C++ futures part 4: What if I want an immediate on-thread std::async?

This article discusses how to implement an immediate on-thread calculation using std::async in C++. It provides several methods to achieve this, including using promises and packaged tasks.

From the article

I noted last time that you are not allowed to ask std:: async for an immediate on-thread calculation. The C++ library designers probably chose not to support it because there’s no point: An immediate on-thread calculation is just a function call, so call the function already and leave me out of it.

But maybe you want to do it because you are interfacing with a component that wants a std:: future . How could you do it?

One way would be to implement the immediately synchronous case manually by setting a value into a promise.

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