Hello, While I was replacing an std::unordered_set with a tbb::concurrent_unordered_set, it occurs to me that Key need to be DefaultConstructible for tbb, while std doesn't require it. Is it normal? Maybe I missed something in the documentation, but I don't want my type to be DefaultConstructible (and it would be very cumbersome to change this). In the meantime, I tried with aconcurrent_hash_map, which doesn't seem to require Key to be DefaultConstructible. Besides thread-safe erasing, are there any difference between those two containers? Thanks!
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