deque prime number

hello i have a question i need help using deque
i have an object with my deque i been doing some research i see people do it with bool ,and using sieve of eranthoses method not sure what function to use i try push_back it just doesnt see to work any advice please.



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std::deque<std::uint64_t> object;
return object
What is the meaning of this 2 lines of code?
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