On Mon, Aug 20, 2012 at 4:52 PM, Tara Lorenz <[email protected]> wrote:
> while trying to get cl-num-utils running on ECL i encountered a problem
> with let-plus in combination with define-modify-macro.
>
> Informal description: When define-modify-macro defines a three-argument
> "modifier", ECL complains about "wrong number of arguments" when used in
> combination with let-plus and structure slots. I see no problems when
> used outside of let-plus. I also see no problems when i use a two
> argument modifier.
>
I believe the problem is in the SYMBOL-MACROLET used by LET+. LET+ encloses
everything on a SYMBOL-MACROLET that defines expansions for the LET+
arguments. The problem is that some of the LET+ symbols that you used, MEAN
and TALLY, are also used in the LAMBDA form from the define-modify-macro.
In other words, your code is roughly equivalent to
(LET ((#:VALUE210 ACCUM))
(DECLARE (IGNORABLE #:VALUE210))
(SYMBOL-MACROLET ((MEAN (MEAN-ACCUMULATOR-MEAN #:VALUE210))
(TALLY (MEAN-ACCUMULATOR-TALLY #:VALUE210)))
(INCF TALLY)
(INCF-NOOP TALLY 1)
(INCF-MEAN MEAN VALUE TALLY)))
When INCF-MEAN is expanded to
(LET* ((#:G205 VALUE) (#:G206 TALLY))
(DECLARE (:READ-ONLY #:G205 #:G206))
(SETQ MEAN
((LAMBDA (INCF-TEST::MEAN INCF-TEST::VALUE INCF-TEST::TALLY)
(+ INCF-TEST::MEAN
(/ (- INCF-TEST::VALUE INCF-TEST::MEAN) INCF-TEST::TALLY)))
MEAN #:G205 #:G206)))
the uses of VALUE and MEAN in the lambda form are interfered by the
SYMBOL-MACROLET.
Juanjo
--
Instituto de Física Fundamental, CSIC
c/ Serrano, 113b, Madrid 28006 (Spain)
http://juanjose.garciaripoll.googlepages.com
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