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Constructor.
template<
typename ExecutionContext>
basic_waitable_timer(
ExecutionContext & context,
typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type * = 0);
This constructor creates a timer without setting an expiry time. The
expires_at() or expires_after() functions must
be called to set an expiry time before the timer can be waited on.
An execution context which provides the I/O executor that the timer will use, by default, to dispatch handlers for any asynchronous operations performed on the timer.