partial_cancel_after_trigger::operator()

Adapt a completion token to cancel the operation if not complete before the trigger operation completes.

template<
    typename CompletionToken>
cancel_after_trigger< decay_t< CompletionToken >, Trigger > operator()(
    CompletionToken && completion_token);
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template<
    typename CompletionToken>
cancel_after_trigger< decay_t< CompletionToken >, Trigger > operator()(
    CompletionToken && completion_token) const;
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