1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef TYPECHECK_H_INCLUDED
3 #define TYPECHECK_H_INCLUDED
4 
5 /*
6  * Check at compile time that something is of a particular type.
7  * Always evaluates to 1 so you may use it easily in comparisons.
8  */
9 #define typecheck(type,x) \
10 ({	type __dummy; \
11 	typeof(x) __dummy2; \
12 	(void)(&__dummy == &__dummy2); \
13 	1; \
14 })
15 
16 /*
17  * Check at compile time that 'function' is a certain type, or is a pointer
18  * to that type (needs to use typedef for the function type.)
19  */
20 #define typecheck_fn(type,function) \
21 ({	typeof(type) __tmp = function; \
22 	(void)__tmp; \
23 })
24 
25 /*
26  * Check at compile time that something is a pointer type.
27  */
28 #define typecheck_pointer(x) \
29 ({	typeof(x) __dummy; \
30 	(void)sizeof(*__dummy); \
31 	1; \
32 })
33 
34 #endif		/* TYPECHECK_H_INCLUDED */
35