Class GalPort is derived from class PortHole . Class GalMultiPort is derived from class MultiPortHole . These classes are used by InterpGalaxy , and in other places, to create galaxy ports and multiports that are aliased to some port of a member block. The constructor for each of these classes takes one argument, the interior port that is to be the alias. The isItInput() and isItOutput() functions are implemented by forwarding the request to the alias.
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