CTASSERT.9 revision 182791
Copyright (c) 2003 Hiten M. Pandya
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$FreeBSD: head/share/man/man9/CTASSERT.9 182791 2008-09-05 15:24:54Z emaste $
.Dd September 5, 2008 .Os .Dt CTASSERT 9 .Sh NAME .Nm CTASSERT .Nd compile time assertion macro .Sh SYNOPSIS n sys/param.h n sys/systm.h .Fn CTASSERT expression .Sh DESCRIPTION The .Fn CTASSERT macro evaluates .Fa expression at compile time and causes a compiler error if it is false.
All rights reserved.
This program is free software.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$FreeBSD: head/share/man/man9/CTASSERT.9 182791 2008-09-05 15:24:54Z emaste $
.Dd September 5, 2008 .Os .Dt CTASSERT 9 .Sh NAME .Nm CTASSERT .Nd compile time assertion macro .Sh SYNOPSIS n sys/param.h n sys/systm.h .Fn CTASSERT expression .Sh DESCRIPTION The .Fn CTASSERT macro evaluates .Fa expression at compile time and causes a compiler error if it is false.
p The .Fn CTASSERT macro is useful for asserting the size or alignment of important data structures and variables during compilation, which would otherwise cause the code to fail at run time. .Sh IMPLEMENTATION NOTES The .Fn CTASSERT macro should not be used in a header file. It is implemented using a dummy typedef, with a name (based on line number) that may conflict with a .Fn CTASSERT in a source file including that header. .Sh EXAMPLES Assert that the size of the .Vt uuid structure is 16 bytes.
p .Dl "CTASSERT(sizeof(struct uuid) == 16);" .Sh SEE ALSO .Xr KASSERT 9 .Sh AUTHORS This manual page was written by .An Hiten M. Pandya .Aq hmp@FreeBSD.org .