On Mon, 04 Jul 2011 14:20:32 +0400, Stas Boukarev wrote: > Tamas Papp <tkp...@gmail.com> writes: > >> On Mon, 04 Jul 2011 11:39:39 +0200, Hans Hübner wrote: >> >>> On Mon, Jul 4, 2011 at 11:31 AM, Tamas Papp <tkp...@gmail.com> wrote: >>>> Why do some CL library functions have :key arguments? >>> [...] >>>> but it is a bit cumbersome. I can make my code simpler by relying on >>>> calls like >>>> >>>> (quantiles (map 'vector key vector) quantiles) >>> >>> This not only conses "a bit more", it also duplicates traversal >>> efforts - The original list must be traversed, and the consed-up list >>> of key values as well. I think it is prudent that the CL library >>> functions offer ways to reduce consing for cases where "a bit" is too >>> much (and "a bit" can become a lot if a program operates on long >>> lists). >> >> I understand this. My main question is: why not do this with compiler >> macros? Is there any reason for this, other than historical? > Because it's not easy to do with compiler macros.
Can you (or someone) please elaborate on that? I have just started reading up on compiler macros, and I don't understand why. Thanks, Tamas _______________________________________________ pro mailing list pro@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/pro