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)));
Remarks: This function shall not participate in overload resolution unless is_swappable_v<Container> is true and is_swappable_v<Compare> is true.
Effects: As if by x.swap(y).