This class is used to represent a type test that is specified either as a collection of class names (and whether to check for strict equality or inheritance) or a dynamic predicate expression that is evaluated at run-time to determine whether the test is satisfied.
We may not need this in the "new" class hierarchy. It was created
originally to be a union of character vectors,
expressions. But now that we have
DynamicTypeTest, we could perhaps use a common base class.
A virtual Class: No objects may be created from it.
No methods defined with class "ClassNameOrExpression" in the signature.
Duncan Temple Lang <[email protected]>
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