[babeltrace.git] / src / compat / compiler.h

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _BABELTRACE_COMPILER_H
#define _BABELTRACE_COMPILER_H

#include <stddef.h>	/* for offsetof */

#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))

#ifndef container_of
#define container_of(ptr, type, member)					\
	({								\
		const __typeof__(((type *)NULL)->member) * __ptr = (ptr);	\
		(type *)((char *)__ptr - offsetof(type, member));	\
	})
#endif

#define BT_ARRAY_SIZE(arr)	(sizeof(arr) / sizeof((arr)[0]))

#endif /* _BABELTRACE_COMPILER_H */
Commit	Line	Data
ccd7e1c8	1	/*
0235b0db	2	* SPDX-License-Identifier: MIT
ccd7e1c8	3	*
0235b0db	4	* Copyright 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
ccd7e1c8 MD	5	*/
ccd7e1c8 MD	6
0235b0db MJ	7	#ifndef _BABELTRACE_COMPILER_H
	8	#define _BABELTRACE_COMPILER_H
	9
334c0a83 MD	10	#include <stddef.h> /* for offsetof */
334c0a83 MD	11
d79865b9 MD	12	#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
d79865b9 MD	13
fc93b2bd MD	14	#ifndef container_of
	15	#define container_of(ptr, type, member) \
	16	({ \
0ec1ae8b	17	const __typeof__(((type )NULL)->member) __ptr = (ptr); \
fc93b2bd MD	18	(type )((char )__ptr - offsetof(type, member)); \
	19	})
	20	#endif
	21
6e1bc0df MD	22	#define BT_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
6e1bc0df MD	23
d79865b9	24	#endif /* _BABELTRACE_COMPILER_H */