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Coding Standards
Helper function to obtain an object's associated cancellation_slot.
template<
typename T,
typename CancellationSlot>
associated_cancellation_slot< T, CancellationSlot >::type get_associated_cancellation_slot(
const T & t,
const CancellationSlot & st);
associated_cancellation_slot<T, CancellationSlot>get(t, st)