RE: TR: [cl-ppcre-devel] New release 1.2.4

8 Mar 2005


      Edi Weitz [edi@agharta.de] wrote:
...
On Tue, 8 Mar 2005 10:52:47 -0600, Kick Damien-DKICK1
<DKICK1@motorola.com> wrote:
...
Personally, I still would like to know of an easy way to change
these settings.
Me too.  If there's a simple idiom for this I'll be happy to
incorporate it into CL-PPCRE.
Silly Damien, RTFM.  There was a X3J13 issue
<http://tinyurl.com/6mw2d> in which the ability to write macros that
expanded into declaration forms was removed.  The discussion of the
issue includes examples of how to acheive the wanted affect.  For the
moment, the following is my favorite:

    Another tactic would be:

       Old code: (EVAL-WHEN (EVAL COMPILE LOAD)
                   (DEFVAR *SPEEDY* NIL))
                 (DEFMACRO USE-STANDARD-SPEED-AND-SAFETY ()
                   (IF *SPEEDY*
                       `(DECLARE (OPTIMIZE (SPEED 3) (SAFETY 0)))
                       `(DECLARE (OPTIMIZE (SPEED 0) (SAFETY 3)))))
                 (DEFUN FOO ()
                   (USE-STANDARD-SPEED-AND-SAFETY)
                   ...)
       New code: (EVAL-WHEN (EVAL COMPILE LOAD)
                   (DEFVAR *STANDARD-SPEED-AND-SAFETY*
                           '((SPEED 0) (SAFETY 3))))
                 (DEFUN FOO ()
                   (DECLARE (OPTIMIZE #.*STANDARD-SPEED-AND-SAFETY*))
                   ...)

--
Damien Kick