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Constructor.
template< typename ExecutionContext> basic_waitable_timer( ExecutionContext & context, typename constraint< 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.