Construct a disconnected cancellation state.

constexpr cancellation_state();
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Construct and attach to a parent slot to create a new child slot.

template<
    typename CancellationSlot>
explicit constexpr cancellation_state(
    CancellationSlot slot);
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template<
    typename CancellationSlot,
    typename Filter>
constexpr cancellation_state(
    CancellationSlot slot,
    Filter filter);
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template<
    typename CancellationSlot,
    typename InFilter,
    typename OutFilter>
constexpr cancellation_state(
    CancellationSlot slot,
    InFilter in_filter,
    OutFilter out_filter);
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