Showing content from https://cplusplus.com/reference/future/packaged_task/swap/ below:
public member function
<future>
std::packaged_task::swap
void swap (packaged_task& x) noexcept;
Swap packaged_task
Exchanges the shared state and stored task with x .
Parameters
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x
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Another packaged_task object of the same type (with the same template parameters, Ret and Args...).
Return value none
Data races Both x and the object are modified.
Exception safetyNo-throw guarantee: never throws exceptions.
See also
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packaged_task::operator=
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Move-assign packaged_task (public member function)
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packaged_task::packaged_task
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Construct packaged task (public member function)
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