boost::asio::cancel_after
Adapt a completion_token to cancel an operation if not complete before the specified relative timeout has elapsed.
Synopsis
Declared in <boost/asio/cancel_after.hpp>
template<
typename Rep,
typename Period,
typename CompletionToken>
[[nodiscard]]
cancel_after_t<decay_t<CompletionToken>, std::chrono::steady_clock>
cancel_after(
chrono::duration<Rep, Period> const& timeout,
CompletionToken&& completion_token);Thread Safety
When an asynchronous operation is used with cancel_after, a timer async_wait operation is performed in parallel to the main operation. If this parallel async_wait completes first, a cancellation request is emitted to cancel the main operation. Consequently, the application must ensure that the asynchronous operation is performed within an implicit or explicit strand.
Return Value
A completion_token adapter that cancels an operation after a timeout.
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