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Destructor

Destructor[]
within a class is called for an object automatically before its definitions are dropped, when Remove[object] or ClearAll[object] are called. A class needs not to define such a parameterless Destructor method.
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Basic Examples   (1)
This loads the package.
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The next example defines a simple class hierarchy with destructor methods.
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Next, an object is created.
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On removal, destructors are automatically called from bottom to top. Apply is used here in order to evaluate obj to the actual object, because Remove does not evaluate its arguments.
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