[babeltrace.git] / include / babeltrace / compiler.h

#ifndef _BABELTRACE_COMPILER_H
#define _BABELTRACE_COMPILER_H

/*
 * compiler.h
 *
 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#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

#endif /* _BABELTRACE_COMPILER_H */
Commit	Line	Data
d79865b9 MD	1	#ifndef _BABELTRACE_COMPILER_H
	2	#define _BABELTRACE_COMPILER_H
	3
ccd7e1c8 MD	4	/*
	5	* compiler.h
	6	*
	7	* Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* Permission is hereby granted, free of charge, to any person obtaining a copy
	10	* of this software and associated documentation files (the "Software"), to deal
	11	* in the Software without restriction, including without limitation the rights
	12	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	13	* copies of the Software, and to permit persons to whom the Software is
	14	* furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice shall be included in
	17	* all copies or substantial portions of the Software.
	18	*/
	19
334c0a83 MD	20	#include <stddef.h> /* for offsetof */
334c0a83 MD	21
d79865b9 MD	22	#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
d79865b9 MD	23
fc93b2bd MD	24	#ifndef container_of
	25	#define container_of(ptr, type, member) \
	26	({ \
	27	const typeof(((type )NULL)->member) __ptr = (ptr); \
	28	(type )((char )__ptr - offsetof(type, member)); \
	29	})
	30	#endif
	31
d79865b9	32	#endif /* _BABELTRACE_COMPILER_H */