remove duplicates from a list 28keep first occurrence 29

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Salvatore
01 Feb 2018
1list_rset([], []).                     % keep rightmost occurrences
2list_rset([E|Es], Rs0) :-
3   if_(memberd_t(E, Es),
4       Rs0 = Rs,
5       Rs0 = [E|Rs]),
6   list_rset(Es, Rs).
7
8list_lset([], []).                     % keep leftmost occurrences
9list_lset([E|Es], Ls) :-
10   post_pre_lset(Es, [E], Ls).         % uses internal auxilary predicate
11
12post_pre_lset([], _, []).            
13post_pre_lset([E|Es], Pre, Ls0) :-     % 2nd arg: look-behind accumulator
14   if_(memberd_t(E, Pre),
15       Ls0 = Ls,
16       Ls0 = [E|Ls]),
17   post_pre_lset(Es, [E|Pre], Ls).
18
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