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Add CONST_CONTAINER_OF for const pointers

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Nils O. Selåsdal
2013-06-10 22:55:30 +02:00
parent d1eded3f9d
commit eba7590e6c
1 changed files with 6 additions and 1 deletions
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include/ucore/utils.h
+6 -1
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@@ -48,7 +48,12 @@
//struct foo *f = CONTAINER_OF(p, struct foo, zap);
#define CONTAINER_OF(ptr, type, member) ({ \
typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (void *)__mptr - offsetof(type, member) ); })
(type *)( (unsigned char *)__mptr - offsetof(type, member) ); })
//Same as CONTAINER_OF, but for a const pointer to avoid gcc warnings..
#define CONST_CONTAINER_OF(ptr, type, member) ({ \
const typeof( ((const type *)0)->member ) *__mptr = (ptr); \
(const type *)( (const unsigned char *)__mptr - offsetof(const type, member) ); })
/** Align a value.
* @param val value to align