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28 lines
794 B
C
28 lines
794 B
C
/* threadless.io
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* Copyright (c) 2016 Justin R. Cutler
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* Licensed under the MIT License. See LICENSE file in the project root for
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* full license information.
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*/
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/** @file
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* container_of macro definition
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* @author Justin R. Cutler <justin.r.cutler@gmail.com>
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*/
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#ifndef THREADLESS_CONTAINER_OF_H
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#define THREADLESS_CONTAINER_OF_H
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/* offsetof */
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#include <stddef.h>
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/** Get a pointer to the containing structure of a member
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* @param ptr address of @p member within a @p type
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* @param type type of container
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* @param member name of the member in @p type
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* @returns pointer to containing @p type
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*/
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#define container_of(ptr, type, member) ( \
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(type *)((char *)(1 ? (ptr) : &((type *)0)->member) \
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- offsetof(type, member)) \
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)
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#endif /* THREADLESS_CONTAINER_OF_H */
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