gwj / po_oopc · Files

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

std::string fun() { // normal function or the like
 return std::string ("Hello from future!");
}

int main(int argc, const char * argv[])
{
 auto f1 = std::async(std::launch::async, &fun); // starts now in a thread
 std::string str1 = f1.get(); // blocks until thread implicitly joined
 std::cout << str1 << std::endl;

 auto f2 = std::async(std::launch::deferred, &fun); // later in main thread
 std::string str2 = f2.get(); // call fun now
 std::cout << str2 << std::endl;

 return 0;
}