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Construct and attach to a parent slot to create a new child slot.
template<
    typename CancellationSlot,
    typename InFilter,
    typename OutFilter>
constexpr cancellation_state(
    CancellationSlot slot,
    InFilter in_filter,
    OutFilter out_filter);
The parent cancellation slot to which the state will be attached.
A function object that is used to transform incoming cancellation signals as they are received from the parent slot. This function object must have the signature:
boost::asio::cancellation_type_t in_filter(
    boost::asio::cancellation_type_t);
A function object that is used to transform outcoming cancellation signals as they are relayed to the child slot. This function object must have the signature:
boost::asio::cancellation_type_t out_filter(
    boost::asio::cancellation_type_t);
The library provides the following pre-defined cancellation filters: