container_of.h

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/*  container_of.h
 *
 *  Copyright (C) 2023 abxh
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *  See the file LICENSE included with this distribution for more
 *  information. */
 
#pragma once
 
#ifndef container_of
#define container_of(ptr, type, member)                    \
    __extension__({                                        \
        const typeof(((type *)0)->member) *__mptr = (ptr); \
        (type *)((char *)__mptr - offsetof(type, member)); \
    })
#endif