From: David Brown <david@westcontrol.com>
To: mathog <mathog@caltech.edu>
Cc: gcc@gcc.gnu.org
Subject: Re: [bool wrapping] Request for warnings on implicit bool to int conversions
Date: Thu, 29 Mar 2012 10:29:00 -0000 [thread overview]
Message-ID: <4F743777.6040409@westcontrol.com> (raw)
In-Reply-To: <b0e87afec2593121c5c332b84fabf1f4@saf.bio.caltech.edu>
On 29/03/2012 00:52, mathog wrote:
> On 28-Mar-2012 15:20, Michael Witten wrote:
>
>> However, it seems to me that toggling the value with the idiom:
>>
>> --b;
>>
>> is aesthetically preferable to the more elaborate:
>>
>> b = !b;
>
> Aesthetically, not logically. Neither of these makes the least bit of
> sense:
>
> one less than False
> one less than True
>
> A better solution for the aesthetics would have been (it is a bit late
> now) to implement the missing unary negation operator:
>
> !!b; //T->F, F->T
>
You can't do that, because "!!" is already a useful operator on integers
- it turns anything non-zero into 1 while leaving 0 alone, and is
effectively an "int to bool" conversion operator.
> That operator would save even more program characters for the other int
> types, where it would be equivalent to:
>
> (i==0 ? 1 : 0);
>
>
> Regards,
>
> David Mathog
> mathog@caltech.edu
> Manager, Sequence Analysis Facility, Biology Division, Caltech
>
next prev parent reply other threads:[~2012-03-29 10:29 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 22:43 mathog
2012-03-28 1:00 ` Paolo Carlini
2012-03-28 1:19 ` Gabriel Dos Reis
2012-03-28 2:21 ` Russ Allbery
2012-03-28 2:30 ` Gabriel Dos Reis
2012-03-28 2:40 ` Russ Allbery
2012-03-28 2:48 ` Russ Allbery
2012-03-28 19:32 ` [bool wrapping] " Michael Witten
2012-03-28 20:30 ` mathog
2012-03-28 22:21 ` Michael Witten
2012-03-28 22:52 ` mathog
2012-03-29 10:29 ` David Brown [this message]
2012-03-29 17:49 ` mathog
2012-03-28 22:28 ` Michael Witten
2012-03-28 9:00 ` Franz Sirl
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=4F743777.6040409@westcontrol.com \
--to=david@westcontrol.com \
--cc=gcc@gcc.gnu.org \
--cc=mathog@caltech.edu \
/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).