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#include <iostream>

#include <thread>

#include <chrono>

void foo()

{

// simulate expensive operation

std::this_thread::sleep_for(std::chrono::seconds(1));

}

void bar()

{

// simulate expensive operation

std::this_thread::sleep_for(std::chrono::seconds(1));

}

int main()

{

std::cout << "starting first helper...\n";

std::thread helper1(foo);

std::cout << "starting second helper...\n";

std::thread helper2(bar);

std::cout << "waiting for helpers to finish..." << std::endl;

helper1.join();

helper2.join();

std::cout << "done!\n";

}