std::promise<R>::set_exception_at_thread_exit

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.

Calls to this function do not introduce data races with calls to get_future (but they need not synchronize with each other).

Parameters

Return value

(none).

Exceptions

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.

Example

See also