#include <chrono>
#include <iostream>
#include <thread>

void foo()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
}

void bar()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
}

int main()
{
    std::jthread t1(foo);
    std::jthread t2(bar);

    std::cout << "thread 1 id: " << t1.get_id() << '\n'
              << "thread 2 id: " << t2.get_id() << '\n';

    std::swap(t1, t2);

    std::cout << "after std::swap(t1, t2):" << '\n'
              << "thread 1 id: " << t1.get_id() << '\n'
              << "thread 2 id: " << t2.get_id() << '\n';

    t1.swap(t2);

    std::cout << "after t1.swap(t2):" << '\n'
              << "thread 1 id: " << t1.get_id() << '\n'
              << "thread 2 id: " << t2.get_id() << '\n';

    
}

thread 1 id: 140185268262656
thread 2 id: 140185259869952
after std::swap(t1, t2):
thread 1 id: 140185259869952
thread 2 id: 140185268262656
after t1.swap(t2):
thread 1 id: 140185268262656
thread 2 id: 140185259869952