It's not entirely clear why TBB requires this. I couldn't find this restriction in their documentation yet. It is mentioned in a code comment in `allocate_node_default_construct` in `tbb/concurrent_hash_map.h` though.
It's not entirely clear why TBB requires this. I couldn't find this restriction in their documentation yet. It is mentioned in a code comment in `allocate_node_default_construct` in `tbb/concurrent_hash_map.h` though.