future/example16.cpp

// future::get
#include <iostream>       // std::cout, std::ios
#include <future>         // std::async, std::future
#include <exception>      // std::exception

int get_int() {
 std::cin.exceptions (std::ios::failbit);   // throw on failbit set
 int x;
 std::cin >> x;                             // sets failbit if invalid
 return x;
}

int main ()
{
 std::future<int> fut = std::async (get_int);
 std::cout << "Please, enter an integer value: ";

 try {
   int x = fut.get();
   std::cout << "You entered: " << x << '\n';
 }
 catch (std::exception&) {
   std::cout << "[exception caught]";
 }

 return 0;
}