(X) :-
get_atts(X, herbrand2(_)), !.
put_atts(X, herbrand2(X)).
( contains(V, L) -> fail
contains(X, [Y|_]) :-
X == Y, !.
contains(X, [_|Y]) :-
contains(X, Y).