c++ coroutine
https://www.italiancpp.org/2016/11/02/coroutines-internals https://www.boost.org/doc/libs/1_70_0/libs/coroutine2/doc/html/index.html https://theboostcpplibraries.com/boost.coroutine https://www.netways.de/en/blog/2019/04/04/modern-c-programming-coroutines-with-boost/ https://blog.panicsoftware.com/coroutines-introduction/ https://blog.panicsoftware.com/your-first-coroutine/ https://blog.panicsoftware.com/co_awaiting-coroutines/ https://en.cppreference.com/w/cpp/language/coroutines
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