somIsA - Parameters
receiver (SOMObject)
A pointer to the object
to be tested.
aClass (SOMClass)
A pointer to the class
that the object should be tested against.
rc (boolean)
Returns 1 (true) if the receiving
object is an instance of the specified class or (unlike somIsInstanceOf)
of any of its descendant classes, and 0 (false) otherwise.
[Back: somIsA Parameter - rc]
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