I believe the C++ way would be the right thing for C. Note that this does not mean in any way to inherit all the stuff from C++, nor even constructors and stuff like that. Simply a way to avoid doing this:

    list_add(&mylist,1);

But instead:

    mylist->add(1);

Note that doing this is not an option:

    mylist->class->add(&mylist,1);

It's not just ugly (even if often used), but also uses an additional pointer, which in some application (like Redis) is a no-go because of memory usage.