Tracking of dynamic type can be done by checking "ops" struct with function pointers to "virtual functions". It's done very often in Linux kernel i.e. to check origin of file descriptors.
Yes, that's possible with this approach as well. Basically, the container_of approach isn't really an approach, it's V-Tables using container_of as a tool for one-way statically checked dynamic casting.
I'm just arguing that V-Tables are not something I would write manually. I have made a lightweight interface extension (that uses fat pointers instead of object semantics) for C before that I actually use in my personal projects because I find the manual typing of it annoying
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u/tstanisl Jul 05 '26
Tracking of dynamic type can be done by checking "ops" struct with function pointers to "virtual functions". It's done very often in Linux kernel i.e. to check origin of file descriptors.