void set_exception_at_thread_exit( std::exception_ptr p );
Stores the exception pointer
p into the shared state without making the state ready immediately. The state is made ready when the current thread exits, after all variables with thread-local storage duration have been destroyed.
The operation behaves as though set_value, set_exception, set_value_at_thread_exit, and
set_exception_at_thread_exit acquire a single mutex associated with the promise object while updating the promise object.
An exception is thrown if there is no shared state or the shared state already stores a value or exception.
|p||-||exception pointer to store|
 Return value
std::future_error on the following conditions:
- *this has no shared state. The error category is set to no_state.
- The shared state already stores a value or exception. The error category is set to promise_already_satisfied.
|This section is incomplete|
Reason: no example
 See also
| sets the result to indicate an exception |
(public member function)