NAME

std::promise::set_exception_at_thread_exit - std::promise::set_exception_at_thread_exit

Synopsis

void set_exception_at_thread_exit( std::exception_ptr p ); (since C++11)

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
(therefore they need not synchronize with each other).

Parameters

p - exception pointer to store. The behavior is undefined if p is nullptr.

Return value

(none)

Exceptions

std::future_error on the following conditions:

* *this has no shared state. The error code is set to no_state.

* The shared state already stores a value or exception. The error code is set to
promise_already_satisfied.

Example