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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Sri Ram Vemulpali <sri.ram.gmu06@gmail.com>
Cc: Kernel-newbies <kernelnewbies@nl.linux.org>,
	linux-kernel-mail <linux-kernel@vger.kernel.org>
Subject: Re: typecheck code
Date: Mon, 31 Jan 2011 18:22:57 +0100	[thread overview]
Message-ID: <AANLkTinU9nWTW9nJeGYQ9YJKbSzWn2SK7BjXPx_JZ-0w@mail.gmail.com> (raw)
In-Reply-To: <AANLkTimjz6t9ziPajW1wJdUE8ytWy=FbCr-Zg71PiBgf@mail.gmail.com>

On Mon, Jan 31, 2011 at 18:03, Sri Ram Vemulpali
<sri.ram.gmu06@gmail.com> wrote:
> Hi all,
>
> /*
>  * Check at compile time that something is of a particular type.
>  * Always evaluates to 1 so you may use it easily in comparisons.
>  */
>  #define typecheck(type,x) \
>  ({      type __dummy; \
>        typeof(x) __dummy2; \
>        (void)(&__dummy == &__dummy2); \
>        1; \
>  })
>
> #define typecheck_fn(type,function) \
> ({      typeof(type) __tmp = function; \
>       (void)__tmp; \
> })
>
> Can anyone help me, explain the above code typecheck. How does
> (void)(&__dummy == &__dummy2) evaluates to 1

It does not rely on the equation evaluating to 1. That result is
expicitly unused,
witness the cast to void.
It does rely on gcc complaining if you compare two pointers that don't
point to the same type.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

  parent reply	other threads:[~2011-01-31 17:22 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-31 17:03 Sri Ram Vemulpali
2011-01-31 17:20 ` Jamie Iles
2011-01-31 17:22 ` Geert Uytterhoeven [this message]
2011-01-31 17:44 ` Rajat Sharma
2011-01-31 18:03 ` Manish Katiyar
2011-01-31 20:23   ` Sri Ram Vemulpali
2011-01-31 20:26 ` Dave Hylands
2011-01-31 21:42   ` julie Sullivan

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