A simple sink actor that consumes and discards input tokens.
<p>This actor is useful in situations where the value of an output is not
needed, but for some reason, the output cannot be left unconnected.
Also, when manipulating bus signals, this actor is useful if values
in the middle of the bus need to be discarded. Leaving the bus
unconnected in the middle will not work because no channel is allocated
to an unconnected relation in a bus.
Edward A. Lee, contributors: Christopher Brooks, Brian Hudson
$Id: Discard.java 70398 2014-10-22 23:44:32Z cxh $
Ptolemy II 1.0
Yellow (eal)
Yellow (ssachs)