The question of intrusive containers is kind of orthogonal. You can implement intrusive containers using generics. Aslo, kernel code would use intrusive contain

The question of intrusive containers is kind of orthogonal. You can implement intrusive containers using generics. Aslo, kernel code would use intrusive containers even if there were easy-to-user non-intrusives available directly in C. The reason, of course, being that with intrusive containers you can avoid huge amount of memory allocations.