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Showing content from https://cplusplus.com/reference/future/packaged_task/reset/ below:

public member function

<future>

Reset task

This allows the stored task to be called again.

The shared state associated to the object before the call (if any) is abandoned (as if the packaged_task was destroyed).

Internally, the function behaves as if move-assigned a newly constructed packaged_task (with its stored task as argument).

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// packaged_task::get_future
#include <iostream>     // std::cout
#include <utility>      // std::move
#include <future>       // std::packaged_task, std::future
#include <thread>       // std::thread

// a simple task:
int triple (int x) { return x*3; }

int main ()
{
  std::packaged_task<int(int)> tsk (triple); // package task

  std::future<int> fut = tsk.get_future();
  tsk(33);
  std::cout << "The triple of 33 is " << fut.get() << ".\n";

  // re-use same task object:
  tsk.reset();
  fut = tsk.get_future();
  std::thread(std::move(tsk),99).detach();
  std::cout << "Thre triple of 99 is " << fut.get() << ".\n";

  return 0;
}

The triple of 33 is 99.
The triple of 99 is 297.

This member function throws an exception on the following conditions:

packaged_task::packaged_task

Construct packaged task (public member function)

packaged_task::operator=

Move-assign packaged_task (public member function)

packaged_task::operator()

Call stored task (public member function)

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