optimizing diff, isec and uni for non-lists.

Also, these functions now support hashes.

* eval.c (eval_init): Register only the deprecated set-diff to
the set_diff function. The diff intrinsic is now going to the
new function named diff.

* lib.c (diff): New function.
(isec, uni): Rewritten to use seq_iter_t.

* lib.h (diff): Declared.

* txr.1: Documentation updated.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index 6d706b3d..08e7acb2 100644
--- a/lib.h
+++ b/lib.h
@@ -1078,6 +1078,7 @@ val drop_while(val pred, val seq, val keyfun);
 val drop_until(val pred, val seq, val keyfun);
 val in(val seq, val key, val testfun, val keyfun);
 val set_diff(val list1, val list2, val testfun, val keyfun);
+val diff(val seq1, val seq2, val testfun, val keyfun);
 val isec(val list1, val list2, val testfun, val keyfun);
 val uni(val list1, val list2, val testfun, val keyfun);
 val copy(val seq);