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authorEric Wong <e@80x24.org>2019-10-06 23:30:41 (GMT)
committerJunio C Hamano <gitster@pobox.com>2019-10-07 01:20:11 (GMT)
commit23dee69f53cf5024ca79e0b707dcb03c63f33bef (patch)
treee99f2fd2a4e1fe622451eeaafa8c37b40413ec10 /attr.c
parentc8e424c9c94d97b18cd335be17f32a8ce94a5b7f (diff)
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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 <e@80x24.org> Reviewed-by: Derrick Stolee <stolee@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'attr.c')
-rw-r--r--attr.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/attr.c b/attr.c
index ca8be46..9849106 100644
--- a/attr.c
+++ b/attr.c
@@ -168,7 +168,6 @@ static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check)
check->all_attrs_nr = size;
hashmap_for_each_entry(&map->map, &iter, e,
- struct attr_hash_entry,
ent /* member name */) {
const struct git_attr *a = e->value;
check->all_attrs[a->attr_nr].attr = a;