22 Containers library [containers]

22.6 Container adaptors [container.adaptors]

22.6.5 Class template priority_queue [priority.queue]

22.6.5.5 Specialized algorithms [priqueue.special]

template<class T, class Container, class Compare>
  void swap(priority_queue<T, Container, Compare>& x,
            priority_queue<T, Container, Compare>& y) noexcept(noexcept(x.swap(y)));

Constraints: is_swappable_v<Container> is true and is_swappable_v<Compare> is true.

Effects: As if by x.swap(y).