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

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Message-ID: <7b69d1470612150652p609c38d2n9bff58bdb0a1edb7@mail.gmail.com>
Date:	Fri, 15 Dec 2006 08:52:22 -0600
From:	"Scott Preece" <sepreece@...il.com>
To:	"Pavel Machek" <pavel@....cz>
Cc:	"Stefan Richter" <stefanr@...6.in-berlin.de>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>, jesper.juhl@...il.com,
	akpm <akpm@...l.org>
Subject: Re: [PATCH/v2] CodingStyle updates

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...

scott
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