[Openmcl-devel] Weird code
james.anderson at setf.de
Sun Sep 12 07:00:58 PDT 2010
On 2010-09-11, at 10:45 , Gary Byers wrote:
> The #_ does something like the following (with some
> details glossed over):
even after which explanation, the question remains, why this process
requires a reader macro.
(as noted further in the text.)
> (The macro that Ron found probably would be simpler if it expanded
> into something like
> (external-call "memset" ...)
> instead of doing what it's doing. I wouldn't be shocked if the
> idiom was used in a few other places (or if those other places also
> to ensure that the expected readtable was in effect.)
> People who used MCL may remember something called REQUIRE-TRAP; it
> existed for
> the reasons outlined above and may have been implemented in terms
> of READ-FROM-STRING.
which is what had led me to ask the question. my recollection is
that, when i was worried about the execution context of that class of
operation, i called require-trap/load-trap directly. which reads as
if it operates on the given symbol - without recourse to the reader.
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