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On each iteration, this actor produces the token received on the previous
iteration. On the first iteration, it produces the token given by the
<i>initialValue</i> parameter, if such a value has been set.
<p>
Although it might be tempting to try, this actor is not very useful
for breaking precedences in a feedback loop in DE, the way the
TimedDelay actor in DE or the SampleDelay actor in SDF do.
Since it does not trigger until there is an input, it will not
actually break the precedences in a feedback loop.
<p>
The output data type is constrained to be at least as general
as both the input and the <i>initialValue</i> parameter.
Author(s): Edward A. Lee
Version:$Id: Previous.doc.html,v 1.1 2006/02/22 18:41:22 mangal Exp $
Pt.Proposed Rating:Red (eal)
Pt.Accepted Rating:Red (cxh)
initialValue
The initial output value. If this is set, it specifies the
first output value produced when the first input arrives.
If it is not set, then no output is produced on the first
firing.