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    std::execution::upon_stopped

    From cppreference.com
     
    C++
     
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    Execution Library
     
    Defined in header <experimental/execution> 
    execution::sender auto upon_stopped(
    execution::sender auto input,
    std::invocable auto function
);
    		(since C++26)

    Parameters

    input - sender which once gets "stop token", will notify the new node to execute the function
    function - invocable to be called in case a "stopped" signal is sent to the input sender

    Return value

    Returns a sender describing the task graph described by the input sender, with an added node of invoking the provided function in case the "stopped" signal is sent to the input sender.