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This is an older version of Boost and was released in 2023. The current version is 1.89.0.
Helper function to obtain an object's associated cancellation_slot.
template< typename T, typename CancellationSlot> auto get_associated_cancellation_slot( const T & t, const CancellationSlot & st);
associated_cancellation_slot<T, CancellationSlot>get(t,
st)