[vlc-commits] Add container_of() convenience wrapper for offsetof()

[Rémi Denis-Courmont]

vlc | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Wed Jun  7 23:02:30 2017 +0300| [b7933615fa00bb4c9b48126c6536c2ca6794c286] | committer: Rémi Denis-Courmont

Add container_of() convenience wrapper for offsetof()

(Name comes Linux kernel. Implementation is from scratch.)

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=b7933615fa00bb4c9b48126c6536c2ca6794c286
---

 include/vlc_common.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/vlc_common.h b/include/vlc_common.h
index a3663accdd..e1cf885379 100644
--- a/include/vlc_common.h
+++ b/include/vlc_common.h
@@ -842,6 +842,9 @@ typedef struct {
 
 VLC_API bool vlc_ureduce( unsigned *, unsigned *, uint64_t, uint64_t, uint64_t );
 
+#define container_of(ptr, type, member) \
+    ((type *)(((char *)(ptr)) - offsetof(type, member)))
+
 /* Aligned memory allocator */
 
 #ifdef __MINGW32__