[ edit ] Parameters

(none)

[ edit ] Return value

(none)

[ edit ] Exceptions

• std::future_error if * this has no shared state. The error condition is set to no_state .
• std::bad_alloc if there was not enough memory for a new shared state.
• Any exception thrown by the move constructor of the new packaged_task .

  [ edit ] Example

  Run this code

  #include <cmath>
  #include <future>
  #include <iostream>
  #include <thread>
  int main()
      std::packaged_task<int(int,int)> task([](int a, int b)
          return std::pow(a, b);
      });
      std::future<int> result = task.get_future();
      task(2, 9);
      std::cout << "2^9 = " << result.get() << '\n';
      task.reset();
      result = task.get_future();
      std::thread task_td(std::move(task), 2, 10);
      task_td.join();
      std::cout << "2^10 = " << result.get() << '\n';
  Output:
  2^9 = 512
  2^10 = 1024
   
              
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