Is packaged task not in thread

Question

Hi

Does package task not executed in different thread?

Is it possible to get it executed in separate thread ?
https://sololearn.com/compiler-playground/cktXscBZYYAn/?ref=app

Answer 1

like this?

#include <iostream>
#include <future>
#include <thread>

int getValue(int n)
{
std::cout << "from getValue: " << std::this_thread::get_id() << '\n' << n <<'\n';

return n;
}

int main()
{
std::packaged_task<int(int)> pg(getValue);
std::thread t1(move(pg), 11);
t1.join();

std::packaged_task<int(int)> pg2(getValue);
pg2(12);
std::future<int> f = pg2.get_future();
std::cout << "from main: "
<< std::this_thread::get_id()
<< '\n' << f.get() << '\n';

}

related articles:
https://stackoverflow.com/questions/20306335/c11-packaged-task-running-with-its-own-thread-need-a-join-in-order-to-get-fu

https://dev.to/clightning/good-bad-ugly-in-concurrent-programming-with-c-30ke#:~:text=The%20std%3A%3Apackaged_task%20is,the%20execution%20of%20the%20task.

https://stackoverflow.com/questions/18143661/what-is-the-difference-between-packaged-task-and-async

Answer 2

Thanks Bob_Li

Answer 3

I wrongly assumed that packaged task is always a different thread