Boost C++ Libraries

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basic_deadline_timer::cancel (1 of 2 overloads)

Cancel any asynchronous operations that are waiting on the timer.

std::size_t cancel();

This function forces the completion of any pending asynchronous wait operations against the timer. The handler for each cancelled operation will be invoked with the boost::asio::error::operation_aborted error code.

Cancelling the timer does not change the expiry time.

Return Value

The number of asynchronous operations that were cancelled.

Exceptions

boost::system::system_error

Thrown on failure.

Remarks

If the timer has already expired when cancel() is called, then the handlers for asynchronous wait operations will:

These handlers can no longer be cancelled, and therefore are passed an error code that indicates the successful completion of the wait operation.


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