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c94a5688 | 1 | /* The array_length and array_end macros. |
581c785b | 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
c94a5688 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
c94a5688 FW |
18 | |
19 | #ifndef _ARRAY_LENGTH_H | |
20 | #define _ARRAY_LENGTH_H | |
21 | ||
22 | /* array_length (VAR) is the number of elements in the array VAR. VAR | |
23 | must evaluate to an array, not a pointer. */ | |
24 | #define array_length(var) \ | |
8311c83f FW |
25 | (sizeof (var) / sizeof ((var)[0]) \ |
26 | + 0 * sizeof (struct { \ | |
27 | _Static_assert (!__builtin_types_compatible_p \ | |
28 | (__typeof (var), __typeof (&(var)[0])), \ | |
29 | "argument must be an array"); \ | |
30 | })) | |
c94a5688 FW |
31 | |
32 | /* array_end (VAR) is a pointer one past the end of the array VAR. | |
33 | VAR must evaluate to an array, not a pointer. */ | |
34 | #define array_end(var) (&(var)[array_length (var)]) | |
35 | ||
36 | #endif /* _ARRAY_LENGTH_H */ |