c++-coroutine

问题 Folly has a useable library for C++20 style coroutines. In the Readme it claims: IMPORTANT: You need to be very careful about the lifetimes of temporary lambda objects. Invoking a lambda coroutine returns a folly::coro::Task that captures a reference to the lambda and so if the returned Task is not immediately co_awaited then the task will be left with a dangling reference when the temporary lambda goes out of scope. I tried to make a MCVE for the example they provided, and was confused about

问题 this image comes from Practical usage of setjmp and longjmp in C. From my understanding, the coroutine is two process looks like doing parallelly for human but actually doing a single process for machine . But using setjmp & longjmp I feel very hard to read the code. If need to write the same one. For example process A & B, I will give serval States to the processes to split them into different pieces(states), do sequentially like: Process A switch (state) case A1: if (A1 is done) do B1 break