[obl]

This is memory safe if you never re-use a (generational index, address) pair.

They seem to use 64 bit ones so this means that to overflow a single memory cell you would have to allocate and free it every cycle (!) at 4 ghz for about 150 years.

Basically as long as you accept this incredibly small "memory leak" you're fine.

[imtringued]

By memory leak you mean that every memory location has a limited number of alloc+free and once it passes that, the memory is unusable?

Maybe you should have said, "to overflow the generational index you would have to exclusively allocate and free it with no work being performed for 150 years. Once the overflow happens the only consequence is that this memory cell will never be allocated again."