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Re: [PATCH]: Fix PR tree-optimization/21407


On Fri, May 13, 2005 at 10:35:00AM +0200, Kai Henningsen wrote:
> And so does the Linux kernel, though I don't have a snippet handy.  
> Embedding structs and recovering the outer from the inner using offsetof  
> is an important part of the basic design.

/*
 * container_of - cast a member of a structure out to the containing structure
 *
 * @ptr:        the pointer to the member.
 * @type:       the type of the container struct this is embedded in.
 * @member:     the name of the member within the struct.
 *
 */
#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
	(type *)( (char *)__mptr - offsetof(type,member) );})

most prominently used in the linked list implementation


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