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| author | Eric Wong <e@80x24.org> | 2019-10-06 23:30:41 (GMT) |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2019-10-07 01:20:11 (GMT) |
| commit | 23dee69f53cf5024ca79e0b707dcb03c63f33bef (patch) | |
| tree | e99f2fd2a4e1fe622451eeaafa8c37b40413ec10 /blame.c | |
| parent | c8e424c9c94d97b18cd335be17f32a8ce94a5b7f (diff) | |
| download | git-23dee69f53cf5024ca79e0b707dcb03c63f33bef.zip git-23dee69f53cf5024ca79e0b707dcb03c63f33bef.tar.gz git-23dee69f53cf5024ca79e0b707dcb03c63f33bef.tar.bz2 | |
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 'blame.c')
| -rw-r--r-- | blame.c | 2 |
1 files changed, 0 insertions, 2 deletions
@@ -451,7 +451,6 @@ static int fingerprint_similarity(struct fingerprint *a, struct fingerprint *b) const struct fingerprint_entry *entry_a, *entry_b; hashmap_for_each_entry(&b->map, &iter, entry_b, - const struct fingerprint_entry, entry /* member name */) { entry_a = hashmap_get_entry(&a->map, entry_b, NULL, struct fingerprint_entry, entry); @@ -474,7 +473,6 @@ static void fingerprint_subtract(struct fingerprint *a, struct fingerprint *b) hashmap_iter_init(&b->map, &iter); hashmap_for_each_entry(&b->map, &iter, entry_b, - const struct fingerprint_entry, entry /* member name */) { entry_a = hashmap_get_entry(&a->map, entry_b, NULL, struct fingerprint_entry, entry); |