chat1.cpp

Chat Fun()  // #A Wrapper type Chat containing the promise type
{
  co_yield "Olá!\n"s;  // #B Calls promise_type.yield_value

  std::cout << co_await std::string{};  // #C Calls promise_type.await_transform

  co_return "Aqui!\n"s;  // #D Calls promise_type.return_value
}

int main()
{
  Chat chat = Fun();  // #E Creation of the coroutine

  std::cout << chat.listen();  // #F Trigger the machine

  chat.answer("Onde você está?\n"s);  // #G Send data into the coroutine

  std::cout << chat.listen();  // #H Wait for more data from the coroutine
}