24 Containers library [containers]

24.6 Container adaptors [container.adaptors]

24.6.7 Class template priority_queue [priority.queue]

24.6.7.5 Specialized algorithms [priqueue.special]

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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)));
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Constraints: is_swappable_v<Container> is true and is_swappable_v<Compare> is true.
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Effects: As if by x.swap(y).