Pavel Novikov: "Coroutines + Type Erasure = State Machine"

C++ coroutines are de facto state machines. Add a bit of type erasure and metaprogramming magic, and you get a cute looking state machine.
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This presentation was given at the June 2020 edition of C++ London: www.meetup.com/CppLondon/even...

[@think2086]

Maybe change `shout("Come in, it's open!");` to `shout("Come in, it's unlocked.");`
Right now, it's confusing haha. The state is CLOSED, not open. The door isn't open. It's unlocked.