diogo/yap-6.3
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update length to use skip_list/3.

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Vitor Santos Costa 2012-01-09 23:46:17 +00:00
parent 3f97a3f24a
commit 805ad7f958
1 changed files with 6 additions and 1 deletions
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7
pl/sort.yap
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@ -24,7 +24,12 @@
% length of a list. % length of a list.
length(L,M) :- ( var(M) -> '$$_length1'(L,M,0) ; '$$_length2'(L, M) ). length(L, M) :-
'$skip_list'(M0, L, R),
( R == [] -> M = M0 ;
var(R) -> '$$_length1'(R, M, M0) ;
'$do_error'(type_error(list,L),length(L,M))
).
'$$_length1'([], M, M). '$$_length1'([], M, M).
'$$_length1'([_|L], O, N) :- '$$_length1'([_|L], O, N) :-