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avoid choice-point in ord-union.

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Vitor Santos Costa 2011-05-08 23:11:40 +01:00
parent 77407bc14e
commit 14bae4cb7e
1 changed files with 2 additions and 2 deletions
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4
library/ordsets.yap
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@ -274,8 +274,8 @@ ord_symdiff(>, Head1, Tail1, Head2, Tail2, [Head2|Difference]) :-
% is true when Union is the union of Set1 and Set2. Note that when
% something occurs in both sets, we want to retain only one copy.
ord_union(Set1, [], Set1) :- !.
ord_union([], Set2, Set2) :- !.
ord_union([S|Set1], [], [S|Set1]).
ord_union([], Set2, Set2).
ord_union([Head1|Tail1], [Head2|Tail2], Union) :-
compare(Order, Head1, Head2),
ord_union(Order, Head1, Tail1, Head2, Tail2, Union).