mistake about coroutinue?

[bethebest0622]

The Warning Message is:

this function cannot be a coroutine: 'std::coroutine_traits<Promise>' has no member named 'promise_type'

here is my code:

#include <iostream>
#include <coroutine>

struct Awaiter {
  bool await_ready() {
    std::cout << "await ready or not" << std::endl;
    return true;
  }

  void await_resume() { std::cout << "await resumed" << std::endl; }

  void await_suspend(std::coroutine_handle<> h) {
    std::cout << "await suspended" << std::endl;
  }
};

struct Promise {
  struct promise_type {
    auto get_return_object() noexcept {
      std::cout << "get return object" << std::endl;
      return Promise();
    }

    auto initial_suspend() noexcept {
      std::cout << "initial suspend, return never" << std::endl;
      return std::suspend_never{};
    }

    auto final_suspend() noexcept {
      std::cout << "final suspend, return never" << std::endl;
      return std::suspend_never{};
    }

    void unhandled_exception() {
      std::cout << "unhandle exception" << std::endl;
      std::terminate();
    }

    void return_void() {
      std::cout << "return void" << std::endl;
      return;
    }
  };
};

Promise CoroutineFunc() {  // here is the warning place !!!!!!!!!!
  std::cout << "before co_await" << std::endl;
  co_await Awaiter();
  std::cout << "after co_await" << std::endl;
}

int main() {
  std::cout << "" << std::endl;
  CoroutineFunc();
  std::cout << "main() exit" << std::endl;
}

I think there is promise_type in Promise, could you help on this?

[Ben Jackson]

Please see CONTRIBUTING.md