deque prime number

[ghost1111]

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.

std::deque<std::uint64_t> object;
return object

[coder777]

What is the meaning of this 2 lines of code?