How to preallocate(reserve) a priority_queue?

Question

How can I preallocate a std::priority_queue with a container of type std::vector?

std::priority_queue

        

Answer 1

Yes, there's a constructor for that. It's slightly tedious that you also have to specify a comparator:

std::vector container;
container.reserve(1024);
std::priority_queue> pq (
    std::less(), std::move(container));

You can also use evil shenanigans to access the protected member, but I wouldn't recommend it.