ctassert(9) [netbsd man page]

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

NAME

     CTASSERT -- compile time assertion macro

SYNOPSIS

     void
     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
								 January 24, 2010							       BSD

ASSERT(3)						   BSD Library Functions Manual 						 ASSERT(3)

NAME

     assert -- expression verification macro

SYNOPSIS

     #include <assert.h>

     assert(expression);

DESCRIPTION

     The assert() macro tests the given expression and if it is false, the calling process is terminated.  A diagnostic message, consisting of the
     text of the expression, the name of the source file, the line number and the enclosing function, is written to stderr and the abort(3) func-
     tion is called, effectively terminating the program.

     If expression is true, the assert() macro does nothing.

     The assert() macro may be removed at compile time with the cc(1) option -DNDEBUG.

DIAGNOSTICS

     The following diagnostic message is written to stderr if expression is false:

	   "assertion "%s" failed: file "%s", line %d, function "%s"
", 
			       "expression", __FILE__, __LINE__, __func__);

SEE ALSO

     cc(1), _DIAGASSERT(3), abort(3)

STANDARDS

     The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY

     A assert macro appeared in Version 6 AT&T UNIX.

     Information on the name of the enclosing function appeared in ISO/IEC 9899:1999 (``ISO C99'').

BSD
								 January 22, 2007							       BSD