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Showing content from https://en.cppreference.com/w/cpp/language/../thread/promise/set_exception_at_thread_exit.html below:

std::promise<R>::set_exception_at_thread_exit - cppreference.com

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).

[edit] Parameters p - exception pointer to store. The behavior is undefined if p is nullptr [edit] Return value

(none)

[edit] Exceptions

std::future_error on the following conditions:

[edit] Example [edit] See also

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