Kent M Pitman <pitman@world.std.com> wrote:
+---------------
| Peter Seibel <peter@javamonkey.com> writes:
| > >>>>> "Kalle" == Kalle Olavi Niemitalo <kon@iki.fi> writes:
| > Kalle>   (multiple-value-call #'values (funcall fn) warning)
| > 
| > Duh. Thanks.
| 
| I recommend instead:
| 
|  (values (multiple-value-list (funcall fn)) warning)
| 
| The problem is otherwise that if fn has a variable number of
| return values, you'll confuse it.
+---------------

One thing that would help with Kalle's version would be to change
the protocol for SAFE-FUNCALL (or whatever the name was) to swap
the position of the warning/error return value with the function's
value(s):

	(multiple-value-call #'values warning (funcall fn))

thus removing the ambiguity. The first value is then *always*
an error-p, and the remaining however-many values (if any) come
from the called function.


-Rob

-----
Rob Warnock, PP-ASEL-IA		<rpw3@rpw3.org>
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