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// promise::operator=
#include <iostream> // std::cout
#include <thread> // std::thread
#include <future> // std::promise, std::future
std::promise<int> prom;
void print_global_promise () {
std::future<int> fut = prom.get_future();
int x = fut.get();
std::cout << "value: " << x << '\n';
}
int main ()
{
std::thread th1 (print_global_promise);
prom.set_value (10);
th1.join();
prom = std::promise<int>(); // reset, by move-assigning a new promise
std::thread th2 (print_global_promise);
prom.set_value (20);
th2.join();
return 0;
}
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