template<class Alloc> explicit priority_queue(const Alloc& a);
template<class Alloc> priority_queue(const Compare& compare, const Alloc& a);
template<class Alloc>
priority_queue(const Compare& compare, const Container& cont, const Alloc& a);
template<class Alloc>
priority_queue(const Compare& compare, Container&& cont, const Alloc& a);
template<class Alloc> priority_queue(const priority_queue& q, const Alloc& a);
template<class Alloc> priority_queue(priority_queue&& q, const Alloc& a);