From: "Stephen J. Turnbull" <stephen@xemacs.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: Re: Lisp object that refers to a C struct
Date: Wed, 17 Oct 2012 15:21:40 +0900 [thread overview]
Message-ID: <87r4ox62kr.fsf@uwakimon.sk.tsukuba.ac.jp> (raw)
In-Reply-To: <83r4ox3frd.fsf@gnu.org>
Eli Zaretskii writes:
> > What happens if someone passes you this same integer some time after
> > you've freed the C struct?
More interesting, what happens if somebody chooses "I feel lucky" and
passes you a random integer that happens to be a "live" watch?
ISTM it fails safe (ie, doesn't crash). But it's not good. So really
you want this to be entirely internal somehow. The only way to do
that is to have an opaque type that you can only get a pointer to from
the watch constructor.
All-I-need-to-know-about-ABCs-I-learned-in-kindergarten-ly y'rs,
next prev parent reply other threads:[~2012-10-17 6:21 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-15 21:24 Lisp object that refers to a C struct Eli Zaretskii
2012-10-16 1:07 ` Stefan Monnier
2012-10-16 3:53 ` Eli Zaretskii
2012-10-16 13:11 ` Stefan Monnier
2012-10-16 17:22 ` Eli Zaretskii
2012-10-16 21:43 ` Stefan Monnier
2012-10-17 4:05 ` Eli Zaretskii
2012-10-17 6:21 ` Stephen J. Turnbull [this message]
2012-10-17 15:50 ` Eli Zaretskii
2012-10-17 17:45 ` Stephen J. Turnbull
2012-10-17 13:34 ` Stefan Monnier
2012-10-17 16:08 ` Eli Zaretskii
2012-10-17 20:23 ` Stefan Monnier
2012-10-17 20:46 ` Eli Zaretskii
2012-10-17 22:08 ` Paul Eggert
2012-10-18 0:22 ` Stefan Monnier
2012-10-18 3:43 ` Stephen J. Turnbull
2012-10-18 4:50 ` Eli Zaretskii
2012-10-18 7:20 ` Paul Eggert
2012-10-18 11:09 ` Eli Zaretskii
2012-10-18 16:42 ` Paul Eggert
2012-10-18 17:21 ` Eli Zaretskii
2012-10-18 8:52 ` Juanma Barranquero
2012-10-18 11:17 ` Eli Zaretskii
2012-10-18 12:33 ` Stefan Monnier
2012-10-18 17:16 ` Eli Zaretskii
2012-10-18 22:09 ` Stefan Monnier
2012-10-19 7:14 ` Eli Zaretskii
2012-10-19 14:44 ` Stefan Monnier
2012-10-19 18:54 ` Eli Zaretskii
2012-10-19 21:35 ` Stefan Monnier
2012-10-19 22:35 ` Eli Zaretskii
2012-10-20 1:52 ` Stefan Monnier
2012-10-20 8:34 ` Eli Zaretskii
2012-10-17 16:05 ` Eli Zaretskii
2012-10-17 16:59 ` Davis Herring
2012-10-17 20:27 ` Stefan Monnier
2012-10-17 21:02 ` Eli Zaretskii
2012-10-18 0:23 ` Stefan Monnier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87r4ox62kr.fsf@uwakimon.sk.tsukuba.ac.jp \
--to=stephen@xemacs.org \
--cc=eliz@gnu.org \
--cc=emacs-devel@gnu.org \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.