| /* CC0 (Public domain) - see LICENSE file for details */ |
| #ifndef CCAN_ARRAY_SIZE_H |
| #define CCAN_ARRAY_SIZE_H |
| #include "config.h" |
| #include <ccan/build_assert/build_assert.h> |
| |
| /** |
| * ARRAY_SIZE - get the number of elements in a visible array |
| * @arr: the array whose size you want. |
| * |
| * This does not work on pointers, or arrays declared as [], or |
| * function parameters. With correct compiler support, such usage |
| * will cause a build error (see build_assert). |
| */ |
| #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr)) |
| |
| #if HAVE_BUILTIN_TYPES_COMPATIBLE_P && HAVE_TYPEOF |
| /* Two gcc extensions. |
| * &a[0] degrades to a pointer: a different type from an array */ |
| #define _array_size_chk(arr) \ |
| BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(arr), \ |
| typeof(&(arr)[0]))) |
| #else |
| #define _array_size_chk(arr) 0 |
| #endif |
| #endif /* CCAN_ALIGNOF_H */ |
