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    std::promise<R>::~promise

    From cppreference.net
     
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    std::promise
     
    ~promise();
    		(since C++11)

    Abandons the shared state:

    • if the shared state is ready, releases it.
    • if the shared state is not ready, stores an exception object of type std::future_error with an error condition std::future_errc::broken_promise, makes the shared state ready and releases it.