path: root/hashmap.c
diff options
authorEric Wong <>2019-10-06 23:30:41 (GMT)
committerJunio C Hamano <>2019-10-07 01:20:11 (GMT)
commit23dee69f53cf5024ca79e0b707dcb03c63f33bef (patch)
treee99f2fd2a4e1fe622451eeaafa8c37b40413ec10 /hashmap.c
parentc8e424c9c94d97b18cd335be17f32a8ce94a5b7f (diff)
OFFSETOF_VAR macro to simplify hashmap iterators
While we cannot rely on a `__typeof__' operator being portable to use with `offsetof'; we can calculate the pointer offset using an existing pointer and the address of a member using pointer arithmetic for compilers without `__typeof__'. This allows us to simplify usage of hashmap iterator macros by not having to specify a type when a pointer of that type is already given. In the future, list iterator macros (e.g. list_for_each_entry) may also be implemented using OFFSETOF_VAR to save hackers the trouble of using container_of/list_entry macros and without relying on non-portable `__typeof__'. v3: use `__typeof__' to avoid clang warnings Signed-off-by: Eric Wong <> Reviewed-by: Derrick Stolee <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'hashmap.c')
0 files changed, 0 insertions, 0 deletions