#include <coroutine>
#include <future>
namespace zt{
    template<class T>
    struct Task:std::coroutine_handle<T>{
        struct promise_type;
        struct promise_type{
            std::promise<T> promise_;
            void return_value(T value){promise_.set_value(value);}
            auto initial_suspend(){
                return std::suspend_always{};
            }
            auto final_suspend()noexcept{
                return std::suspend_always{};
            }
            auto get_return_object(){
                return Task<T>::from_promise(*this);
            }
            void unhandled_exception(){
                return;
            }
        };
    };
}