CTASSERT9
Compile time assertion macro
Usage
#include <sys/param.h>
#include <sys/systm.h>
CTASSERT(expression);
Overview
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.
Examples
Assert that the size of the uuid structure is 16 bytes.
CTASSERT(sizeof(struct uuid) == 16);