Reset the cancellation state associated with the coroutine.
template< typename InFilter, typename OutFilter> void reset_cancellation_state( InFilter && in_filter, OutFilter && out_filter) const;
P be the cancellation
slot associated with the current coroutine's
spawn completion handler. Assigns
S, constructed as
S(P, std::forward<InFilter>(in_filter), std::forward<OutFilter>(out_filter)), into the current coroutine's cancellation