Thanks to visit codestin.com
Credit goes to cplusplus.com

C++

Reference

<future>

packaged_task

function template
<future>

std::swap (packaged_task)

template <class Ret, class... Args>  void swap (packaged_task<Ret(Args...)>& x, packaged_task<Ret(args...)>& y) noexcept;
Swap packaged_task
Exchanges the shared states and stored tasks between x and y.

This is an overload of swap that behaves as if x.swap(y) was called.

Parameters

x,y
packaged_task objects of the same type (with the same template parameters).

Return value

none

Data races

Both objects, x and y, are modified.

Exception safety

No-throw guarantee: never throws exceptions.

See also

packaged_task::swap
Swap packaged_task (public member function)
packaged_task::operator=
Move-assign packaged_task (public member function)
swap
Exchange values of two objects (function template)