linux-kernel - Re: [PATCH/v2] CodingStyle updates

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Message-ID: <20061215150717.GA2345@elf.ucw.cz>
Date:	Fri, 15 Dec 2006 16:07:17 +0100
From:	Pavel Machek <pavel@....cz>
To:	Scott Preece <sepreece@...il.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/v2] CodingStyle updates

On Fri 2006-12-15 08:52:22, Scott Preece wrote:
> On 12/15/06, Pavel Machek <pavel@....cz> wrote:
> >Hi!
> >
> >> Pavel Machek wrote:
> >> >> From: Randy Dunlap <randy.dunlap@...cle.com>
> >> >> +Use one space around (on each side of) most binary and ternary 
> >operators,
> >> >> +such as any of these:
> >> >> +  =  +  -  <  >  *  /  %  |  &  ^  <=  >=  ==  !=  ?  :
> >> >
> >> > Actually, this should not be hard rule. We want to allow
> >> >
> >> >     j = 3*i + l<<2;
> >>
> >> Which would be very misleading. This expression evaluates to
> >>
> >>       j = (((3 * i) + l) << 2);
> >>
> >> Binary + precedes <<.
> >
> >Aha, okay. So this one should be written as
> >
> >        j = 3*i+l << 2;
> >
> >(Well, parenthesses should really be used. Anyway, sometimes grouping
> >around operator is useful, even if I made mistake demonstrating that.
> ---
> 
> I think the mistake illuminates why parentheses should be the rule. If
> you're thinking about using spacing to convey grouping, use
> parentheses instead...

Not in simple cases.

	3*i + 2*j should be writen like that. Not like
	(3 * i) + (2 * j)

								Pavel


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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