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std::priority_queue::swap

void swap( priority_queue& other );
 (since C++11)

Exchanges the contents of the container adaptor with those of other. Effectively calls using std::swap; swap(c, other.c); swap(comp, other.comp);

Parameters

other - container adaptor to exchange the contents with

Return value

(none).

Exceptions

noexcept specification:
noexcept(noexcept(std::swap(c, other.c)) && noexcept(std::swap(comp, other.comp)))
 (until C++17)
noexcept specification:
noexcept(std::is_nothrow_swappable<Container>::value && std::is_nothrow_swappable<Compare>::value)
 (since C++17)

Complexity

Same as underlying container (typically constant).

See also

 specializes the std::swap algorithm
(function template)

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http://en.cppreference.com/w/cpp/container/priority_queue/swap