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std::execution::upon_stopped - cppreference.com

From cppreference.com

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.

Example