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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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