attach await_ready await_suspend cast_ret_value convert_to detach forward_to forward_to future future future get get_promise has_exception has_value is_awaited is_deferred is_in_progress is_pending operator cast_ret_value operator! operator<< operator>> requires ret_value set_callback setDeferredEvaluation start startDeferredEvaluation then unset_callback wait ~future

ret_value template<typename T > using coro::future< T >::ret_value = std::conditional_t<std::is_void_v<T>, void, std::add_rvalue_reference_t<T> > type which is used as return value of get() and await_resume() Both functions returns rvalue reference for T, lvalue reference for T & and void for void If you need to retrieve lvalue reference when T is specified, then you need to store rvalue reference and convert it to lvalue, or use const T Definition at line 464 of file future.h.