Date: Fri, 5 Dec 2008 09:44:41 +0100 From: Erik Trulsson <ertr1013@student.uu.se> To: Garrett Cooper <yanefbsd@gmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, Maksim Yevmenkin <maksim.yevmenkin@gmail.com> Subject: Re: RFC: small syscons and kbd patch Message-ID: <20081205084441.GA29312@owl.midgard.homeip.net> In-Reply-To: <7d6fde3d0812050035u6e3ea930o9e093830a8608444@mail.gmail.com> References: <bb4a86c70812021701i621fdcfjb6a58a7f5cf781d5@mail.gmail.com> <7d6fde3d0812040324y3bf0901cy1f4a6d961362c314@mail.gmail.com> <bb4a86c70812040724w43ddec15yab72920d80d879d3@mail.gmail.com> <20081205072229.GE18652@hoeg.nl> <7d6fde3d0812050034y43a70ce8i49fbba92f9c8943b@mail.gmail.com> <7d6fde3d0812050035u6e3ea930o9e093830a8608444@mail.gmail.com>
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On Fri, Dec 05, 2008 at 12:35:31AM -0800, Garrett Cooper wrote:
> On Thu, Dec 4, 2008 at 11:22 PM, Ed Schouten <ed@80386.nl> wrote:
> > * Maksim Yevmenkin <maksim.yevmenkin@gmail.com> wrote:
> >> the idea was to ensure that kbd->kb_locked variable only takes values
> >> 0 (zero) and 1 (one).
> >
> > I often use constructs like these to do that:
> >
> > foo = bar ? 1 : 0;
> >
> > Maybe !!bar is a lot shorter to write, I think the line above is a lot
> > easier to read.
>
> Indeed. I had no idea (and I would assume that many people wouldn't in
> my similar level of systems programming) what in the work you were
> trying to do above with that line. The one-line conditional is
> universal in almost all major high-level language dialects I've hit,
> minus Python and Tcl.
> -Garrett
The !!bar construction to map {0, not-0} to {0,1} is fairly common in C
programming, and I would certainly expect any experienced C programmer to
recognize it.
--
<Insert your favourite quote here.>
Erik Trulsson
ertr1013@student.uu.se
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