freebsd man page for ctassert

CTASSERT(9)						   BSD Kernel Developer's Manual					       CTASSERT(9)

NAME
     CTASSERT -- compile time assertion macro

SYNOPSIS
     #include <sys/param.h>
     #include <sys/systm.h>

     CTASSERT(expression);

DESCRIPTION
     The CTASSERT() macro evaluates expression at compile time and causes a compiler error if it is false.

     The 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.

IMPLEMENTATION NOTES
     The 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 CTASSERT() in a source file including that header.

EXAMPLES
     Assert that the size of the uuid structure is 16 bytes.

	   CTASSERT(sizeof(struct uuid) == 16);

SEE ALSO
     KASSERT(9)

AUTHORS
     This manual page was written by Hiten M. Pandya <hmp@FreeBSD.org>.

BSD
								 September 5, 2008							       BSD