/**

 * @file contain.h

 * @brief Implements pseudo object oriented features.

 * @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#ifndef HAVE_CONTAIN_H

#define HAVE_CONTAIN_H

#include <stddef.h>

/*

 * This macro borrowed from the Linux kernel.

 */

#define container_of(ptr, type, member) ({			\

	const typeof( ((type *)0)->member ) *__mptr = (ptr);	\

	(type *)( (char *)__mptr - offsetof(type, member) );	\

})

#endif