#### cancellation_state::cancellation_state

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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