C++11 high level thread interface using async() and future<>

cpp11_thread_async_future.cpp

#include <future>
#include <iostream>

void print2Screen(char c)
{

   for(int i = 0; i < 50; i++)
   {
      std::cout.put(c).flush();
      _sleep(100); //sleep 100 millisec
   }
}

void func1()
{
   return print2Screen('+');
}


void func2()
{
   return print2Screen('-');
}

int main() 
{
   std::cout << "Start func1() in background "
            << "while func2() in foreground" << std::endl;

   //call func1 asynchronously and store the result to future object
   std::future<void> task1(std::async(func1)); 
     
   func2(); //Call func2() synchronously (here and now)

   
   //To force execution of func1(), we call get() for the returned future.
   task1.get();
   
   std::cout << "\n\nDone with C++11 high level threading model" << std::endl;
}