diogo/yap-6.3
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

flatten does not need to be defined as a system predicate.

Browse Source 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@2287 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
This commit is contained in:
vsc 2008-07-16 10:34:00 +00:00
parent d8e5f2c895
commit dc45cde7ee
1 changed files with 1 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
library/swi.yap
View File

@ -64,6 +64,7 @@ swi_predicate_table(_,nth(X,Y,Z),lists,nth(X,Y,Z)).
swi_predicate_table(_,delete(X,Y,Z),lists,delete(X,Y,Z)).
swi_predicate_table(_,nth1(X,Y,Z),lists,nth(X,Y,Z)).
swi_predicate_table(_,memberchk(X,Y),lists,memberchk(X,Y)).
swi_predicate_table(_,flatten(X,Y),lists,flatten(X,Y)).
swi_predicate_table(_,member(X,Y),lists,member(X,Y)).
swi_predicate_table(_,append(X,Y),lists,append(X,Y)).
swi_predicate_table(_,append(X,Y,Z),lists,append(X,Y,Z)).
@ -316,26 +317,3 @@ prolog:intersection([_|T], L, R) :-
prolog:(Term1 =@= Term2) :-
variant(Term1, Term2), !.
%% flatten(+List1, ?List2) is det.
%
% Is true it List2 is a non nested version of List1.
%
% @deprecated Ending up needing flatten/3 often indicates,
% like append/3 for appending two lists, a bad
% design. Efficient code that generates lists
% from generated small lists must use difference
% lists, often possible through grammar rules for
% optimal readability.
prolog:flatten(List, FlatList) :-
flatten(List, [], FlatList0), !,
FlatList = FlatList0.
flatten(Var, Tl, [Var|Tl]) :-
var(Var), !.
flatten([], Tl, Tl) :- !.
flatten([Hd|Tl], Tail, List) :- !,
flatten(Hd, FlatHeadTail, List),
flatten(Tl, Tail, FlatHeadTail).
flatten(NonList, Tl, [NonList|Tl]).