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 | |