Don't let its name fool you. C++ coroutines is nothing about the coroutines you imagine from other languages. C++ coroutines, defined by C++20 standard is noth

Don't let its name fool you. C++ coroutines is nothing about the coroutines you imagine from other languages. C++ coroutines, defined by C++20 standard is nothing but a syntax sugar. It consists of three keywards, co_await, co_yeild and co_return. The functions which use these keywords are said to be a coroutine and it's code will be transformed such that some specific member functions of the user-defined type will be called. And that's everything. It's just a syntax sugar like range-based for. Actually, it's less than the range-based for because there is no standard library support for it. If you wrote a class that does, say, lightweight user-mode threading according to the C++ coroutine's syntax sugar expect, it become coroutine in the sense of most other programming languages. It can also support generators and other idioms if YOU or SOMEBODY wrote a library for it. Good luck with that. Because even the C++ SC's experts couldn't design and agree upon a good such standard library until the deadline of C++20. In my opinion, these features should better be implemented by powerful generic static reflections rather than a dedicated special syntax just for this.