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This is an older version of Boost and was released in 2024. The current version is 1.90.0.
Adapt a completion token to specify that the completion handler should have the cancellation slot as its associated cancellation slot.
template< typename CompletionToken> constexpr cancellation_slot_binder< decay_t< CompletionToken >, CancellationSlot > operator()( CompletionToken && completion_token) const;