#### associated_cancellation_slot::get

If `T` has a nested type `cancellation_slot_type`, returns `t.get_cancellation_slot()`. Otherwise returns `type()`.

    static decltype(auto) get(
        const T & t);
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If `T` has a nested type `cancellation_slot_type`, returns `t.get_cancellation_slot()`. Otherwise returns `s`.

    static decltype(auto) get(
        const T & t,
        const CancellationSlot & s);
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