From: "B.V. Raghav" <bvraghav@iitk.ac.in>
To: Alan Mackenzie <acm@muc.de>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Skeleton angle brackets '<' and '>'
Date: Thu, 07 Jan 2016 09:33:49 +0530 [thread overview]
Message-ID: <8737uaxcgq.fsf@think.bvr.lan> (raw)
In-Reply-To: <n6jkmb$hmt$1@colin.muc.de> (Alan Mackenzie's message of "Wed, 6 Jan 2016 17:59:39 +0000 (UTC)")
Hi Alan,
Alan Mackenzie <acm@muc.de> writes:
>
> Be careful what you want! Do you also want automatically to pair up
> "less than" with "greater than"? It could get pretty tedious if, every
> time you wanted to write "i < 10", you got "i <>", forcing you to delete
> the ">" before writing in the "10".
>
> This overloading of < and > with two meanings (actually, three when you
> count "#include <stdio.h>", but that causes few problems) causes great
> difficulties for C++ Mode. Only after extensive analysis can the mode
> determine that a < and a > are a pair of template delimiters, and even
> then, can't do it with 100% certainty.
>
> For example, how many parameters are passed to foo in the following:
>
> foo (a < b, c > d);
>
> ? It might be a function call with two relational expressions, it might
> be a declaration with the single parameter d of templated type a <b , c>.
> Such was the wisdom of C++'s designers.
>
> When it is determined there is a pair of delimiters, they are marked as
> such with syntax-table text properties, but this marking is always done
> on both delimiters at once.
>
> In short, there is little chance of ever being able to insert angle
> brackets as a pair in C++ Mode. Sorry!
Oh my, my! I totally forgot about the relational operator part! And the
elaborate explanation was highly insightful---a brilliant recap of the
C++ basics.
Thanks,
r
--
(B.V. Raghav)
next prev parent reply other threads:[~2016-01-07 4:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1800.1452028390.843.help-gnu-emacs@gnu.org>
2016-01-06 17:59 ` Skeleton angle brackets '<' and '>' Alan Mackenzie
2016-01-07 4:03 ` B.V. Raghav [this message]
2016-01-07 9:07 ` Yuri Khan
2016-01-08 18:33 ` B.V. Raghav
2016-01-05 21:12 B.V. Raghav
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
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8737uaxcgq.fsf@think.bvr.lan \
--to=bvraghav@iitk.ac.in \
--cc=acm@muc.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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).