diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2011-06-20 16:54:15 +0930 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2011-06-20 11:18:34 +0200 |
commit | 754c677b0bbf3ea6c7d2a73c93848f1b0d68c91e (patch) | |
tree | 54d99c9f66d5a57bf7f70d53e744a31df18f9e0e /lib/ccan/array_size/array_size.h | |
parent | a8c3d38bc806c6972d10b6a371de8941da25a9ae (diff) | |
download | samba-754c677b0bbf3ea6c7d2a73c93848f1b0d68c91e.tar.gz samba-754c677b0bbf3ea6c7d2a73c93848f1b0d68c91e.tar.bz2 samba-754c677b0bbf3ea6c7d2a73c93848f1b0d68c91e.zip |
lib: import ccan modules for tdb2
Imported from git://git.ozlabs.org/~ccan/ccan init-1161-g661d41f
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'lib/ccan/array_size/array_size.h')
-rw-r--r-- | lib/ccan/array_size/array_size.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/ccan/array_size/array_size.h b/lib/ccan/array_size/array_size.h new file mode 100644 index 0000000000..0876945c5e --- /dev/null +++ b/lib/ccan/array_size/array_size.h @@ -0,0 +1,25 @@ +#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 */ |