How do you implement Coroutines in C++

Question

I doubt it can be done portably, but are there any solutions out there? I think it could be done by creating an alternate stack and reseting SP,BP, and IP on function entry

Answer 1

https://github.com/tonbit/coroutine is C++11 single .h asymmetric coroutine implementation supporting resume/yield/await primitives and Channel model. It's implementing via ucontext / fiber, not depending on boost, running on linux/windows/macOS. It's a good starting point to learn implementing coroutine in c++.