From: Keith David Bershatsky <esq@lawlist.com>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: emacs-devel@gnu.org
Subject: Re: How to quickly compare equality of structs ...
Date: Mon, 06 May 2019 16:07:04 -0700 [thread overview]
Message-ID: <m2r29b18tj.wl%esq@lawlist.com> (raw)
Thank you, Paul, for the suggestions.
This afternoon, I came across the Cantor's Pairing Function that can be used to create a unique ID for each fake cursor. With that unique ID, I can limit the quantity of comparisons ....
n = ((x + y)*(x + y + 1)/2) + y
I'll keep working the outline/plan ...
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> Date: [05-06-2019 14:22:37] <6 May 2019 14:22:37 -0700>
> From: Paul Eggert <eggert@cs.ucla.edu>
> To: Keith David Bershatsky <esq@lawlist.com>
> Cc: emacs-devel@gnu.org
> Subject: Re: How to quickly compare equality of structs ...
>
> On 5/6/19 1:40 PM, Keith David Bershatsky wrote:
> > C provides no method for comparing equality of structs
>
> You can compare each member of the struct yourself. Or you can use
> memset to clear all the bytes in the struct (including padding bytes)
> before initializing the struct members, and then use memcmp on the result.
>
> > Based on my limited experience with hash tables in Lisp, I am unable to visualize how I could use such a table in C to do my comparison for each fake cursor ....
>
> I'm sure there's a way.
next reply other threads:[~2019-05-06 23:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 23:07 Keith David Bershatsky [this message]
2019-05-07 0:49 ` How to quickly compare equality of structs Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2019-05-07 2:59 Keith David Bershatsky
2019-05-07 12:41 ` Stefan Monnier
2019-05-06 20:40 Keith David Bershatsky
2019-05-06 21:22 ` Paul Eggert
2019-05-06 18:55 Keith David Bershatsky
2019-05-06 19:00 ` Paul Eggert
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=m2r29b18tj.wl%esq@lawlist.com \
--to=esq@lawlist.com \
--cc=eggert@cs.ucla.edu \
--cc=emacs-devel@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 public inbox
https://git.savannah.gnu.org/cgit/emacs.git
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).