You can put nodes in a Slab or a SlotMap, use keys/indexes for your next pointers, and create multiple interacting (possibly overlapping) lists that way. You ha

You can put nodes in a Slab or a SlotMap, use keys/indexes for your next pointers, and create multiple interacting (possibly overlapping) lists that way. You have to be careful not to combine nodes from different collections, but that's also sort of true with memory allocators.