src/compat/compiler.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _BABELTRACE_COMPILER_H
   8 #define _BABELTRACE_COMPILER_H
   9
  10 #include <stddef.h>     /* for offsetof */
  11
  12 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
  13
  14 #ifndef container_of
  15 #define container_of(ptr, type, member)                                 \
  16         ({                                                              \
  17                 const __typeof__(((type *)NULL)->member) * __ptr = (ptr);       \
  18                 (type *)((char *)__ptr - offsetof(type, member));       \
  19         })
  20 #endif
  21
  22 #define BT_ARRAY_SIZE(arr)      (sizeof(arr) / sizeof((arr)[0]))
  23
  24 #endif /* _BABELTRACE_COMPILER_H */