gwj / po_oopc · Files

#include <iostream>
#include <string>
#include <thread>
#include <future>


std::string fun() { // normal function
 std::this_thread::sleep_for (std::chrono::seconds(5));
 return std::string ("Hello from future!");
}

int main(int argc, const char * argv[])
{
 std::future<std::string> fut = std::async(&fun); // asyncronously: starts now or later
 std::this_thread::sleep_for (std::chrono::seconds(4));
 std::cout << "Wait for result" << std::endl;
 std::string str = fut.get(); // but will be finished here
 std::cout << str << std::endl;

 return 0;
}