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⟩.