priority_queue(const Compare& x, const Container& y);
priority_queue(const Compare& x, Container&& y);
template<class InputIterator>
priority_queue(InputIterator first, InputIterator last, const Compare& x, const Container& y);
template<class InputIterator>
priority_queue(InputIterator first, InputIterator last, const Compare& x = Compare(),
Container&& y = Container());