Helper function to obtain an object's associated cancellation_slot.

template<
    typename T>
associated_cancellation_slot< T >::type get_associated_cancellation_slot(
    const T & t);
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template<
    typename T,
    typename CancellationSlot>
auto get_associated_cancellation_slot(
    const T & t,
    const CancellationSlot & st);
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Requirements

Header: asio/associated_cancellation_slot.hpp

Convenience header: asio.hpp