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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Queue-Definition/Prolog/queue-definition.pro Normal file
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empty(U-V) :-
unify_with_occurs_check(U, V).
push(Queue, Value, NewQueue) :-
append_dl(Queue, [Value|X]-X, NewQueue).
% when queue is empty pop fails.
pop([X|V]-U, X, V-U) :-
\+empty([X|V]-U).
append_dl(X-Y, Y-Z, X-Z).