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| // promise example #include <iostream> // std::cout #include <functional> // std::ref #include <thread> // std::thread #include <future> // std::promise, std::future void print_int (std::future<int>& fut) { int x = fut.get(); std::cout << "value: " << x << '\n'; } int main () { std::promise<int> prom; // create promise std::future<int> fut = prom.get_future(); // engagement with future std::thread th1 (print_int, std::ref(fut)); // send future to new thread prom.set_value (10); // fulfill promise // (synchronizes with getting the future) th1.join(); return 0; }
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