Hi, I haven't thought of that idea. But it does look ugly, doesn't it? ;)
Pascal On 6 May 2012, at 21:07, Robert Smith wrote: > Hello, > > You say #+nil is not reliable, which I agree with. However, what I'm > in the habit of using is #+#:ignore, which AFAIK should be always > reliable: #:ignore won't and can't be interned. > > Even if #:ignore is in your features, it won't help. > > CL-USER> (push '#:ignore *features*) > (#:IGNORE ...) > CL-USER> (+ 1 #+#:ignore 2 3) > 4 > > I do use this in practice, and I also use it as a form of > documentation on why I'm commenting something out. As a sort of > contrived example: > > (defun f () > #+#:ignore-buggy > (progn ...) ; buggy code > > (progn ...)) ; working code > > Though, this is certainly clunkier than a dedicated #; macro. > > Cheers! > > Robert Smith > [email protected] > > On Sun, May 6, 2012 at 1:57 PM, Pascal Costanza <[email protected]> wrote: >> Hi, >> >> I'm thinking about writing up a CDR on #;-style comments. Currently, if you >> want to comment out a form from CL code, there is no standard way of doing >> this. Many people use something like #+nil, or similar tricks, but this is >> not 100% reliable. R6RS Scheme introduced #; as a solution, and this seems >> to become somewhat popular in CL as well. >> >> Here is a suggested wording. >> >> ------------- snip ----------------- >> >> #; is used to comment out single expressions; the syntax is /#; expression/. >> This textual notation is treated as whitespace; that is, it is as if the >> ``#; expression'' did not appear and only a space appeared in its place. >> >> #; operates by skipping over the form. Skipping over the form is >> accomplished by binding *read-suppress* to true and then calling read. >> >> ------------- snip ----------------- >> >> The text is based on 2.4.8.17 of the HyperSpec. Yes, this would be a fairly >> short CDR document. >> >> Any comments or ideas about this? >> >> >> Best, >> Pascal >> >> -- >> Pascal Costanza >> >> >> >> >> _______________________________________________ >> pro mailing list >> [email protected] >> http://lists.common-lisp.net/cgi-bin/mailman/listinfo/pro -- Pascal Costanza _______________________________________________ pro mailing list [email protected] http://lists.common-lisp.net/cgi-bin/mailman/listinfo/pro
