cAwaitable.hpp

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#pragma once
 
// std
#include <concepts>
#include <coroutine>
 
namespace fiber
{
 
    // forward declaration
    template<class T>
    class CoroutinePromise;

    template<class Awaitable, class ResultType = void>
    concept cAwaitable = requires(Awaitable awaitable){
        { awaitable.await_ready() } -> std::convertible_to<bool>;
        { awaitable.await_resume() } -> std::same_as<ResultType>;
    } && (
        requires(Awaitable awaitable, std::coroutine_handle<CoroutinePromise<int/*any type*/>> handle){
            { awaitable.await_suspend(handle) } -> std::same_as<void>;
        }
        ||
        requires(Awaitable awaitable, std::coroutine_handle<CoroutinePromise<int/*any type*/>> handle){
            { awaitable.await_suspend(handle) } -> std::same_as<bool>;
        }
    );
 
} // namespace fiber