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hashmap: use *_entry APIs to wrap container_of

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Using `container_of' can be verbose and choosing names for
intermediate "struct hashmap_entry" pointers is a hard problem.
So introduce "*_entry" APIs inspired by similar linked-list
APIs in the Linux kernel.

Unfortunately, `__typeof__' is not portable C, so we need an
extra parameter to specify the type.

Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Wong
2019-10-06 23:30:35 +00:00
committed by Junio C Hamano
parent 6bcbdfb277
commit f0e63c4113
6 changed files with 73 additions and 40 deletions
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15
git-compat-util.h
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@ -1322,4 +1322,19 @@ void unleak_memory(const void *ptr, size_t len);
#define container_of(ptr, type, member) \
((type *) ((char *)(ptr) - offsetof(type, member)))
/*
* helper function for `container_of_or_null' to avoid multiple
* evaluation of @ptr
*/
static inline void *container_of_or_null_offset(void *ptr, size_t offset)
{
return ptr ? (char *)ptr - offset : NULL;
}
/*
* like `container_of', but allows returned value to be NULL
*/
#define container_of_or_null(ptr, type, member) \
(type *)container_of_or_null_offset(ptr, offsetof(type, member))
#endif