From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Daniel Colascione <dancol@dancol.org>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] trunk r116995: cl-lib defstruct introspection
Date: Mon, 21 Apr 2014 23:28:09 -0400 [thread overview]
Message-ID: <jwveh0qm4j2.fsf-monnier+emacsdiffs@gnu.org> (raw)
In-Reply-To: <5355CECF.2050803@dancol.org> (Daniel Colascione's message of "Mon, 21 Apr 2014 19:07:11 -0700")
> Something like this. (This is the private code I was talking about, so
> it doesn't use the sames in the checked-in patch.)
> (defmacro* jez-with-slots (spec-list (type inst) &body body)
> "Like `with-slots', but for structs."
> (if (symbolp inst)
> `(symbol-macrolet
> ,(loop for spec in spec-list
> collect `(,spec (jez-slot-value ',type ,inst ',spec)))
> ,@body)
> (let ((inst-symbol (gensym "with-struct-slots")))
> `(let ((,inst-symbol ,inst))
> (jez-with-slots
> ,spec-list ,inst-symbol ,@body)))))
Ah, I see now, thanks, yes that makes sense.
Stefan
PS: Of course, I wouldn't implement it that way ;-)
I'd start by testing `inst' against `type' and then use straight (aref
...) or (nth ...) for the accessors.
But indeed, you'd want to circumvent the usual accessors.
next prev parent reply other threads:[~2014-04-22 3:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1Wbhqn-0001CJ-4X@vcs.savannah.gnu.org>
2014-04-20 12:49 ` [Emacs-diffs] trunk r116995: cl-lib defstruct introspection Stefan Monnier
2014-04-23 12:56 ` Stefan Monnier
2014-04-21 15:38 ` Stefan Monnier
2014-04-21 17:40 ` Daniel Colascione
2014-04-21 22:03 ` Stefan Monnier
2014-04-21 22:26 ` Daniel Colascione
2014-04-22 2:03 ` Stefan Monnier
2014-04-22 2:07 ` Daniel Colascione
2014-04-22 3:28 ` Stefan Monnier [this message]
2014-04-23 3:18 ` Declaim and proclaim (Was: Re: [Emacs-diffs] trunk r116995: cl-lib defstruct introspection) Daniel Colascione
2014-04-23 13:14 ` Declaim and proclaim Stefan Monnier
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