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Use predefined __offsetof__ builtin function when compiling C++ sources.

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This commit is contained in:
Alexander Kabaev 2005-06-03 17:53:36 +00:00
parent 83eb8428e2
commit c5faf12094
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=146941
1 changed files with 7 additions and 0 deletions
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7
sys/sys/cdefs.h
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@ -307,7 +307,14 @@
* We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
* require it.
*/
#ifndef __cplusplus
#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
#else
#define __offsetof(type, field) \
(__offsetof__ (reinterpret_cast <size_t> \
(&reinterpret_cast <const volatile char &> \
(static_cast<type *> (0)->field))))
#endif
#define __rangeof(type, start, end) \
(__offsetof(type, end) - __offsetof(type, start))