lib: Add functions to borrow specialized component classes from specialized components
[babeltrace.git] / include / babeltrace / compiler-internal.h
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1#ifndef _BABELTRACE_COMPILER_H
2#define _BABELTRACE_COMPILER_H
3
ccd7e1c8 4/*
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5 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
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24 */
25
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26#include <stddef.h> /* for offsetof */
27
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28#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
29
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30#ifndef container_of
31#define container_of(ptr, type, member) \
32 ({ \
33 const typeof(((type *)NULL)->member) * __ptr = (ptr); \
34 (type *)((char *)__ptr - offsetof(type, member)); \
35 })
36#endif
37
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38#define BT_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
39
d79865b9 40#endif /* _BABELTRACE_COMPILER_H */
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