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| author |  Eric Wong <e@80x24.org> | 2019-10-06 23:30:41 +0000 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2019-10-07 10:20:11 +0900 |
| commit | 23dee69f53cf5024ca79e0b707dcb03c63f33bef (patch) | |
| tree | e99f2fd2a4e1fe622451eeaafa8c37b40413ec10 /trace2 | |
| parent | hashmap: introduce hashmap_free_entries (diff) | |
| download | tgif-23dee69f53cf5024ca79e0b707dcb03c63f33bef.tar.xz | |
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 'trace2')
0 files changed, 0 insertions, 0 deletions