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⟩.