Writing multithreaded code is hard. You want to utilize all of the machine’s processing power, keep code simple and avoid data races at the same time. Let’s see how C++17 can make writing parallel code a bit easier. Intro With C++11⁄14 we’ve finally got threading into the standard library. You can now create std::thread and not just depend on third party libraries or a system API.

Let us consider a simple task: “Use a worker thread to compute a value”. In the source code it can look like that: std::thread t([]() { auto res = perform_long_computation(); }; Now, you would like to obtain the result when the computation is completed. How to do it efficiently?