std::packaged_task<R(Args...)>::swap - cppreference.com
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    std::packaged_task<R(Args...)>::swap

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    std::packaged_task
     
    void swap( packaged_task& other ) noexcept;
    		(since C++11)

    Exchanges the shared states and stored tasks of *this and other.

    Parameters

    other - packaged task whose state to swap with

    Return value

    (none)

    See also