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⟩.

Debian                                          September 5, 2008                                    CTASSERT(9)