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/* Licensed under LGPLv2.1+ - 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 */
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