From: Glynn Clements <glynn@gclements.plus.com>
To: "Robert P. J. Day" <rpjday@mindspring.com>
Cc: C programming list <linux-c-programming@vger.kernel.org>
Subject: Re: using compile-time "assertions"
Date: Mon, 6 Jun 2005 02:08:46 +0100 [thread overview]
Message-ID: <17059.41502.432000.929857@gargle.gargle.HOWL> (raw)
In-Reply-To: <Pine.LNX.4.61.0506051632530.5573@localhost.localdomain>
Robert P. J. Day wrote:
> another question (one of undoubtedly many) regarding the code i
> inherited. in this code, there is liberal use of the following macro:
>
> #define INVARIANT(e) \
> do { \
> struct whatever { char static_assertion[(e) ? 1 : -1]; }; \
> } while (0)
>
> which i recognize as a *compile-time* assertion/invariant. is this a
> common construct? just curious. or is there a more popular variant
> of this sort of thing? i recognize its value but, geez, there's
> hundreds of these things in the code. :-P
I've never seen that one before. It's more common to just use e.g.:
#if !expression
#error expression
#endif
--
Glynn Clements <glynn@gclements.plus.com>
next prev parent reply other threads:[~2005-06-06 1:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-05 20:36 using compile-time "assertions" Robert P. J. Day
2005-06-06 1:08 ` Glynn Clements [this message]
2005-06-06 21:01 ` Robert P. J. Day
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