Dan Bensen  <randomgeek@cyberspace.net> wrote:
+---------------
| rocco.rossi@gmail.com wrote:
| > (setf (values a b c) (values-list '(2 3 5)))
| 
| No, VALUES isn't quite that flexible.
+---------------

Uh... Actually, Sir, it certainly *is*!!

    http://www.lisp.org/HyperSpec/Body/sec_5-1-2-3.html
    5.1.2.3 VALUES Forms as Places

    A values form can be used as a place, provided that each
    of its subforms is also a place form.
    ...
    (setf (values place-1 ...place-n) values-form) 

For example:

    > (deflex a 'a)    ; Pardon my DEFLEX, less typing than (defvar *a* ...)

    A
    > (deflex b (list 'b 'bb 'bbb))

    B
    > (deflex c (vector 'c 'cc 'ccc 'cccc))

    C
    > (list a b c)

    (A (B BB BBB) #(C CC CCC CCCC))
    > (setf (values a (second b) (aref c 2)) (values-list '(2 3 5)))

    2
    3
    5
    > (list a b c)

    (2 (B 3 BBB) #(C CC 5 CCCC))
    > 

+---------------
| I've never seen VALUES used anywhere except where the values
| are received by one of the multiple-value-* forms.
+---------------

Well, now you have!  ;-}  ;-}

+---------------
| You also can't use it as function arguments.
+---------------

You can, but of course you'll only pass the first one:

    > (list (values 1 2 3) (values 4 5 6 7) (values 8 9) 10)

    (1 4 8 10)
    >

Though if you do want to pass *all* the values, have a look at:

    http://www.lisp.org/HyperSpec/Body/speope_multiple-value-call.html
    ...
    (multiple-value-call #'list 1 '/ (values 2 3) '/ (values) '/ (floor 2.5))
    =>  (1 / 2 3 / / 2 0.5)


-Rob

-----
Rob Warnock			<rpw3@rpw3.org>
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