From: Drew Adams <drew.adams@oracle.com>
To: "Andreas Röhler" <andreas.roehler@easy-emacs.de>,
"Help Gnu Emacs mailing list" <help-gnu-emacs@gnu.org>
Subject: RE: (copy-marker nil)
Date: Mon, 7 May 2018 07:26:39 -0700 (PDT) [thread overview]
Message-ID: <0cc6f5df-d980-492c-a6f3-86070a73488c@default> (raw)
In-Reply-To: <1e55da6a-d791-c613-ac9a-5d9bc57f840f@easy-emacs.de>
> > For most functions, passing nil for an &optional parameter is the same
> > as omitting it.
> > If MARKER is not specified, the new marker does not point anywhere.
>
> It's about the return value.
> A marker pointing nowhere, might it be considered valid?
What do you mean by "valid"? Yes, it's a marker. No, it
doesn't have a buffer or position. The same is true of
other Emacs-Lisp objects, such as overlays: they can exist
without having non-nil values for certain of their properties.
> Expected such returning nil.
Why? The doc string is pretty clear that it returns a
marker. And it is clear what happens if arg MARKER is
nil: "the new marker does not point anywhere".
next prev parent reply other threads:[~2018-05-07 14:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 8:19 (copy-marker nil) Andreas Röhler
2018-05-07 13:39 ` John Mastro
2018-05-07 14:23 ` Andreas Röhler
2018-05-07 13:55 ` Noam Postavsky
2018-05-07 14:20 ` Andreas Röhler
2018-05-07 14:26 ` Drew Adams [this message]
2018-05-07 17:16 ` Andreas Röhler
2018-05-08 1:46 ` Stefan Monnier
2018-05-08 8:44 ` Andreas Röhler
2018-05-12 22:06 ` 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=0cc6f5df-d980-492c-a6f3-86070a73488c@default \
--to=drew.adams@oracle.com \
--cc=andreas.roehler@easy-emacs.de \
--cc=help-gnu-emacs@gnu.org \
/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.